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polyelectrolyte</title> <meta name="description" content="Search results for: polyelectrolyte"> <meta name="keywords" content="polyelectrolyte"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none 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action="https://publications.waset.org/abstracts/search"> <div id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="polyelectrolyte"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 32</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: polyelectrolyte</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">32</span> Rheological Behavior of Fresh Activated Sludge</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Salam%20K.%20Al-Dawery">Salam K. Al-Dawery</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Despite of few research works on municipal sludge, still there is a lack of actual data. Thus, this work was focused on the conditioning and rheology of fresh activated sludge. The effect of cationic polyelectrolyte has been investigated at different concentrations and pH values in a comparative fashion. Yield stress is presented in all results indicating the minimum stress that necessary to reach flow conditions. Connections between particle-particle is the reason for this yield stress, also, the addition of polyelectrolyte causes strong bonds between particles and water resulting in the aggregation of particles which required higher shear stress in order to flow. The results from the experiments indicate that the cationic polyelectrolytes have significant effluence on the sludge characteristic and water quality such as turbidity, SVI, zone settling rate and shear stress. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=rheology" title="rheology">rheology</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte" title=" polyelectrolyte"> polyelectrolyte</a>, <a href="https://publications.waset.org/abstracts/search?q=settling%20volume%20index" title=" settling volume index"> settling volume index</a>, <a href="https://publications.waset.org/abstracts/search?q=turbidity" title=" turbidity"> turbidity</a> </p> <a href="https://publications.waset.org/abstracts/9218/rheological-behavior-of-fresh-activated-sludge" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/9218.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">357</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">31</span> Preparation and Characterization of Cellulose Based Antimicrobial Food Packaging Materials</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Memet%20Vezir%20Kahraman">Memet Vezir Kahraman</a>, <a href="https://publications.waset.org/abstracts/search?q=Ferhat%20Sen"> Ferhat Sen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study aimed to develop polyelectrolyte structured antimicrobial food packaging materials that do not contain any antimicrobial agents. Cationic hydroxyethyl cellulose was synthesized and characterized by Fourier Transform Infrared, carbon and proton Nuclear Magnetic Resonance spectroscopy. Its nitrogen content was determined by the Kjeldahl method. Polyelectrolyte structured antimicrobial food packaging materials were prepared using hydroxyethyl cellulose, cationic hydroxyethyl cellulose, and sodium alginate. Antimicrobial activity of materials was defined by inhibition zone method (disc diffusion method). Thermal stability of samples was evaluated by thermal gravimetric analysis and differential scanning calorimetry. Surface morphology of samples was investigated by scanning electron microscope. The obtained results prove that produced food packaging materials have good thermal and antimicrobial properties, and they can be used as food packaging material in many industries. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=antimicrobial%20food%20packaging" title="antimicrobial food packaging">antimicrobial food packaging</a>, <a href="https://publications.waset.org/abstracts/search?q=cationic%20hydroxyethyl%20cellulose" title=" cationic hydroxyethyl cellulose"> cationic hydroxyethyl cellulose</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte" title=" polyelectrolyte"> polyelectrolyte</a>, <a href="https://publications.waset.org/abstracts/search?q=sodium%20alginate" title=" sodium alginate"> sodium alginate</a> </p> <a href="https://publications.waset.org/abstracts/93166/preparation-and-characterization-of-cellulose-based-antimicrobial-food-packaging-materials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/93166.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">160</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">30</span> Adsorption-desorption Behavior of Weak Polyelectrolytes Deposition on Aminolyzed-PLA Non-woven</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sima%20Shakoorjavan">Sima Shakoorjavan</a>, <a href="https://publications.waset.org/abstracts/search?q=Dawid%20Stawski"> Dawid Stawski</a>, <a href="https://publications.waset.org/abstracts/search?q=Somaye%20Akbari"> Somaye Akbari</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, the adsorption-desorption behavior of poly(amidoamine) (PAMAM) as a polycation and poly (acrylic acid) (PAA) as a polyanion deposited on aminolyzed-PLA nonwoven through layer-by-layer technique (lbl) was studied. The adsorption-desorption behavior was monitored by UV adsorbance spectroscopy and turbidity tests of the waste polyelectrolytes after each deposition. Also, the drying between each deposition step was performed to study the effect of drying on adsorption-desorption behavior. According to UV adsorbance spectroscopy of the waste polyelectrolyte after each deposition, it was revealed that drying has a great effect on the deposition behavior of the next layer. Regarding the deposition of the second layer, drying caused more desorption and removal of the previously deposited layer since the turbidity and the absorbance of the waste increased in comparison to pure polyelectrolyte. To deposit the third layer, the same scenario occurred and drying caused more removal of the previously deposited layer. However, the deposition of the fourth layer drying after the deposition of the third layer did not affect the adsorption-desorption behavior. Since the adsorbance and turbidity of the samples that were dried and those that were not dried were the same. As a result, it seemed that deposition of the fourth layer could be the starting point where lbl reached its constant state. The decrease in adsorbance and remaining turbidity of the waste same as a pure polyelectrolyte can indicate that most portion of the polyelectrolyte was adsorbed onto the substrate rather than complex formation in the bath as the subsequence of the previous layer removal. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Adsorption-desorption%20behavior" title="Adsorption-desorption behavior">Adsorption-desorption behavior</a>, <a href="https://publications.waset.org/abstracts/search?q=lbl%20technique" title=" lbl technique"> lbl technique</a>, <a href="https://publications.waset.org/abstracts/search?q=poly%28amidoamine%29" title=" poly(amidoamine)"> poly(amidoamine)</a>, <a href="https://publications.waset.org/abstracts/search?q=poly%20%28acrylic%20acid%29" title=" poly (acrylic acid)"> poly (acrylic acid)</a>, <a href="https://publications.waset.org/abstracts/search?q=weak%20polyelectrolytes" title=" weak polyelectrolytes"> weak polyelectrolytes</a> </p> <a href="https://publications.waset.org/abstracts/176722/adsorption-desorption-behavior-of-weak-polyelectrolytes-deposition-on-aminolyzed-pla-non-woven" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/176722.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">53</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">29</span> Removal of Pharmaceuticals from Aquarius Solutions Using Hybrid Ceramic Membranes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jenny%20Radeva">Jenny Radeva</a>, <a href="https://publications.waset.org/abstracts/search?q=Anke-Gundula%20Roth"> Anke-Gundula Roth</a>, <a href="https://publications.waset.org/abstracts/search?q=Christian%20Goebbert"> Christian Goebbert</a>, <a href="https://publications.waset.org/abstracts/search?q=Robert%20Niestroj-Pahl"> Robert Niestroj-Pahl</a>, <a href="https://publications.waset.org/abstracts/search?q=Lars%20Daehne"> Lars Daehne</a>, <a href="https://publications.waset.org/abstracts/search?q=Axel%20Wolfram"> Axel Wolfram</a>, <a href="https://publications.waset.org/abstracts/search?q=Juergen%20Wiese"> Juergen Wiese</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The technological advantages of ceramic filtration elements were combined with polyelectrolyte films in the development process of hybrid membrane for the elimination of pharmaceuticals from Aquarius solutions. Previously extruded alumina ceramic membranes were coated with nanosized polyelectrolyte films using Layer-by-Layer technology. The polyelectrolyte chains form a network with nano-pores on the ceramic surface and promote the retention of small molecules like pharmaceuticals and microplastics, which cannot be eliminated using standard ultrafiltration methods. Additionally, the polyelectrolyte coat contributes with its adjustable (based on application) Zeta Potential for repulsion of contaminant molecules with opposite charges. Properties like permeability, bubble point, pore size distribution and Zeta Potential of ceramic and hybrid membranes were characterized using various laboratory and pilot tests and compared with each other. The most significant role for the membrane characterization played the filtration behavior investigation, during which retention against widely used pharmaceuticals like Diclofenac, Ibuprofen and Sulfamethoxazol was subjected to series of filtration tests. The presented study offers a new perspective on nanosized molecules removal from aqueous solutions and shows the importance of combined techniques application for the elimination of pharmaceutical contaminants from drinking water. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=water%20treatment" title="water treatment">water treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=hybrid%20membranes" title=" hybrid membranes"> hybrid membranes</a>, <a href="https://publications.waset.org/abstracts/search?q=layer-by-layer%20coating" title=" layer-by-layer coating"> layer-by-layer coating</a>, <a href="https://publications.waset.org/abstracts/search?q=filtration" title=" filtration"> filtration</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolytes" title=" polyelectrolytes"> polyelectrolytes</a> </p> <a href="https://publications.waset.org/abstracts/138646/removal-of-pharmaceuticals-from-aquarius-solutions-using-hybrid-ceramic-membranes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/138646.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">167</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">28</span> Coating of Polyelectrolyte Multilayer Thin Films on Poly(S/EGDMA) HIPE Loaded with Hydroxyapatite as a Scaffold for Tissue Engineering Application</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kornkanok%20Noulta">Kornkanok Noulta</a>, <a href="https://publications.waset.org/abstracts/search?q=Pornsri%20Pakeyangkoon"> Pornsri Pakeyangkoon</a>, <a href="https://publications.waset.org/abstracts/search?q=Stephen%20T.