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>Achieving high permeability and enhanced selectivity for Angstrom-scale separations using artificial water channel membranes
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Achieving high permeability and enhanced selectivity for Angstrom-scale separations using artificial water channel membranes
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.
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机译:合成聚合物膜对多种节能分离至关重要,但要进行渗透性-选择性折衷,这会降低其整体功效。这些折衷归因于用于埃规模分离的无孔膜和用于纳米至微米尺度分离的多孔膜的结构变化(例如,宽的孔径分布)。生物膜利用定义明确的埃斯孔大小的孔来提供出色的传输性能,并可以作为克服这种折衷的灵感。在这里,我们对基于支柱[5]芳烃人工水通道的生物启发方法进行全面演示,从而产生基于人工水通道的嵌段共聚物膜。这些膜具有很强的选择性,分子量截留值为〜500 Da,是目前膜难以达到的尺寸范围,同时渗透率也有很大提高(〜65 L m −2 sup> h < sup> −1 sup> bar -1 sup>与4–7 L m −2 sup> h -1 sup> bar −1相比 sup>)。
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