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alumina</title> <meta name="description" content="Search results for: alumina"> <meta name="keywords" content="alumina"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler ml-auto" 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class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="alumina"> <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> 215</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: alumina</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">215</span> Preparation and Characterization of α–Alumina with Low Sodium Oxide</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Gyung%20Soo%20Jeon">Gyung Soo Jeon</a>, <a href="https://publications.waset.org/abstracts/search?q=Hong%20Bae%20Kim"> Hong Bae Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Chi%20Jung%20Oh"> Chi Jung Oh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to prepare the α-alumina with low content of sodium oxide from aluminum trihydroxide as a reactant, three kinds of methods were employed as follows; the mixture of Chamotte (aggregate composed of silica and alumina), ammonium chloride and aluminum fluoride with aluminum trihydroxide under 1600°C, respectively. The sodium oxide in α-alumina produced above methods was analyzed by XRF and the particle size distribution was determined by particle size analyzer, and the specific surface area of α-alumina was measured by BET method, and phase of α-alumina produced was confirmed by XRD. Acknowledgement: This research was supported by Development Program of Technical Innovation funded by Korea Technology and Information Promotion Agency for SMEs (KTIP-2016-S2401821). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=%CE%B1-alumina" title="α-alumina">α-alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=sodium%20oxide" title=" sodium oxide"> sodium oxide</a>, <a href="https://publications.waset.org/abstracts/search?q=aluminum%20trihydroxide" title=" aluminum trihydroxide"> aluminum trihydroxide</a>, <a href="https://publications.waset.org/abstracts/search?q=Chamotte" title=" Chamotte"> Chamotte</a>, <a href="https://publications.waset.org/abstracts/search?q=ammonium%20chloride" title=" ammonium chloride"> ammonium chloride</a>, <a href="https://publications.waset.org/abstracts/search?q=aluminum%20fluoride" title=" aluminum fluoride"> aluminum fluoride</a> </p> <a href="https://publications.waset.org/abstracts/66138/preparation-and-characterization-of-a-alumina-with-low-sodium-oxide" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/66138.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">315</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">214</span> Percentages of Alumina Phase and Different Ph on The Ha- Al2o3 Nano Composite</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Tayyebi">S. Tayyebi</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20Mirjalili"> F. Mirjalili</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Samadi"> H. Samadi</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Nemati"> A. Nemati</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, hydroxyapatite-Alumina nano composite powder, containing 15,20 and 25% weight percent of reinforced alumina were prepared by chemical precipitation from the reaction between calcium nitrate tetrahydrate and di-ammonium hydrogen phosphate with ratio of Ca / p = 1.67 and different percentage of aluminum nitrate nona hydrate in different pH of 9,10 and 11. The microstructure and thermal stability of samples were measured by X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM). The results showed that the presence of reinforced alumina phase reduced the degree of crystallinity of hydroxyapatite phase and increased its decomposition to tricalcium phosphate phase. Microstructural analysis showed that the hydroxyapatite-alumina nano composite powder was obtained with spherical shape and size of less than 100 nm. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=biomaterial" title="biomaterial">biomaterial</a>, <a href="https://publications.waset.org/abstracts/search?q=hydroxyapatite" title=" hydroxyapatite"> hydroxyapatite</a>, <a href="https://publications.waset.org/abstracts/search?q=alumina" title=" alumina"> alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=nano%20composite" title=" nano composite"> nano composite</a>, <a href="https://publications.waset.org/abstracts/search?q=precipitation%20method" title=" precipitation method"> precipitation method</a> </p> <a href="https://publications.waset.org/abstracts/31034/percentages-of-alumina-phase-and-different-ph-on-the-ha-al2o3-nano-composite" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31034.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">534</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">213</span> Properties of Hot-Pressed Alumina-Graphene Composites</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=P.%20Rutkowski">P. Rutkowski</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20G%C3%B3rny"> G. Górny</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Stobierski"> L. Stobierski</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20Zientara"> D. Zientara</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Piekarczyk"> W. Piekarczyk</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Tran"> K. Tran</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The polycrystalline dense alumina shows thermal conductivity about 30 W/mK and very high electrical resistivity. These last two properties can be modified by introducing commercial relatively cheap graphene nanoparticles which, as two-dimensional flakes show very high thermal and electrical properties. The aim of this work is to show that it is possible to manufacture the anisotropic alumina-graphene material with directed multilayer graphene particles. Such materials can show the anisotropic properties mentioned before. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina" title="alumina">alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=composite" title=" composite"> composite</a>, <a href="https://publications.waset.org/abstracts/search?q=hot-pressed" title=" hot-pressed"> hot-pressed</a>, <a href="https://publications.waset.org/abstracts/search?q=graphene" title=" graphene"> graphene</a>, <a href="https://publications.waset.org/abstracts/search?q=properties" title=" properties"> properties</a> </p> <a href="https://publications.waset.org/abstracts/40596/properties-of-hot-pressed-alumina-graphene-composites" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40596.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">273</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">212</span> A Study of the Alumina Distribution in the Lab-Scale Cell during Aluminum Electrolysis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Olga%20Tkacheva">Olga Tkacheva</a>, <a href="https://publications.waset.org/abstracts/search?q=Pavel%20Arkhipov"> Pavel Arkhipov</a>, <a href="https://publications.waset.org/abstracts/search?q=Alexey%20Rudenko"> Alexey Rudenko</a>, <a href="https://publications.waset.org/abstracts/search?q=Yurii%20Zaikov"> Yurii Zaikov</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aluminum electrolysis process in the conventional cryolite-alumina electrolyte with cryolite ratio of 2.7 was carried out at an initial temperature of 970 °C and the anode current density of 0.5 A/cm<sup>2</sup> in a 15A lab-scale cell in order to study the formation of the side ledge during electrolysis and the alumina distribution between electrolyte and side ledge. The alumina contained 35.97% α-phase and 64.03% γ-phase with the particles size in the range of 10-120 μm. The cryolite ratio and the alumina concentration were determined in molten electrolyte during electrolysis and in frozen bath after electrolysis. The side ledge in the electrolysis cell was formed only by the 13<sup>th</sup> hour of electrolysis. With a slight temperature decrease a significant increase in the side ledge thickness was observed. The basic components of the side ledge obtained by the XRD phase analysis were Na<sub>3</sub>AlF<sub>6</sub>, Na<sub>5</sub>Al<sub>3</sub>F<sub>14</sub>, Al<sub>2</sub>O<sub>3</sub>, and NaF<sup>.</sup>5CaF<sub>2</sub><sup>.</sup>AlF<sub>3</sub>. As in the industrial cell, the increased alumina concentration in the side ledge formed on the cell walls and at the ledge-electrolyte-aluminum three-phase boundary during aluminum electrolysis in the lab cell was found (FTP No 05.604.21.0239, IN RFMEFI60419X0239). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina%20distribution" title="alumina distribution">alumina distribution</a>, <a href="https://publications.waset.org/abstracts/search?q=aluminum%20electrolyzer" title=" aluminum electrolyzer"> aluminum electrolyzer</a>, <a href="https://publications.waset.org/abstracts/search?q=cryolie-alumina%20electrolyte" title=" cryolie-alumina electrolyte"> cryolie-alumina electrolyte</a>, <a href="https://publications.waset.org/abstracts/search?q=side%20ledge" title=" side ledge"> side ledge</a> </p> <a href="https://publications.waset.org/abstracts/118301/a-study-of-the-alumina-distribution-in-the-lab-scale-cell-during-aluminum-electrolysis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/118301.