Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2004.08.002
Title: Fabrication of dual-layer polyethersulfone (PES) hollow fiber membranes with an ultrathin dense-selective layer for gas separation
Authors: Li, Y. 
Cao, C.
Chung, T.-S. 
Pramoda, K.P.
Keywords: Dual-layer hollow fiber membrane
Gas separation
Heat-treatment
Macrovoids
Polyethersulfone (PES)
Ultrathin dense-selective layer
Issue Date: 1-Dec-2004
Citation: Li, Y., Cao, C., Chung, T.-S., Pramoda, K.P. (2004-12-01). Fabrication of dual-layer polyethersulfone (PES) hollow fiber membranes with an ultrathin dense-selective layer for gas separation. Journal of Membrane Science 245 (1-2) : 53-60. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2004.08.002
Abstract: By using co-extrusion and dry-jet wet-spinning phase-inversion techniques with the aid of heat-treatment at 75°C, we have fabricated dual-layer polyethersulfone (PES) hollow fiber membranes with an ultrathin dense-selective layer of 407 Å. To our best knowledge, this is the thinnest thickness that has ever been reported for dual-layer hollow fiber membranes. The dual-layer hollow fibers have an O 2 permeance of 10.8 GPU and O 2/N 2 selectivity of 6.0 at 25°C. The effects of post heat-treatment on the membrane morphology and gas separation performance were also studied. It was found that heat-treatment at 75°C improves the gas permeance and ideal selectivity, while heat-treatment at 150°C results in a significant reduction in both permeance and selectivity due to the enhanced substructure resistance. SEM pictures confirmed that a higher heat-treatment temperature can significantly reduce pore sizes and the amount of pores in the substructure immediately underneath the dense-selective layer. © 2004 Elsevier B.V. All rights reserved.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/88892
ISSN: 03767388
DOI: 10.1016/j.memsci.2004.08.002
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