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double hydroxides</title> <meta name="description" content="Search results for: layered double hydroxides"> <meta name="keywords" content="layered double hydroxides"> <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 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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="layered double hydroxides"> <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> 1581</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: layered double hydroxides</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1581</span> Synthesis, Characterization of Organic and Inorganic Zn-Al Layered Double Hydroxides and Application for the Uptake of Methyl Orange from Aqueous Solution</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fatima%20Zahra%20Mahjoubi">Fatima Zahra Mahjoubi</a>, <a href="https://publications.waset.org/abstracts/search?q=Abderrahim%20Khalidi"> Abderrahim Khalidi</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20Abdennouri"> Mohammed Abdennouri</a>, <a href="https://publications.waset.org/abstracts/search?q=Noureddine%20Barka"> Noureddine Barka</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Zn-Al layered double hydroxides containing carbonate, nitrate and dodecylsulfate as the interlamellar anions have been prepared through a coprecipitation method. The resulting compounds were characterized using XRD, ICP, FTIR, TGA/DTA, TEM/EDX and pHPZC analysis. The XRD patterns revealed that carbonate and nitrate could be intercalated into the interlayer structure with basal spacing of 22.74 and 26.56 Å respectively. Bilayer intercalation of dodecylsulfate molecules was achieved in Zn-Al LDH with a basal spacing of 37.86 Å. The TEM observation indicated that the materials synthesized via coprecipitation present nanoscale LDH particle. The average particle size of Zn-AlCO3 is 150 to 200 nm. Irregular circular to hexagonal shaped particles with 30 to 40 nm in diameter was observed in the Zn-AlNO3 morphology. TEM image of Zn-AlDs display nanostructured sheet like particles with size distribution between 5 to 10 nm. The sorption characteristics and mechanisms of methyl orange dye on organic LDH were investigated and were subsequently compared with that on the inorganic Zn-Al layered double hydroxides. Adsorption experiments for MO were carried out as function of solution pH, contact time and initial dye concentration. The adsorption behavior onto inorganic LDHs was obviously influenced by initial pH. However, the adsorption capacity of organic LDH was influenced indistinctively by initial pH and the removal percentage of MO was practically constant at various value of pH. As the MO concentration increased, the curve of adsorption capacity became L-type onto LDHs. The adsorption behavior for Zn-AlDs was proposed by the dissolution of dye in a hydrophobic interlayer region (i.e., adsolubilization). The results suggested that Zn-AlDs could be applied as a potential adsorbent for MO removal in a wide range of pH. <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=dodecylsulfate" title=" dodecylsulfate"> dodecylsulfate</a>, <a href="https://publications.waset.org/abstracts/search?q=kinetics" title=" kinetics"> kinetics</a>, <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxides" title=" layered double hydroxides"> layered double hydroxides</a>, <a href="https://publications.waset.org/abstracts/search?q=methyl%20orange%20removal" title=" methyl orange removal"> methyl orange removal</a> </p> <a href="https://publications.waset.org/abstracts/49014/synthesis-characterization-of-organic-and-inorganic-zn-al-layered-double-hydroxides-and-application-for-the-uptake-of-methyl-orange-from-aqueous-solution" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/49014.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">293</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">1580</span> Enhanced Energy Powers via Composites of Piezoelectric CH₃NH₃PbI₃ and Flexoelectric Zn-Al:Layered Double Hydroxides (LDH) Nanosheets</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Soon-Gil%20Yoon">Soon-Gil Yoon</a>, <a href="https://publications.waset.org/abstracts/search?q=Min-Ju%20Choi"> Min-Ju Choi</a>, <a href="https://publications.waset.org/abstracts/search?q=Sung-Ho%20Shin"> Sung-Ho Shin</a>, <a href="https://publications.waset.org/abstracts/search?q=Junghyo%20Nah"> Junghyo Nah</a>, <a href="https://publications.waset.org/abstracts/search?q=Jin-Seok%20Choi"> Jin-Seok Choi</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyun-A%20Song"> Hyun-A Song</a>, <a href="https://publications.waset.org/abstracts/search?q=Goeun%20Choi"> Goeun Choi</a>, <a href="https://publications.waset.org/abstracts/search?q=Jin-Ho%20Choy"> Jin-Ho Choy</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Layered double hydroxides (LDHs) with positively charged brucite-like layers and negatively charged interlayer anions are considered a critical nanoscale building block with potential for application in catalysts, biological sensors, and optical, electrical, and magnetic devices. LDHs also have a great potential as an energy conversion device, a key component in common modern electronics. Although LDHs are theoretically predicted to be centrosymmetric, we report here the first observations of the flexoelectric nature of LDHs and demonstrate their potential as an effective energy conversion material. We clearly show a linear energy conversion relationship between the output powers and curvature radius via bending with both the LDH nanosheets and thin films, revealing a direct evidence for flexoelectric effects. These findings potentially open up avenues to incorporate a flexoelectric coupling phenomenon into centrosymmetric materials such as LDHs and to harvest high-power energy using LDH nanosheets. In the present study, for enhancement of the output power, Zn-Al:LDH nanosheets were composited with piezoelectric CH3NH3PbI3 (MAPbI3) dye films and their enhanced energy harvesting was demonstrated in detail. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxides" title="layered double hydroxides">layered double hydroxides</a>, <a href="https://publications.waset.org/abstracts/search?q=flexoelectric" title=" flexoelectric"> flexoelectric</a>, <a href="https://publications.waset.org/abstracts/search?q=piezoelectric" title=" piezoelectric"> piezoelectric</a>, <a href="https://publications.waset.org/abstracts/search?q=energy%20harvesting" title=" energy harvesting "> energy harvesting </a> </p> <a href="https://publications.waset.org/abstracts/60228/enhanced-energy-powers-via-composites-of-piezoelectric-ch3nh3pbi3-and-flexoelectric-zn-allayered-double-hydroxides-ldh-nanosheets" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/60228.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">492</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">1579</span> Graphene-Oxide-Supported Coal-Layered Double Hydroxides: Synthesis and Characterizations</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shaeel%20A.%20Al%20Thabaiti">Shaeel A. Al Thabaiti</a>, <a href="https://publications.waset.org/abstracts/search?q=Sulaiman%20N.%20Basahel"> Sulaiman N. Basahel</a>, <a href="https://publications.waset.org/abstracts/search?q=Salem%20M.%20Bawaked"> Salem M. Bawaked</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Mokhtar"> Mohamed Mokhtar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nanosheets for cobalt-layered double hydroxide (Co-Al-LDH)/GO were successfully synthesized with different Co:M g:Al ratios (0:3:1, 1.5:1.5:1, and 3:0:1). The layered double hydroxide structure and morphology were determined using x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Temperature prgrammed reduction (TPR) of Co-Al-LDH showed reduction peaks at lower temperature which indicates the ease reducibility of this particular sample. The thermal behaviour was studied using thermal graviemetric technique (TG), and the BET-surface area was determined using N2 physisorption at -196°C. The C-C coupling reaction was carried out over all the investigated catalysts. The Mg–Al LDH catalyst without Co ions is inactive, but the isomorphic substitution of Mg by Co ions (Co:Mg:Al = 1.5:1.5:1) in the cationic sheet resulted in 88% conversion of iodobenzene under reflux. LDH/GO hybrid is up to 2 times higher activity than for the unsupported LDH. <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=co-precipitation" title=" co-precipitation"> co-precipitation</a>, <a href="https://publications.waset.org/abstracts/search?q=graphene%20oxide" title=" graphene oxide"> graphene oxide</a>, <a href="https://publications.waset.org/abstracts/search?q=layer%20double%20hydroxide" title=" layer double hydroxide"> layer double hydroxide</a> </p> <a href="https://publications.waset.org/abstracts/67980/graphene-oxide-supported-coal-layered-double-hydroxides-synthesis-and-characterizations" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/67980.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">301</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">1578</span> Efficient Ni(II)-Containing Layered Triple Hydroxide-Based Catalysts: Synthesis, Characterisation and Their Role in the Heck Reaction</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Gabor%20Varga">Gabor Varga</a>, <a href="https://publications.waset.org/abstracts/search?q=Krisztina%20Karadi"> Krisztina Karadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Zoltan%20Konya"> Zoltan Konya</a>, <a href="https://publications.waset.org/abstracts/search?q=Akos%20Kukovecz"> Akos Kukovecz</a>, <a href="https://publications.waset.org/abstracts/search?q=Pal%20Sipos"> Pal Sipos</a>, <a href="https://publications.waset.org/abstracts/search?q=Istvan%20Palinko"> Istvan Palinko</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nickel can efficiently replace palladium in the Heck, Suzuki and Negishi reactions. This study focuses on the synthesis and catalytic application of Ni(II)-containing layered double hydroxides (LDHs) and layered triple hydroxides (LTHs). Our goals were to incorporate Ni(II) ions among the layers of LDHs or LTHs, or binding it to their surface or building it into their layers in such a way that their catalytic activities are maintained or even increased. The LDHs and LTHs were prepared by the co-precipitation method using ethylene glycol as co-solvent. In several cases, post-synthetic modifications (e.g., thermal treatment) were performed. After optimizing the synthesis conditions, the composites displayed good crystallinity and were free of byproducts. The success of the syntheses and the post-synthetic modifications was confirmed by relevant characterization methods (XRD, SEM, SEM-EDX and combined IR techniques). Catalytic activities of the produced and well-characterized solids were investigated through the Heck reaction. The composites behaved as efficient, recyclable catalysts in the Heck reaction between 4-bromoanisole and styrene. Through varying the reaction parameters, we were able to obtain acceptable conversions under mild conditions. Our study highlights the possibility of the application of Ni(II)-containing composites as efficient catalysts in coupling reactions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxide" title="layered double hydroxide">layered double hydroxide</a>, <a href="https://publications.waset.org/abstracts/search?q=layered%20triple%20hydroxide" title=" layered triple hydroxide"> layered triple hydroxide</a>, <a href="https://publications.waset.org/abstracts/search?q=heterogeneous%20catalysis" title=" heterogeneous catalysis"> heterogeneous catalysis</a>, <a href="https://publications.waset.org/abstracts/search?q=heck%20reaction" title=" heck reaction"> heck reaction</a> </p> <a href="https://publications.waset.org/abstracts/95373/efficient-niii-containing-layered-triple-hydroxide-based-catalysts-synthesis-characterisation-and-their-role-in-the-heck-reaction" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/95373.