%20Dubas"> Stephen T. Dubas</a>, <a href="https://publications.waset.org/abstracts/search?q=Pomthong%20Malakul"> Pomthong Malakul</a>, <a href="https://publications.waset.org/abstracts/search?q=Manit%20Nithithanakul"> Manit Nithithanakul</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In recent years, interest in the development of material for tissue engineering application has increased considerably. Poly(High Internal Phase Emulsion) (PolyHIPE) foam is a material that is good candidate for used in tissue engineering application due to its 3D structure and highly porous with interconnected pore. The PolyHIPE was prepared from poly (styrene/ethylene glycol dimethacrylate) through high internal phase emulsion polymerization technique and loaded with hydroxyapatite (HA) to improve biocompatibility. To further increase hydrophilicity of the obtained polyHIPE, layer-by-layer polyelectrolyte multilayers (PEM) technique was used. A surface property of polyHIPE was characterized by contact angle measurement. Morphology and pore size was observed by scanning electron microscope (SEM). The cell viability was revealed by the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay technique. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte%20multilayer%20thin%20film" title="polyelectrolyte multilayer thin film">polyelectrolyte multilayer thin film</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20internal%20phase%20emulsion" title=" high internal phase emulsion"> high internal phase emulsion</a>, <a href="https://publications.waset.org/abstracts/search?q=polyhipe%20foam" title=" polyhipe foam"> polyhipe foam</a>, <a href="https://publications.waset.org/abstracts/search?q=scaffold" title=" scaffold"> scaffold</a>, <a href="https://publications.waset.org/abstracts/search?q=tissue%20engineering" title=" tissue engineering"> tissue engineering</a> </p> <a href="https://publications.waset.org/abstracts/2179/coating-of-polyelectrolyte-multilayer-thin-films-on-polysegdma-hipe-loaded-with-hydroxyapatite-as-a-scaffold-for-tissue-engineering-application" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2179.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">351</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">27</span> Nanofiltration Membranes with Deposyted Polyelectrolytes: Caracterisation and Antifouling Potential</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Viktor%20Kochkodan">Viktor Kochkodan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The main problem arising upon water treatment and desalination using pressure driven membrane processes such as microfiltration, ultrafiltration, nanofiltration and reverse osmosis is membrane fouling that seriously hampers the application of the membrane technologies. One of the main approaches to mitigate membrane fouling is to minimize adhesion interactions between a foulant and a membrane and the surface coating of the membranes with polyelectrolytes seems to be a simple and flexible technique to improve the membrane fouling resistance. In this study composite polyamide membranes NF-90, NF-270, and BW-30 were modified using electrostatic deposition of polyelectrolyte multilayers made from various polycationic and polyanionic polymers of different molecular weights. Different anionic polyelectrolytes such as: poly(sodium 4-styrene sulfonate), poly(vinyl sulfonic acid, sodium salt), poly(4-styrene sulfonic acid-co-maleic acid) sodium salt, poly(acrylic acid) sodium salt (PA) and cationic polyelectrolytes such as poly(diallyldimethylammonium chloride), poly(ethylenimine) and poly(hexamethylene biguanide were used for membrane modification. An effect of deposition time and a number of polyelectrolyte layers on the membrane modification has been evaluated. It was found that degree of membrane modification depends on chemical nature and molecular weight of polyelectrolytes used. The surface morphology of the prepared composite membranes was studied using atomic force microscopy. It was shown that the surface membrane roughness decreases significantly as a number of the polyelectrolyte layers on the membrane surface increases. This smoothening of the membrane surface might contribute to the reduction of membrane fouling as lower roughness most often associated with a decrease in surface fouling. Zeta potentials and water contact angles on the membrane surface before and after modification have also been evaluated to provide addition information regarding membrane fouling issues. It was shown that the surface charge of the membranes modified with polyelectrolytes could be switched between positive and negative after coating with a cationic or an anionic polyelectrolyte. On the other hand, the water contact angle was strongly affected when the outermost polyelectrolyte layer was changed. Finally, a distinct difference in the performance of the noncoated membranes and the polyelectrolyte modified membranes was found during treatment of seawater in the non-continuous regime. A possible mechanism of the higher fouling resistance of the modified membranes has been discussed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=contact%20angle" title="contact angle">contact angle</a>, <a href="https://publications.waset.org/abstracts/search?q=membrane%20fouling" title=" membrane fouling"> membrane fouling</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolytes" title=" polyelectrolytes"> polyelectrolytes</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20modification" title=" surface modification"> surface modification</a> </p> <a href="https://publications.waset.org/abstracts/71307/nanofiltration-membranes-with-deposyted-polyelectrolytes-caracterisation-and-antifouling-potential" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/71307.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">251</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">26</span> Treatment of Rice Industry Waste Water by Flotation-Flocculation Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=J.%20K.%20Kapoor">J. K. Kapoor</a>, <a href="https://publications.waset.org/abstracts/search?q=Shagufta%20Jabin"> Shagufta Jabin</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20S.%20Bhatia"> H. S. Bhatia </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polyamine flocculants were synthesized by poly-condensation of diphenylamine and epichlorohydrin using 1, 2-diaminoethane as modifying agent. The polyelectrolytes were prepared by taking epichlohydrin-diphenylamine in a molar ratio of 1:1, 1.5:1, 2:1, and 2.5:1. The flocculation performance of these polyelectrolytes was evaluated with rice industry waste water. The polyelectrolytes have been used in conjunction with alum for coagulation- flocculation process. Prior to the coagulation- flocculation process, air flotation technique was used with the aim to remove oil and grease content from waste water. Significant improvement was observed in the removal of oil and grease content after the air flotation technique. It has been able to remove 91.7% oil and grease from rice industry waste water. After coagulation-flocculation method, it has been observed that polyelectrolyte with epichlohydrin-diphenylamine molar ratio of 1.5:1 showed best results for the removal of pollutants from rice industry waste water. The highest efficiency of turbidity and TSS removal with polyelectrolyte has been found to be 97.5% and 98.2%, respectively. Results of these evaluations also reveal 86.8% removal of COD and 87.5% removal of BOD from rice industry waste water. Thus, we demonstrate optimization of coagulation–flocculation technique which is appropriate for waste water treatment. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=coagulation" title="coagulation">coagulation</a>, <a href="https://publications.waset.org/abstracts/search?q=flocculation" title=" flocculation"> flocculation</a>, <a href="https://publications.waset.org/abstracts/search?q=air%20flotation%20technique" title=" air flotation technique"> air flotation technique</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte" title=" polyelectrolyte"> polyelectrolyte</a>, <a href="https://publications.waset.org/abstracts/search?q=turbidity" title=" turbidity "> turbidity </a> </p> <a href="https://publications.waset.org/abstracts/16797/treatment-of-rice-industry-waste-water-by-flotation-flocculation-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/16797.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">480</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">25</span> Effect of Swelling Pressure on Drug Release from Polyelectrolyte Micro-Hydrogel Particles</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mina%20Boroujerdi">Mina Boroujerdi</a>, <a href="https://publications.waset.org/abstracts/search?q=Javad%20Tavakoli"> Javad Tavakoli</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Hydrogels are extensively studied as matrices for the controlled release of drugs. To evaluate the mobility of embedded molecules, these drug delivery systems are usually characterized by release studies. In this contribution, an electronic device for swelling pressure measurement during drug release from hydrogel network was developed. Also, poly acrylic acid micro particles were prepared for prolonged and sustained controlled acetaminophen release. Effect of swelling pressure on drug release from micro particles studied under different environment pH in order to predict release profile in gastro-intestine medium. Swelling ratio and swelling pressure were measured in different pH. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=swelling%20pressure" title="swelling pressure">swelling pressure</a>, <a href="https://publications.waset.org/abstracts/search?q=drug%20delivery" title=" drug delivery"> drug delivery</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrogel" title=" hydrogel"> hydrogel</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte" title=" polyelectrolyte"> polyelectrolyte</a> </p> <a href="https://publications.waset.org/abstracts/54759/effect-of-swelling-pressure-on-drug-release-from-polyelectrolyte-micro-hydrogel-particles" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/54759.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">299</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">24</span> Influence of Layer-by-Layer Coating Parameters on the Properties of Hybrid Membrane for Water Treatment</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jenny%20Radeva">Jenny Radeva</a>, <a href="https://publications.waset.org/abstracts/search?q=Anke-Gundula%20Roth"> Anke-Gundula Roth</a>, <a href="https://publications.waset.org/abstracts/search?q=Christian%20Goebbert"> Christian Goebbert</a>, <a href="https://publications.waset.org/abstracts/search?q=Robert%20Niestroj-Pahl"> Robert Niestroj-Pahl</a>, <a href="https://publications.waset.org/abstracts/search?q=Lars%20Daehne"> Lars Daehne</a>, <a href="https://publications.waset.org/abstracts/search?q=Axel%20Wolfram"> Axel Wolfram</a>, <a href="https://publications.waset.org/abstracts/search?q=Juergen%20WIese"> Juergen WIese</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The presented investigation studies the correlation between the process parameters of Layer-by-Layer (LbL) coatings and properties of the produced hybrid membranes for water treatment. The coating of alumina ceramic support membrane with polyelectrolyte multilayers on top results in hybrid membranes with increased fouling resistant behavior, high retention (up to 90%) of salt ions and various pharmaceuticals, selectivity to various organic molecules as known from LbL coated polyether sulfone membranes and the possibility of pH response control. Chosen polyelectrolytes were added to the support using the LbL-coating process. Parameters like the type of polyelectrolyte, ionic strength, and pH were varied in order to find the most suitable process conditions and to study how they influence the properties of the final product. The applied LbL-films was investigated in respect to its homogeneity and penetration depth. The analysis of the layer buildup was performed using fluorescence labeled polyelectrolyte molecules and Confocal Laser Scanning Microscopy as well as Scanning and Transmission Electron Microscopy. Furthermore, the influence of the coating parameters on the porosity, surface potential, retention, and permeability of the developed hybrid membranes were estimated. In conclusion, a comparison was drawn between the filtration performance of the uncoated alumina ceramic membrane and modified hybrid membranes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=water%20treatment" title="water treatment">water treatment</a>, <a href="https://publications.waset.org/abstracts/search?q=membranes" title=" membranes"> membranes</a>, <a href="https://publications.waset.org/abstracts/search?q=ceramic%20membranes" title=" ceramic membranes"> ceramic membranes</a>, <a href="https://publications.waset.org/abstracts/search?q=hybrid%20membranes" title=" hybrid membranes"> hybrid membranes</a>, <a href="https://publications.waset.org/abstracts/search?q=layer-by-layer%20modification" title=" layer-by-layer modification"> layer-by-layer modification</a> </p> <a href="https://publications.waset.org/abstracts/138613/influence-of-layer-by-layer-coating-parameters-on-the-properties-of-hybrid-membrane-for-water-treatment" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/138613.