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">273</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">211</span> The Impact of Alumina Cement on Properties of Portland Cement Slurries and Mortars</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Krzysztof%20Zieli%C5%84ski">Krzysztof Zieliński</a>, <a href="https://publications.waset.org/abstracts/search?q=Dariusz%20Kierzek"> Dariusz Kierzek</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The addition of a small amount of alumina cement to Portland cement results in immediate setting, a rapid increase in the compressive strength and a clear increase of the adhesion to concrete substrate. This phenomenon is used, among others, for the production of liquid floor self-levelling compounds. Alumina cement is several times more expensive than Portland cement and is a component having a significant impact on prices of products manufactured with its use. For the production of liquid floor self-levelling compounds, low-alumina cement containing approximately 40% Al<sub>2</sub>O<sub>3 </sub>is normally used. The aim of the study was to determine the impact of Portland cement with the addition of alumina cement on the basic physical and mechanical properties of cement slurries and mortars. CEM I 42.5R and three types of alumina cement containing 40%, 50% and 70% of Al<sub>2</sub>O<sub>3</sub> were used for the tests. Mixes containing 4%, 6%, 8%, 10% and 12% of different varieties of alumina cement were prepared; for which, the time of initial and final setting, compressive and flexural strength and adhesion to concrete substrate were determined. The analysis of the obtained test results showed that a similar immediate setting effect and clearly better adhesion strength can be obtained using the addition of 6% of high-alumina cement than 12% of low-alumina cement. As the prices of these cements are similar, this can give significant financial savings in the production of liquid floor self-levelling compounds. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina%20cement" title="alumina cement">alumina cement</a>, <a href="https://publications.waset.org/abstracts/search?q=immediate%20setting" title=" immediate setting"> immediate setting</a>, <a href="https://publications.waset.org/abstracts/search?q=compression%20strength" title=" compression strength"> compression strength</a>, <a href="https://publications.waset.org/abstracts/search?q=adhesion%20to%20substrate" title=" adhesion to substrate"> adhesion to substrate</a> </p> <a href="https://publications.waset.org/abstracts/118238/the-impact-of-alumina-cement-on-properties-of-portland-cement-slurries-and-mortars" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/118238.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">152</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">210</span> Nanowire by Ac Electrodeposition Into Nanoporous Alumina Fabrication of High Aspect Ratio Metalic</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Beyzaiea">M. Beyzaiea</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Mohammadia"> S. Mohammadia</a> </p> <p class="card-text"><strong>Abstract:</strong></p> High aspect ratio metallic (silver, cobalt) nanowire arrays were fabricated using ac electrodeposition techniques into the nanoporous alumina template. The template with long pore dept fabricated by hard anodization (HA) and thinned for ac electrodeposition. Template preparation was done in short time by using HA technique and high speed thing process. The TEM and XRD investigation confirm the three dimensional nucleation growth mechanism of metallic nanowire inside the nanoporous alumina that fabricated by HA process. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=metallic" title="metallic">metallic</a>, <a href="https://publications.waset.org/abstracts/search?q=nanowire" title=" nanowire"> nanowire</a>, <a href="https://publications.waset.org/abstracts/search?q=nanoporous%20alumina" title=" nanoporous alumina"> nanoporous alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=ac%20electrodeposition" title=" ac electrodeposition"> ac electrodeposition</a> </p> <a href="https://publications.waset.org/abstracts/43733/nanowire-by-ac-electrodeposition-into-nanoporous-alumina-fabrication-of-high-aspect-ratio-metalic" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43733.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">273</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">209</span> Comparison of Catalyst Support for High Pressure Reductive Amination</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tz-Bang%20Du">Tz-Bang Du</a>, <a href="https://publications.waset.org/abstracts/search?q=Cheng-Han%20Hsieh"> Cheng-Han Hsieh</a>, <a href="https://publications.waset.org/abstracts/search?q=Li-Ping%20Ju"> Li-Ping Ju</a>, <a href="https://publications.waset.org/abstracts/search?q=Hung-Jie%20Liou"> Hung-Jie Liou</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Polyether amines synthesize by secondary hydroxyl polyether diol play an important role in epoxy hardener. The low molecular weight product is used in low viscosity and high transparent polyamine product for the logo, ground cover, especially for wind turbine blade, while the high molecular weight products are used in advanced agricultures such as a high-speed railway. High-pressure reductive amination process is required for producing these amines. In the condition of higher than 150 atm pressure and 200 degrees Celsius temperature, supercritical ammonia is used as a reactant and also a solvent. It would be a great challenge to select a catalyst support for such high-temperature alkaline circumstance. In this study, we have established a six-autoclave-type (SAT) high-pressure reactor for amination catalyst screening, which six experiment conditions with different temperature and pressure could be examined at the same time. We synthesized copper-nickel catalyst on different shaped alumina catalyst support and evaluated the catalyst activity for high-pressure reductive amination of polypropylene glycol (PPG) by SAT reactor. Ball type gamma alumina, ball type activated alumina and pellet type gamma alumina catalyst supports are evaluated in this study. Gamma alumina supports have shown better activity on PPG reductive amination than activated alumina support. In addition, the catalysts are evaluated in fixed bed reactor. The diamine product was successfully synthesized via this catalyst and the strength of the catalysts is measured. The crush strength of blank supports is about 13.5 lb for both gamma alumina and activated alumina. The strength increases to 20.3 lb after synthesized to be copper-nickel catalyst. After test in the fixed bed high-pressure reductive amination process for 100 hours, the crush strength of the used catalyst is 3.7 lb for activated alumina support, 12.0 lb for gamma alumina support. The gamma alumina is better than activated alumina to use as catalyst support in high-pressure reductive amination process. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=high%20pressure%20reductive%20amination" title="high pressure reductive amination">high pressure reductive amination</a>, <a href="https://publications.waset.org/abstracts/search?q=copper%20nickel%20catalyst" title=" copper nickel catalyst"> copper nickel catalyst</a>, <a href="https://publications.waset.org/abstracts/search?q=polyether%20amine" title=" polyether amine"> polyether amine</a>, <a href="https://publications.waset.org/abstracts/search?q=alumina" title=" alumina"> alumina</a> </p> <a href="https://publications.waset.org/abstracts/47166/comparison-of-catalyst-support-for-high-pressure-reductive-amination" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/47166.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">208</span> The Effect of Volume Fraction of Nano-Alumina Strengthening on AC4B Composite Characteristics through the Stir Casting Method as a Material Brake Shoe</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Benny%20Alexander">Benny Alexander</a>, <a href="https://publications.waset.org/abstracts/search?q=Ikhlashia%20N.%20Fadhilah"> Ikhlashia N. Fadhilah</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20R.%20Pasha"> Muhammad R. Pasha</a>, <a href="https://publications.waset.org/abstracts/search?q=Michelle%20Julia"> Michelle Julia</a>, <a href="https://publications.waset.org/abstracts/search?q=Anne%20Z.%20Syahrial"> Anne Z. Syahrial</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Brake shoe is a component that serves to reduce speed or stop the train's speed by utilizing the friction force. Generally, the material used as a brake shoe is cast iron, where cast iron itself is a heavy, expensive, and easily worn material. Aluminum matrix composites are one of candidates for the cast iron replacement material as the basic material for brake shoe. The matrix in the composite used is Aluminum AC4B. Reinforcement used in aluminum matrix composites is nano-alumina, where the use of nano-alumina of 0.25%, 0.3%, 0.35%, 0.4%, and 0.5% volume fraction will be tested. The sample is made using the stir casting method; then, it will be tested mechanically. The use of nano-alumina as a reinforcement will increase the strength of the matrix. SEM (scanning electron microscopy) testing is used to test the distribution of reinforcing particles due to stirring. Therefore, the addition of nano-alumina will improve AC4B aluminum matrix composites. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aluminium%20matrix%20composites" title="aluminium matrix composites">aluminium matrix composites</a>, <a href="https://publications.waset.org/abstracts/search?q=brake%20shoe%20application" title=" brake shoe application"> brake shoe application</a>, <a href="https://publications.waset.org/abstracts/search?q=stir%20casting" title=" stir casting"> stir casting</a>, <a href="https://publications.waset.org/abstracts/search?q=nano-alumina" title=" nano-alumina"> nano-alumina</a> </p> <a href="https://publications.waset.org/abstracts/125019/the-effect-of-volume-fraction-of-nano-alumina-strengthening-on-ac4b-composite-characteristics-through-the-stir-casting-method-as-a-material-brake-shoe" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/125019.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">132</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">207</span> Alumina Nanoparticles in One-Pot Synthesis of Pyrazolopyranopyrimidinones</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Saeed%20Khodabakhshi">Saeed Khodabakhshi</a>, <a href="https://publications.waset.org/abstracts/search?q=Alimorad%20Rashidi"> Alimorad Rashidi</a>, <a href="https://publications.waset.org/abstracts/search?q=Ziba%20Tavakoli"> Ziba Tavakoli</a>, <a href="https://publications.waset.org/abstracts/search?q=Sajad%20Kiani"> Sajad Kiani</a>, <a href="https://publications.waset.org/abstracts/search?q=Sadegh%20Dastkhoon"> Sadegh Dastkhoon</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Alumina nanoparticles (γ-Al2O3 NPs) were prepared via a new and simple synthetic route and characterized by field emission scanning electron microscope, X-ray diffraction, and Fourier transform infrared spectroscopy. The catalytic activity of prepared γ-Al2O3 NPs was investigated for the one-pot, four-component synthesis of fused tri-heterocyclic compounds containing pyrazole, pyran, and pyrimidine. This procedure has some advantages such as high efficiency, simplicity, high rate and environmental safety. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina%20nanoparticles" title="alumina nanoparticles">alumina nanoparticles</a>, <a href="https://publications.waset.org/abstracts/search?q=one-pot" title=" one-pot"> one-pot</a>, <a href="https://publications.waset.org/abstracts/search?q=fused%20tri-heterocyclic%20compounds" title=" fused tri-heterocyclic compounds"> fused tri-heterocyclic compounds</a>, <a href="https://publications.waset.org/abstracts/search?q=pyran" title=" pyran"> pyran</a> </p> <a href="https://publications.waset.org/abstracts/44094/alumina-nanoparticles-in-one-pot-synthesis-of-pyrazolopyranopyrimidinones" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/44094.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">332</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">206</span> Synthesis of Ni/Mesopore Silica-Alumina Catalyst for Hydrocracking of Pyrolyzed α-Cellulose</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Wega%20Trisunaryanti">Wega Trisunaryanti</a>, <a href="https://publications.waset.org/abstracts/search?q=Hesty%20Kusumastuti"> Hesty Kusumastuti</a>, <a href="https://publications.waset.org/abstracts/search?q=Iip%20Izul%20Falah"> Iip Izul Falah</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Fajar%20Marsuki"> Muhammad Fajar Marsuki</a>, <a href="https://publications.waset.org/abstracts/search?q=Rahmad%20Nuryanto"> Rahmad Nuryanto</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Synthesis of Ni supported on mesopore silica-alumina (MSA) for hydrocracking of pyrolyzed α-cellulose had been carried out. The silica and alumina were extracted from Sidoarjo mud. Gelatin from catfish bone was used as a template for the mesopore design. The MSA was synthesized by using hydrothermal method at 100 °C for 24 h and calcined at 550 °C for 4 h then characterized by using X-Ray Diffraction Spectrometer (XRD) and Nitrogen Gas Sorption Analyzer (GAS). The Ni metal was loaded to the MSA by wet impregnation method. The catalytic activity in the hydrocracking reaction of pyrolyzed α-cellulose was carried out at 450 °C for 2 h. The MSA synthesized in this work is an amorphous material with specific surface area, total pore volume, and average pore diameter of 212.29 m²/g, 1.29 cm³/g, and 20.05 nm, respectively. The Ni/MSA catalyst produced 73.02 wt.% of liquid product in hydrocracking of pyrolyzed α-cellulose. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=catalyst" title="catalyst">catalyst</a>, <a href="https://publications.waset.org/abstracts/search?q=gelatin" title=" gelatin"> gelatin</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrocracking" title=" hydrocracking"> hydrocracking</a>, <a href="https://publications.waset.org/abstracts/search?q=mesopore%20silica-alumina" title=" mesopore silica-alumina"> mesopore silica-alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=%CE%B1-cellulose" title=" α-cellulose"> α-cellulose</a> </p> <a href="https://publications.waset.org/abstracts/84532/synthesis-of-nimesopore-silica-alumina-catalyst-for-hydrocracking-of-pyrolyzed-a-cellulose" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/84532.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">163</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">205</span> Preparation of Alumina (Al2O3) Particles and MMCS of (Al-7% Si– 0.45% Mg) Alloy Using Vortex Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Abdulmagid%20A.%20Khattabi">Abdulmagid A. Khattabi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of this research is to study the manner of alumina (Al2O3) particles dispersion with (2-10) mm size in (Al-7%Si-0.45% Mg) base of alloy melt employing of classical casting method. The mechanism of particles diffusions by melt turning and stirring that makes vortexes help the particles entrance in the matrix of base alloy also has been studied. The samples of metallic composites (MMCs) with dispersed particles percentages (4% - 6% - 8% - 10% - 15% and 20%) are prepared. The effect of the particles dispersion on the mechanical properties of produced samples were carried out by tension & hardness tests. It is found that the ultimate tensile strength of the produced composites can be increased by increasing the percentages of alumina particles in the matrix of the base alloy. It becomes (232 Mpa) at (20%) of added particles. The results showed that the average hardness of prepared samples increasing with increases the alumina content. Microstructure study of prepared samples was carried out. The results showed particles location and distribution of it in the matrix of base alloy. The dissolution of Alumina particles into liquid base alloy was clear in some cases. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=base%20alloy" title="base alloy">base alloy</a>, <a href="https://publications.waset.org/abstracts/search?q=matrix" title=" matrix"> matrix</a>, <a href="https://publications.waset.org/abstracts/search?q=hardness" title=" hardness"> hardness</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20properties" title=" thermal properties"> thermal properties</a>, <a href="https://publications.waset.org/abstracts/search?q=base%20metal%20MMCs" title=" base metal MMCs "> base metal MMCs </a> </p> <a href="https://publications.waset.org/abstracts/11123/preparation-of-alumina-al2o3-particles-and-mmcs-of-al-7-si-045-mg-alloy-using-vortex-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11123.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">204</span> Effect of Nano-Alumina on the Mechanical Properties of Cold Recycled Asphalt</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shahab%20Hasani%20Nasab">Shahab Hasani Nasab</a>, <a href="https://publications.waset.org/abstracts/search?q=Aran%20Aeini"> Aran Aeini</a>, <a href="https://publications.waset.org/abstracts/search?q=Navid%20Kermanshahi"> Navid Kermanshahi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to reduce road building costs and reduce environmental damage, recycled materials can be used instead of mineral materials in the production of asphalt mixtures. Today, in most parts of the world, cold recycled asphalt with bitumen emulsion, has acceptable results. However, Cold Recycled Asphalt have some deficiency such as stripping, thermal cracking, and rutting. This requires the addition of additives to reduce this deficiency of recycled pavement with emulsified asphalt. In this research, nano-alumina and emulsified asphalt were used to modify the properties of recycled asphalt mixtures according to the technical specifications and the operation of cold recycling. Marshall test methods, dynamic creep test, and resiliency modulus test has been used to obtain the nano-alumina’s effects on asphalt mixture properties. The results show that the addition of nano-alumina would reduce the Marshall stability in samples but increases the rutting resistance. The resiliency modulus increases significantly with this additive. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cold%20asphalt" title="cold asphalt">cold asphalt</a>, <a href="https://publications.waset.org/abstracts/search?q=cold%20recycling" title=" cold recycling"> cold recycling</a>, <a href="https://publications.waset.org/abstracts/search?q=nano-alumina" title=" nano-alumina"> nano-alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=dynamic%20creep" title=" dynamic creep"> dynamic creep</a>, <a href="https://publications.waset.org/abstracts/search?q=bitumen%20emulsion" title=" bitumen emulsion"> bitumen emulsion</a> </p> <a href="https://publications.waset.org/abstracts/98810/effect-of-nano-alumina-on-the-mechanical-properties-of-cold-recycled-asphalt" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/98810.