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. 2019 Jul 8;11(7):1160. doi: 10.3390/polym11071160

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Membrane cross-section morphology of PS hollow fibers prepared with an ambient relative humidity of 30% for different air gap length (cm): (A) 0 cm, (B) 10 cm, (C) 20 cm, (D) 30 cm, (E) 40 cm, (F) 50 cm and (G) 60 cm, adapted from [191].