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">174</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">1577</span> Zn-, Mg- and Ni-Al-NO₃ Layered Double Hydroxides Intercalated by Nitrate Anions for Treatment of Textile Wastewater</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fatima%20Zahra%20Mahjoubi">Fatima Zahra Mahjoubi</a>, <a href="https://publications.waset.org/abstracts/search?q=Abderrahim%20Khalidi"> Abderrahim Khalidi</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Abdennouri"> Mohamed Abdennouri</a>, <a href="https://publications.waset.org/abstracts/search?q=Omar%20Cherkaoui"> Omar Cherkaoui</a>, <a href="https://publications.waset.org/abstracts/search?q=Noureddine%20Barka"> Noureddine Barka</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Industrial effluents are one of the major causes of environmental pollution, especially effluents discharged from various dyestuff manufactures, plastic, and paper making industries. These effluents can give rise to certain hazards and environmental problems for their highly colored suspended organic solid. Dye effluents are not only aesthetic pollutants, but coloration of water by the dyes may affect photochemical activities in aquatic systems by reducing light penetration. It has been also reported that several commonly used dyes are carcinogenic and mutagenic for aquatic organisms. Therefore, removing dyes from effluents is of significant importance. Many adsorbent materials have been prepared in the removal of dyes from wastewater, including anionic clay or layered double hydroxyde. The zinc/aluminium (Zn-AlNO₃), magnesium/aluminium (Mg-AlNO₃) and nickel/aluminium (Ni-AlNO₃) layered double hydroxides (LDHs) were successfully synthesized via coprecipitation method. Samples were characterized by XRD, FTIR, TGA/DTA, TEM and pHPZC analysis. XRD patterns showed a basal spacing increase in the order of Zn-AlNO₃ (8.85Å)> Mg-AlNO₃ (7.95Å)> Ni-AlNO₃ (7.82Å). FTIR spectrum confirmed the presence of nitrate anions in the LDHs interlayer. The TEM images indicated that the Zn-AlNO3 presents circular to shaped particles with an average particle size of approximately 30 to 40 nm. Small plates assigned to sheets with hexagonal form were observed in the case of Mg-AlNO₃. Ni-AlNO₃ display nanostructured sphere in diameter between 5 and 10 nm. The LDHs were used as adsorbents for the removal of methyl orange (MO), as a model dye and for the treatment of an effluent generated by a textile factory. Adsorption experiments for MO were carried out as function of solution pH, contact time and initial dye concentration. Maximum adsorption was occurred at acidic solution pH. Kinetic data were tested using pseudo-first-order and pseudo-second-order kinetic models. The best fit was obtained with the pseudo-second-order kinetic model. Equilibrium data were correlated to Langmuir and Freundlich isotherm models. The best conditions for color and COD removal from textile effluent sample were obtained at lower values of pH. Total color removal was obtained with Mg-AlNO₃ and Ni-AlNO₃ LDHs. Reduction of COD to limits authorized by Moroccan standards was obtained with 0.5g/l LDHs dose. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=chemical%20oxygen%20demand" title="chemical oxygen demand">chemical oxygen demand</a>, <a href="https://publications.waset.org/abstracts/search?q=color%20removal" title=" color removal"> color removal</a>, <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxides" title=" layered double hydroxides"> layered double hydroxides</a>, <a href="https://publications.waset.org/abstracts/search?q=textile%20wastewater%20treatment" title=" textile wastewater treatment"> textile wastewater treatment</a> </p> <a href="https://publications.waset.org/abstracts/49021/zn-mg-and-ni-al-no3-layered-double-hydroxides-intercalated-by-nitrate-anions-for-treatment-of-textile-wastewater" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/49021.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">354</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">1576</span> Treatment of Cyanide Effluents with Platinum Impregned on Mg-Al Layered Hydroxides</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mar%C3%ADa%20R.%20Contreras">María R. Contreras</a>, <a href="https://publications.waset.org/abstracts/search?q=Diana%20Endara"> Diana Endara</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Cyanide leaching is the most used technology for gold mining industry, which produces large amounts of effluents requiring treatment. In Ecuador the development of gold mining industry has increased, causing significant environmental impacts due to the highly use of cyanide, it is estimated that 10 gr of extracted gold generates 7000 liters of water contaminated with 300mg/L of free cyanide. The most common methods used nowadays are the treatment with peroxodisulfuric acid, ozonation, H₂O₂ and other reactants which are expensive and present disadvantages. Several methods have been developed to treat this contaminant such as heterogeneous catalysts. Layered double hydroxides (LDHs) have received much attention due to their wide applications like a catalysis support. Therefore, in this study, Mg-Al/ LDH was synthetized by coprecipitation method and then platinum was impregned on it, in order to enhance its catalytic activity. Two methods of impregnation were used, the first one, called incipient wet impregnation and the second one was developed by continuous agitation of LDH in contact with chloroplatinic acid solution for 24 h. The support impregnated was analyzed by X-ray diffraction, FTIR and SEM. Finally, the oxidation of cyanide ion was performed by preparing synthetic solutions of sodium cyanide (NaCN) with an initial concentration of 500 mg/L at pH 10,5 and air flow of 180 NL/h. After 8 hours of treatment, an 80% of oxidation of ion cyanide was achieved. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=catalysis" title="catalysis">catalysis</a>, <a href="https://publications.waset.org/abstracts/search?q=cyanide" title=" cyanide"> cyanide</a>, <a href="https://publications.waset.org/abstracts/search?q=LDHs" title=" LDHs"> LDHs</a>, <a href="https://publications.waset.org/abstracts/search?q=mining" title=" mining"> mining</a> </p> <a href="https://publications.waset.org/abstracts/100903/treatment-of-cyanide-effluents-with-platinum-impregned-on-mg-al-layered-hydroxides" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/100903.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">146</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">1575</span> 2D Structured Non-Cyclic Fuzzy Graphs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=T.%20Pathinathan">T. Pathinathan</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Peter"> M. Peter</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Fuzzy graphs incorporate concepts from graph theory with fuzzy principles. In this paper, we make a study on the properties of fuzzy graphs which are non-cyclic and are of two-dimensional in structure. In particular, this paper presents 2D structure or the structure of double layer for a non-cyclic fuzzy graph whose underlying crisp graph is non-cyclic. In any graph structure, introducing 2D structure may lead to an inherent cycle. We propose relevant conditions for 2D structured non-cyclic fuzzy graphs. These conditions are extended even to fuzzy graphs of the 3D structure. General theoretical properties that are studied for any fuzzy graph are verified to 2D structured or double layered fuzzy graphs. Concepts like Order, Degree, Strong and Size for a fuzzy graph are studied for 2D structured or double layered non-cyclic fuzzy graphs. Using different types of fuzzy graphs, the proposed concepts relating to 2D structured fuzzy graphs are verified. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=double%20layered%20fuzzy%20graph" title="double layered fuzzy graph">double layered fuzzy graph</a>, <a href="https://publications.waset.org/abstracts/search?q=double%20layered%20non%E2%80%93cyclic%20fuzzy%20graph" title=" double layered non–cyclic fuzzy graph"> double layered non–cyclic fuzzy graph</a>, <a href="https://publications.waset.org/abstracts/search?q=order" title=" order"> order</a>, <a href="https://publications.waset.org/abstracts/search?q=degree%20and%20size" title=" degree and size"> degree and size</a> </p> <a href="https://publications.waset.org/abstracts/80562/2d-structured-non-cyclic-fuzzy-graphs" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/80562.