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">164</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">203</span> Influence of Drying Method in Parts of Alumina Obtained for Rapid Prototyping and Uniaxial Dry Pressing </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=N.%20O.%20Muniz">N. O. Muniz</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20A.%20Vechietti"> F. A. Vechietti</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Treccani"> L. Treccani</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Rezwan"> K. Rezwan</a>, <a href="https://publications.waset.org/abstracts/search?q=Luis%20Alberto%20dos%20Santos"> Luis Alberto dos Santos</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Developing new technologies in the manufacture of biomaterials is a major challenge for researchers in the tissue engineering area. Many in vitro and in vivo studies have revealed the significance of the porous structure of the biomaterials on the promotion of bone ingrowth. The use of Rapid Prototyping in the manufacture of ceramics in the biomedical area has increased in recent years and few studies are conducted on obtaining alumina pieces. The aim of this work was the study of alumina pieces obtained by 3D printing and uniaxial dry pressing (DP) in order to evaluate porosity achieved by this two different techniques. Also, the influence of the powder drying process was determined. The row alumina powders were drying by freeze drying and oven. Apparent porosity, apparent density, retraction after thermal treatment were evaluated. The porosity values obtained by DP, regardless of method of drying powders, were much lower than those obtained by RP as expected. And for the prototyped samples, the method of powder drying significantly influenced porosities, reached 48% for drying oven versus 65% for freeze-drying. Therefore, the method of 3D printing, using different powder drying, allows a better control over the porosity. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=rapid%20prototyping" title="rapid prototyping">rapid prototyping</a>, <a href="https://publications.waset.org/abstracts/search?q=freeze-drying" title=" freeze-drying"> freeze-drying</a>, <a href="https://publications.waset.org/abstracts/search?q=porosity" title=" porosity"> porosity</a>, <a href="https://publications.waset.org/abstracts/search?q=alumina" title=" alumina"> alumina</a> </p> <a href="https://publications.waset.org/abstracts/17560/influence-of-drying-method-in-parts-of-alumina-obtained-for-rapid-prototyping-and-uniaxial-dry-pressing" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/17560.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">471</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">202</span> Alumina Generated by Electrocoagulation as Adsorbent for the Elimination of the Iron from Drilling Water</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Aimad%20Oulebsir">Aimad Oulebsir</a>, <a href="https://publications.waset.org/abstracts/search?q=Toufik%20Chaabane"> Toufik Chaabane</a>, <a href="https://publications.waset.org/abstracts/search?q=Venkataraman%20Sivasankar"> Venkataraman Sivasankar</a>, <a href="https://publications.waset.org/abstracts/search?q=Andr%C3%A9%20Darchen"> André Darchen</a>, <a href="https://publications.waset.org/abstracts/search?q=Titus%20A.%20M.%20Msagati"> Titus A. M. Msagati</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Currently, the presence of pharmaceutical substances in the environment is an emerging pollution leading to the disruption of ecosystems. Indeed, water loaded with pharmaceutical residues is an issue that has raised the attention of researchers. The aim of this study was to monitor the effectiveness of the alumina electro-generated by the adsorption process the iron of well water for the production of drugs. The Fe2+ was removed from wastewater by adsorption in a batch cell. Performance results of iron removal by alumina electro-generated revealed that the efficiency of the carrier in the method of electro-generated adsorption. The overall Fe2+ of the synthetically solutions and simulated effluent removal efficiencies reached 75% and 65%, respectively. The application of models and isothermal adsorption kinetics complement the results obtained experimentally. Desorption of iron was investigated using a solution of 0.1M NaOH. Regeneration of the tests shows that the adsorbent maintains its capacity after five adsorption/desorption cycles. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electrocoagulation" title="electrocoagulation">electrocoagulation</a>, <a href="https://publications.waset.org/abstracts/search?q=aluminum%20electrode" title=" aluminum electrode"> aluminum electrode</a>, <a href="https://publications.waset.org/abstracts/search?q=electrogenerated%20alumina" title=" electrogenerated alumina"> electrogenerated alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=iron" title=" iron"> iron</a>, <a href="https://publications.waset.org/abstracts/search?q=adsorption%2Fdesorption" title=" adsorption/desorption"> adsorption/desorption</a> </p> <a href="https://publications.waset.org/abstracts/42493/alumina-generated-by-electrocoagulation-as-adsorbent-for-the-elimination-of-the-iron-from-drilling-water" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/42493.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">299</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">201</span> Production of Renewable and Clean Bio-Fuel (DME) from Biomethanol over Copper Modified Alumina Catalyst</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20I.%20Osman">Ahmed I. Osman</a>, <a href="https://publications.waset.org/abstracts/search?q=Jehad%20K.%20Abu-Dahrieh"> Jehad K. Abu-Dahrieh</a>, <a href="https://publications.waset.org/abstracts/search?q=David%20W.%20Rooney"> David W. Rooney</a>, <a href="https://publications.waset.org/abstracts/search?q=Jillian%20Thompson"> Jillian Thompson</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The effect of loading of copper on the catalytic performance of different alumina support during the dehydration of methanol to dimethyl ether (DME) was performed in a fixed bed reactor. There are two levels of loading; low loading (1, 2, 4 and 6% Cu wt/wt) and high loading (10 and 15% Cu wt/wt) on both AC350 (alumina catalyst calcined at 350) and AC550 (alumina catalyst calcined at 550), to study the effect of loading and the effect of the support during methanol dehydration to DME (MTD). The catalysts were characterized by TGA, XRD, BET, TPD-NH3, TEM and DRIFT-Pyridine. Under reaction conditions where the temperature ranged from 180-300˚C with a WHSV= 12.1 h-1 it was found that all the catalysts calcined at 550˚C showed higher activity than those calcined at 350˚C. In this study, the optimum catalyst was 6% Cu/AC550. This catalyst showed a high degree of stability, had one half activity of the pure catalyst (AC550) and double the activity of the optimum catalyst calcined at 350˚C (6% Cu/AC350). So, we recommended 6% Cu/AC550 for the production of DME from methanol. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bio-fuel" title="bio-fuel">bio-fuel</a>, <a href="https://publications.waset.org/abstracts/search?q=nano%20composite%20catalyst" title=" nano composite catalyst"> nano composite catalyst</a>, <a href="https://publications.waset.org/abstracts/search?q=DME" title=" DME"> DME</a>, <a href="https://publications.waset.org/abstracts/search?q=Cu-Al2O3" title=" Cu-Al2O3"> Cu-Al2O3</a> </p> <a href="https://publications.waset.org/abstracts/3494/production-of-renewable-and-clean-bio-fuel-dme-from-biomethanol-over-copper-modified-alumina-catalyst" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/3494.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">297</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">200</span> Study of the Toughening by Crack Bridging in Mullite Alumina Zirconia Ceramics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.%20Gheldane">F. Gheldane</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bouras"> S. Bouras</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Crack propagation behaviour of alumina mullite zirconia ceramic is investigated under monotonic and cyclic loading by means SENB bending method. This material show R-curve effects, i.e. an increase in crack growth resistance with increasing crack depth. The morphological study showed that the resistance of the crack propagation is mainly connected to the crack bridging. The value of bridging stress is in good agreement with the literature. Furthermore, cyclic-loading fatigue is caused by a decrease in the stress-shielding effect, due to degradation of bridging sites under cyclic loading. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina%20mullite%20zirconia" title="alumina mullite zirconia">alumina mullite zirconia</a>, <a href="https://publications.waset.org/abstracts/search?q=R-curve" title=" R-curve"> R-curve</a>, <a href="https://publications.waset.org/abstracts/search?q=bridging" title=" bridging"> bridging</a>, <a href="https://publications.waset.org/abstracts/search?q=toughening" title=" toughening"> toughening</a>, <a href="https://publications.waset.org/abstracts/search?q=crack" title=" crack"> crack</a> </p> <a href="https://publications.waset.org/abstracts/15375/study-of-the-toughening-by-crack-bridging-in-mullite-alumina-zirconia-ceramics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15375.