The Experts below are selected from a list of 413727 Experts worldwide ranked by ideXlab platform
Md Nazrul Islam - One of the best experts on this subject based on the ideXlab platform.
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Chemical Treatment of coir fiber reinforced polypropylene composites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Md Mominul Haque, Mahbub Hasan, Md Nazrul IslamAbstract:Agro-based renewable materials have received significant attention in recent years because of their low cost, light weight, ecofriendliness, and worldwide environmental awareness. In the present work, coir fiber reinforced polypropylene composites were manufactured using injection molding method. Raw coir was Chemically treated with benzene diazonium salt in alkali, acidic, and neutral media separately in order to increase the compatibility between the coir fiber and polypropylene composite. During Chemical Treatment, hydrophilic -OH groups in the raw coir cellulose were converted to hydrophobic -O–Na groups. Both raw and treated coir at 10, 15, 20, 25, 30, and 35 wt % were utilized during composite manufacturing. Microstructural analysis and mechanical tests were conducted. Alkali treated specimens yielded the best set of mechanical properties. On the basis of fiber loading, 30% fiber reinforced composites had the optimum set of mechanical properties among all composites manufactured.
Miro Zema - One of the best experts on this subject based on the ideXlab platform.
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wet Chemical Treatment for improved surface passivation of textured silicon heterojunction solar cells
Energy Procedia, 2014Co-Authors: Dimitrios Deligiannis, Spyrido Alivizatos, Andrea Ingenito, Dong Zhang, Martij Van Sebille, Rene A C M M Van Swaaij, Miro ZemaAbstract:Silicon heterojunction (SHJ) solar cells constantly gain more attention due to their low cost and relatively high efficiency. An important aspect of these solar cells is the incorporation of intrinsic hydrogenated amorphous silicon (a-Si:H) layers at each side of the c-Si wafer, which has increased the efficiency potential due to the excellent surface passivation. By applying a randomly textured instead of a double-side polished wafer, optical enhancement is achieved resulting in significant reflection reduction and high short-circuit current densities (Jsc). However, texturing-induced defects lead to an a-Si:H/c-Si interface with increased recombination, which limits the open circuit voltage (Voc) of the SHJ device after using the same cleaning Treatment as for the flat wafer. Thus, a one-to-one transfer of process parameters from flat to textured c-Si substrate is not necessarily appropriate and a different wet-Chemical Treatment is needed. In this work, a Chemical Treatment is demonstrated, which leads to an improved surface passivation.
Md Mominul Haque - One of the best experts on this subject based on the ideXlab platform.
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Chemical Treatment of coir fiber reinforced polypropylene composites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Md Mominul Haque, Mahbub Hasan, Md Nazrul IslamAbstract:Agro-based renewable materials have received significant attention in recent years because of their low cost, light weight, ecofriendliness, and worldwide environmental awareness. In the present work, coir fiber reinforced polypropylene composites were manufactured using injection molding method. Raw coir was Chemically treated with benzene diazonium salt in alkali, acidic, and neutral media separately in order to increase the compatibility between the coir fiber and polypropylene composite. During Chemical Treatment, hydrophilic -OH groups in the raw coir cellulose were converted to hydrophobic -O–Na groups. Both raw and treated coir at 10, 15, 20, 25, 30, and 35 wt % were utilized during composite manufacturing. Microstructural analysis and mechanical tests were conducted. Alkali treated specimens yielded the best set of mechanical properties. On the basis of fiber loading, 30% fiber reinforced composites had the optimum set of mechanical properties among all composites manufactured.
Mahbub Hasan - One of the best experts on this subject based on the ideXlab platform.
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effect of Chemical Treatment on the properties of coir fiber reinforced polypropylene and polyethylene composites
Polymer Composites, 2017Co-Authors: Mahbub Hasan, Syed M N Hasan, Md Jahangir Hossain, Nazia NafsinAbstract:Chemical Treatment of reinforcement material is one of the main ways of improving the mechanical properties of natural fiber reinforced polymer composites. In the present study, coir fiber was used as reinforcement material, while polypropylene (PP) and polyethylene (PE) polymer were used as matrix material. Before reinforcing with polymer, raw coir fiber was Chemically treated with basic chromium sulfate and sodium bicarbonate in a sieve shaker. Hot-pressed method was used for composite manufacturing during which the fiber loading was varied at 0, 5, 10, 15, and 20 wt%. Comparison of the properties of raw and Chemically treated coir fiber reinforced PP and PE was conducted. Mechanical characteristics of the composites were evaluated using tensile, flexural, impact, and hardness tests. Water absorption test was conducted to know water uptake characteristics. Microstructural analysis using a scanning electron microscope was performed to observe the adhesiveness between the matrix and the fiber. Thermogravimetric analysis was done to observe the physical and Chemical changes in fiber and composites. The results showed that Chemical Treatment improved the physical, mechanical, and thermal properties of the manufactured composites. PP composites had better properties as compared to PE composites, while higher fiber loading resulted in better mechanical properties of the resultant composites. POLYM. COMPOS., 2015. © 2015 Society of Plastics Engineers
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Chemical Treatment of coir fiber reinforced polypropylene composites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Md Mominul Haque, Mahbub Hasan, Md Nazrul IslamAbstract:Agro-based renewable materials have received significant attention in recent years because of their low cost, light weight, ecofriendliness, and worldwide environmental awareness. In the present work, coir fiber reinforced polypropylene composites were manufactured using injection molding method. Raw coir was Chemically treated with benzene diazonium salt in alkali, acidic, and neutral media separately in order to increase the compatibility between the coir fiber and polypropylene composite. During Chemical Treatment, hydrophilic -OH groups in the raw coir cellulose were converted to hydrophobic -O–Na groups. Both raw and treated coir at 10, 15, 20, 25, 30, and 35 wt % were utilized during composite manufacturing. Microstructural analysis and mechanical tests were conducted. Alkali treated specimens yielded the best set of mechanical properties. On the basis of fiber loading, 30% fiber reinforced composites had the optimum set of mechanical properties among all composites manufactured.
Dimitrios Deligiannis - One of the best experts on this subject based on the ideXlab platform.
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wet Chemical Treatment for improved surface passivation of textured silicon heterojunction solar cells
Energy Procedia, 2014Co-Authors: Dimitrios Deligiannis, Spyrido Alivizatos, Andrea Ingenito, Dong Zhang, Martij Van Sebille, Rene A C M M Van Swaaij, Miro ZemaAbstract:Silicon heterojunction (SHJ) solar cells constantly gain more attention due to their low cost and relatively high efficiency. An important aspect of these solar cells is the incorporation of intrinsic hydrogenated amorphous silicon (a-Si:H) layers at each side of the c-Si wafer, which has increased the efficiency potential due to the excellent surface passivation. By applying a randomly textured instead of a double-side polished wafer, optical enhancement is achieved resulting in significant reflection reduction and high short-circuit current densities (Jsc). However, texturing-induced defects lead to an a-Si:H/c-Si interface with increased recombination, which limits the open circuit voltage (Voc) of the SHJ device after using the same cleaning Treatment as for the flat wafer. Thus, a one-to-one transfer of process parameters from flat to textured c-Si substrate is not necessarily appropriate and a different wet-Chemical Treatment is needed. In this work, a Chemical Treatment is demonstrated, which leads to an improved surface passivation.