Unique selectivity trends of highly permeable PAP[5] water channel membranes
Unique selectivity trends of highly permeable PAP[5] water channel membranes
复制标题
高渗透性 PAP[5] 水通道膜的独特选择性趋势
DOI：
10.1039/c8fd00043c
复制
发表时间：
2018
影响因子：
3.4
通讯作者：
Kumar, Manish
中科院分区：
文献类型：
--
作者：
Song, Woochul;Shen, Yue-xiao;Lang, Chao;Saha, Prantik;Zenyuk, Iryna V.;Hickey, Robert J.;Kumar, Manish
人工水通道是生物水通道的一种实用替代方案，用于在稳定和可扩展的架构中实现卓越的水渗透性和选择性。然而，基于通道的膜制造面临着关键的障碍，例如：（1）增加孔密度以实现可测量的渗透性增益，同时保持选择性，以及（2）扩大到实际的膜尺寸以用于应用。最近，我们提出了一种使用肽附加柱[5]芳烃（PAP[5]）人工水通道制备基于通道的膜的技术，解决了上述挑战。这些多层PAP[5]膜（ML-PAP[5]）与具有类似截留分子量的商业膜相比显示出显著改善的水渗透性。然而，由于水通道的独特孔结构和膜的逐层结构，分离行为是独特的，仍然没有完全理解。本文从通道几何形状、离子排斥和线性分子传输的角度讨论了ML-PAP[5]膜的两种独特的选择性趋势。
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.