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">524</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">199</span> Thixomixing as Novel Method for Fabrication Aluminum Composite with Carbon and Alumina Fibers</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ebrahim%20Akbarzadeh">Ebrahim Akbarzadeh</a>, <a href="https://publications.waset.org/abstracts/search?q=Josep%20A.%20Picas%20Barrachina"> Josep A. Picas Barrachina</a>, <a href="https://publications.waset.org/abstracts/search?q=Maite%20Baile%20Puig"> Maite Baile Puig</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study focuses on a novel method for dispersion and distribution of reinforcement under high intensive shear stress to produce metal composites. The polyacrylonitrile (PAN)-based short carbon fiber (Csf) and Nextel 610 alumina fiber were dispersed under high intensive shearing at mushy zone in semi-solid of A356 by a novel method. The bundles and clusters were embedded by infiltration of slurry into the clusters, thus leading to a uniform microstructure. The fibers were embedded homogenously into the aluminum around 576-580°C with around 46% of solid fraction. Other experiments at 615°C and 568°C which are contained 0% and 90% solid respectively were not successful for dispersion and infiltration of aluminum into bundles of Csf. The alumina fiber has been cracked by high shearing load. The morphologies and crystalline phase were evaluated by SEM and XRD. The adopted thixo-process effectively improved the adherence and distribution of Csf into Al that can be developed to produce various composites by thixomixing. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aluminum" title="aluminum">aluminum</a>, <a href="https://publications.waset.org/abstracts/search?q=carbon%20fiber" title=" carbon fiber"> carbon fiber</a>, <a href="https://publications.waset.org/abstracts/search?q=alumina%20fiber" title=" alumina fiber"> alumina fiber</a>, <a href="https://publications.waset.org/abstracts/search?q=thixomixing" title=" thixomixing"> thixomixing</a>, <a href="https://publications.waset.org/abstracts/search?q=adhesion" title=" adhesion"> adhesion</a> </p> <a href="https://publications.waset.org/abstracts/22998/thixomixing-as-novel-method-for-fabrication-aluminum-composite-with-carbon-and-alumina-fibers" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22998.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">558</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">198</span> Scale Up-Mechanochemical Synthesis of High Surface Area Alpha-Alumina</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sarah%20Triller">Sarah Triller</a>, <a href="https://publications.waset.org/abstracts/search?q=Ferdi%20Sch%C3%BCth"> Ferdi Schüth</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The challenges encountered in upscaling the mechanochemical synthesis of high surface area α-alumina are investigated in this study. After lab-scale experiments in shaker mills and planetary ball mills, the optimization of reaction parameters of the conversion in the smallest vessel of a scalable mill, named Simoloyer, was developed. Furthermore, the future perspectives by scaling up the conversion in several steps are described. Since abrasion from the steel equipment can be problematic, the process was transferred to a ceramically lined mill, which solved the contamination problem. The recovered alpha-alumina shows a high specific surface area in all investigated scales. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=mechanochemistry" title="mechanochemistry">mechanochemistry</a>, <a href="https://publications.waset.org/abstracts/search?q=scale-up" title=" scale-up"> scale-up</a>, <a href="https://publications.waset.org/abstracts/search?q=ball%20milling" title=" ball milling"> ball milling</a>, <a href="https://publications.waset.org/abstracts/search?q=ceramic%20lining" title=" ceramic lining"> ceramic lining</a> </p> <a href="https://publications.waset.org/abstracts/175554/scale-up-mechanochemical-synthesis-of-high-surface-area-alpha-alumina" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/175554.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">66</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">197</span> Surface Induced Alteration of Nanosized Amorphous Alumina</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Katsman">A. Katsman</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Bloch"> L. Bloch</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Etinger"> Y. Etinger</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Kauffmann"> Y. Kauffmann</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Pokroy"> B. Pokroy </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Various nanosized amorphous alumina thin films in the range of (2.4 - 63.1) nm were deposited onto amorphous carbon and amorphous Si3N4 membrane grids. Transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS), X-ray photoelectron spectroscopy (XPS) and differential scanning calorimetry (DSC) techniques were used to probe the size effect on the short range order and the amorphous to crystalline phase transition temperature. It was found that the short-range order changes as a function of size: the fraction of tetrahedral Al sites is greater in thinner amorphous films. This result correlates with the change of amorphous alumina density with the film thickness demonstrated by the reflectivity experiments: the thinner amorphous films have the less density. These effects are discussed in terms of surface reconstruction of the amorphous alumina films. The average atomic binding energy in the thin film layer decreases with decease of the thickness, while the average O-Al interatomic distance increases. The reconstruction of amorphous alumina is induced by the surface reconstruction, and the short range order changes being dependent on the density. Decrease of the surface energy during reconstruction is the driving force of the alumina reconstruction (density change) followed by relaxation process (short range order change). The amorphous to crystalline phase transition temperature measured by DSC rises with the decrease in thickness from 997.6°C for 13.9 nm to 1020.4 °C for 2.7 nm thick. This effect was attributed to the different film densities: formation of nanovoids preceding and accompanying crystallization process influences the crystallization rate, and by these means, the temperature of crystallization peak. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=amorphous%20alumina" title="amorphous alumina">amorphous alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=density" title=" density"> density</a>, <a href="https://publications.waset.org/abstracts/search?q=short%20range%20order" title=" short range order"> short range order</a>, <a href="https://publications.waset.org/abstracts/search?q=size%20effect" title=" size effect"> size effect</a> </p> <a href="https://publications.waset.org/abstracts/23605/surface-induced-alteration-of-nanosized-amorphous-alumina" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23605.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">466</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">196</span> Investigation the Effect of Nano-Alumina Particles on Physical Adsorption Property of Acrylic Fiber</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mehdi%20Ketabchi">Mehdi Ketabchi</a>, <a href="https://publications.waset.org/abstracts/search?q=Shamsollah%20Alijanlou"> Shamsollah Alijanlou</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The flue gas from fossil fuels combustion contains harmful pollutants dangerous for human health and the environment. One of the air pollution control methods to restrict the emission of these pollutants is based on using the nanoparticle in the adsorption process. In the present research gamma, Nano-alumina particle is added to Polyacrylonitrile (PAN) polymer through simple loading method and the adsorption capacity of the wet spun fiber is investigated. The results of exposure the fiber to the acid gasses including SO2, CO, NO2, NO and CO2 show the noticeable increase of gas adsorption capacity on fiber contains nanoparticle. The research has been conducted in Acrylic II Plant of Polyacryl Iran Corporation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acrylic%20fiber" title="acrylic fiber">acrylic fiber</a>, <a href="https://publications.waset.org/abstracts/search?q=adsorbent" title=" adsorbent"> adsorbent</a>, <a href="https://publications.waset.org/abstracts/search?q=wet%20spun" title=" wet spun"> wet spun</a>, <a href="https://publications.waset.org/abstracts/search?q=nano%20gamma%20alumina" title=" nano gamma alumina"> nano gamma alumina</a> </p> <a href="https://publications.waset.org/abstracts/35916/investigation-the-effect-of-nano-alumina-particles-on-physical-adsorption-property-of-acrylic-fiber" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/35916.