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">400</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">1574</span> Synthesis of Highly Efficient Bio-Octane Number Booster Using Nano Au-NiAlZr-Layered Double Hydroxides Catalyst</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bachir%20Redouane">Bachir Redouane</a>, <a href="https://publications.waset.org/abstracts/search?q=Dib%20Nihel"> Dib Nihel</a>, <a href="https://publications.waset.org/abstracts/search?q=Bedrane%20Sumeya"> Bedrane Sumeya</a>, <a href="https://publications.waset.org/abstracts/search?q=Blanco%20Ginesa"> Blanco Ginesa</a>, <a href="https://publications.waset.org/abstracts/search?q=Calvino%20Jos%C3%A9%20Juan"> Calvino José Juan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Furfural, a key biomass-derived platform compound, holds significant potential for biofuel production and the synthesis of high-value intermediates. This study investigates the hydrogenation-condensation reaction of furfural issued from lignocellulosique biomass with isopropyl alcohol to produce isopropylfurfuryl ether (iPFE), a next-generation synfuel with a high-octane number. iPFE’s water stability and resistance to methanol absorption make it a sustainable alternative to conventional gasoline additives, offering comparable performance. The catalyst used in this reaction is based on NiAl layered double hydroxides (LDH), with zirconium incorporated to enhance the distribution and structure of active sites. Gold (Au) was deposited on the NiAlZr-LDH support to improve selectivity and yield. The addition of Zr improved the thermal and mechanical stability of the catalyst, while the Au modification further increased selectivity toward iPFE. Extensive catalytic experiments were conducted to optimize reaction conditions, including temperature, hydrogen pressure, and Au loading, to maximize iPFE yield. The results demonstrate a high conversion rate of furfural, exceeding 90% under optimal conditions, with enhanced selectivity toward iPFE. Moreover, iPFE was shown to have a higher-octane number compared to traditional furfuryl ethers, making it a highly promising candidate for advanced fuel applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Au-NiAlZr-LDH" title="Au-NiAlZr-LDH">Au-NiAlZr-LDH</a>, <a href="https://publications.waset.org/abstracts/search?q=biofuels" title=" biofuels"> biofuels</a>, <a href="https://publications.waset.org/abstracts/search?q=furfural" title=" furfural"> furfural</a>, <a href="https://publications.waset.org/abstracts/search?q=green%20chemistry" title=" green chemistry"> green chemistry</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrogenation" title=" hydrogenation"> hydrogenation</a>, <a href="https://publications.waset.org/abstracts/search?q=isopropylfurfuryl%20ether" title=" isopropylfurfuryl ether"> isopropylfurfuryl ether</a>, <a href="https://publications.waset.org/abstracts/search?q=octane%20number." title=" octane number."> octane number.</a> </p> <a href="https://publications.waset.org/abstracts/193484/synthesis-of-highly-efficient-bio-octane-number-booster-using-nano-au-nialzr-layered-double-hydroxides-catalyst" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/193484.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">12</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">1573</span> Nano-Sized Iron Oxides/ZnMe Layered Double Hydroxides as Highly Efficient Fenton-Like Catalysts for Degrading Specific Pharmaceutical Agents</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Marius%20Sebastian%20Secula">Marius Sebastian Secula</a>, <a href="https://publications.waset.org/abstracts/search?q=Mihaela%20Darie"> Mihaela Darie</a>, <a href="https://publications.waset.org/abstracts/search?q=Gabriela%20Carja"> Gabriela Carja</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Persistent organic pollutant discharged by various industries or urban regions into the aquatic ecosystems represent a serious threat to fauna and human health. The endocrine disrupting compounds are known to have toxic effects even at very low values of concentration. The anti-inflammatory agent Ibuprofen is an endocrine disrupting compound and is considered as model pollutant in the present study. The use of light energy to accomplish the latest requirements concerning wastewater discharge demands highly-performant and robust photo-catalysts. Many efforts have been paid to obtain efficient photo-responsive materials. Among the promising photo-catalysts, layered double hydroxides (LDHs) attracted significant consideration especially due to their composition flexibility, high surface area and tailored redox features. This work presents Fe(II) self-supported on ZnMeLDHs (Me =Al3+, Fe3+) as novel efficient photo-catalysts for Fenton-like catalysis. The co-precipitation method was used to prepare ZnAlLDH, ZnFeAlLDH and ZnCrLDH (Zn2+/Me3+ = 2 molar ratio). Fe(II) was self-supported on the LDHs matrices by using the reconstruction method, at two different values of weight concentration. X-ray diffraction (XRD), thermogravimetric analysis (TG/DTG), Fourier transform infrared (FTIR) and transmission electron microscopy (TEM) were used to investigate the structural, textural, and micromorphology of the catalysts. The Fe(II)/ZnMeLDHs nano-hybrids were tested for the degradation of a model pharmaceutical agent, the anti-inflammatory agent ibuprofen, by photocatalysis and photo-Fenton catalysis, respectively. The results point out that the embedment Fe(II) into ZnFeAlLDH and ZnCrLDH lead to a slight enhancement of ibuprofen degradation by light irradiation, whereas in case of ZnAlLDH, the degradation process is relatively low. A remarkable enhancement of ibuprofen degradation was found in the case of Fe(II)/ZnMeLDHs by photo-Fenton process. Acknowledgements: This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CNCS - UEFISCDI, project number PN-II-RU-TE-2014-4-0405. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxide" title="layered double hydroxide">layered double hydroxide</a>, <a href="https://publications.waset.org/abstracts/search?q=heterogeneous%20Fenton" title=" heterogeneous Fenton"> heterogeneous Fenton</a>, <a href="https://publications.waset.org/abstracts/search?q=micropollutant" title=" micropollutant"> micropollutant</a>, <a href="https://publications.waset.org/abstracts/search?q=photocatalysis" title=" photocatalysis"> photocatalysis</a> </p> <a href="https://publications.waset.org/abstracts/71114/nano-sized-iron-oxidesznme-layered-double-hydroxides-as-highly-efficient-fenton-like-catalysts-for-degrading-specific-pharmaceutical-agents" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/71114.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">295</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">1572</span> Self-Assembled ZnFeAl Layered Double Hydroxides as Highly Efficient Fenton-Like Catalysts</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Marius%20Sebastian%20Secula">Marius Sebastian Secula</a>, <a href="https://publications.waset.org/abstracts/search?q=Mihaela%20Darie"> Mihaela Darie</a>, <a href="https://publications.waset.org/abstracts/search?q=Gabriela%20Carja"> Gabriela Carja</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Ibuprofen is a non-steroidal anti-inflammatory drug (NSAIDs) and is among the most frequently detected pharmaceuticals in environmental samples and among the most widespread drug in the world. Its concentration in the environment is reported to be between 10 and 160 ng L-1. In order to improve the abatement efficiency of this compound for water source prevention and reclamation, the development of innovative technologies is mandatory. AOPs (advanced oxidation processes) are known as highly efficient towards the oxidation of organic pollutants. Among the promising combined treatments, photo-Fenton processes using layered double hydroxides (LDHs) attracted significant consideration especially due to their composition flexibility, high surface area and tailored redox features. This work presents the self-supported Fe, Mn or Ti on ZnFeAl LDHs obtained by co-precipitation followed by reconstruction method as novel efficient photo-catalysts for Fenton-like catalysis. Fe, Mn or Ti/ZnFeAl LDHs nano-hybrids were tested for the degradation of a model pharmaceutical agent, the anti-inflammatory agent ibuprofen, by photocatalysis and photo-Fenton catalysis, respectively, by means of a lab-scale system consisting of a batch reactor equipped with an UV lamp (17 W). The present study presents comparatively the degradation of Ibuprofen in aqueous solution UV light irradiation using four different types of LDHs. The newly prepared Ti/ZnFeAl 4:1 catalyst results in the best degradation performance. After 60 minutes of light irradiation, the Ibuprofen removal efficiency reaches 95%. The slowest degradation of Ibuprofen solution occurs in case of Fe/ZnFeAl 4:1 LDH, (67% removal efficiency after 60 minutes of process). Evolution of Ibuprofen degradation during the photo Fenton process is also studied using Ti/ZnFeAl 2:1 and 4:1 LDHs in the presence and absence of H2O2. It is found that after 60 min the use of Ti/ZnFeAl 4:1 LDH in presence of 100 mg/L H2O2 leads to the fastest degradation of Ibuprofen molecule. After 120 min, both catalysts Ti/ZnFeAl 4:1 and 2:1 result in the same value of removal efficiency (98%). In the absence of H2O2, Ibuprofen degradation reaches only 73% removal efficiency after 120 min of degradation process. Acknowledgements: This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CNCS - UEFISCDI, project number PN-II-RU-TE-2014-4-0405. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxide" title="layered double hydroxide">layered double hydroxide</a>, <a href="https://publications.waset.org/abstracts/search?q=advanced%20oxidation%20process" title=" advanced oxidation process"> advanced oxidation process</a>, <a href="https://publications.waset.org/abstracts/search?q=micropollutant" title=" micropollutant"> micropollutant</a>, <a href="https://publications.waset.org/abstracts/search?q=heterogeneous%20Fenton" title=" heterogeneous Fenton"> heterogeneous Fenton</a> </p> <a href="https://publications.waset.org/abstracts/71115/self-assembled-znfeal-layered-double-hydroxides-as-highly-efficient-fenton-like-catalysts" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/71115.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">229</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">1571</span> Toxic Dyes Removal in Aqueous Solution Using Calcined and Uncalcined Anionic Clay Zn/Al+Fe</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bessaha%20Hassiba">Bessaha Hassiba</a>, <a href="https://publications.waset.org/abstracts/search?q=Bouraada%20Mohamed"> Bouraada Mohamed</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Layered double hydroxide with Zn/(Al+Fe) molar ratio of 3:1 was synthesized by co-precipitation method and their calcined product was obtained by heating treatment of ZAF-HT at 500°C. The calcined and uncalcined materials were used to remove weak acid dyes: indigo carmine (IC) and green bezanyl-F2B (F2B) in aqueous solution. The synthesized materials were characterized by XRD, SEM, FTIR and TG/DTA analysis confirming the formation of pure layered structure of ZAF-HT, the destruction of the original structure after calcination and the intercalation of the dyes molecules. Moreover, the interlayer distance increases from 7.645 Å in ZAF-HT to 19.102 Å after the dyes sorption. The dose of the adsorbents was chosen 0.5 g/l while the initial concentrations were 250 and 750 mg/l for indigo carmine and green bezanyl-F2B respectively. The sorption experiments were carried out at ambient temperature and without adjusting the initial solution pH (pHi = 6.10 for IC and pHi = 5.01 for F2B). In addition, the maximum adsorption capacities obtained by ZAF-HT and CZAF for both dyes followed the order: CZAF-F2B (1501.4 mg.g-1) > CZAF-IC (617.3 mg.g-1) > ZAF-HT-IC (41.4 mg.g-1) > ZAF-HT-F2B (28.9 mg.g-1). The removal of indigo carmine and green bezanyl-F2B by ZAF-HT was due to the anion exchange and/or the adsorption on the surface. By using the calcined material (CZAF), the removal of the dyes was based on a particular property, called ‘memory effect’. CZAF recover the pristine structure in the presence anionic molecules such as acid dyes where they occupy the interlayer space. The sorption process was spontaneous in nature and followed pseudo-second-order. The isotherms showed that the removal of IC and F2B by ZAF-HT and CZAF were consistent with Langmiur model. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acid%20dyes" title="acid dyes">acid dyes</a>, <a href="https://publications.waset.org/abstracts/search?q=adsorption" title=" adsorption"> adsorption</a>, <a href="https://publications.waset.org/abstracts/search?q=calcination" title=" calcination"> calcination</a>, <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxides" title=" layered double hydroxides"> layered double hydroxides</a> </p> <a href="https://publications.waset.org/abstracts/43304/toxic-dyes-removal-in-aqueous-solution-using-calcined-and-uncalcined-anionic-clay-znalfe" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43304.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">222</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">1570</span> Fabrication of Biosensor Based on Layered Double Hydroxide/Polypyrrole/Carbon Paste Electrode for Determination of Anti-Hypertensive and Prostatic Hyperplasia Drug Terazosin</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Amira%20M.%20Hassanein">Amira M. Hassanein</a>, <a href="https://publications.waset.org/abstracts/search?q=Nehal%20A.%20Salahuddin"> Nehal A. Salahuddin</a>, <a href="https://publications.waset.org/abstracts/search?q=Atsunori%20Matsuda"> Atsunori Matsuda</a>, <a href="https://publications.waset.org/abstracts/search?q=Toshiaki%20Hattori"> Toshiaki Hattori</a>, <a href="https://publications.waset.org/abstracts/search?q=Mona%20N.%20Elfiky"> Mona N. Elfiky</a> </p> <p class="card-text"><strong>Abstract:</strong></p> New insights into the design of highly sensitive, carbon-based electrochemical sensors are presented in this work. This was achieved by exploring the interesting properties of conductive (Mg/Al) layered double hydroxide- Dodecyl Sulphate/Polypyrrole nanocomposites which were synthesized by in-situ polymerization of pyrrole during the assembly of (Mg/Al) layered double hydroxide, and by employing the anionic surfactant Dodecyl sulphate as a modifier. The morphology and surface area of the nanocomposites changed with the percentage of Pyrrole. Under optimal conditions, the modified carbon paste electrode successfully achieved detection limits of 0.057 and 0.134 nmol.L-1 of Terazosin hydrochloride in pharmaceutical formulation and spiked human serum fluid, respectively. Moreover, the sensors are highly stable, reusable, and free from interference by other commonly present excipients in drug formulations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxide" title="layered double hydroxide">layered double hydroxide</a>, <a href="https://publications.waset.org/abstracts/search?q=polypyrrole" title=" polypyrrole"> polypyrrole</a>, <a href="https://publications.waset.org/abstracts/search?q=terazosin%20hydrochloride" title=" terazosin hydrochloride"> terazosin hydrochloride</a>, <a href="https://publications.waset.org/abstracts/search?q=square-wave%20adsorptive%20anodic%20stripping%20voltammetry" title=" square-wave adsorptive anodic stripping voltammetry"> square-wave adsorptive anodic stripping voltammetry</a> </p> <a href="https://publications.waset.org/abstracts/79856/fabrication-of-biosensor-based-on-layered-double-hydroxidepolypyrrolecarbon-paste-electrode-for-determination-of-anti-hypertensive-and-prostatic-hyperplasia-drug-terazosin" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/79856.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">221</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">1569</span> Numerical Modeling Analysis for the Double-Layered Asphalt Pavement Structure Behavior with Interface Bonding</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Minh%20Tu%20Le">Minh Tu Le</a>, <a href="https://publications.waset.org/abstracts/search?q=Quang%20Huy%20Nguyen"> Quang Huy Nguyen</a>, <a href="https://publications.waset.org/abstracts/search?q=Mai%20Lan%20Nguyen"> Mai Lan Nguyen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Bonding characteristics between pavement layers have an important influence on responses of pavement structures. This paper deals with analytical solution for the stresses, strains, and deflections of double-layered asphalt pavement structure. This solution is based on the homogeneous half-space of layered theory developed by Burmister (1943). The partial interaction between the layers is taken into account by considering an interface bonding behavior which is obtained by push-out shear test. Numerical applications considering three cases of bonding (unbonded, partially bonded, and fully bonded overlays) are carried out to the influence of the interface bonding on the structural behavior of asphalt pavement under static loading. Further, it was observed that numerical results indicate that the horizontal shear reaction modulus at the interface (Ks) will significantly affect pavement structure behavior. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=analytical%20solution" title="analytical solution">analytical solution</a>, <a href="https://publications.waset.org/abstracts/search?q=interface%20bonding" title=" interface bonding"> interface bonding</a>, <a href="https://publications.waset.org/abstracts/search?q=shear%20test%20keyword" title=" shear test keyword"> shear test keyword</a>, <a href="https://publications.waset.org/abstracts/search?q=double-layered%20asphalt" title=" double-layered asphalt"> double-layered asphalt</a>, <a href="https://publications.waset.org/abstracts/search?q=shear%20reaction%20modulus" title=" shear reaction modulus"> shear reaction modulus</a> </p> <a href="https://publications.waset.org/abstracts/83012/numerical-modeling-analysis-for-the-double-layered-asphalt-pavement-structure-behavior-with-interface-bonding" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/83012.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">230</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">1568</span> Optimization of Double-Layered Microchannel Heat Sinks</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tu-Chieh%20Hung">Tu-Chieh Hung</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei-Mon%20Yan"> Wei-Mon Yan</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiao-Dong%20Wang"> Xiao-Dong Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Yu-Xian%20Huang"> Yu-Xian Huang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work employs a combined optimization procedure including a simplified conjugate-gradient method and a three-dimensional fluid flow and heat transfer model to study the optimal geometric parameter design of double-layered microchannel heat sinks. The overall thermal resistance RT is the objective function to be minimized with number of channels, N, the channel width ratio, β, the bottom channel aspect ratio, αb, and upper channel aspect ratio, αu, as the search variables. It is shown that, for the given bottom area (10 mm×10 mm) and heat flux (100 W cm-2), the optimal (minimum) thermal resistance of double-layered microchannel heat sinks is about RT=0.12 ℃/m2W with the corresponding optimal geometric parameters N=73, β=0.50, αb=3.52, and, αu= 7.21 under a constant pumping power of 0.05 W. The optimization process produces a maximum reduction by 52.8% in the overall thermal resistance compared with an initial guess (N=112, β=0.37, αb=10.32 and, αu=10.93). The results also show that the optimal thermal resistance decreases rapidly with the pumping power and tends to be a saturated value afterward. The corresponding optimal values of parameters N, αb, and αu increase while that of β decrease as the pumping power increases. However, further increasing pumping power is not always cost-effective for the application of heat sink designs. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=optimization" title="optimization">optimization</a>, <a href="https://publications.waset.org/abstracts/search?q=double-layered%20microchannel%20heat%20sink" title=" double-layered microchannel heat sink"> double-layered microchannel heat sink</a>, <a href="https://publications.waset.org/abstracts/search?q=simplified%20conjugate-gradient%20method" title=" simplified conjugate-gradient method"> simplified conjugate-gradient method</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20resistance" title=" thermal resistance"> thermal resistance</a> </p> <a href="https://publications.waset.org/abstracts/15975/optimization-of-double-layered-microchannel-heat-sinks" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15975.