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">180</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">23</span> Effect of Polymer Concentration on the Rheological Properties of Polyelectrolyte Solutions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Khaled%20Benyounes">Khaled Benyounes</a>, <a href="https://publications.waset.org/abstracts/search?q=Abderrahmane%20Mellak"> Abderrahmane Mellak</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The rheology of aqueous solutions of polyelectrolyte (polyanionic cellulose, PAC) at high molecular weight was investigated using a controlled stress rheometer. Several rheological measurements; viscosity measurements, creep compliance tests at a constant low shear stress and oscillation experiments have been performed. The concentrations ranged by weight from 0.01 to 2.5% of PAC. It was found that the aqueous solutions of PAC do not exhibit a yield stress, the flow curves of PAC over a wide range of shear rate (0 to 1000 s-1) could be described by the cross model and the Williamson models. The critical concentrations of polymer c* and c** have been estimated. The dynamic moduli, i.e., storage modulus (G’) and loss modulus (G’’) of the polymer have been determined at frequency sweep from 0.01 to 10 Hz. At polymer concentration above 1%, the modulus G’ is superior to G’’. The relationships between the dynamic modulus and concentration of polymer have been established. The creep-recovery experiments demonstrated that polymer solutions show important viscoelastic properties of system water-PAC when the concentration of the polymer increases. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=polyanionic%20cellulose" title="polyanionic cellulose">polyanionic cellulose</a>, <a href="https://publications.waset.org/abstracts/search?q=viscosity" title=" viscosity"> viscosity</a>, <a href="https://publications.waset.org/abstracts/search?q=creep" title=" creep"> creep</a>, <a href="https://publications.waset.org/abstracts/search?q=oscillation" title=" oscillation"> oscillation</a>, <a href="https://publications.waset.org/abstracts/search?q=cross%20model" title=" cross model"> cross model</a> </p> <a href="https://publications.waset.org/abstracts/6588/effect-of-polymer-concentration-on-the-rheological-properties-of-polyelectrolyte-solutions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6588.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">326</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">22</span> Evaluation of Coagulation Efficiency of Protein Extracts from Lupinus Albus L., Moringa Stenopetala Cufod., Trigonella Foenum-Graecum L. And Vicia Faba L. For Water Purification</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Neway%20Adele">Neway Adele</a>, <a href="https://publications.waset.org/abstracts/search?q=Adey%20Feleke"> Adey Feleke</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Access to clean drinking water is a basic human right. However, an estimated 1.2 billion people across the world consume unclean water daily. Interest has been growing in natural coagulants as the health and environmental concerns of conventional chemical coagulants are rising. Natural coagulants have the potential to serve as alternative water treatment agents. In this study, Lupinus albus, Moringa stenopetala, Trigonella foenum-graecum and Vicia faba protein extracts were evaluated as natural coagulants for water treatment. The protein extracts were purified from crude extracts using a protein purifier, and protein concentrations were determined by the spectrophotometric method. Small-volume coagulation efficiency tests were conducted on raw water taken from the Legedadi water treatment plant. These were done using a completely randomized design (CRD) experiment with settling times of 0 min (initial time), 90 min, 180 min and 270 min and protein extract doses of 5 mg/L, 10 mg/L, 15 mg/L and 20 mg/L. Raw water as negative control and polyelectrolyte as positive control were also included. The optical density (OD) values were measured for all the samples. At 270 min and 20 mg/L, the coagulation efficiency percentages for Lupinus albus, Moringa stenopetala, Trigonella foenum-graecum and Vicia faba protein extracts were 71%, 89%, 12% and 67% in the water sample collected in April 2019 respectively. Similarly, Lupinus albus, Moringa stenopetala and Vicia faba achieved 17%, 92% and 12% at 270 min settling times and 5 mg/L, 20 mg/L and 10 mg/L concentration in the water sample collected from August 2019, respectively. Negative control (raw water) and polyelectrolyte (positive control) were also 6 − 10% and 89 − 94% at 270 min settling time in April and August 2019, respectively. Among the four protein extracts, Moringa stenopetala showed the highest coagulation efficiency, similar to polyelectrolyte. This study concluded that Moringa stenopetala protein extract could be used as a natural coagulant for water purification in both sampling times. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=coagulation%20efficiency" title="coagulation efficiency">coagulation efficiency</a>, <a href="https://publications.waset.org/abstracts/search?q=extraction" title=" extraction"> extraction</a>, <a href="https://publications.waset.org/abstracts/search?q=natural%20coagulant" title=" natural coagulant"> natural coagulant</a>, <a href="https://publications.waset.org/abstracts/search?q=protein%20extract" title=" protein extract"> protein extract</a> </p> <a href="https://publications.waset.org/abstracts/169808/evaluation-of-coagulation-efficiency-of-protein-extracts-from-lupinus-albus-l-moringa-stenopetala-cufod-trigonella-foenum-graecum-l-and-vicia-faba-l-for-water-purification" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/169808.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">68</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">21</span> A Numerical Study on Electrophoresis of a Soft Particle with Charged Core Coated with Polyelectrolyte Layer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Partha%20Sarathi%20Majee">Partha Sarathi Majee</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bhattacharyya"> S. Bhattacharyya</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Migration of a core-shell soft particle under the influence of an external electric field in an electrolyte solution is studied numerically. The soft particle is coated with a positively charged polyelectrolyte layer (PEL) and the rigid core is having a uniform surface charge density. The Darcy-Brinkman extended Navier-Stokes equations are solved for the motion of the ionized fluid, the non-linear Nernst-Planck equations for the ion transport and the Poisson equation for the electric potential. A pressure correction based iterative algorithm is adopted for numerical computations. The effects of convection on double layer polarization (DLP) and diffusion dominated counter ions penetration are investigated for a wide range of Debye layer thickness, PEL fixed surface charge density, and permeability of the PEL. Our results show that when the Debye layer is in order of the particle size, the DLP effect is significant and produces a reduction in electrophoretic mobility. However, the double layer polarization effect is negligible for a thin Debye layer or low permeable cases. The point of zero mobility and the existence of mobility reversal depending on the electrolyte concentration are also presented. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=debye%20length" title="debye length">debye length</a>, <a href="https://publications.waset.org/abstracts/search?q=double%20layer%20polarization" title=" double layer polarization"> double layer polarization</a>, <a href="https://publications.waset.org/abstracts/search?q=electrophoresis" title=" electrophoresis"> electrophoresis</a>, <a href="https://publications.waset.org/abstracts/search?q=mobility%20reversal" title=" mobility reversal"> mobility reversal</a>, <a href="https://publications.waset.org/abstracts/search?q=soft%20particle" title=" soft particle"> soft particle</a> </p> <a href="https://publications.waset.org/abstracts/63343/a-numerical-study-on-electrophoresis-of-a-soft-particle-with-charged-core-coated-with-polyelectrolyte-layer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/63343.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">345</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20</span> Construction and Cross-Linking of Polyelectrolyte Multilayers Based on Polysaccharides as Antifouling Coatings</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Wenfa%20Yu">Wenfa Yu</a>, <a href="https://publications.waset.org/abstracts/search?q=Thuva%20Gnanasampanthan"> Thuva Gnanasampanthan</a>, <a href="https://publications.waset.org/abstracts/search?q=John%20Finlay"> John Finlay</a>, <a href="https://publications.waset.org/abstracts/search?q=Jessica%20Clarke"> Jessica Clarke</a>, <a href="https://publications.waset.org/abstracts/search?q=Charlotte%20Anderson"> Charlotte Anderson</a>, <a href="https://publications.waset.org/abstracts/search?q=Tony%20Clare"> Tony Clare</a>, <a href="https://publications.waset.org/abstracts/search?q=Axel%20Rosenhahn"> Axel Rosenhahn</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Marine biofouling is a worldwide problem at vast economic and ecological costs. Historically it was combated with toxic coatings such as tributyltin. As those coatings being banned nowadays, finding environmental friendly antifouling solution has become an urgent topic. In this study antifouling coatings consisted of natural occurring polysaccharides hyaluronic acid (HA), alginic acid (AA), chitosan (Ch) and polyelectrolyte polyethylenimine (PEI) are constructed into polyelectrolyte multilayers (PEMs) in a Layer-by-Layer (LbL) method. LbL PEM construction is a straightforward way to assemble biomacromolecular coatings on surfaces. Advantages about PEM include ease of handling, highly diverse PEM composition, precise control over the thickness and so on. PEMs have been widely employed in medical application and there are numerous studies regarding their protein adsorption, elasticity and cell adhesive properties. With the adjustment of coating composition, termination layer charge, coating morphology and cross-linking