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Issue 46, 2015
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An ultrathin bilayer membrane with asymmetric wettability for pressure responsive oil/water emulsion separation

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Abstract

Superwetting membranes offer a good platform for oil/water separation, but the generation of responsive membranes for on-demand oil/water emulsion separation with both high permeation flux and selectivity is still a challenge. Herein, bilayer membranes that feature asymmetric wettability across the membrane thickness are constructed, simply by depositing a thin layer of polydopamine-coated single-walled carbon nanotubes (SWCNTs) and subsequently coating with a SWCNT layer. When a low applied pressure difference across the membrane, Papplied, is utilized, the hydrophobic–superoleophilic surface is critical for the separation of surfactant-stabilized water-in-oil emulsions. Triggered by an intensive Papplied, surfactant-stabilized oil-in-water emulsions can also be fully separated by a synergistic effect of dual layers. Such ultrathin bilayer membranes exhibit ultrahigh permeation flux and separation efficiency with excellent antifouling for both water-in-oil and oil-in-water emulsion separation in a single-unit, which is readily achieved by the modulation of Papplied. Therefore, we envision that our bilayer membranes show great potential in oil/water emulsion separation.

Graphical abstract: An ultrathin bilayer membrane with asymmetric wettability for pressure responsive oil/water emulsion separation

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Supplementary files

Article information


Submitted
02 Jun 2015
Accepted
13 Oct 2015
First published
14 Oct 2015

J. Mater. Chem. A, 2015,3, 23477-23482
Article type
Paper

An ultrathin bilayer membrane with asymmetric wettability for pressure responsive oil/water emulsion separation

L. Hu, S. Gao, Y. Zhu, F. Zhang, L. Jiang and J. Jin, J. Mater. Chem. A, 2015, 3, 23477
DOI: 10.1039/C5TA03975D

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