Achieving high permeability and enhanced selectivity for Angstrom-scale separations using artificial water channel membranes.

Achieving high permeability and enhanced selectivity for Angstrom-scale separations using artificial water channel membranes.
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DOI:
10.1038/s41467-018-04604-y
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发表时间:
2018-06-12
影响因子:
16.6
通讯作者:
Kumar M
Kumar M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Shen YX;Song W;Barden DR;Ren T;Lang C;Feroz H;Henderson CB;Saboe PO;Tsai D;Yan H;Butler PJ;Bazan GC;Phillip WA;Hickey RJ;Cremer PS;Vashisth H;Kumar M

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Synthetic polymer membranes, critical to diverse energy-efficient separations, are subject to permeability-selectivity trade-offs that decrease their overall efficacy. These trade-offs are due to structural variations (e.g., broad pore size distributions) in both nonporous membranes used for Angstrom-scale separations and porous membranes used for nano to micron-scale separations. Biological membranes utilize well-defined Angstrom-scale pores to provide exceptional transport properties and can be used as inspiration to overcome this trade-off. Here, we present a comprehensive demonstration of such a bioinspired approach based on pillar[5]arene artificial water channels, resulting in artificial water channel-based block copolymer membranes. These membranes have a sharp selectivity profile with a molecular weight cutoff of ~ 500 Da, a size range challenging to achieve with current membranes, while achieving a large improvement in permeability (~65 L m−2 h−1 bar−1 compared with 4–7 L m−2 h−1 bar−1) over similarly rated commercial membranes. Synthetic polymeric membranes used for separations suffer from permeability-selectivity trade-offs. Here the authors demonstrate how a bioinspired pillar[5]arene artificial water channel embedded in a copolymer membrane can improve selectivity while still achieving high permeability.
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