method, it is possible to prepare low marine biofouling coatings with PEMs. In this study, using spin coating technology, PEM construction was achieved at smooth multilayers with roughness as low as 2nm rms and highly reproducible thickness around 50nm. To obtain stability in sea water, the multilayers were covalently cross-linked either thermally or chemically. The cross-linking method affected surface energy, which was reflected in water contact angle, thermal cross-linking led to hydrophobic surfaces and chemical cross-linking generated hydrophilic surfaces. The coatings were then evaluated regarding its protein resistance and biological species resistance. While the hydrophobic thermally cross-linked PEM had low resistance towards proteins, the resistance of chemically cross-linked PEM strongly depended on the PEM termination layer and the charge of the protein, opposite charge caused high adsorption and same charge low adsorption, indicating electrostatic interaction plays a crucial role in the protein adsorption processes. Ulva linza was chosen as the biological species for antifouling performance evaluation. Despite of the poor resistance towards protein adsorption, thermally cross-linked PEM showed good resistance against Ulva spores settlement, the chemically cross-linked multilayers showed poor resistance regardless of the termination layer. Marine species adhesion is a complex process, although it involves proteins as bioadhesives, protein resistance its own is not a fully indicator for its antifouling performance. The species will pre select the surface, responding to cues like surface energy, chemistry, or charge and so on. Thus making it difficult for one single factors to determine its antifouling performance. Preparing PEM coating is a comprehensive work involving choosing polyelectrolyte combination, determining termination layer and the method for cross-linking. These decisions will affect PEM properties such as surface energy, charge, which is crucial, since biofouling is a process responding to surface properties in a highly sensitive and dynamic way. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hyaluronic%20acid" title="hyaluronic acid">hyaluronic acid</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte%20multilayers" title=" polyelectrolyte multilayers"> polyelectrolyte multilayers</a>, <a href="https://publications.waset.org/abstracts/search?q=protein%20resistance" title=" protein resistance"> protein resistance</a>, <a href="https://publications.waset.org/abstracts/search?q=Ulva%20linza%20zoospores" title=" Ulva linza zoospores"> Ulva linza zoospores</a> </p> <a href="https://publications.waset.org/abstracts/105303/construction-and-cross-linking-of-polyelectrolyte-multilayers-based-on-polysaccharides-as-antifouling-coatings" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/105303.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">165</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">19</span> Tailorability of Poly(Aspartic Acid)/BSA Complex by Self-Assembling in Aqueous Solutions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Loredana%20E.%20Nita">Loredana E. Nita</a>, <a href="https://publications.waset.org/abstracts/search?q=Aurica%20P.%20Chiriac"> Aurica P. Chiriac</a>, <a href="https://publications.waset.org/abstracts/search?q=Elena%20Stoleru"> Elena Stoleru</a>, <a href="https://publications.waset.org/abstracts/search?q=Alina%20Diaconu"> Alina Diaconu</a>, <a href="https://publications.waset.org/abstracts/search?q=Tudorachi%20Nita"> Tudorachi Nita</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Self-assembly processes are an attractive method to form new and complex structures between macromolecular compounds to be used for specific applications. In this context, intramolecular and intermolecular bonds play a key role during self-assembling processes in preparation of carrier systems of bioactive substances. Polyelectrolyte complexes (PECs) are formed through electrostatic interactions, and though they are significantly below of the covalent linkages in their strength, these complexes are sufficiently stable owing to the association processes. The relative ease way of PECs formation makes from them a versatile tool for preparation of various materials, with properties that can be tuned by adjusting several parameters, such as the chemical composition and structure of polyelectrolytes, pH and ionic strength of solutions, temperature and post-treatment procedures. For example, protein-polyelectrolyte complexes (PPCs) are playing an important role in various chemical and biological processes, such as protein separation, enzyme stabilization and polymer drug delivery systems. The present investigation is focused on evaluation of the PPC formation between a synthetic polypeptide (poly(aspartic acid) – PAS) and a natural protein (bovine serum albumin - BSA). The PPC obtained from PAS and BSA in different ratio was investigated by corroboration of various techniques of characterization as: spectroscopy, microscopy, thermo-gravimetric analysis, DLS and zeta potential determination, measurements which were performed in static and/or dynamic conditions. The static contact angle of the sample films was also determined in order to evaluate the changes brought upon surface free energy of the prepared PPCs in interdependence with the complexes composition. The evolution of hydrodynamic diameter and zeta potential of the PPC, recorded in situ, confirm changes of both co-partners conformation, a 1/1 ratio between protein and polyelectrolyte being benefit for the preparation of a stable PPC. Also, the study evidenced the dependence of PPC formation on the temperature of preparation. Thus, at low temperatures the PPC is formed with compact structure, small dimension and hydrodynamic diameter, close to those of BSA. The behavior at thermal treatment of the prepared PPCs is in agreement with the composition of the complexes. From the contact angle determination results the increase of the PPC films cohesion, which is higher than that of BSA films. Also, a higher hydrophobicity corresponds to the new PPC films denoting a good adhesion of the red blood cells onto the surface of PSA/BSA interpenetrated systems. The SEM investigation evidenced as well the specific internal structure of PPC concretized in phases with different size and shape in interdependence with the interpolymer mixture composition. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte%20%E2%80%93%20protein%20complex" title="polyelectrolyte – protein complex">polyelectrolyte – protein complex</a>, <a href="https://publications.waset.org/abstracts/search?q=bovine%20serum%20albumin" title=" bovine serum albumin"> bovine serum albumin</a>, <a href="https://publications.waset.org/abstracts/search?q=poly%28aspartic%20acid%29" title=" poly(aspartic acid)"> poly(aspartic acid)</a>, <a href="https://publications.waset.org/abstracts/search?q=self-assembly" title=" self-assembly"> self-assembly</a> </p> <a href="https://publications.waset.org/abstracts/40466/tailorability-of-polyaspartic-acidbsa-complex-by-self-assembling-in-aqueous-solutions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40466.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">246</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">18</span> Immobilization of Superoxide Dismutase Enzyme on Layered Double Hydroxide Nanoparticles</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Istvan%20Szilagyi">Istvan Szilagyi</a>, <a href="https://publications.waset.org/abstracts/search?q=Marko%20Pavlovic"> Marko Pavlovic</a>, <a href="https://publications.waset.org/abstracts/search?q=Paul%20Rouster"> Paul Rouster</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Antioxidant enzymes are the most efficient defense systems against reactive oxygen species, which cause severe damage in living organisms and industrial products. However, their supplementation is problematic due to their high sensitivity to the environmental conditions. Immobilization on carrier nanoparticles is a promising research direction towards the improvement of their functional and colloidal stability. In that way, their applications in biomedical treatments and manufacturing processes in the food, textile and cosmetic industry can be extended. The main goal of the present research was to prepare and formulate antioxidant bionanocomposites composed of superoxide dismutase (SOD) enzyme, anionic clay (layered double hydroxide, LDH) nanoparticle and heparin (HEP) polyelectrolyte. To characterize the structure and the colloidal stability of the obtained compounds in suspension and solid state, electrophoresis, dynamic light scattering, transmission electron microscopy, spectrophotometry, thermogravimetry, X-ray diffraction, infrared and fluorescence spectroscopy were used as experimental techniques. LDH-SOD composite was synthesized by enzyme immobilization on the clay particles via electrostatic and hydrophobic interactions, which resulted in a strong adsorption of the SOD on the LDH surface, i.e., no enzyme leakage was observed once the material was suspended in aqueous solutions. However, the LDH-SOD showed only limited resistance against salt-induced aggregation and large irregularly shaped clusters formed during short term interval even at lower ionic strengths. Since sufficiently high colloidal stability is a key requirement in most of the applications mentioned above, the nanocomposite was coated with HEP polyelectrolyte to develop highly stable suspensions of primary LDH-SOD-HEP particles. HEP is a natural anticoagulant with one of the highest negative line charge density among the known macromolecules. The experimental results indicated that it strongly adsorbed on the oppositely charged LDH-SOD surface leading to charge inversion and to the formation of negatively charged LDH-SOD-HEP. The obtained hybrid materials formed stable suspension even under extreme conditions, where classical colloid chemistry theories predict rapid aggregation of the particles and unstable suspensions. Such a stabilization effect originated from electrostatic repulsion between the particles of the same sign of charge as well as from steric repulsion due to the osmotic pressure raised during the overlap of the polyelectrolyte chains adsorbed on the surface. In addition, the SOD enzyme kept its structural and functional integrity during the immobilization and coating processes and hence, the LDH-SOD-HEP bionanocomposite possessed excellent activity in decomposition of superoxide radical anions, as revealed in biochemical test reactions. In conclusion, due to the improved colloidal stability and the good efficiency in scavenging superoxide radical ions, the developed enzymatic system is a promising antioxidant candidate for biomedical or other manufacturing processes, wherever the aim is to decompose reactive oxygen species in suspensions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=clay" title="clay">clay</a>, <a href="https://publications.waset.org/abstracts/search?q=enzyme" title=" enzyme"> enzyme</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolyte" title=" polyelectrolyte"> polyelectrolyte</a>, <a href="https://publications.waset.org/abstracts/search?q=formulation" title=" formulation"> formulation</a> </p> <a href="https://publications.waset.org/abstracts/69869/immobilization-of-superoxide-dismutase-enzyme-on-layered-double-hydroxide-nanoparticles" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/69869.