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Unique selectivity trends of highly permeable PAP[5] water channel membranes

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Abstract

Artificial water channels are a practical alternative to biological water channels for achieving exceptional water permeability and selectivity in a stable and scalable architecture. However, channel-based membrane fabrication faces critical barriers such as: (1) increasing pore density to achieve measurable gains in permeability while maintaining selectivity, and (2) scale-up to practical membrane sizes for applications. Recently, we proposed a technique to prepare channel-based membranes using peptide-appended pillar[5]arene (PAP[5]) artificial water channels, addressing the above challenges. These multi-layered PAP[5] membranes (ML-PAP[5]) showed significantly improved water permeability compared to commercial membranes with similar molecular weight cut-offs. However, due to the distinctive pore structure of water channels and the layer-by-layer architecture of the membrane, the separation behavior is unique and was still not fully understood. In this paper, two unique selectivity trends of ML-PAP[5] membranes are discussed from the perspectives of channel geometry, ion exclusion, and linear molecule transport.

Graphical abstract: Unique selectivity trends of highly permeable PAP[5] water channel membranes

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Publication details

The article was received on 19 Feb 2018, accepted on 05 Apr 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8FD00043C
Citation: Faraday Discuss., 2018, Advance Article
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    Unique selectivity trends of highly permeable PAP[5] water channel membranes

    W. Song, Y. Shen, C. Lang, P. Saha, Iryna V. Zenyuk, R. J. Hickey and M. Kumar, Faraday Discuss., 2018, Advance Article , DOI: 10.1039/C8FD00043C

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