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Appl. Sci. 2017, 7(2), 181; doi:10.3390/app7020181

Improving Liquid Entry Pressure of Polyvinylidene Fluoride (PVDF) Membranes by Exploiting the Role of Fabrication Parameters in Vapor-Induced Phase Separation VIPS and Non-Solvent-Induced Phase Separation (NIPS) Processes

Department of Chemical and Environmental Engineering, Masdar Institute of Science and Technology, P.O. Box 54224 Abu Dhabi, UAE
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Author to whom correspondence should be addressed.
Academic Editor: Enrico Drioli
Received: 25 December 2016 / Revised: 2 February 2017 / Accepted: 4 February 2017 / Published: 14 February 2017
(This article belongs to the Special Issue Membrane Distillation)
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Abstract

Polyvinylidene fluoride (PVDF) is a popular polymer material for making membranes for several applications, including membrane distillation (MD), via the phase inversion process. Non-solvent-induced phase separation (NIPS) and vapor-induced phase separation (VIPS) are applied to achieve a porous PVDF membrane with low mass-transfer resistance and high contact angle (hydrophobicity). In this work, firstly, the impacts of several preparation parameters on membrane properties using VIPS and NIPS were studied. Then, the performance of the selected membrane was assessed in a lab-scale direct-contact MD (DCMD) unit. The parametric study shows that decreasing PVDF concentration while increasing both relative humidity (RH) and exposure time increased the contact angle and bubble-point pore size (BP). Those trends were investigated further by varying the casting thickness. At higher casting thicknesses and longer exposure time (up to 7.5 min), contact angle (CA) increased but BP significantly decreased. The latter showed a dominant trend leading to liquid entry pressure (LEP) increase with thickness. View Full-Text
Keywords: membrane distillation; polyvinylidene fluoride; hydrophobic; non-solvent-induced phase separation; vapor-induced phase separation membrane distillation; polyvinylidene fluoride; hydrophobic; non-solvent-induced phase separation; vapor-induced phase separation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Abdulla AlMarzooqi, F.; Roil Bilad, M.; Ali Arafat, H. Improving Liquid Entry Pressure of Polyvinylidene Fluoride (PVDF) Membranes by Exploiting the Role of Fabrication Parameters in Vapor-Induced Phase Separation VIPS and Non-Solvent-Induced Phase Separation (NIPS) Processes. Appl. Sci. 2017, 7, 181.

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