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">268</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">17</span> Layer-By-Layer Deposition of Poly(Ethylene Imine) Nanolayers on Polypropylene Nonwoven Fabric: Electrostatic and Thermal Properties</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Dawid%20Stawski">Dawid Stawski</a>, <a href="https://publications.waset.org/abstracts/search?q=Silviya%20Halacheva"> Silviya Halacheva</a>, <a href="https://publications.waset.org/abstracts/search?q=Dorota%20Zieli%C5%84ska"> Dorota Zielińska</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The surface properties of many materials can be readily and predictably modified by the controlled deposition of thin layers containing appropriate functional groups and this research area is now a subject of widespread interest. The layer-by-layer (lbl) method involves depositing oppositely charged layers of polyelectrolytes onto the substrate material which are stabilized due to strong electrostatic forces between adjacent layers. This type of modification affords products that combine the properties of the original material with the superficial parameters of the new external layers. Through an appropriate selection of the deposited layers, the surface properties can be precisely controlled and readily adjusted in order to meet the requirements of the intended application. In the presented paper a variety of anionic (poly(acrylic acid)) and cationic (linear poly(ethylene imine), polymers were successfully deposited onto the polypropylene nonwoven using the lbl technique. The chemical structure of the surface before and after modification was confirmed by reflectance FTIR spectroscopy, volumetric analysis and selective dyeing tests. As a direct result of this work, new materials with greatly improved properties have been produced. For example, following a modification process significant changes in the electrostatic activity of a range of novel nanocomposite materials were observed. The deposition of polyelectrolyte nanolayers was found to strongly accelerate the loss of electrostatically generated charges and to increase considerably the thermal resistance properties of the modified fabric (the difference in T50% is over 20°C). From our results, a clear relationship between the type of polyelectrolyte layer deposited onto the flat fabric surface and the properties of the modified fabric was identified. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=layer-by-layer%20technique" title="layer-by-layer technique">layer-by-layer technique</a>, <a href="https://publications.waset.org/abstracts/search?q=polypropylene%20nonwoven" title=" polypropylene nonwoven"> polypropylene nonwoven</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20modification" title=" surface modification"> surface modification</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20properties" title=" surface properties"> surface properties</a> </p> <a href="https://publications.waset.org/abstracts/6453/layer-by-layer-deposition-of-polyethylene-imine-nanolayers-on-polypropylene-nonwoven-fabric-electrostatic-and-thermal-properties" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6453.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">435</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">16</span> Layer-by-Layer Modified Ceramic Membranes for Micropollutant Removal</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jenny%20Radeva">Jenny Radeva</a>, <a href="https://publications.waset.org/abstracts/search?q=Anke-Gundula%20Roth"> Anke-Gundula Roth</a>, <a href="https://publications.waset.org/abstracts/search?q=Christian%20Goebbert"> Christian Goebbert</a>, <a href="https://publications.waset.org/abstracts/search?q=Robert%20Niestroj-Pahl"> Robert Niestroj-Pahl</a>, <a href="https://publications.waset.org/abstracts/search?q=Lars%20Daehne"> Lars Daehne</a>, <a href="https://publications.waset.org/abstracts/search?q=Axel%20Wolfram"> Axel Wolfram</a>, <a href="https://publications.waset.org/abstracts/search?q=Juergen%20Wiese"> Juergen Wiese</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Ceramic membranes for water purification combine excellent stability with long-life characteristics and high chemical resistance. Layer-by-Layer coating is a well-known technique for customization and optimization of filtration properties of membranes but is mostly used on polymeric membranes. Ceramic membranes comprising a metal oxide filtration layer of Al2O3 or TiO2 are charged and therefore highly suitable for polyelectrolyte adsorption. The high stability of the membrane support allows efficient backwash and chemical cleaning of the membrane. The presented study reports metal oxide/organic composite membrane with an increased rejection of bivalent salts like MgSO4 and the organic micropollutant Diclofenac. A self-build apparatus was used for applying the polyelectrolyte multilayers on the ceramic membrane. The device controls the flow and timing of the polyelectrolytes and washing solutions. As support for the Layer-by-Layer coat, ceramic mono-channel membranes were used with an inner capillary of 8 mm diameter, which is connected to the coating device. The inner wall of the capillary is coated subsequently with polycat- and anions. The filtration experiments were performed with a feed solution of MgSO4 and Diclofenac. The salt content of the permeate was detected conductometrically and Diclofenac was measured with UV-Adsorption. The concluded results show retention values of magnesium sulfate of 70% and diclofenac retention of 60%. Further experimental research studied various parameters of the composite membrane-like Molecular Weight Cut Off and pore size, Zeta potential and its mechanical and chemical robustness. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=water%20purification" title="water purification">water purification</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolytes" title=" polyelectrolytes"> polyelectrolytes</a>, <a href="https://publications.waset.org/abstracts/search?q=membrane%20modification" title=" membrane modification"> membrane modification</a>, <a href="https://publications.waset.org/abstracts/search?q=layer-by-layer%20coating" title=" layer-by-layer coating"> layer-by-layer coating</a>, <a href="https://publications.waset.org/abstracts/search?q=ceramic%20membranes" title=" ceramic membranes"> ceramic membranes</a> </p> <a href="https://publications.waset.org/abstracts/138651/layer-by-layer-modified-ceramic-membranes-for-micropollutant-removal" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/138651.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">245</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">15</span> Polysaccharide Polyelectrolyte Complexation: An Engineering Strategy for the Development of Commercially Viable Sustainable Materials</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jeffrey%20M.%20Catchmark">Jeffrey M. Catchmark</a>, <a href="https://publications.waset.org/abstracts/search?q=Parisa%20Nazema"> Parisa Nazema</a>, <a href="https://publications.waset.org/abstracts/search?q=Caini%20Chen"> Caini Chen</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei-Shu%20Lin"> Wei-Shu Lin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Sustainable and environmentally compatible materials are needed for a wide variety of volume commercial applications. Current synthetic materials such as plastics, fluorochemicals (such as PFAS), adhesives and resins in form of sheets, laminates, coatings, foams, fibers, molded parts and composites are used for countless products such as packaging, food handling, textiles, biomedical, construction, automotive and general consumer devices. Synthetic materials offer distinct performance advantages including stability, durability and low cost. These attributes are associated with the physical and chemical properties of these materials that, once formed, can be resistant to water, oils, solvents, harsh chemicals, salt, temperature, impact, wear and microbial degradation. These advantages become disadvantages when considering the end of life of these products which generate significant land and water pollution when disposed of and few are recycled. Agriculturally and biologically derived polymers offer the potential of remediating these environmental and life-cycle difficulties, but face numerous challenges including feedstock supply, scalability, performance and cost. Such polymers include microbial biopolymers like polyhydroxyalkanoates and polyhydroxbutirate; polymers produced using biomonomer chemical synthesis like polylactic acid; proteins like soy, collagen and casein; lipids like waxes; and polysaccharides like cellulose and starch. Although these materials, and combinations thereof, exhibit the potential for meeting some of the performance needs of various commercial applications, only cellulose and starch have both the production feedstock volume and cost to compete with petroleum derived materials. Over 430 million tons of plastic is produced each year and plastics like low density polyethylene cost ~$1500 to $1800 per ton. Over 400 million tons of cellulose and over 100 million tons of starch are produced each year at a volume cost as low as ~$500 to $1000 per ton with the capability of increased production. Cellulose and starches, however, are hydroscopic materials that do not exhibit the needed performance in most applications. Celluloses and starches can be chemically modified to contain positive and negative surface charges and such modified versions of these are used in papermaking, foods and cosmetics. Although these modified polysaccharides exhibit the same performance limitations, recent research has shown that composite materials comprised of cationic and anionic polysaccharides in polyelectrolyte complexation exhibit significantly improved performance including stability in diverse environments. Moreover, starches with added plasticizers can exhibit thermoplasticity, presenting the possibility of improved thermoplastic starches when comprised of starches in polyelectrolyte complexation. In this work, the potential for numerous volume commercial products based on polysaccharide polyelectrolyte complexes (PPCs) will be discussed, including the engineering design strategy used to develop them. Research results will be detailed including the development and demonstration of starch PPC compositions for paper coatings to replace PFAS; adhesives; foams for packaging, insulation and biomedical applications; and thermoplastic starches. In addition, efforts to demonstrate the potential for volume manufacturing with industrial partners will be discussed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=biomaterials%20engineering" title="biomaterials engineering">biomaterials engineering</a>, <a href="https://publications.waset.org/abstracts/search?q=commercial%20materials" title=" commercial materials"> commercial materials</a>, <a href="https://publications.waset.org/abstracts/search?q=polysaccharides" title=" polysaccharides"> polysaccharides</a>, <a href="https://publications.waset.org/abstracts/search?q=sustainable%20materials" title=" sustainable materials"> sustainable materials</a> </p> <a href="https://publications.waset.org/abstracts/191252/polysaccharide-polyelectrolyte-complexation-an-engineering-strategy-for-the-development-of-commercially-viable-sustainable-materials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/191252.