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">314</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">195</span> Comparative Analysis of Water-Based Alumina Nanoparticles with Water-Based Cupric Nanoparticles Past an Exponentially Accelerated Vertical Radiative Riga Plate with Heat Transfer </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kanayo%20Kenneth%20Asogwa">Kanayo Kenneth Asogwa</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The influence of the flow of nanoparticles in nanofluids across a vertical surface is significant, and its application in medical sciences, engineering, pharmaceutical, and food industries is enormous & widely published. However, the comparative examination of alumina nanoparticles with cupric nanoparticles past a rapid progressive Riga plate remains unknown. Thus, this report investigates water-based alumina and cupric nanoparticles passing through an exponentially accelerated Riga plate. Nanofluids containing copper (II) oxide (CuO) and aluminum oxide (Al2O3) nanoparticles are considered. The Laplace transform technique is used to solve the partial differential equations guiding the flow. The effect of various factors on skin friction coefficient, Nusselt number, velocity and temperature profiles is investigated and reported in tabular and graphical form. The upsurge of Modified Hartmann number and radiative impact improves copper (II) oxide nanofluid compared to aluminum oxide nanofluid due to Lorentz force and since CuO is a better heat conductor. At the same time, heat absorption and reactive species favor a slight decline in Alumina nanofluid than Cupric nanofluid in the thermal and velocity fields. The higher density of Cupric nanofluid is enhanced by increasing nanoparticle volume fraction over Alumina nanofluid with a decline in velocity distribution. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina" title="alumina">alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=cupric" title=" cupric"> cupric</a>, <a href="https://publications.waset.org/abstracts/search?q=nanoparticles" title=" nanoparticles"> nanoparticles</a>, <a href="https://publications.waset.org/abstracts/search?q=water-based" title=" water-based"> water-based</a> </p> <a href="https://publications.waset.org/abstracts/138387/comparative-analysis-of-water-based-alumina-nanoparticles-with-water-based-cupric-nanoparticles-past-an-exponentially-accelerated-vertical-radiative-riga-plate-with-heat-transfer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/138387.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">202</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">194</span> Investigation of the Effect of Nano-Alumina Particles on Adsorption Property of Acrylic Fiber</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mehdi%20Ketabchi">Mehdi Ketabchi</a>, <a href="https://publications.waset.org/abstracts/search?q=Shallah%20Alijanlo"> Shallah Alijanlo</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The flue gas from fossil fuels combustion contains harmful pollutants dangerous for human health and environment. One of the air pollution control methods to restrict the emission of these pollutants is based on using the nanoparticle in adsorption process. In the present research, gamma nano-alumina particle is added to polyacrylonitrile (PAN) polymer through simple loading method, and the adsorption capacity of the wet spun fiber is investigated. The results of exposure the fiber to the acid gases including SO<sub>2</sub>, CO, NO<sub>2</sub>, NO, and CO<sub>2</sub> show the noticeable increase of gas adsorption capacity on fiber contains nanoparticle. The research has been conducted in Acrylic II Plant of Polyacryl Iran Corporation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acrylic%20fiber" title="acrylic fiber">acrylic fiber</a>, <a href="https://publications.waset.org/abstracts/search?q=adsorbent" title=" adsorbent"> adsorbent</a>, <a href="https://publications.waset.org/abstracts/search?q=wet%20spun" title=" wet spun"> wet spun</a>, <a href="https://publications.waset.org/abstracts/search?q=polyacryl%20company" title=" polyacryl company"> polyacryl company</a>, <a href="https://publications.waset.org/abstracts/search?q=nano%20gamma%20alumina" title=" nano gamma alumina"> nano gamma alumina</a> </p> <a href="https://publications.waset.org/abstracts/99415/investigation-of-the-effect-of-nano-alumina-particles-on-adsorption-property-of-acrylic-fiber" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/99415.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">177</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">193</span> Separation of CO2 Using MFI-Alumina Nanocomposite Hollow Fiber Ion-Exchanged with Alkali Metal Cation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Alshebani">A. Alshebani</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Swesi"> Y. Swesi</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Mrayed"> S. Mrayed</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20Altaher"> F. Altaher</a>, <a href="https://publications.waset.org/abstracts/search?q=I.%20Musbah"> I. Musbah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Cs-type nanocomposite zeolite membrane was successfully synthesized on an alumina ceramic hollow fibre with a mean outer diameter of 1.7 mm; cesium cationic exchange test was carried out inside test module with mean wall thickness of 230 μm and an average crossing pore size smaller than 0.2 μm. Separation factor of n-butane/H2 obtained indicate that a relatively high quality closed to 20. Maxwell-Stefan modeling provides an equivalent thickness lower than 1 µm. To compare the difference an application to CO2/N2 separation has been achieved, reaching separation factors close to (4,18) before and after cation exchange on H-zeolite membrane formed within the pores of a ceramic alumina substrate. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MFI%20membrane" title="MFI membrane">MFI membrane</a>, <a href="https://publications.waset.org/abstracts/search?q=nanocomposite" title=" nanocomposite"> nanocomposite</a>, <a href="https://publications.waset.org/abstracts/search?q=ceramic%20hollow%20fibre" title=" ceramic hollow fibre"> ceramic hollow fibre</a>, <a href="https://publications.waset.org/abstracts/search?q=CO2" title=" CO2"> CO2</a>, <a href="https://publications.waset.org/abstracts/search?q=ion-exchange" title=" ion-exchange"> ion-exchange</a> </p> <a href="https://publications.waset.org/abstracts/12639/separation-of-co2-using-mfi-alumina-nanocomposite-hollow-fiber-ion-exchanged-with-alkali-metal-cation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/12639.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">300</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">192</span> Separation of CO2 Using MFI-Alumina Nanocomposite Hollow Fibre Ion-Exchanged with Alkali Metal Cation </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Alshebani">A. Alshebani</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Swesi"> Y. Swesi</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Mrayed"> S. Mrayed</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20Altaher"> F. Altaher</a>, <a href="https://publications.waset.org/abstracts/search?q=I.%20Musbah"> I. Musbah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Cs-type nanocomposite zeolite membrane was successfully synthesized on a alumina ceramic hollow fibre with a mean outer diameter of 1.7 mm, cesium cationic exchange test was carried out inside test module with mean wall thickness of 230 μm and an average crossing pore size smaller than 0.2 μm. Separation factor of n-butane/H2 obtained indicate that a relatively high quality closed to 20. Maxwell-Stefan modeling provides an equivalent thickness lower than 1 µm. To compare the difference an application to CO2/N2 separation has been achieved, reaching separation factors close to (4,18) before and after cation exchange on H-zeolite membrane formed within the pores of a ceramic alumina substrate. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MFI%20membrane" title="MFI membrane">MFI membrane</a>, <a href="https://publications.waset.org/abstracts/search?q=CO2" title=" CO2"> CO2</a>, <a href="https://publications.waset.org/abstracts/search?q=nanocomposite" title=" nanocomposite"> nanocomposite</a>, <a href="https://publications.waset.org/abstracts/search?q=ceramic%20hollow%20fibre" title=" ceramic hollow fibre"> ceramic hollow fibre</a>, <a href="https://publications.waset.org/abstracts/search?q=ion-exchange" title=" ion-exchange"> ion-exchange</a> </p> <a href="https://publications.waset.org/abstracts/20708/separation-of-co2-using-mfi-alumina-nanocomposite-hollow-fibre-ion-exchanged-with-alkali-metal-cation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/20708.