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Title of article :
Applications of positron annihilation spectroscopy to polymeric membranes Original Research Article
Author/Authors :
Y.C. Jean، نويسنده , , Wei-Song Hung، نويسنده , , Chia-Hao Lo، نويسنده , , Hongmin Chen، نويسنده , , Guang Liu، نويسنده , , Lakshmi Chakka، نويسنده , , Mei-Ling Cheng، نويسنده , , D. Nanda، نويسنده , , Kuo-Lun Tung، نويسنده , , Shu-Hsien Huang، نويسنده , , Kueir-Rarn Lee، نويسنده , , Juin-Yih Lai، نويسنده , , Yi-Ming Sun، نويسنده , , Chien-Chieh Hu، نويسنده , , Chang-Cheng Yu، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
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Abstract :
Positron annihilation spectroscopy (PAS) coupled with a slow positron beam has been used to study the freevolume depth profile (0–10 μm) in polymeric membrane systems prepared by the interfacial polymerization method. Doppler broadening energy parameters of annihilation radiation vary as a function of the depth from the surface through multi-layers in polyamide asymmetric membranes prepared under different experimental parameters, such as the time, the temperature, and pH of membrane preparation process of interfacial polymerization. Three layer structures including a skin, a transition, and the porous layers in those asymmetric membrane systems are obtained. Positron annihilation lifetime results provide additional information about free-volume size and distribution in nano- and micro-scale film membrane systems. PAS results are correlated with the pervaporation separation, flux and water wt% in permeate of 70% isopropanol aqueous solution and compared with the SEM images.
Keywords :
Free volume , Interfacial polymerization , Polymeric membrane , Positron annihilation spectroscopy , Slow positron beam
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