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">17</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">14</span> Monitoring Surface Modification of Polylactide Nonwoven Fabric with Weak Polyelectrolytes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sima%20Shakoorjavan">Sima Shakoorjavan</a>, <a href="https://publications.waset.org/abstracts/search?q=Dawid%20Stawski"> Dawid Stawski</a>, <a href="https://publications.waset.org/abstracts/search?q=Somaye%20Akbari"> Somaye Akbari</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, great attempts have been made to initially modify polylactide (PLA) nonwoven surface with poly(amidoamine) (PAMMA) dendritic polymer to create amine active sites on PLA surface through aminolysis reaction. Further, layer-by-layer deposition of four layers of two weak polyelectrolytes, including PAMAM as polycation and polyacrylic acid (PAA) as polyanion on activated PLA, was monitored with turbidity analysis of waste-polyelectrolytes after each deposition step. The FTIR-ATR analysis confirmed the successful introduction of amine groups into PLA polymeric chains through the emerging peak around 1650 cm⁻¹ corresponding to N-H bending vibration and a double wide peak at around 3670-3170 cm⁻¹ corresponding to N-H stretching vibration. The adsorption-desorption behavior of (PAMAM) and poly (PAA) deposition was monitored by turbidity test. Turbidity results showed the desorption and removal of the previously deposited layer (second and third layers) upon the desorption of the next layers (third and fourth layers). Also, the importance of proper rinsing after aminolysis of PLA nonwoven fabric was revealed by turbidity test. Regarding the sample with insufficient rinsing process, higher desorption and removal of ungrafted PAMAM from aminolyzed-PLA surface into PAA solution was detected upon the deposition of the first PAA layer. This phenomenon can be due to electrostatic attraction between polycation (PAMAM) and polyanion (PAA). Moreover, the successful layer deposition through LBL was confirmed by the staining test of acid red 1 through spectrophotometry analysis. According to the results, layered PLA with four layers with PAMAM as the top layer showed higher dye absorption (46.7%) than neat (1.2%) and aminolyzed PLA (21.7%). In conclusion, the complicated adsorption-desorption behavior of dendritic polycation and linear polyanion systems was observed. Although desorption and removal of previously adsorbed layers occurred upon the deposition of the next layer, the remaining polyelectrolyte on the substrate is sufficient for the adsorption of the next polyelectrolyte through electrostatic attraction between oppositely charged polyelectrolytes. Also, an increase in dye adsorption confirmed more introduction of PAMAM onto PLA surface through LBL. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=surface%20modification" title="surface modification">surface modification</a>, <a href="https://publications.waset.org/abstracts/search?q=layer-by-layer%20technique" title=" layer-by-layer technique"> layer-by-layer technique</a>, <a href="https://publications.waset.org/abstracts/search?q=weak%20polyelectrolytes" title=" weak polyelectrolytes"> weak polyelectrolytes</a>, <a href="https://publications.waset.org/abstracts/search?q=adsorption-desorption%20behavior" title=" adsorption-desorption behavior"> adsorption-desorption behavior</a> </p> <a href="https://publications.waset.org/abstracts/179727/monitoring-surface-modification-of-polylactide-nonwoven-fabric-with-weak-polyelectrolytes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/179727.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">64</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">13</span> Electromechanical Behaviour of Chitosan Based Electroactive Polymer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Sarikanat">M. Sarikanat</a>, <a href="https://publications.waset.org/abstracts/search?q=E.%20Akar"> E. Akar</a>, <a href="https://publications.waset.org/abstracts/search?q=I.%20%C5%9Een"> I. Şen</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Seki"> Y. Seki</a>, <a href="https://publications.waset.org/abstracts/search?q=O.%20C.%20Y%C4%B1lmaz"> O. C. Yılmaz</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20O.%20G%C3%BCrses"> B. O. Gürses</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Cetin"> L. Cetin</a>, <a href="https://publications.waset.org/abstracts/search?q=O.%20%C3%96zdemir"> O. Özdemir</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Sever"> K. Sever</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Chitosan is a natural, nontoxic, polyelectrolyte, cheap polymer. In this study, chitosan based electroactive polymer (CBEAP) was fabricated. Electroactive properties of this polymer were investigated at different voltages. It exhibited excellent tip displacement at low voltages (1, 3, 5, 7 V). Tip displacement was increased as the applied voltage increased. Best tip displacement was investigated as 28 mm at 5V. Characterization of CBEAP was investigated by scanning electron microscope, X-ray diffraction and tensile testing. CBEAP exhibited desired electroactive properties at low voltages. It is suitable for using in artificial muscle and various robotic applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=chitosan" title="chitosan">chitosan</a>, <a href="https://publications.waset.org/abstracts/search?q=electroactive%20polymer" title=" electroactive polymer"> electroactive polymer</a>, <a href="https://publications.waset.org/abstracts/search?q=electroactive%20properties" title=" electroactive properties"> electroactive properties</a> </p> <a href="https://publications.waset.org/abstracts/25625/electromechanical-behaviour-of-chitosan-based-electroactive-polymer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/25625.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">512</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">12</span> Polymer Advancement with Poly(High Internal Phase Emulsion) Poly(S/DVB) Modified via Layer-by-Layer for CO2 Adsorption</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Saifon%20Chongthub">Saifon Chongthub</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The purpose of this research is to synthesize adsorbent foam for CO2 adsorption. The polymer was prepared from poly High Internal Phase Emulsion (PolyHIPE) using styrene as monomer and divinylbenzene as comonomer. Its morphology was determined by Scanning Electron Microscopy (SEM). To further increased CO2 adsorption of the prepared polyHIPE, the layer by layer (LbL) technique was applied, which alternated polyelectrolyte injection between layers of Poly(styrenesulfonate) (PSS) and Poly(diallyldimetyl-ammonium chloride)(PDADMAC) as primary layer, and layers of PSS and polyetyleneimine (PEI) as secondary layer. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=high%20internal%20phase%20emulsion" title="high internal phase emulsion">high internal phase emulsion</a>, <a href="https://publications.waset.org/abstracts/search?q=polyHIPE" title=" polyHIPE"> polyHIPE</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20modification" title=" surface modification"> surface modification</a>, <a href="https://publications.waset.org/abstracts/search?q=layer%20by%20layer%20technique" title=" layer by layer technique"> layer by layer technique</a>, <a href="https://publications.waset.org/abstracts/search?q=CO2%20adsorption" title=" CO2 adsorption"> CO2 adsorption</a> </p> <a href="https://publications.waset.org/abstracts/2180/polymer-advancement-with-polyhigh-internal-phase-emulsion-polysdvb-modified-via-layer-by-layer-for-co2-adsorption" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2180.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">289</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">11</span> Radiofrequency and Near-Infrared Responsive Core-Shell Multifunctional Nanostructures Using Lipid Templates for Cancer Theranostics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Animesh%20Pan">Animesh Pan</a>, <a href="https://publications.waset.org/abstracts/search?q=Geoffrey%20D.%20Bothun"> Geoffrey D. Bothun</a> </p> <p class="card-text"><strong>Abstract:</strong></p> With the development of nanotechnology, research in multifunctional delivery systems has a new pace and dimension. An incipient challenge is to design an all-in-one delivery system that can be used for multiple purposes, including tumor targeting therapy, radio-frequency (RF-), near-infrared (NIR-), light-, or pH-induced controlled release, photothermal therapy (PTT), photodynamic therapy (PDT), and medical diagnosis. In this regard, various inorganic nanoparticles (NPs) are known to show great potential as the 'functional components' because of their fascinating and tunable physicochemical properties and the possibility of multiple theranostic modalities from individual NPs. Magnetic, luminescent, and plasmonic properties are the three most extensively studied and, more importantly biomedically exploitable properties of inorganic NPs. Although successful attempts of combining any two of them above mentioned functionalities have been made, integrating them in one system has remained challenge. Keeping those in mind, controlled designs of complex colloidal nanoparticle system are one of the most significant challenges in nanoscience and nanotechnology. Therefore, systematic and planned studies providing better revelation are demanded. We report a multifunctional delivery platform-based liposome loaded with drug, iron-oxide magnetic nanoparticles (MNPs), and a gold shell on the surface of liposomes, were synthesized using a lipid with polyelectrolyte (layersomes) templating technique. MNPs and the anti-cancer drug doxorubicin (DOX) were co-encapsulated inside liposomes composed by zwitterionic phophatidylcholine and anionic phosphatidylglycerol using reverse phase evaporation (REV) method. The liposomes were coated with positively charge polyelectrolyte (poly-L-lysine) to enrich the interface with gold anion, exposed to a reducing agent to form a gold nanoshell, and then capped with thio-terminated polyethylene glycol (SH-PEG2000). The core-shell nanostructures were characterized by different techniques like; UV-Vis/NIR scanning spectrophotometer, dynamic light scattering (DLS), transmission electron microscope (TEM). This multifunctional system achieves a variety of functions, such as radiofrequency (RF)-triggered release, chemo-hyperthermia, and NIR laser-triggered for photothermal therapy. Herein, we highlight some of the remaining major design challenges in combination with preliminary studies assessing therapeutic objectives. We demonstrate an efficient loading and delivery system to significant cell death of human cancer cells (A549) with therapeutic capabilities. Coupled with RF and NIR excitation to the doxorubicin-loaded core-shell nanostructure helped in securing targeted and controlled drug release to the cancer cells. The present core-shell multifunctional system with their multimodal imaging and therapeutic capabilities would be eminent candidates for cancer theranostics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cancer%20thernostics" title="cancer thernostics">cancer thernostics</a>, <a href="https://publications.waset.org/abstracts/search?q=multifunctional%20nanostructure" title=" multifunctional nanostructure"> multifunctional nanostructure</a>, <a href="https://publications.waset.org/abstracts/search?q=photothermal%20therapy" title=" photothermal therapy"> photothermal therapy</a>, <a href="https://publications.waset.org/abstracts/search?q=radiofrequency%20targeting" title=" radiofrequency targeting"> radiofrequency targeting</a> </p> <a href="https://publications.waset.org/abstracts/103921/radiofrequency-and-near-infrared-responsive-core-shell-multifunctional-nanostructures-using-lipid-templates-for-cancer-theranostics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/103921.