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">490</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">1567</span> Date Palm Wastes Turning into Biochars for Phosphorus Recovery from Aqueous Solutions: Static and Dynamic Investigations</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Salah%20Jellali">Salah Jellali</a>, <a href="https://publications.waset.org/abstracts/search?q=Nusiba%20Suliman"> Nusiba Suliman</a>, <a href="https://publications.waset.org/abstracts/search?q=Yassine%20Charabi"> Yassine Charabi</a>, <a href="https://publications.waset.org/abstracts/search?q=Jamal%20Al-Sabahi"> Jamal Al-Sabahi</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Al%20Raeesi"> Ahmed Al Raeesi</a>, <a href="https://publications.waset.org/abstracts/search?q=Malik%20Al-Wardy"> Malik Al-Wardy</a>, <a href="https://publications.waset.org/abstracts/search?q=Mejdi%20Jeguirim"> Mejdi Jeguirim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Huge amounts of agricultural biomasses are worldwide produced. At the same time, large quantities of phosphorus are annually discharged into water bodies with possible serious effects onto the environment quality. The main objective of this work is to turn a local Omani biomass (date palm fronds wastes: DPFW) into an effective material for phosphorus recovery from aqueous and the reuse of this P-loaded material in agriculture as ecofriendly amendment. For this aim, the raw DPFW were firstly impregnated with 1 M salt separated solutions of CaCl₂, MgCl₂, FeCl₃, AlCl₃, and a mixture of MgCl₂/AlCl₃ for 24 h, and then pyrolyzed under N2 flow at 500 °C for 2 hours by using an adapted tubular furnace (Carbolite, UK). The synthetized biochars were deeply characterized through specific analyses concerning their morphology, structure, texture, and surface chemistry. These analyses included the use of a scanning electron microscope (SEM) coupled with an energy-dispersive X-Ray spectrometer (EDS), X-Ray diffraction (XRD), Fourier Transform Infrared (FTIR), sorption micrometrics, and X-ray Fluorescence (XRF) apparatus. Then, their efficiency in recovering phosphorus was investigated in batch mode for various contact times (1 min to 3 h), aqueous pH values (from 3 to 11), initial phosphorus concentrations (10-100 mg/L), presence of anions (nitrates, sulfates, and chlorides). In a second step, dynamic assays, by using laboratory columns (height of 30 cm and diameter of 3 cm), were performed in order to investigate the recovery of phosphorus by the modified biochar with a mixture of Mg/Al. The effect of the initial P concentration (25-100 mg/L), the bed depth height (3 to 8 g), and the flow rate (10-30 mL/min) was assessed. Experimental results showed that the biochars physico-chemical properties were very dependent on the type of the used modifying salt. The main affected parameters concerned the specific surface area, microporosity area, and the surface chemistry (pH of zero-point charge and available functional groups). These characteristics have significantly affected the phosphorus recovery efficiency from aqueous solutions. Indeed, the P removal efficiency in batch mode varies from about 5 mg/g for the Fe-modified biochar to more than 13 mg/g for the biochar functionalized with Mg/Al layered double hydroxides. Moreover, the P recovery seems to be a time dependent process and significantly affected by the pH of the aqueous media and the presence of foreign anions due to competition phenomenon. The laboratory column study of phosphorus recovery by the biochar functionalized with Mg/Al layered double hydroxides showed that this process is affected by the used phosphorus concentration, the flow rate, and especially the column bed depth height. Indeed, the phosphorus recovered amount increased from about 4.9 to more than 9.3 mg/g used biochar mass of 3 and 8 g, respectively. This work proved that salt-modified palm fronds-derived biochars could be considered as attractive and promising materials for phosphorus recovery from aqueous solutions even under dynamic conditions. The valorization of these P-loaded-modified biochars as eco-friendly amendment for agricultural soils is necessary will promote sustainability and circular economy concepts in the management of both liquid and solid wastes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=date%20palm%20wastes" title="date palm wastes">date palm wastes</a>, <a href="https://publications.waset.org/abstracts/search?q=Mg%2FAl%20double-layered%20hydroxides%20functionalized%20biochars" title=" Mg/Al double-layered hydroxides functionalized biochars"> Mg/Al double-layered hydroxides functionalized biochars</a>, <a href="https://publications.waset.org/abstracts/search?q=phosphorus" title=" phosphorus"> phosphorus</a>, <a href="https://publications.waset.org/abstracts/search?q=recovery" title=" recovery"> recovery</a>, <a href="https://publications.waset.org/abstracts/search?q=sustainability" title=" sustainability"> sustainability</a>, <a href="https://publications.waset.org/abstracts/search?q=circular%20economy" title=" circular economy"> circular economy</a> </p> <a href="https://publications.waset.org/abstracts/156131/date-palm-wastes-turning-into-biochars-for-phosphorus-recovery-from-aqueous-solutions-static-and-dynamic-investigations" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/156131.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">81</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">1566</span> Thermal Processing of Zn-Bi Layered Double Hydroxide ZnO Doped Bismuth for a Photo-Catalytic Efficiency under Light Visible</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Benyamina%20Imane">Benyamina Imane</a>, <a href="https://publications.waset.org/abstracts/search?q=Benalioua%20Bahia"> Benalioua Bahia</a>, <a href="https://publications.waset.org/abstracts/search?q=Mansour%20Meriem"> Mansour Meriem</a>, <a href="https://publications.waset.org/abstracts/search?q=Bentouami%20Abdelhadi"> Bentouami Abdelhadi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this study is to use a synthetic route of the layered double hydroxide as a method of zinc oxide by doping a transition metal. The material is heat-treated at different temperatures then tested on the photo-fading of an acid dye indigo carmine under visible radiation compared with ZnO. The photo catalytic efficiency of Bi-ZnO in a visible light of 500 W was tested on photo-bleaching of an indigoid dye in comparison with the commercial ZnO. Indeed, a complete discoloration of indigo carmine solution of 16 mg / L was obtained after 40 and 120 minutes of irradiation in the presence of ZnO and ZnO-Bi respectively. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=LDH" title="LDH">LDH</a>, <a href="https://publications.waset.org/abstracts/search?q=POA" title=" POA"> POA</a>, <a href="https://publications.waset.org/abstracts/search?q=photo-catalysis" title=" photo-catalysis"> photo-catalysis</a>, <a href="https://publications.waset.org/abstracts/search?q=Bi-ZnO%20doping" title=" Bi-ZnO doping"> Bi-ZnO doping</a> </p> <a href="https://publications.waset.org/abstracts/33450/thermal-processing-of-zn-bi-layered-double-hydroxide-zno-doped-bismuth-for-a-photo-catalytic-efficiency-under-light-visible" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33450.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">453</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">1565</span> Optimizing Detection Methods for THz Bio-imaging Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=C.%20Bolakis">C. Bolakis</a>, <a href="https://publications.waset.org/abstracts/search?q=I.%20S.%20Karanasiou"> I. S. Karanasiou</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20Grbovic"> D. Grbovic</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20Karunasiri"> G. Karunasiri</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Uzunoglu"> N. Uzunoglu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A new approach for efficient detection of THz radiation in biomedical imaging applications is proposed. A double-layered absorber consisting of a 32 nm thick aluminum (Al) metallic layer, located on a glass medium (SiO2) of 1 mm thickness, was fabricated and used to design a fine-tuned absorber through a theoretical and finite element modeling process. The results indicate that the proposed low-cost, double-layered absorber can be tuned based on the metal layer sheet resistance and the thickness of various glass media taking advantage of the diversity of the absorption of the metal films in the desired THz domain (6 to 10 THz). It was found that the composite absorber could absorb up to 86% (a percentage exceeding the 50%, previously shown to be the highest achievable when using single thin metal layer) and reflect less than 1% of the incident THz power. This approach will enable monitoring of the transmission coefficient (THz transmission ‘’fingerprint’’) of the biosample with high accuracy, while also making the proposed double-layered absorber a good candidate for a microbolometer pixel’s active element. Based on the aforementioned promising results, a more sophisticated and effective double-layered absorber is under development. The glass medium has been substituted by diluted poly-si and the results were twofold: An absorption factor of 96% was reached and high TCR properties acquired. In addition, a generalization of these results and properties over the active frequency spectrum was achieved. Specifically, through the development of a theoretical equation having as input any arbitrary frequency in the IR spectrum (0.3 to 405.4 THz) and as output the appropriate thickness of the poly-si medium, the double-layered absorber retains the ability to absorb the 96% and reflects less than 1% of the incident power. As a result, through that post-optimization process and the spread spectrum frequency adjustment, the microbolometer detector efficiency could be further improved. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bio-imaging" title="bio-imaging">bio-imaging</a>, <a href="https://publications.waset.org/abstracts/search?q=fine-tuned%20absorber" title=" fine-tuned absorber"> fine-tuned absorber</a>, <a href="https://publications.waset.org/abstracts/search?q=fingerprint" title=" fingerprint"> fingerprint</a>, <a href="https://publications.waset.org/abstracts/search?q=microbolometer" title=" microbolometer"> microbolometer</a> </p> <a href="https://publications.waset.org/abstracts/43851/optimizing-detection-methods-for-thz-bio-imaging-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43851.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">348</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">1564</span> NiAl-Layered Double Hydroxide: Preparation, Characterization and Applications in Photo-Catalysis and Hydrogen Storage</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Farghali">Ahmed Farghali</a>, <a href="https://publications.waset.org/abstracts/search?q=Heba%20Amar"> Heba Amar</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Khedr"> Mohamed Khedr</a> </p> <p class="card-text"><strong>Abstract:</strong></p> NiAl-Layered Double Hydroxide (NiAl-LDH), one of anionic functional layered materials, has been prepared by a simple co-precipitation process. X-ray diffraction patterns confirm the formation of the desired compounds of NiAl hydroxide single phase and the crystallite size was found to be about 4.6 nm. The morphology of the prepared samples was investigated using scanning electron microscopy and the layered structure was appeared under the transmission electron microscope. The thermal stability and the function groups of NiAl-LDH were investigated using thermal gravimetric analysis (TGA) and Fourier transform infrared (FTIR) respectively. NiAl-LDH was investigated as a photo-catalyst for the degradation of some toxic dyes such as toluidine blue and bromopyrogallol red. It shows good catalytic efficiency in visible light and even in dark. For the first time NiAl-LDH was used for hydrogen storage application. NiAl-LDH samples were exposed to 20 bar applied hydrogen pressure at room temperature, 100 and -193 oC. NiAl-LDH samples appear to have feasible hydrogen storage capacity. It was capable to adsorb 0.1wt% at room temperature, 0.15 wt% at 100oC and storage capacity reached 0.3 wt% at -193 oC. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=NiAl-LDH" title="NiAl-LDH">NiAl-LDH</a>, <a href="https://publications.waset.org/abstracts/search?q=preparation" title=" preparation"> preparation</a>, <a href="https://publications.waset.org/abstracts/search?q=characterization" title=" characterization"> characterization</a>, <a href="https://publications.waset.org/abstracts/search?q=photo-catalysis" title=" photo-catalysis"> photo-catalysis</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrogen%20storage" title=" hydrogen storage"> hydrogen storage</a> </p> <a href="https://publications.waset.org/abstracts/62871/nial-layered-double-hydroxide-preparation-characterization-and-applications-in-photo-catalysis-and-hydrogen-storage" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/62871.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">1563</span> Investigation of Cost Effective Double Layered Slab for γ-Ray Shielding</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kulwinder%20Singh%20Mann">Kulwinder Singh Mann</a>, <a href="https://publications.waset.org/abstracts/search?q=Manmohan%20Singh%20Heer"> Manmohan Singh Heer</a>, <a href="https://publications.waset.org/abstracts/search?q=Asha%20Rani"> Asha Rani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The safe storage of radioactive materials has become an important issue. Nuclear engineering necessitates the safe handling of radioactive materials emitting high energy gamma-rays. Hazards involved in handling radioactive materials insist suitable shielded enclosures. With overgrowing use of nuclear energy for meeting the increasing demand of power, there is a need to investigate the shielding behavior of cost effective shielded enclosure (CESE) made from clay-bricks (CB) and fire-bricks (FB). In comparison to the lead-bricks (conventional-shielding), the CESE are the preferred choice in nuclear waste management. The objective behind the present investigation is to evaluate the double layered transmission exposure buildup factors (DLEBF) for gamma-rays for CESE in energy range 0.5-3MeV. For necessary computations of shielding parameters, using existing huge data regarding gamma-rays interaction parameters of all periodic table elements, two computer programs (GRIC-toolkit and BUF-toolkit) have been designed. It has been found that two-layered slabs show effective shielding for gamma-rays in orientation CB followed by FB than the reverse. It has been concluded that the arrangement, FB followed by CB reduces the leakage of scattered gamma-rays from the radioactive source. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=buildup%20factor" title="buildup factor">buildup factor</a>, <a href="https://publications.waset.org/abstracts/search?q=clay%20bricks" title=" clay bricks"> clay bricks</a>, <a href="https://publications.waset.org/abstracts/search?q=fire%20bricks" title=" fire bricks"> fire bricks</a>, <a href="https://publications.waset.org/abstracts/search?q=nuclear%20wastage%20management" title=" nuclear wastage management"> nuclear wastage management</a>, <a href="https://publications.waset.org/abstracts/search?q=radiation%20protective%20double%20layered%20slabs" title=" radiation protective double layered slabs"> radiation protective double layered slabs</a> </p> <a href="https://publications.waset.org/abstracts/43993/investigation-of-cost-effective-double-layered-slab-for-gh-ray-shielding" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43993.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">407</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">1562</span> The Influence of the Geogrid Layers on the Bearing Capacity of Layered Soils</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20A.%20Naeini">S. A. Naeini</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20R.%20Rahmani"> H. R. Rahmani</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Hossein%20Zade"> M. Hossein Zade</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Many classical bearing capacity theories assume that the natural soil's layers are homogenous for determining the bearing capacity of the soil. But, in many practical projects, we encounter multi-layer soils. Geosynthetic as reinforcement materials have been extensively used in the construction of various structures. In this paper, numerical analysis of the Plate Load Test (PLT) using of ABAQUS software in double-layered soils with different thicknesses of sandy and gravelly layers reinforced with geogrid was considered. The PLT is one of the common filed methods to calculate parameters such as soil bearing capacity, the evaluation of the compressibility and the determination of the Subgrade Reaction module. In fact, the influence of the geogrid layers on the bearing capacity of the layered soils is investigated. Finally, the most appropriate mode for the distance and number of reinforcement layers is determined. Results show that using three layers of geogrid with a distance of 0.3 times the width of the loading plate has the highest efficiency in bearing capacity of double-layer (sand and gravel) soils. Also, the significant increase in bearing capacity between unreinforced and reinforced soil with three layers of geogrid is caused by the condition that the upper layer (gravel) thickness is equal to the loading plate width. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bearing%20capacity" title="bearing capacity">bearing capacity</a>, <a href="https://publications.waset.org/abstracts/search?q=reinforcement" title=" reinforcement"> reinforcement</a>, <a href="https://publications.waset.org/abstracts/search?q=geogrid" title=" geogrid"> geogrid</a>, <a href="https://publications.waset.org/abstracts/search?q=plate%20load%20test" title=" plate load test"> plate load test</a>, <a href="https://publications.waset.org/abstracts/search?q=layered%20soils" title=" layered soils"> layered soils</a> </p> <a href="https://publications.waset.org/abstracts/80995/the-influence-of-the-geogrid-layers-on-the-bearing-capacity-of-layered-soils" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/80995.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">174</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">1561</span> Doping ZnO with Bi through Synthesis of Layered Double Hydroxide Application of Photo-Catalytic Degradation of Indigoid Dye in the Visible Light </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=I.%20Benyamina">I. Benyamina</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Benalioua"> B. Benalioua</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Mansour"> M. Mansour</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Bentouami"> A. Bentouami</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of this study is to use a synthetic of the layered double hydroxide as a method of doping of zinc by transition metal. The choice of dopant metal being bismuth. The material has been heat treated at different temperatures then tested on the Photo discoloration of indigo carmine under visible irradiation. In contrast, the diffuse reflectance spectroscopic analysis of the UV-visible heat treated material exhibits an absorbance in the visible unlike ZnO and TiO2 P25. This property let the photocatalytic activity of Bi-ZnO under visible irradiation. Indeed, the photocatalytic effectiveness of Bi-ZnO in a visible light was proved by the total discoloration of indigo carmine solution with intial concentration of 16 mg/L after 90 minutes, whereas the TiO2 P25 and ZnO their discolorations are obtained after 120 minutes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=photo-catalysis" title="photo-catalysis">photo-catalysis</a>, <a href="https://publications.waset.org/abstracts/search?q=doping" title=" doping"> doping</a>, <a href="https://publications.waset.org/abstracts/search?q=AOP" title=" AOP"> AOP</a>, <a href="https://publications.waset.org/abstracts/search?q=ZnO" title=" ZnO"> ZnO</a> </p> <a href="https://publications.waset.org/abstracts/24191/doping-zno-with-bi-through-synthesis-of-layered-double-hydroxide-application-of-photo-catalytic-degradation-of-indigoid-dye-in-the-visible-light" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/24191.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">370</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">1560</span> In-Situ LDH Formation of Sodium Aluminate Activated Slag</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tao%20Liu">Tao Liu</a>, <a href="https://publications.waset.org/abstracts/search?q=Qingliang%20Yu"> Qingliang Yu</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20J.%20H.%20Brouwers"> H. J. H. Brouwers</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Among the reaction products in the alkali-activated ground granulated blast furnace slag (AAS), the layered double hydroxides (LDHs) have a remarkable capacity of chloride and heavy metal ions absorption. The promotion of LDH phases in the AAS matrix can increase chloride resistance. The objective of this study is that use the different dosages of sodium aluminate to activate slag, consequently promoting the formation of in-situ LDH. The hydration kinetics of the sodium aluminate activated slag (SAAS) was tested by the isothermal calorimetry. Meanwhile, the reaction products were determined by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier-transform infrared spectroscopy (FTIR). The sodium hydroxide-activated slag is selected as the reference. The results of XRD, TGA, and FTIR showed that the formation of LDH in SAAS was increased by the aluminate dosages. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ground%20granulated%20blast%20furnace%20slag" title="ground granulated blast furnace slag">ground granulated blast furnace slag</a>, <a href="https://publications.waset.org/abstracts/search?q=sodium%20aluminate%20activated%20slag" title=" sodium aluminate activated slag"> sodium aluminate activated slag</a>, <a href="https://publications.waset.org/abstracts/search?q=in-situ%20LDH%20formation" title=" in-situ LDH formation"> in-situ LDH formation</a>, <a href="https://publications.waset.org/abstracts/search?q=chloride%20absorption" title=" chloride absorption"> chloride absorption</a> </p> <a href="https://publications.waset.org/abstracts/143331/in-situ-ldh-formation-of-sodium-aluminate-activated-slag" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/143331.