Nafion-MPMDMS nanocomposite membranes with low methanol permeability |
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| Affiliation: | 1. ARC Centre for Functional Nanomaterials, School of Engineering and AIBN, University of Queensland, St Lucia, QLD 4072, Australia;2. Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai NSW 2234, Australia;1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China;2. University of the Chinese Academy of Sciences, Beijing, 100039, China;3. Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou, 510080, China;1. Development Center of Technology for Petrochemical Pollution Control and Cleaner Production of Guangdong Universitites, College of Chemical Engineering, Guangdong university of Petrochemical Technology, Maoming, Guangdong, 525000, China;2. Institute of Biomaterial, College of Science, South China Agricultural University, Guangzhou, 510642, China;1. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, United States;2. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;3. Department of Electronic Engineering, The Chinese University of Hong Kong, Shanti, Hong Kong;1. Department of Anatomy and Neurobiology, University of Maryland School of Medicine, 20 Penn Street, HSF-2, 21201 MD, Baltimore, USA;2. Center for Genetic Medicine, Children’s National Medical Center, Washington DC, 111 Michigan Avenue, NW Washington, DC 20010, USA;3. Fischell Department of Bioengineering, University of Maryland, College Park, Kim Engineering Building, College Park, MD 20740, USA;4. School of Biochemistry and Cell Biology, University College Cork, Cavanagh Pharmacy Building 1.28, College Road, Cork, Ireland |
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| Abstract: | In this work Nafion nancomposite membranes have been synthesised using a directed sol–gel synthesis technique with (3-mercaptopropyl) methyldimethoxysilane as the silicon alkoxide precursor. The resulting membranes with 16.7 wt% inorganic content showed a 89% reduction in methanol permeability compared to Nafion 117 at 50 °C. Small angle X-ray scattering data profiles for the nanocomposite membranes were distinctly different to those of unmodified Nafion 117 and showed a distinct upturn at low q. The slope of the curves was approximately −3.5 over the range 0.01 < q < 0.015, suggesting the presence of scattering objects with a mass fractal structure in the range 40–60 nm. Such objects were directly observed by transmission electron microscopy, and indicate an interpenetrated network of inorganic agglomerates and the host Nafion polymer, which significantly decreases the methanol permeability. The membranes may be suitable candidates for use in direct methanol fuel cells. |
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