文献类型：期刊文献

英文题名：Improving water transport through sub-nanometer channels by alternating hydrophilic-hydrophobic patterns

作者：Xu, Fang[1];Lei, Linfeng[1];Lian, Cheng[1];Xu, Zhi[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：69

期号：7

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20230813624043);WOS:【SCI-EXPANDED(收录号:WOS:000934645600001)】；

基金：ACKNOWLEDGMENTS This work was sponsored by Shanghai Sailing Program (21YF1409600), China Postdoctoral Science Foundation (2021M700042), and the National Natural Science Foundation of China (22208092, 22075076).

语种：英文

外文关键词：covalent organic framework (COF); hydrophilicity; hydrophobicity; nonequilibrium molecular dynamics; water transport

摘要：Hydrophilicity is key factor to sub-nanometer channels for water transport. However, how to effectively integrate the respective advantages of hydrophilicity and hydrophobicity to realize ultrafast water transport at the sub-nanometer scale is still confusing. By using sub-nanometer channels formed by two-dimensional covalent organic frameworks as typical models, we herein demonstrate that alternating hydrophilic-hydrophobic patterns in channels are capable of significantly improving water transport. Alternatingly stacking hydrophilic and hydrophobic monolayers is testified to be energetically favorable to directly piling their multilayers. Meanwhile, alternatingly-stacked hydrophilic-hydrophobic multilayers are able to achieve much higher water permeability than individual hydrophilic or hydrophobic multilayers. The effect of framework flexibility is also investigated. The exceptional performances benefit from the perfect balance between excellent wettability of hydrophilicity and low friction of hydrophobicity. In order to give full play to the synergistic advantages, the thickness of hydrophobic patterns spaced by hydrophilic ones should be less than 1 nm.