Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2011.05.048
Title: Development and positron annihilation spectroscopy (PAS) characterization of polyamide imide (PAI)-polyethersulfone (PES) based defect-free dual-layer hollow fiber membranes with an ultrathin dense-selective layer for gas separation
Authors: Li, F.Y. 
Li, Y. 
Chung, T.-S. 
Chen, H.
Jean, Y.C.
Kawi, S. 
Keywords: Defect-free dual-layer hollow fiber membrane
Doppler broadening energy spectra (DBES)
PAI-PES
Positron annihilation spectroscopy (PAS)
Ultrathin dense-selective layer
Issue Date: 15-Aug-2011
Citation: Li, F.Y., Li, Y., Chung, T.-S., Chen, H., Jean, Y.C., Kawi, S. (2011-08-15). Development and positron annihilation spectroscopy (PAS) characterization of polyamide imide (PAI)-polyethersulfone (PES) based defect-free dual-layer hollow fiber membranes with an ultrathin dense-selective layer for gas separation. Journal of Membrane Science 378 (1-2) : 541-550. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2011.05.048
Abstract: Defect-free polymeric dual-layer hollow fiber membranes consisting of an ultrathin dense-selective polyamide imide (PAI) layer and a polyethersulfone (PES) supporting layer have been successfully fabricated in this study for gas separation application. It is observed that a lower outer-layer dope flow rate does not necessarily result in the formation of an ultrathin dense-selective layer upon the PES supporting layer. An optimization in the velocity between the inner-layer and the outer-layer dopes at the exit of the spinneret is essential to minimize additional stresses and defect formation in the outer functional layer. The best gas separation performance of the PAI-PES dual-layer hollow fibers fabricated in this study has an O2/N2 selectivity of 7.73 with a dense-selective layer thickness of 63nm. Positron annihilation spectroscopy (PAS) has been used for the first time to explore the morphology and predict the gas separation performance of PAI-PES based dual-layer hollow fiber membranes. Doppler broadening energy spectra (DBES) from PAS accurately estimate the outer-layer thickness and demonstrate the existence of the multilayered structure of the dual-layer hollow fiber membranes. Besides, the PAS fitted data reveal that the fiber spun under the optimal condition has the densest selective layer, which agrees well with the highest gas-pair selectivity observed under this condition. © 2011 Elsevier B.V.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/88753
ISSN: 03767388
DOI: 10.1016/j.memsci.2011.05.048
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

34
checked on Jul 17, 2018

WEB OF SCIENCETM
Citations

33
checked on Jun 27, 2018

Page view(s)

65
checked on Jun 14, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.