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Homayoun Moaddel - One of the best experts on this subject based on the ideXlab platform.
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direct methanol fuel cell performance of sulfonated poly 2 6 dimethyl 1 4 phenylene oxide polybenzimidazole blend proton exchange Membranes
International Journal of Hydrogen Energy, 2011Co-Authors: Amir Hossein Haghighi, Mohammad Mahdi Hasanisadrabadi, Shahriar Hojjati Emami, Erfan Dashtimoghadam, Ghasem Bahlakeh, Seyyed Emadodin Shakeri, Fatemeh Sadat Majedi, Homayoun MoaddelAbstract:Various sulfonated poly (2,6-dimethyl-1,4-phenylene oxide) (SPPO)-polybenzimidazole (PBI) blend Membranes were prepared and investigated as proton exchange Membranes (PEMs) for direct methanol fuel cell (DMFC) applications. With increasing PBI content water swelling, ion exchange capacity, proton conductivity and methanol permeability of SPPO-PBI Membranes were found to be decreased due to acid-base interactions between sulfonate and the amine groups of the blended components. Among various SPPO-PBI blend Membranes, 80:20 wt% was found as the optimum composition, which showed the highest Membrane Selectivity parameter. Direct methanol-air single fuel cell tests revealed a higher cell efficiency of 11.6% for SPPO80-PBI20 than 10.9% for Nafion (R) 117 at 5 M methanol feed, and also a higher power density of 57.6 mW.cm(-2) compared to 39.4 mW.cm(-2) for Nafion (R) 117. Transport properties as well as DMFC performance results of SPPO-PBI blend PEMs converge to indicate their potential for DMFC applications. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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preparation and characterization of nanocomposite Membranes made of poly 2 6 dimethyl 1 4 phenylene oxide and montmorillonite for direct methanol fuel cells
Journal of Power Sources, 2008Co-Authors: Mohammad Mahdi Hasanisadrabadi, Shahriar Hojjati Emami, Homayoun MoaddelAbstract:Abstract Partially sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (sulfonated PPO) with various degrees of sulfonation were prepared. The solutions were mixed with organically modified montmorillonite (MMT) to prepare Membranes by solvent casting. By increasing the sulfonation degree up to 40% for Membranes without MMT, ion exchange capacity, water uptake and proton conductivity reached 2.59 mequiv. g −1 , 21% and 0.0182 S cm −1 , respectively. The Fourier transfer infrared (FTIR) analysis of sulfonated Membranes revealed absorption bands at 1060 and 1100–1300 cm −1 for sulfur–oxygen S O bonds. X-ray diffraction analysis showed the exfoliated structure of clay in polymeric matrices. A sulfonated PPO/MMT Membrane with 27% sulfonation and 2.0 wt% MMT loading showed a Membrane Selectivity of approximately 63,500 compared to 40,500 for Nafion ® 117, and also a higher power density (125 mW cm −2 ) than Nafion ® 117 (108 mW cm −2 ) for single cell DMFC in a 5 M methanol feed.
Mohammad Mahdi Hasanisadrabadi - One of the best experts on this subject based on the ideXlab platform.
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direct methanol fuel cell performance of sulfonated poly 2 6 dimethyl 1 4 phenylene oxide polybenzimidazole blend proton exchange Membranes
International Journal of Hydrogen Energy, 2011Co-Authors: Amir Hossein Haghighi, Mohammad Mahdi Hasanisadrabadi, Shahriar Hojjati Emami, Erfan Dashtimoghadam, Ghasem Bahlakeh, Seyyed Emadodin Shakeri, Fatemeh Sadat Majedi, Homayoun MoaddelAbstract:Various sulfonated poly (2,6-dimethyl-1,4-phenylene oxide) (SPPO)-polybenzimidazole (PBI) blend Membranes were prepared and investigated as proton exchange Membranes (PEMs) for direct methanol fuel cell (DMFC) applications. With increasing PBI content water swelling, ion exchange capacity, proton conductivity and methanol permeability of SPPO-PBI Membranes were found to be decreased due to acid-base interactions between sulfonate and the amine groups of the blended components. Among various SPPO-PBI blend Membranes, 80:20 wt% was found as the optimum composition, which showed the highest Membrane Selectivity parameter. Direct methanol-air single fuel cell tests revealed a higher cell efficiency of 11.6% for SPPO80-PBI20 than 10.9% for Nafion (R) 117 at 5 M methanol feed, and also a higher power density of 57.6 mW.cm(-2) compared to 39.4 mW.cm(-2) for Nafion (R) 117. Transport properties as well as DMFC performance results of SPPO-PBI blend PEMs converge to indicate their potential for DMFC applications. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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preparation and characterization of nanocomposite Membranes made of poly 2 6 dimethyl 1 4 phenylene oxide and montmorillonite for direct methanol fuel cells
