https://scholars.lib.ntu.edu.tw/handle/123456789/410487
標題: | Characterization of multilayer nanofiltration membranes using positron annihilation spectroscopy | 作者: | Tung K.-L. Jean Y.-C. Nanda D. Lee K.-R. Hung W.-S. Lo C.-H. Lai J.-Y. |
關鍵字: | Membrane characterization;Nanofiltration;Pore size distribution;Positron annihilation spectroscopy;Slow positron beam | 公開日期: | 2009 | 卷: | 343 | 期: | 1-2 | 起(迄)頁: | 147-156 | 來源出版物: | Journal of Membrane Science | 摘要: | Positron annihilation spectroscopy (PAS) coupled with a slow positron beam was used to characterize in situ the layer structure and depth profile of the cavity size in thin film composite (TFC) polyamide nanofiltration (NF) membranes prepared by the interfacial polymerization method. Two techniques, using PAS coupled with a slow positron beam of Doppler broadening energy spectra (DBES) and positron annihilation lifetime spectroscopy (PALS) designed to reveal the layer structure and the cavity sizes contained in a multilayer thin film composite NF membrane, were assessed. To the best knowledge of the authors, a characterization of the depth profile of cavities in NF membranes using PAS coupled with a slow positron beam has never been reported. The membranes selected have a composite structure containing three layers: a selective polyamide layer, a transition layer, and a porous support prepared by the phase inversion technique. Furthermore, the cavity size distribution in the selective top layer plays an important role in determining the performance of the NF membranes. ? 2009 Elsevier B.V. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/410487 | ISSN: | 03767388 | DOI: | 10.1016/j.memsci.2009.07.020 |
顯示於: | 化學工程學系 |
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