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Separating Oil-Water Nanoemulsions using Flux-Enhanced Hierarchical Membranes

Author(s)
Solomon, Brian Richmond; Hyder, Md Nasim; Varanasi, Kripa K.
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Abstract
Membranes that separate oil-water mixtures based on contrasting wetting properties have recently received significant attention. Separation of nanoemulsions, i.e. oil-water mixtures containing sub-micron droplets, still remains a key challenge. Tradeoffs between geometric constraints, high breakthrough pressure for selectivity, high flux, and mechanical durability make it challenging to design effective membranes. In this paper, we fabricate a hierarchical membrane by the phase inversion process that consists of a nanoporous separation skin layer supported by an integrated microporous layer. We demonstrate the separation of water-in-oil emulsions well below 1 μm in size. In addition, we tune the parameters of the hierarchical membrane fabrication to control the skin layer thickness and increase the total flux by a factor of four. These simple yet robust hierarchical membranes with engineered wetting characteristics show promise for large-scale, efficient separation systems.
Date issued
2014-07
URI
http://hdl.handle.net/1721.1/89465
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Solomon, Brian R., Md. Nasim Hyder, and Kripa K. Varanasi. “Separating Oil-Water Nanoemulsions Using Flux-Enhanced Hierarchical Membranes.” Sci. Rep. 4 (July 1, 2014).
Version: Final published version
ISSN
2045-2322

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