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Polymeric membrane studied using slow positron beam |
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| Authors: | Wei-Song Hung Chia-Hao Lo Mei-Ling Cheng Hongmin Chen Lakshmi Chakka Kuo-Lun Tung Shu-Hsien Huang Kueir-Rarn Lee Juin-Yih Lai Yi-Ming Sun Chang-Cheng Yu Renwu Zhang |
| Institution: | a R&D Center for Membrane Technology, Chung Yuan Christian University, Chung-Li 32023, Taiwan b Department of Chemical Engineering, Chung Yuan Christian University, Chung-Li 32023, Taiwan c Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110, United States d Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li 32003, Taiwan e Department of Physics, Chung Yuan Christian University, Chung-Li 32023, Taiwan f Physical Science Department, Southern Utah University, Cedar City, UT 84720, United States |
| Abstract: | A radioisotope slow positron beam has been built at the Chung Yuan Christian University in Taiwan for the research and development in membrane science and technology. Doppler broadening energy spectra and positron annihilation lifetime have been measured as a function of positron energy up to 30 keV in a polyamide membrane prepared by the interfacial polymerization between triethylenetetraamine (TETA) and trimesoyl chloride (TMC) on modified porous polyacrylonitrile (PAN) asymmetric membrane. The multilayer structures and free-volume depth profile for this asymmetric membrane system are obtained. Positron annihilation spectroscopy coupled with a slow beam could provide new information about size selectivity of transporting molecules and guidance for molecular designs in polymeric membranes. |
| Keywords: | 82 30 Gg 87 80 &minus y 82 80 &minus d 87 83 +a |
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