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">484</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">191</span> Fabrication of Al/Al2O3 Functionally Graded Composites via Centrifugal Method by Using a Polymeric Suspension</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Majid%20Eslami">Majid Eslami</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Functionally graded materials (FGMs) exhibit heterogeneous microstructures in which the composition and properties gently change in specified directions. The common type of FGMs consist of a metal in which ceramic particles are distributed with a graded concentration. There are many processing routes for FGMs. An important group of these methods is casting techniques (gravity or centrifugal). However, the main problem of casting molten metal slurry with dispersed ceramic particles is a destructive chemical reaction between these two phases which deteriorates the properties of the materials. In order to overcome this problem, in the present investigation a suspension of 6061 aluminum and alumina powders in a liquid polymer was used as the starting material and subjected to centrifugal force for making FGMs. The size rang of these powders was 45-63 and 106-125 μm. The volume percent of alumina in the Al/Al2O3 powder mixture was in the range of 5 to 20%. PMMA (Plexiglas) in different concentrations (20-50 g/lit) was dissolved in toluene and used as the suspension liquid. The glass mold contaning the suspension of Al/Al2O3 powders in the mentioned liquid was rotated at 1700 rpm for different times (4-40 min) while the arm length was kept constant (10 cm) for all the experiments. After curing the polymer, burning out the binder, cold pressing and sintering , cylindrical samples (φ=22 mm h=20 mm) were produced. The density of samples before and after sintering was quantified by Archimedes method. The results indicated that by using the same sized alumina and aluminum powders particles, FGM sample can be produced by rotation times exceeding 7 min. However, by using coarse alumina and fine alumina powders the sample exhibits step concentration. On the other hand, using fine alumina and coarse alumina results in a relatively uniform concentration of Al2O3 along the sample height. These results are attributed to the effects of size and density of different powders on the centrifugal force induced on the powders during rotation. The PMMA concentration and the vol.% of alumina in the suspension did not have any considerable effect on the distribution of alumina particles in the samples. The hardness profiles along the height of samples were affected by both the alumina vol.% and porosity content. The presence of alumina particles increased the hardness while increased porosity reduced the hardness. Therefore, the hardness values did not show the expected gradient in same sample. The sintering resulted in decreased porosity for all the samples investigated. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=FGM" title="FGM">FGM</a>, <a href="https://publications.waset.org/abstracts/search?q=powder%20metallurgy" title=" powder metallurgy"> powder metallurgy</a>, <a href="https://publications.waset.org/abstracts/search?q=centrifugal%20method" title=" centrifugal method"> centrifugal method</a>, <a href="https://publications.waset.org/abstracts/search?q=polymeric%20suspension" title=" polymeric suspension"> polymeric suspension</a> </p> <a href="https://publications.waset.org/abstracts/6826/fabrication-of-alal2o3-functionally-graded-composites-via-centrifugal-method-by-using-a-polymeric-suspension" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6826.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">211</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">190</span> Organic Rejection and Membrane Fouling with Inorganic Alumina Membrane for Industrial Wastewater Treatment</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rizwan%20Ahmad">Rizwan Ahmad</a>, <a href="https://publications.waset.org/abstracts/search?q=Soomin%20Chang"> Soomin Chang</a>, <a href="https://publications.waset.org/abstracts/search?q=Daeun%20Kwon"> Daeun Kwon</a>, <a href="https://publications.waset.org/abstracts/search?q=Jeonghwan%20Kim"> Jeonghwan Kim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Interests in an inorganic membrane are growing rapidly for industrial wastewater treatment due to its excellent chemical and thermal stability over polymeric membrane. Nevertheless, understanding of the membrane rejection and fouling rate caused by the deposit of contaminants on membrane surface and within membrane pores through inorganic porous membranes still requires much attention. Microfiltration alumina membranes were developed and applied for the industrial wastewater treatment to investigate rejection efficiency of organic contaminant and membrane fouling at various operational conditions. In this study, organic rejection and membrane fouling were investigated by using the alumina flat-tubular membrane developed for the treatment of industrial wastewaters. The flat-tubular alumina membranes were immersed in a fluidized membrane reactor added with granular activated carbon (GAC) particles. Fluidization was driven by recirculating a bulk industrial wastewater along membrane surface through the reactor. In the absence of GAC particles, for hazardous anionic dye contaminants, functional group characterized by the organic contaminant was found as one of the main factors affecting both membrane rejection and fouling rate. More fouling on the membrane surface led to the existence of dipolar characterizations and this was more pronounced at lower solution pH, thereby improving membrane rejection accordingly. Similar result was observed with a real metal-plating wastewater. Strong correlation was found that higher fouling rate resulted in higher organic rejection efficiency. Hydrophilicity exhibited by alumina membrane improved the organic rejection efficiency of the membrane due to the formation of hydrophilic fouling layer deposited on it. In addition, less surface roughness of alumina membrane resulted in less fouling rate. Regardless of the operational conditions applied in this study, fluidizing the GAC particles along the surface of alumina membrane was very effective to enhance organic removal efficiency higher than 95% and provide an excellent tool to reduce membrane fouling. Less than 0.1 bar as suction pressure was maintained with the alumina membrane at 25 L/m²hr of permeate set-point flux during the whole operational periods without performing any backwashing and chemical enhanced cleaning for the membrane. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina%20membrane" title="alumina membrane">alumina membrane</a>, <a href="https://publications.waset.org/abstracts/search?q=fluidized%20membrane%20reactor" title=" fluidized membrane reactor"> fluidized membrane reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=industrial%20wastewater" title=" industrial wastewater"> industrial wastewater</a>, <a href="https://publications.waset.org/abstracts/search?q=membrane%20fouling" title=" membrane fouling"> membrane fouling</a>, <a href="https://publications.waset.org/abstracts/search?q=rejection" title=" rejection"> rejection</a> </p> <a href="https://publications.waset.org/abstracts/102592/organic-rejection-and-membrane-fouling-with-inorganic-alumina-membrane-for-industrial-wastewater-treatment" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/102592.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">167</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">189</span> Development of a Nano-Alumina-Zirconia Composite Catalyst as an Active Thin Film in Biodiesel Production</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=N.%20Marzban">N. Marzban</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20K.%20Heydarzadeh%20M.%20Pourmohammadbagher"> J. K. Heydarzadeh M. Pourmohammadbagher</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20H.%20Hatami"> M. H. Hatami</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Samia"> A. Samia</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A nano-alumina-zirconia composite catalyst was synthesized by a simple aqueous sol-gel method using AlCl<sub>3</sub>.6H<sub>2</sub>O and ZrCl<sub>4</sub> as precursors. Thermal decomposition of the precursor and subsequent formation of γ-Al<sub>2</sub>O<sub>3</sub> and t-Zr were investigated by thermal analysis. XRD analysis showed that γ-Al<sub>2</sub>O<sub>3</sub> and t-ZrO<sub>2 </sub>phases were formed at 700 °C. FT-IR analysis also indicated that the phase transition to γ-Al<sub>2</sub>O<sub>3</sub> occurred in corroboration with X-ray studies. TEM analysis of the calcined powder revealed that spherical particles were in the range of 8-12 nm. The nano-alumina-zirconia composite particles were mesoporous and uniformly distributed in their crystalline phase. In order to measure the catalytic activity, esteriﬁcation reaction was carried out. Biodiesel, as a renewable fuel, was formed in a continuous packed column reactor. Free fatty acid (FFA) was esterified with ethanol in a heterogeneous catalytic reactor. It was found that the synthesized γ-Al<sub>2</sub>O<sub>3</sub>/ZrO<sub>2</sub> composite had the potential to be used as a heterogeneous base catalyst for biodiesel production processes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nano%20alumina-zirconia" title="nano alumina-zirconia">nano alumina-zirconia</a>, <a href="https://publications.waset.org/abstracts/search?q=composite%20catalyst" title=" composite catalyst"> composite catalyst</a>, <a href="https://publications.waset.org/abstracts/search?q=thin%20film" title=" thin film"> thin film</a>, <a href="https://publications.waset.org/abstracts/search?q=biodiesel" title=" biodiesel"> biodiesel</a> </p> <a href="https://publications.waset.org/abstracts/58859/development-of-a-nano-alumina-zirconia-composite-catalyst-as-an-active-thin-film-in-biodiesel-production" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/58859.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">233</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">188</span> Effect of Nano/Micro Alumina Matrix on Alumina-Cubic Boron Nitride Composites Consolidated by Spark Plasma Sintering </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20S.%20Hakeem">A. S. Hakeem</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Ahmed"> B. Ahmed</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Ehsan"> M. Ehsan</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Ibrahim"> A. Ibrahim</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20M.