Journal of Power Sources, 2008Co-Authors: Mohammad Mahdi Hasanisadrabadi, Shahriar Hojjati Emami, Homayoun MoaddelAbstract:Abstract Partially sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (sulfonated PPO) with various degrees of sulfonation were prepared. The solutions were mixed with organically modified montmorillonite (MMT) to prepare Membranes by solvent casting. By increasing the sulfonation degree up to 40% for Membranes without MMT, ion exchange capacity, water uptake and proton conductivity reached 2.59 mequiv. g −1 , 21% and 0.0182 S cm −1 , respectively. The Fourier transfer infrared (FTIR) analysis of sulfonated Membranes revealed absorption bands at 1060 and 1100–1300 cm −1 for sulfur–oxygen S O bonds. X-ray diffraction analysis showed the exfoliated structure of clay in polymeric matrices. A sulfonated PPO/MMT Membrane with 27% sulfonation and 2.0 wt% MMT loading showed a Membrane Selectivity of approximately 63,500 compared to 40,500 for Nafion ® 117, and also a higher power density (125 mW cm −2 ) than Nafion ® 117 (108 mW cm −2 ) for single cell DMFC in a 5 M methanol feed.
Yinhua Wan - One of the best experts on this subject based on the ideXlab platform.
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Sharpening Nanofiltration: Strategies for Enhanced Membrane Selectivity.
ACS Applied Materials & Interfaces, 2020Co-Authors: Huiru Zhang, Jianquan Luo, Yinhua Wan, Seth B DarlingAbstract:Nanofiltration plays an increasingly large role in many industrial applications, such as water treatment (e.g., desalination, water softening, and fluoride removal) and resource recovery (e.g., alkaline earth metals). Energy consumption and benefits of nanofiltration processes are directly determined by the Selectivity of the nanofiltration Membranes, which is largely governed by pore-size distribution and Donnan effects. During operation, the separation performance of unmodified nanofiltration Membranes will also be impacted (deleteriously) upon unavoidable Membrane fouling. Many efforts, therefore, have been directed toward enhancing the Selectivity of nanofiltration Membranes, which can be classified into Membrane fabrication method improvement and process intensification. This review summarizes recent developments in the field and provides guidance for potential future approaches to improve the Selectivity of nanofiltration Membranes.
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separation performance of novel vinyltriethoxysilane vtes g silicalite 1 pdms pan thin film composite Membrane in the recovery of bioethanol from fermentation broths by pervaporation
Journal of Membrane Science, 2017Co-Authors: Yinhua WanAbstract:Abstract Organophilic pervaporation (OPV) has been considered as one of the most promising separation processes for the recovery of biofuels from fermentation broths, however, in addition to preferred target product – liquid biofuels, the yeast cells and fermentation nutrients could affect the recovery efficiency of biofuels from broths by pervaporation. In this paper, the influence of the yeast cells and the fermentation nutrient components such as the sources of carbon, nitrogen and salts on the separation performance of the vinyltriethoxysilane (VTES)-grafted- (VTES-g-) silicalite-1/PDMS/PAN thin-film composite Membrane was conducted systematically. The results revealed that glucose, xylose, protein, and salts cannot permeate through the Membrane. Glucose concentration in the fermentation broth should be kept at a lower level (less than 20 g/L) to eliminate its deleterious influence on ethanol flux and Membrane Selectivity. Xylose and corn steep liquor (CSL) have little effect on the pervaporation performance of the composite Membrane. The addition of NaCl improved the Membrane Selectivity and ethanol flux but slightly lowered down total permeation flux. Adding dry yeast cells to the ethanol solution can enhance the turbulence in the feed mixtures, resulting an increase of the Membrane flux and Selectivity. The pervaporation performance of fermentation broths was also studied. The results showed that the nutrients and the deposition of yeast cells on the Membrane surface didn’t deteriorate the pervaporation performance, indicating excellent fouling resistance of the novel VTES-g-silicalite-1/PDMS/PAN composite Membrane in operation with fermentation broths. The continuous ethanol fermentation can be directly connected to the in-situ pervaporative recovery system without requiring prior removal of yeast cells.
Shahriar Hojjati Emami - One of the best experts on this subject based on the ideXlab platform.
