Precise nanofiltration in a fouling-resistant self-assembled membrane with water-continuous transport pathways

Xunda Feng, Qaboos Imran, Yizhou Zhang, Lucas Sixdenier, Xinglin Lu, Gilad Kaufman, Uri Gabinet, Kohsuke Kawabata, Menachem Elimelech, Chinedum O. Osuji

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Self-assembled materials are attractive for next-generation membranes. However, the need to align selfassembled nanostructures (e.g. cylinders, lamellae) and the narrow stability windows for ordered bicontinuous systems present serious challenges. We propose and demonstrate a novel approach that circumvents these challenges by exploiting size-selective transport in the water-continuous medium of a nanostructured polymer templated from a self-assembled lyotropic H1 mesophase. Optimization of the mesophase composition enables high-fidelity retention of the H1 structure on photoinduced cross-linking. The resulting material is a mechanically robust nanostructured polymer possessing internally and externally cross-linked nanofibrils surrounded by a continuous aqueous medium. Fabricated membranes show size selectivity at the 1- to 2-nm length scale and water permeabilities of ~10 liters m-2 hour-1 bar-1 mm. Moreover, the membranes display excellent antimicrobial properties due to the quaternary ammonium groups on the nanofibril surfaces. These results represent a breakthrough for the potential use of polymerized lyotropic mesophase membranes in practical water purification applications.

Original languageEnglish
Article numbereaav9308
JournalScience Advances
Volume5
Issue number8
DOIs
Publication statusPublished - 2019 Aug 9

ASJC Scopus subject areas

  • General

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