%20Irshad"> H. M. Irshad</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Laoui"> T. Laoui</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Alumina (Al2O3) - cubic boron nitride (cBN) ceramic composites were sintered by spark plasma sintering (SPS) using α-Al2O3 particle sizes; 150 µm, 150 nm and cBN particle size of 42 µm. Alumina-cBN composites containing 10, 20 and 30wt% cBN with and without Ni coated were sintering at an elevated temperature of 1400°C at a constant uniaxial pressure of 50 MPa. The effect of matrix particle size, cBN and Ni content on mechanical properties and thermal properties, i.e., thermal conductivity, diffusivity, expansion, densification, phase transformation, microstructure, hardness and toughness of the Al2O3-cBN/(Ni) composites under specific sintering conditions were investigated. The highest relative densification of 150 nm-Al2O3 containing 30wt% cBN (Ni coated) composite was 99% at TSPS = 1400°C. In case of 150 µm- Al2O3 compositions, the phase transformation of cBN to hBN were observed, and the relative densification decreased. Thermal conductivity depicts maximum value in case of 150 nm- Al2O3-30wt% cBN-Ni composition. The Vickers hardness of this composition at TSPS = 1400°C also showed the highest value of 29 GPa. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina%20composite" title="alumina composite">alumina composite</a>, <a href="https://publications.waset.org/abstracts/search?q=cubic%20boron%20nitride" title=" cubic boron nitride"> cubic boron nitride</a>, <a href="https://publications.waset.org/abstracts/search?q=mechanical%20properties" title=" mechanical properties"> mechanical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=phase%20transformation" title=" phase transformation"> phase transformation</a>, <a href="https://publications.waset.org/abstracts/search?q=Spark%20plasma%20sintering" title=" Spark plasma sintering "> Spark plasma sintering </a> </p> <a href="https://publications.waset.org/abstracts/67800/effect-of-nanomicro-alumina-matrix-on-alumina-cubic-boron-nitride-composites-consolidated-by-spark-plasma-sintering" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/67800.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">342</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">187</span> The Effect of Silanization on Alumina for Improving the Compatibility with Poly(Methacrylic Acid) Matrix for Dental Restorative Materials</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Andrei%20Tiberiu%20Cucuruz">Andrei Tiberiu Cucuruz</a>, <a href="https://publications.waset.org/abstracts/search?q=Ecaterina%20Andronescu"> Ecaterina Andronescu</a>, <a href="https://publications.waset.org/abstracts/search?q=Cristina%20Daniela%20Ghitulica"> Cristina Daniela Ghitulica</a>, <a href="https://publications.waset.org/abstracts/search?q=Andreia%20Cucuruz"> Andreia Cucuruz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In modern dentistry, the application of resin-based composites continues to increase and in the majority of countries has completely replaced mercury amalgams. Alumina (Al2O3) is a representative bioinert ceramic with a variety of applications in industry as well as in medicine. Alumina has the potential to improve electrical resistivity and thermal conductivity of polymers. The application of poly(methacrylic acid) (PMAA) in medicine was poorly investigated in the past but can lead to good results by the incorporation of alumina particles that can bring bioinertness to the composite. However, because of the differences related to chemical bonding of these materials, the interaction is very weak at the interface leading to no significant values in practical situations. The aim of this work was to modify the structure of alumina with silane coupling agents and to study the influence of silanization on the physicomechanical properties of the resulting composite materials. Two silanes were used in this study: 3-aminopropyl-trimethoxysilane (APTMS) and dichlorodimethylsilane (DCDMS). Both silanes proved to have a significant effect on the overall performance of composites by establishing bonds with the polymer matrix and the filler. All these improvements in dental adhesive systems made for bonding resin composites to tooth structure have enhanced the clinical application of polymeric restorative materials to the position that they are now considered the material of choice for esthetic restoration. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alumina" title="alumina">alumina</a>, <a href="https://publications.waset.org/abstracts/search?q=compressive%20strength" title=" compressive strength"> compressive strength</a>, <a href="https://publications.waset.org/abstracts/search?q=dental%20materials" title=" dental materials"> dental materials</a>, <a href="https://publications.waset.org/abstracts/search?q=silane%20coupling%20agents" title=" silane coupling agents"> silane coupling agents</a>, <a href="https://publications.waset.org/abstracts/search?q=poly%28methacrylic%20acid%29" title=" poly(methacrylic acid) "> poly(methacrylic acid) </a> </p> <a href="https://publications.waset.org/abstracts/62767/the-effect-of-silanization-on-alumina-for-improving-the-compatibility-with-polymethacrylic-acid-matrix-for-dental-restorative-materials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/62767.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">350</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">186</span> Decarboxylation of Waste Coconut Oil and Comparison of Acid Values</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Pabasara%20H.%20Gamage">Pabasara H. Gamage</a>, <a href="https://publications.waset.org/abstracts/search?q=Sisira%20K.%20Weliwegamage"> Sisira K. Weliwegamage</a>, <a href="https://publications.waset.org/abstracts/search?q=Sameera%20R.%20Gunatilake"> Sameera R. Gunatilake</a>, <a href="https://publications.waset.org/abstracts/search?q=Hondamuni%20I.%20C%20De%20Silva"> Hondamuni I. C De Silva</a>, <a href="https://publications.waset.org/abstracts/search?q=Parakrama%20Karunaratne"> Parakrama Karunaratne</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Green diesel is an upcoming category of biofuels, which has more practical advantages than biodiesel. Production of green diesel involves production of hydrocarbons from various fatty acid sources. Though green diesel is chemically similar to fossil fuel hydrocarbons, it is more environmentally friendly. Decarboxylation of fatty acid sources is one of green diesel production methods and is less expensive and more energy efficient compared to hydrodeoxygenation. Free fatty acids (FFA), undergo decarboxylation readily than triglycerides. Waste coconut oil, which is a rich source of FFA, can be easily decarboxylated than other oils which have lower FFA contents. These free fatty acids can be converted to hydrocarbons by decarboxylation. Experiments were conducted to carry out decarboxylation of waste coconut oil in a high pressure hastealloy reactor (Toption Goup LTD), in the presence of soda lime and mixtures of soda lime and alumina. Acid value (AV) correlates to the amount of FFA available in a sample of oil. It can be shown that with the decreasing of AV, FFAs have converted to hydrocarbons. First, waste coconut oil was reacted with soda lime alone, at 150 °C, 200 °C, and 250 °C and 1.2 MPa pressure for 2 hours. AVs of products at different temperatures were compared. AV of products decreased with increasing temperature. Thereafter, different mixtures of soda lime and alumina (100% Soda lime, 1:1 soda lime and alumina and 100% alumina) were employed at temperatures 150 °C, 200 °C, and 250 °C and 1.2 MPa pressure. The lowest AV of 2.99±0.03 was obtained when 1:1 soda lime and alumina were employed at 250 °C. It can be concluded with respect to the AV that the amount of FFA decreased when decarboxylation temperature was increased. Soda lime:alumina 1:1 mixture showed the lowest AV among the compositions studied. These findings lead to formulate a method to successfully synthesize hydrocarbons by decarboxylating waste coconut oil in the presence of soda lime and alumina (1:1) at elevated tempertaures such as 250 °C. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acid%20value" title="acid value">acid value</a>, <a href="https://publications.waset.org/abstracts/search?q=free%20fatty%20acids" title=" free fatty acids"> free fatty acids</a>, <a href="https://publications.waset.org/abstracts/search?q=green%20diesel" title=" green diesel"> green diesel</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20pressure%20reactor" title=" high pressure reactor"> high pressure reactor</a>, <a href="https://publications.waset.org/abstracts/search?q=waste%20coconut%20oil" title=" waste coconut oil"> waste coconut oil</a> </p> <a href="https://publications.waset.org/abstracts/41339/decarboxylation-of-waste-coconut-oil-and-comparison-of-acid-values" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/41339.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">300</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=alumina&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=alumina&page=3">3</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=alumina&page=4">4</a></li> <li class="page-item"><a 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