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direct methanol fuel cell performance of sulfonated poly 2 6 dimethyl 1 4 phenylene oxide polybenzimidazole blend proton exchange Membranes
International Journal of Hydrogen Energy, 2011Co-Authors: Amir Hossein Haghighi, Mohammad Mahdi Hasanisadrabadi, Shahriar Hojjati Emami, Erfan Dashtimoghadam, Ghasem Bahlakeh, Seyyed Emadodin Shakeri, Fatemeh Sadat Majedi, Homayoun MoaddelAbstract:Various sulfonated poly (2,6-dimethyl-1,4-phenylene oxide) (SPPO)-polybenzimidazole (PBI) blend Membranes were prepared and investigated as proton exchange Membranes (PEMs) for direct methanol fuel cell (DMFC) applications. With increasing PBI content water swelling, ion exchange capacity, proton conductivity and methanol permeability of SPPO-PBI Membranes were found to be decreased due to acid-base interactions between sulfonate and the amine groups of the blended components. Among various SPPO-PBI blend Membranes, 80:20 wt% was found as the optimum composition, which showed the highest Membrane Selectivity parameter. Direct methanol-air single fuel cell tests revealed a higher cell efficiency of 11.6% for SPPO80-PBI20 than 10.9% for Nafion (R) 117 at 5 M methanol feed, and also a higher power density of 57.6 mW.cm(-2) compared to 39.4 mW.cm(-2) for Nafion (R) 117. Transport properties as well as DMFC performance results of SPPO-PBI blend PEMs converge to indicate their potential for DMFC applications. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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preparation and characterization of nanocomposite Membranes made of poly 2 6 dimethyl 1 4 phenylene oxide and montmorillonite for direct methanol fuel cells
Journal of Power Sources, 2008Co-Authors: Mohammad Mahdi Hasanisadrabadi, Shahriar Hojjati Emami, Homayoun MoaddelAbstract:Abstract Partially sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (sulfonated PPO) with various degrees of sulfonation were prepared. The solutions were mixed with organically modified montmorillonite (MMT) to prepare Membranes by solvent casting. By increasing the sulfonation degree up to 40% for Membranes without MMT, ion exchange capacity, water uptake and proton conductivity reached 2.59 mequiv. g −1 , 21% and 0.0182 S cm −1 , respectively. The Fourier transfer infrared (FTIR) analysis of sulfonated Membranes revealed absorption bands at 1060 and 1100–1300 cm −1 for sulfur–oxygen S O bonds. X-ray diffraction analysis showed the exfoliated structure of clay in polymeric matrices. A sulfonated PPO/MMT Membrane with 27% sulfonation and 2.0 wt% MMT loading showed a Membrane Selectivity of approximately 63,500 compared to 40,500 for Nafion ® 117, and also a higher power density (125 mW cm −2 ) than Nafion ® 117 (108 mW cm −2 ) for single cell DMFC in a 5 M methanol feed.
Fatemeh Sadat Majedi - One of the best experts on this subject based on the ideXlab platform.
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direct methanol fuel cell performance of sulfonated poly 2 6 dimethyl 1 4 phenylene oxide polybenzimidazole blend proton exchange Membranes
International Journal of Hydrogen Energy, 2011Co-Authors: Amir Hossein Haghighi, Mohammad Mahdi Hasanisadrabadi, Shahriar Hojjati Emami, Erfan Dashtimoghadam, Ghasem Bahlakeh, Seyyed Emadodin Shakeri, Fatemeh Sadat Majedi, Homayoun MoaddelAbstract:Various sulfonated poly (2,6-dimethyl-1,4-phenylene oxide) (SPPO)-polybenzimidazole (PBI) blend Membranes were prepared and investigated as proton exchange Membranes (PEMs) for direct methanol fuel cell (DMFC) applications. With increasing PBI content water swelling, ion exchange capacity, proton conductivity and methanol permeability of SPPO-PBI Membranes were found to be decreased due to acid-base interactions between sulfonate and the amine groups of the blended components. Among various SPPO-PBI blend Membranes, 80:20 wt% was found as the optimum composition, which showed the highest Membrane Selectivity parameter. Direct methanol-air single fuel cell tests revealed a higher cell efficiency of 11.6% for SPPO80-PBI20 than 10.9% for Nafion (R) 117 at 5 M methanol feed, and also a higher power density of 57.6 mW.cm(-2) compared to 39.4 mW.cm(-2) for Nafion (R) 117. Transport properties as well as DMFC performance results of SPPO-PBI blend PEMs converge to indicate their potential for DMFC applications. Copyright (C) 2010, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.