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">128</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">10</span> Kinetic and Thermodynamic Modified Pectin with Chitosan by Forming Polyelectrolyte Complex Adsorbent to Remediate of Pb(II)</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Budi%20Hastuti">Budi Hastuti</a>, <a href="https://publications.waset.org/abstracts/search?q=Mudasir"> Mudasir</a>, <a href="https://publications.waset.org/abstracts/search?q=Dwi%20Siswanta"> Dwi Siswanta</a>, <a href="https://publications.waset.org/abstracts/search?q=Triyono"> Triyono</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Biosorbent, such as pectin and chitosan, are usually produced with low physical stability, thus the materials need to be modified. In this research, the physical characteristic of adsorbent was increased by grafting chitosan using acetate carboxymetyl chitosan (CC). Further, CC and Pectin (Pec) were crosslinked using cross-linking agent BADGE (bis phenol A diglycidyl ether) to get CC-Pec-BADGE (CPB) adsorbent. The cross-linking processes aim to form stable structure and resistance on acidic media. Furthermore, in order to increase the adsorption capacity in removing Pb(II), the adsorbent was added with NaCl to form macroporous adsorbent named CCPec-BADGE-Na (CPB-Na). The physical and chemical characteristics of the porogenic adsorbent structure were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The adsorption parameter of CPB-Na to adsorb Pb(II) ion was determined. The kinetics and thermodynamics of the bath sorption of Pb(II) on CPB-Na adsorbent and using chitosan and pectin as a comparison were also studied. The results showed that the CPB-Na biosorbent was stable on acidic media. It had a rough and porous surface area, increased and gave higher sorption capacity for removal of Pb(II) ion. The CPB-Na 1/1 and 1/3 adsorbent adsorbed Pb(II) with adsorption capacity of 45.48 mg/g and 45.97 mg/g respectively, whereas pectin and chitosan were of 39.20 mg /g and 24.67 mg /g respectively. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=porogen" title="porogen">porogen</a>, <a href="https://publications.waset.org/abstracts/search?q=Pectin" title=" Pectin"> Pectin</a>, <a href="https://publications.waset.org/abstracts/search?q=Carboxymethyl%20Chitosan%20%28CC%29" title=" Carboxymethyl Chitosan (CC)"> Carboxymethyl Chitosan (CC)</a>, <a href="https://publications.waset.org/abstracts/search?q=CC-%20Pec-BADGE-Na" title=" CC- Pec-BADGE-Na"> CC- Pec-BADGE-Na</a> </p> <a href="https://publications.waset.org/abstracts/91832/kinetic-and-thermodynamic-modified-pectin-with-chitosan-by-forming-polyelectrolyte-complex-adsorbent-to-remediate-of-pbii" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/91832.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">158</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9</span> Application of Moringa Oleifer Seed in Removing Colloids from Turbid Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zemmouri%20Hassiba">Zemmouri Hassiba</a>, <a href="https://publications.waset.org/abstracts/search?q=Lounici%20Hakim"> Lounici Hakim</a>, <a href="https://publications.waset.org/abstracts/search?q=Mameri%20Nabil"> Mameri Nabil</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Dried crushed seeds of Moringa oleifera contain an effective soluble protein; a natural cationic polyelectrolyte which causes coagulation. The present study aims to investigate the performance of Moringa oleifera seed extract as natural coagulant in clarification of secondary wastewater treatment highly charged in colloidal. A series of Jar tests was undertaken using raw wastewater providing from secondary decanter of Reghaia municipal wastewater treatment plant (MWWTP) located in East of Algiers, Algeria. Coagulation flocculation performance of Moringa oleifera was evaluated through supernatant residual turbidity. Various influence parameters namely Moringa oleifera dosage and pH have been considered. Tests on Reghaia wastewater, having 129 NTU of initial turbidity, showed a removal of 69.45% of residual turbidity with only 1.5 mg/l of Moringa oleifera. This sufficient removal capability encourages the use of this bioflocculant for treatment of turbid waters. Based on this result, the coagulant seed extract of Moringa oleifera is better suited to clarify municipal wastewater by removing turbidity. Indeed, Moringa oleifera which is a natural resource available locally (South of Algeria) coupled to the non-toxicity, biocompatibility and biodegradability, may be a very interesting alternative to the conventional coagulants used so far. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=coagulation%20flocculation" title="coagulation flocculation">coagulation flocculation</a>, <a href="https://publications.waset.org/abstracts/search?q=colloids" title=" colloids"> colloids</a>, <a href="https://publications.waset.org/abstracts/search?q=moringa%20oleifera" title=" moringa oleifera"> moringa oleifera</a>, <a href="https://publications.waset.org/abstracts/search?q=secondary%20wastewater" title=" secondary wastewater"> secondary wastewater</a> </p> <a href="https://publications.waset.org/abstracts/31792/application-of-moringa-oleifer-seed-in-removing-colloids-from-turbid-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31792.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">312</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">8</span> Microstructure Analysis of Biopolymer Mixture (Chia-Gelatin) by Laser Confocal Microscopy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Emmanuel%20Flores%20Huicochea">Emmanuel Flores Huicochea</a>, <a href="https://publications.waset.org/abstracts/search?q=Guadalupe%20Borja%20Mendiola"> Guadalupe Borja Mendiola</a>, <a href="https://publications.waset.org/abstracts/search?q=Jacqueline%20Flores%20Lopez"> Jacqueline Flores Lopez</a>, <a href="https://publications.waset.org/abstracts/search?q=Rodolfo%20Rendon%20Villalobos"> Rodolfo Rendon Villalobos</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The usual procedure to investigate the properties of biodegradable films has been to prepare the film, measure the mechanical or transport properties and then decide whether the mixture has better properties than the individual components, instead of investigating whether the mixture has biopolymer-biopolymer interaction, then prepare the film and finally measure the properties of the film. The work investigates the presence of interaction biopolymer-biopolymer in a mixture of chia biopolymer and gelatin using Laser Confocal Microscopy (LCM). Previously, the chia biopolymer was obtained from chia seed. CML analysis of mixtures of chia biopolymer-gelatin without Na⁺ ions exhibited aggregates of different size, in the range of 100-400 μm, of defined color, for the two colors, but no mixing of color was observed. The increased of gelatin in the mixture decreases the size and number of aggregates. The tridimensional microstructure reveled that there are two layers of biopolymers, chia and gelatin well defined. The mixture chia biopolymer-gelatin with 10 mM Na⁺ and with a ratio 75:25 (chia-gelatin) showed lower aggregated size than others mixture with and without ions. This result could be explained because the chia biopolymer is a polyelectrolyte and the added sodium ions reduce the molecular rigidity by neutralizing the negative charges that the chia biopolymer possesses and therefore a better biopolymer-biopolymer interaction is allowed between the biopolymer of chia and gelatin. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=biopolymer-biopolymer%20interaction" title="biopolymer-biopolymer interaction">biopolymer-biopolymer interaction</a>, <a href="https://publications.waset.org/abstracts/search?q=confocal%20laser%20microscopy" title=" confocal laser microscopy"> confocal laser microscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=CLM" title=" CLM"> CLM</a>, <a href="https://publications.waset.org/abstracts/search?q=microstructure" title=" microstructure"> microstructure</a>, <a href="https://publications.waset.org/abstracts/search?q=mixture%20chia-gelatin" title=" mixture chia-gelatin"> mixture chia-gelatin</a> </p> <a href="https://publications.waset.org/abstracts/82302/microstructure-analysis-of-biopolymer-mixture-chia-gelatin-by-laser-confocal-microscopy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/82302.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">208</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7</span> Application of Stabilized Polyaniline Microparticles for Better Protective Ability of Zinc Coatings</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=N.%20Boshkova">N. Boshkova</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Kamburova"> K. Kamburova</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Tabakova"> N. Tabakova</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Boshkov"> N. Boshkov</a>, <a href="https://publications.waset.org/abstracts/search?q=Ts.%20Radeva"> Ts. Radeva</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Coatings based on polyaniline (PANI) can improve the resistance of steel against corrosion. In this work, the preparation of stable suspensions of colloidal PANI-SiO<sub>2 </sub>particles, suitable for obtaining of composite anticorrosive coating on steel, is described. Electrokinetic data as a function of pH are presented, showing that the zeta potentials of the PANI-SiO<sub>2</sub> particles are governed primarily by the charged groups at the silica oxide surface. Electrosteric stabilization of the PANI-SiO<sub>2</sub> particles’ suspension against aggregation is realized at pH>5.5 (EB form of PANI) by adsorption of positively charged polyelectrolyte molecules onto negatively charged PANI-SiO<sub>2</sub> particles. The PANI-SiO<sub>2</sub> particles are incorporated by electrodeposition into the metal matrix of zinc in order to obtain composite (hybrid) coatings. The latter are aimed to ensure sacrificial protection of steel mainly in aggressive media leading to local corrosion damages. The surface morphology of the composite zinc coatings is investigated with SEM. The influence of PANI-SiO<sub>2</sub> particles on the cathodic and anodic processes occurring in the starting electrolyte for obtaining of the coatings is followed with cyclic voltammetry. The electrochemical and corrosion behavior is evaluated with potentiodynamic polarization curves and polarization resistance measurements. The beneficial effect of the stabilized PANI-SiO<sub>2</sub> particles for the increased protective ability of the composites is commented and discussed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=corrosion" title="corrosion">corrosion</a>, <a href="https://publications.waset.org/abstracts/search?q=polyaniline-silica%20particles" title=" polyaniline-silica particles"> polyaniline-silica particles</a>, <a href="https://publications.waset.org/abstracts/search?q=zinc" title=" zinc"> zinc</a>, <a href="https://publications.waset.org/abstracts/search?q=protective%20ability" title=" protective ability"> protective ability</a> </p> <a href="https://publications.waset.org/abstracts/90974/application-of-stabilized-polyaniline-microparticles-for-better-protective-ability-of-zinc-coatings" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/90974.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">173</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">6</span> Formation of Stable Aqueous Dispersions of Polyaniline-Silica Particles for Application in Anticorrosive Coatings on Steel</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=K.