https://scholars.lib.ntu.edu.tw/handle/123456789/406383
Title: | A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS)-Evidence and mechanism of formation | Authors: | Menut P. Su Y.S. Chinpa W. Pochat-Bohatier C. Deratani A. Wang D.M Huguet P. Kuo C.Y. Lai J.Y. Dupuy C. |
Keywords: | In situ analysis;Membrane morphology;Poly(ether-imide);Surface liquid layer;Vapor-induced phase separation | Issue Date: | 2008 | Journal Volume: | 310 | Journal Issue: | 1-2 | Start page/Pages: | 278-288 | Source: | Journal of Membrane Science | Abstract: | The formation of a surface liquid layer on the top of membrane forming systems made of poly(ether-imide) (PEI) and N-methylpyrrolidone (NMP) was clearly demonstrated during water vapor-induced phase separation (VIPS) through several in situ investigation methods including optical microscopy and dynamic water contact angle measurements for a qualitative approach, and Raman confocal and FTIR microscopy for a quantitative one. A mechanism involving the shrinkage from the polymer-rich phase consecutively to the surface phase separation is proposed to account for the significantly high concentration of PEI in the surface liquid layer. The emergence of a surface liquid layer during the phase separation process is discussed in terms of implications on morphology of membrane fabricated using VIPS and how it contrasts with liquid-induced phase separation. ? 2007 Elsevier B.V. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/406383 | ISSN: | 03767388 | DOI: | 10.1016/j.memsci.2007.11.016 |
Appears in Collections: | 化學工程學系 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.