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">267</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">1559</span> Electrospun Alginate Nanofibers Containing Spirulina Extract Double-Layered with Polycaprolactone Nanofibers</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Seon%20Yeong%20Byeon">Seon Yeong Byeon</a>, <a href="https://publications.waset.org/abstracts/search?q=Hwa%20Sung%20Shin"> Hwa Sung Shin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nanofibrous sheets are of interest in the beauty industries due to the properties of moisturizing, adhesion to skin and delivery of nutrient materials. The benefit and function of the cosmetic products should not be considered without safety thus a non-toxic manufacturing process is ideal when fabricating the products. In this study, we have developed cosmetic patches consisting of alginate and Spirulina extract, a marine resource which has antibacterial and antioxidant effects, without addition of harmful cross-linkers. The patches obtained their structural stabilities by layer-upon-layer electrospinning of an alginate layer on a formerly spread polycaprolactone (PCL) layer instead of crosslinking method. The morphological characteristics, release of Spirulina extract, water absorption, skin adhesiveness and cytotoxicity of the double-layered patches were assessed. The image of scanning electron microscopy (SEM) showed that the addition of Spirulina extract has made the fiber diameter of alginate layers thinner. Impregnation of Spirulina extract increased their hydrophilicity, moisture absorption ability and skin adhesive ability. In addition, wetting the pre-dried patches resulted in releasing the Spirulina extract within 30 min. The patches were detected to have no cytotoxicity in the human keratinocyte cell-based MTT assay, but rather showed increased cell viability. All the results indicate the bioactive and hydro-adhesive double-layered patches have an excellent applicability to bioproducts for personal skin care in the trend of ‘A mask pack a day’. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alginate" title="alginate">alginate</a>, <a href="https://publications.waset.org/abstracts/search?q=cosmetic%20patch" title=" cosmetic patch"> cosmetic patch</a>, <a href="https://publications.waset.org/abstracts/search?q=electrospun%20nanofiber" title=" electrospun nanofiber"> electrospun nanofiber</a>, <a href="https://publications.waset.org/abstracts/search?q=polycaprolactone" title=" polycaprolactone"> polycaprolactone</a>, <a href="https://publications.waset.org/abstracts/search?q=Spirulina%20extract" title=" Spirulina extract"> Spirulina extract</a> </p> <a href="https://publications.waset.org/abstracts/75884/electrospun-alginate-nanofibers-containing-spirulina-extract-double-layered-with-polycaprolactone-nanofibers" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/75884.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">347</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">1558</span> Determination of Nanomolar Mercury (II) by Using Multi-Walled Carbon Nanotubes Modified Carbon Zinc/Aluminum Layered Double Hydroxide – 3 (4-Methoxyphenyl) Propionate Nanocomposite Paste Electrode</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Illyas%20Md%20Isa">Illyas Md Isa</a>, <a href="https://publications.waset.org/abstracts/search?q=Sharifah%20Norain%20Mohd%20Sharif"> Sharifah Norain Mohd Sharif</a>, <a href="https://publications.waset.org/abstracts/search?q=Norhayati%20Hashima"> Norhayati Hashima</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A mercury(II) sensor was developed by using multi-walled carbon nanotubes (MWCNTs) paste electrode modified with Zn/Al layered double hydroxide-3(4-methoxyphenyl)propionate nanocomposite (Zn/Al-HMPP). The optimum conditions by cyclic voltammetry were observed at electrode composition 2.5% (w/w) of Zn/Al-HMPP/MWCNTs, 0.4 M potassium chloride, pH 4.0, and scan rate of 100 mVs-1. The sensor exhibited wide linear range from 1x10-3 M to 1x10-7 M Hg2+ and 1x10-7 M to 1x10-9 M Hg2+, with a detection limit of 1x10-10 M Hg2+. The high sensitivity of the proposed electrode towards Hg(II) was confirmed by double potential-step chronocoulometry which indicated these values; diffusion coefficient 1.5445 x 10-9 cm2 s-1, surface charge 524.5 µC s-½ and surface coverage 4.41 x 10-2 mol cm-2. The presence of 25-fold concentration of most metal ions had no influence on the anodic peak current. With characteristics such as high sensitivity, selectivity and repeatability the electrode was then proposed as the appropriate alternative for the determination of mercury(II). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cyclic%20voltammetry" title="cyclic voltammetry">cyclic voltammetry</a>, <a href="https://publications.waset.org/abstracts/search?q=mercury%28II%29" title=" mercury(II)"> mercury(II)</a>, <a href="https://publications.waset.org/abstracts/search?q=modified%20carbon%20paste%20electrode" title=" modified carbon paste electrode"> modified carbon paste electrode</a>, <a href="https://publications.waset.org/abstracts/search?q=nanocomposite" title=" nanocomposite "> nanocomposite </a> </p> <a href="https://publications.waset.org/abstracts/15881/determination-of-nanomolar-mercury-ii-by-using-multi-walled-carbon-nanotubes-modified-carbon-zincaluminum-layered-double-hydroxide-3-4-methoxyphenyl-propionate-nanocomposite-paste-electrode" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15881.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">309</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">1557</span> Preparation and Characterization of Poly (ε-caprolactone) Loaded with Layered Double Hydroxide Nanohybrid Intercalated with Alendronate for Osteoporosis Treatment</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Seyedeh%20Faranak%20Baniahmad">Seyedeh Faranak Baniahmad</a>, <a href="https://publications.waset.org/abstracts/search?q=Soroor%20Yousefi"> Soroor Yousefi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Osteoporosis is a bone disease which increases the bone fracture risk, reduces the bone mineral density (BMD) and alters the amount and variety of proteins in bones. Antiresorptive therapy is one the most popular Osteoporosis treatment methods. In this method the bisphosphonates, hormones, calcitonin or the selective estrogen receptor modulators is replaced. In order to reduce undesirable effects and to increase the bioavailability of drug agents, the controlled drug delivery systems have been utilized. In current study, the controlled release of Alendronate from LDH-PCL with (0, 5, 10, 15 % wt. of LDH) was investigated. The results showed that the release of alendronate from the lamellar LDH incorporated into the PCL matrix is much slower than the release of alendronate from the PCL. Therefore such systems are very promising, in which the antiresorptive drug has to remain in the matrix for longer time and can be released in controlled manner. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=osteoporosis" title="osteoporosis">osteoporosis</a>, <a href="https://publications.waset.org/abstracts/search?q=alendronate" title=" alendronate"> alendronate</a>, <a href="https://publications.waset.org/abstracts/search?q=poly%20%28%CE%B5%E2%80%93caprolactone%29" title=" poly (ε–caprolactone)"> poly (ε–caprolactone)</a>, <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxide" title=" layered double hydroxide"> layered double hydroxide</a> </p> <a href="https://publications.waset.org/abstracts/1526/preparation-and-characterization-of-poly-e-caprolactone-loaded-with-layered-double-hydroxide-nanohybrid-intercalated-with-alendronate-for-osteoporosis-treatment" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/1526.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">394</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">1556</span> Determination of Nanomolar Mercury (II) by Using Multi-Walled Carbon Nanotubes Modified Carbon Zinc/Aluminum Layered Double Hydroxide-3(4-Methoxyphenyl) Propionate Nanocomposite Paste Electrode</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Illyas%20Md%20Isa">Illyas Md Isa</a>, <a href="https://publications.waset.org/abstracts/search?q=Sharifah%20Norain%20Mohd%20Sharif"> Sharifah Norain Mohd Sharif</a>, <a href="https://publications.waset.org/abstracts/search?q=Norhayati%20Hashim"> Norhayati Hashim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A mercury(II) sensor was developed by using multi-walled carbon nano tubes (MWCNTs) paste electrode modified with Zn/Al layered double hydroxide-3(4-methoxyphenyl) propionate nano composite (Zn/Al-HMPP). The optimum conditions by cyclic voltammetry were observed at electrode composition 2.5% (w/w) of Zn/Al-HMPP/MWCNTs, 0.4 M potassium chloride, pH 4.0, and scan rate of 100 mVs-1. The sensor exhibited wide linear range from 1x10-3 M to 1x10-7 M Hg2+ and 1x10-7 M to 1x10-9 M Hg2+, with a detection limit of 1 x 10-10 M Hg2+. The high sensitivity of the proposed electrode towards Hg(II) was confirmed by double potential-step chronocoulometry which indicated these values; diffusion coefficient 1.5445 x 10-9 cm2 s-1, surface charge 524.5 µC s-½ and surface coverage 4.41 x 10-2 mol cm-2. The presence of 25-fold concentration of most metal ions had no influence on the anodic peak current. With characteristics such as high sensitivity, selectivity and repeatability the electrode was then proposed as the appropriate alternative for the determination of mercury. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Cyclic%20voltammetry" title="Cyclic voltammetry">Cyclic voltammetry</a>, <a href="https://publications.waset.org/abstracts/search?q=Mercury%28II%29" title=" Mercury(II)"> Mercury(II)</a>, <a href="https://publications.waset.org/abstracts/search?q=Modified%20carbon%20paste%20electrode" title=" Modified carbon paste electrode"> Modified carbon paste electrode</a>, <a href="https://publications.waset.org/abstracts/search?q=Nanocomposite" title=" Nanocomposite"> Nanocomposite</a> </p> <a href="https://publications.waset.org/abstracts/23508/determination-of-nanomolar-mercury-ii-by-using-multi-walled-carbon-nanotubes-modified-carbon-zincaluminum-layered-double-hydroxide-34-methoxyphenyl-propionate-nanocomposite-paste-electrode" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23508.