%20Kamburova">K. Kamburova</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Boshkova"> N. Boshkova</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Boshkov"> N. Boshkov</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Radeva"> T. Radeva</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Coatings based on polyaniline (PANI) can improve the resistance of steel against corrosion. Two forms of PANI are generally accepted to have effective protection of steel: the conducting emeraldine salt (ES) and the non-conducting emeraldine base (EB). The ability to intercept electrons at the metal surface and to transport them is typically attributed to ES, while the success of EB as an anticorrosive additive in the coating is attributed to its ability to oxidize and reduce in a reversible way. This electrochemical mechanism is probably combined with barrier effect against corrosion species. In this work, we describe the preparation of stable suspensions of colloidal PANI-SiO₂ particles, suitable for obtaining of composite anticorrosive coating on steel. Electrokinetic data as a function of pH are presented, showing that the zeta potentials of the PANI-SiO₂ particles are governed primarily by the charged groups at the silica oxide surface. Electrosteric stabilization of the PANI-SiO₂ particles’ suspension against aggregation is realized at pH > 5.5 (EB form of PANI) by adsorption of positively charged polyelectrolyte molecules onto negatively charged PANI-SiO₂ particles. We anticipate that incorporation of the small particles will provide a more homogeneous distribution in the coating matrix and will decrease the negative effect on barrier properties of the composite coating. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=particles" title="particles">particles</a>, <a href="https://publications.waset.org/abstracts/search?q=stable%20dispersion" title=" stable dispersion"> stable dispersion</a>, <a href="https://publications.waset.org/abstracts/search?q=composite%20coatings" title=" composite coatings"> composite coatings</a>, <a href="https://publications.waset.org/abstracts/search?q=corrosion%20protection" title=" corrosion protection"> corrosion protection</a> </p> <a href="https://publications.waset.org/abstracts/90935/formation-of-stable-aqueous-dispersions-of-polyaniline-silica-particles-for-application-in-anticorrosive-coatings-on-steel" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/90935.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">175</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5</span> Independent Control over Surface Charge and Wettability Using Polyelectrolyte Architecture</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shanshan%20Guo">Shanshan Guo</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiaoying%20Zhu"> Xiaoying Zhu</a>, <a href="https://publications.waset.org/abstracts/search?q=Dominik%20Ja%C5%84czewski"> Dominik Jańczewski</a>, <a href="https://publications.waset.org/abstracts/search?q=Koon%20Gee%20Neoh"> Koon Gee Neoh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Surface charge and wettability are two prominent physical factors governing cell adhesion and have been extensively studied in the literature. However, a comparison between the two driving forces in terms of their independent and cooperative effects in affecting cell adhesion is rarely explored on a systematic and quantitative level. Herein, we formulate a protocol which allows two-dimensional and independent control over both surface charge and wettability. This protocol enables the unambiguous comparison of the effects of these two properties on cell adhesion. This strategy is implemented by controlling both the relative thickness of polyion layers in the layer-by-layer assembly and the polyion side chain chemical structures. The 2D property matrix spans surface isoelectric point ranging from 5 to 9 and water contact angle from 35º to 70º, with other interferential factors (e.g. roughness) eliminated. The interplay between these two surface variables influences 3T3 fibroblast cell adhesion. The results show that both surface charge and wettability have an effect on its adhesion. The combined effects of positive charge and hydrophilicity led to the highest cell adhesion whereas negative charge and hydrophobicity led to the lowest cell adhesion. Our design strategy can potentially form the basis for studying the distinct behaviors of electrostatic force or wettability driven interfacial phenomena and serving as a reference in future studies assessing cell adhesion to surfaces with known charge and wettability within the property range studied here. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cell%20adhesion" title="cell adhesion">cell adhesion</a>, <a href="https://publications.waset.org/abstracts/search?q=layer-by-layer" title=" layer-by-layer"> layer-by-layer</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20charge" title=" surface charge"> surface charge</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20wettability" title=" surface wettability"> surface wettability</a> </p> <a href="https://publications.waset.org/abstracts/57245/independent-control-over-surface-charge-and-wettability-using-polyelectrolyte-architecture" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/57245.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">270</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">4</span> Characterization on Molecular Weight of Polyamic Acids Using GPC Coupled with Multiple Detectors</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mei%20Hong">Mei Hong</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei%20Liu"> Wei Liu</a>, <a href="https://publications.waset.org/abstracts/search?q=Xuemin%20Dai"> Xuemin Dai</a>, <a href="https://publications.waset.org/abstracts/search?q=Yanxiong%20Pan"> Yanxiong Pan</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiangling%20Ji">Xiangling Ji</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polyamic acid (PAA) is the precursor of polyimide (PI) prepared by a two-step method, its molecular weight and molecular weight distribution not only play an important role during the preparation and processing, but also influence the final performance of PI. However, precise characterization on molecular weight of PAA is still a challenge because of the existence of very complicated interactions in the solution system, including the electrostatic interaction, hydrogen bond interaction, dipole-dipole interaction, etc. Thus, it is necessary to establisha suitable strategy which can completely suppress these complex effects and get reasonable data on molecular weight. Herein, the gel permeation chromatography (GPC) coupled with differential refractive index (RI) and multi-angle laser light scattering (MALLS) detectors were applied to measure the molecular weight of (6FDA-DMB) PAA using different mobile phases, LiBr/DMF, LiBr/H3PO4/THF/DMF, LiBr/HAc/THF/DMF, and LiBr/HAc/DMF, respectively. It was found that combination of LiBr with HAc can shield the above-mentioned complex interactions and is more conducive to the separation of PAA than only addition of LiBr in DMF. LiBr/HAc/DMF was employed for the first time as a mild mobile phase to effectively separate PAA and determine its molecular weight. After a series of conditional experiments, 0.02M LiBr/0.2M HAc/DMF was fixed as an optimized mobile phase to measure the relative and absolute molecular weights of (6FDA-DMB) PAA prepared, and the obtained Mw from GPC-MALLS and GPC-RI were 35,300 g/mol and 125,000 g/mol, respectively. Particularly, such a mobile phase is also applicable to other PAA samples with different structures, and the final results on molecular weight are also reproducible. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Polyamic%20acids" title="Polyamic acids">Polyamic acids</a>, <a href="https://publications.waset.org/abstracts/search?q=Polyelectrolyte%20effects" title=" Polyelectrolyte effects"> Polyelectrolyte effects</a>, <a href="https://publications.waset.org/abstracts/search?q=Gel%20permeation%20chromatography" title=" Gel permeation chromatography"> Gel permeation chromatography</a>, <a href="https://publications.waset.org/abstracts/search?q=Mobile%20phase" title=" Mobile phase"> Mobile phase</a>, <a href="https://publications.waset.org/abstracts/search?q=Molecular%20weight" title=" Molecular weight"> Molecular weight</a> </p> <a href="https://publications.waset.org/abstracts/173439/characterization-on-molecular-weight-of-polyamic-acids-using-gpc-coupled-with-multiple-detectors" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/173439.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">55</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">3</span> Selective Adsorption of Anionic Textile Dyes with Sustainable Composite Materials Based on Physically Activated Carbon and Basic Polyelectrolytes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mari%20Carmen%20Reyes%20Angeles">Mari Carmen Reyes Angeles</a>, <a href="https://publications.waset.org/abstracts/search?q=Dalia%20Michel%20Reyes%20Villeda"> Dalia Michel Reyes Villeda</a>, <a href="https://publications.waset.org/abstracts/search?q=Ana%20Mar%C3%ADa%20Herrera%20Gonz%C3%A1lez"> Ana María Herrera González</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work reports the design and synthesis of two composite materials based on physically activated carbon and basic polyelectrolytes useful in the adsorption of textile dyes present in aqueous solutions and wastewater. The synthesis of basic polyelectrolytes poly(2-vinylpyridine) (P2VP) and poly(4-vinylpyridine) (P4VP) was made by means of free radical polymerization. The carbon made from prickly pear peel (CarTunaF) was thermally activated in the presence of combustion gases. Composite materials CarTunaF2VP and CarTunaF4VP were obtained from CarTunaF and polybasic polyelectrolytes P2VP and P4VP with a ratio of 67:33 wt. The structure of each polyelectrolyte, P2VP, and P4VP, was elucidated by means of the FTIR and 1H NMR spectrophotometric techniques. Their thermal stability was evaluated using TGA. The characterization of CarTunaF and composite materials CarTunaF2VP and CarTunaF4VP was made by means of FTIR, TGA, SEM, and N2 adsorption. The adsorptive capacities of the polyelectrolytes and the composite materials were evaluated by adsorption of direct dyes present in aqueous solutions. The polyelectrolytes removed between 90 and 100% of the dyes, and the composite materials removed between 68 and 93% of the dyes. Using the four adsorbents P2VP, P4VP, CarTuna2VP, and CarTuna4VP, it was observed that the dyes studied, Direct Blue 80, Direct Turquoise 86, and Direct Orange 26, were adsorbed in the range between 46.1 and 188.7mg∙g-1 by means of electrostatic interactions between the anionic groups in the dyes with the cationic groups in the adsorbents. By using adsorbent materials in the treatment of wastewater from the textile industry, an improvement in the quality of the water was observed by decreasing its pH, COD, conductivity, and color considerably <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=adsorption" title="adsorption">adsorption</a>, <a href="https://publications.waset.org/abstracts/search?q=anionic%20dyes" title=" anionic dyes"> anionic dyes</a>, <a href="https://publications.waset.org/abstracts/search?q=composite" title=" composite"> composite</a>, <a href="https://publications.waset.org/abstracts/search?q=polyelectrolytes" title=" polyelectrolytes"> polyelectrolytes</a> </p> <a href="https://publications.waset.org/abstracts/152027/selective-adsorption-of-anionic-textile-dyes-with-sustainable-composite-materials-based-on-physically-activated-carbon-and-basic-polyelectrolytes" class="btn btn-primary btn-sm">Procedia</a> <a 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