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">433</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">1555</span> Pain Management in Burn Wounds with Dual Drug Loaded Double Layered Nano-Fiber Based Dressing</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sharjeel%20Abid">Sharjeel Abid</a>, <a href="https://publications.waset.org/abstracts/search?q=Tanveer%20Hussain"> Tanveer Hussain</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahsan%20Nazir"> Ahsan Nazir</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdul%20Zahir"> Abdul Zahir</a>, <a href="https://publications.waset.org/abstracts/search?q=Nabyl%20Khenoussi"> Nabyl Khenoussi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Localized application of drug has various advantages and fewer side effects as compared with other methods. Burn patients suffer from swear pain and the major aspects that are considered for burn victims include pain and infection management. Nano-fibers (NFs) loaded with drug, applied on local wound area, can solve these problems. Therefore, this study dealt with the fabrication of drug loaded NFs for better pain management. Two layers of NFs were fabricated with different drugs. Contact layer was loaded with Gabapentin (a nerve painkiller) and the second layer with acetaminophen. The fabricated dressing was characterized using scanning electron microscope, Fourier Transform Infrared Spectroscopy, X-Ray Diffraction and UV-Vis Spectroscopy. The double layered based NFs dressing was designed to have both initial burst release followed by slow release to cope with pain for two days. The fabricated nanofibers showed diameter < 300 nm. The liquid absorption capacity of the NFs was also checked to deal with the exudate. The fabricated double layered dressing with dual drug loading and release showed promising results that could be used for dealing pain in burn victims. It was observed that by the addition of drug, the size of nanofibers was reduced, on the other hand, the crystallinity %age was increased, and liquid absorption decreased. The combination of fast nerve pain killer release followed by slow release of non-steroidal anti-inflammatory drug could be a good tool to reduce pain in a more secure manner with fewer side effects. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=pain%20management" title="pain management">pain management</a>, <a href="https://publications.waset.org/abstracts/search?q=burn%20wounds" title=" burn wounds"> burn wounds</a>, <a href="https://publications.waset.org/abstracts/search?q=nano-fibers" title=" nano-fibers"> nano-fibers</a>, <a href="https://publications.waset.org/abstracts/search?q=controlled%20drug%20release" title=" controlled drug release"> controlled drug release</a> </p> <a href="https://publications.waset.org/abstracts/94600/pain-management-in-burn-wounds-with-dual-drug-loaded-double-layered-nano-fiber-based-dressing" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/94600.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">253</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">1554</span> Co₂Fe LDH on Aromatic Acid Functionalized N Doped Graphene: Hybrid Electrocatalyst for Oxygen Evolution Reaction</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Biswaranjan%20D.%20Mohapatra">Biswaranjan D. Mohapatra</a>, <a href="https://publications.waset.org/abstracts/search?q=Ipsha%20Hota"> Ipsha Hota</a>, <a href="https://publications.waset.org/abstracts/search?q=Swarna%20P.%20Mantry"> Swarna P. Mantry</a>, <a href="https://publications.waset.org/abstracts/search?q=Nibedita%20Behera"> Nibedita Behera</a>, <a href="https://publications.waset.org/abstracts/search?q=Kumar%20S.%20K.%20Varadwaj"> Kumar S. K. Varadwaj</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Designing highly active and low-cost oxygen evolution (2H₂O → 4H⁺ + 4e⁻ + O₂) electrocatalyst is one of the most active areas of advanced energy research. Some precious metal-based electrocatalysts, such as IrO₂ and RuO₂, have shown excellent performance for oxygen evolution reaction (OER); however, they suffer from high-cost and low abundance which limits their applications. Recently, layered double hydroxides (LDHs), composed of layers of divalent and trivalent transition metal cations coordinated to hydroxide anions, have gathered attention as an alternative OER catalyst. However, LDHs are insulators and coupled with carbon materials for the electrocatalytic applications. Graphene covalently doped with nitrogen has been demonstrated to be an excellent electrocatalyst for energy conversion technologies such as; oxygen reduction reaction (ORR), oxygen evolution reaction (OER) & hydrogen evolution reaction (HER). However, they operate at high overpotentials, significantly above the thermodynamic standard potentials. Recently, we reported remarkably enhanced catalytic activity of benzoate or 1-pyrenebutyrate functionalized N-doped graphene towards the ORR in alkaline medium. The molecular and heteroatom co-doping on graphene is expected to tune the electronic structure of graphene. Therefore, an innovative catalyst architecture, in which LDHs are anchored on aromatic acid functionalized ‘N’ doped graphene may presumably boost the OER activity to a new benchmark. Herein, we report fabrication of Co₂Fe-LDH on aromatic acid (AA) functionalized ‘N’ doped reduced graphene oxide (NG) and studied their OER activities in alkaline medium. In the first step, a novel polyol method is applied for synthesis of AA functionalized NG, which is well dispersed in aqueous medium. In the second step, Co₂Fe LDH were grown on AA functionalized NG by co-precipitation method. The hybrid samples are abbreviated as Co₂Fe LDH/AA-NG, where AA is either Benzoic acid or 1, 3-Benzene dicarboxylic acid (BDA) or 1, 3, 5 Benzene tricarboxylic acid (BTA). The crystal structure and morphology of the samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). These studies confirmed the growth of layered single phase LDH. The electrocatalytic OER activity of these hybrid materials was investigated by rotating disc electrode (RDE) technique on a glassy carbon electrode. The linear sweep voltammetry (LSV) on these catalyst samples were taken at 1600rpm. We observed significant OER performance enhancement in terms of onset potential and current density on Co₂Fe LDH/BTA-NG hybrid, indicating the synergic effect. This exploration of molecular functionalization effect in doped graphene and LDH system may provide an excellent platform for innovative design of OER catalysts. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=%CF%80-%CF%80%20functionalization" title="π-π functionalization">π-π functionalization</a>, <a href="https://publications.waset.org/abstracts/search?q=layered%20double%20hydroxide" title=" layered double hydroxide"> layered double hydroxide</a>, <a href="https://publications.waset.org/abstracts/search?q=oxygen%20evolution%20reaction" title=" oxygen evolution reaction"> oxygen evolution reaction</a>, <a href="https://publications.waset.org/abstracts/search?q=reduced%20graphene%20oxide" title=" reduced graphene oxide"> reduced graphene oxide</a> </p> <a href="https://publications.waset.org/abstracts/80658/co2fe-ldh-on-aromatic-acid-functionalized-n-doped-graphene-hybrid-electrocatalyst-for-oxygen-evolution-reaction" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/80658.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">207</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">1553</span> Physicochemical Characterization of Low Sulfonated Polyether Ether Ketone/ Layered Double Hydroxide/Sepiolite Hybrid to Improve the Performance of Sulfonated Poly Ether Ether Ketone Composite Membranes for Proton Exchange Membrane Fuel Cells</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zakaria%20Ahmed">Zakaria Ahmed</a>, <a href="https://publications.waset.org/abstracts/search?q=Khaled%20Charradi"> Khaled Charradi</a>, <a href="https://publications.waset.org/abstracts/search?q=Sherif%20M.%20A.%20S.%20%20Keshk"> Sherif M. A. S. Keshk</a>, <a href="https://publications.waset.org/abstracts/search?q=Radhouane%20Chtourou"> Radhouane Chtourou</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Sulfonated poly ether ether ketone (SPEEK) with a low sulfonation degree was blended using nanofiller Layered Double Hydroxide (LDH, Mg2AlCl) /sepiolite nanostructured material as additive to use as an electrolyte membrane for fuel cell application. Characterization assessments, i.e., mechanical stability, thermal gravimetric analysis, ion exchange capability, swelling properties, water uptake capacities, electrochemical impedance spectroscopy analysis, and Fourier transform infrared spectroscopy (FTIR) of the composite membranes were conducted. The presence of LDH/sepiolite nanoarchitecture material within SPEEK was found to have the highest water retention and proton conductivity value at high temperature rather than LDH/SPEEK and pristine SPEEK membranes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=SPEEK" title="SPEEK">SPEEK</a>, <a href="https://publications.waset.org/abstracts/search?q=sepiolite%20clay" title=" sepiolite clay"> sepiolite clay</a>, <a href="https://publications.waset.org/abstracts/search?q=LDH%20clay" title=" LDH clay"> LDH clay</a>, <a href="https://publications.waset.org/abstracts/search?q=proton%20exchange%20membrane" title=" proton exchange membrane"> proton exchange membrane</a> </p> <a href="https://publications.waset.org/abstracts/132896/physicochemical-characterization-of-low-sulfonated-polyether-ether-ketone-layered-double-hydroxidesepiolite-hybrid-to-improve-the-performance-of-sulfonated-poly-ether-ether-ketone-composite-membranes-for-proton-exchange-membrane-fuel-cells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/132896.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">123</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">1552</span> Shear Elastic Waves in Disordered Anisotropic Multi-Layered Periodic Structure</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=K.%20B.%20Ghazaryan">K. B. Ghazaryan</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20A.%20Ghazaryan"> R. A. Ghazaryan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Based on the constitutive model and anti-plane equations of anisotropic elastic body of monoclinic symmetry we consider the problem of shear wave propagation in multi-layered disordered composite structure with point defect. Using transfer matrix method the analytic expression is obtained providing solutions of shear Floquet wave propagation in periodic disordered anisotropic structure. The usefulness of the obtained analytical expression was discussed also in reflection and refraction problems from multi-layered reflector as well as in vibration problem of multi-layered waveguides. Numerical results are presented highlighting the effects arising in disordered periodic structure due to defects of multi-layered structure. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=shear%20elastic%20waves" title="shear elastic waves">shear elastic waves</a>, <a href="https://publications.waset.org/abstracts/search?q=monoclinic%20anisotropic%20media" title=" monoclinic anisotropic media"> monoclinic anisotropic media</a>, <a href="https://publications.waset.org/abstracts/search?q=periodic%20structure" title=" periodic structure"> periodic structure</a>, <a href="https://publications.waset.org/abstracts/search?q=disordered%20multilayer%20laminae" title=" disordered multilayer laminae"> disordered multilayer laminae</a>, <a href="https://publications.waset.org/abstracts/search?q=multi-layered%20waveguide" title=" multi-layered waveguide"> multi-layered waveguide</a> </p> <a 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