文献类型：期刊文献

英文题名：The role of surface wettability on water transport through membranes

作者：Tao, Jiabo[1,2];Song, Xianyu[1,2];Bao, Bo[1,2];Zhao, Shuangliang[1,2];Liu, Honglai[3]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：219

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20201008271792);WOS:【SCI-EXPANDED(收录号:WOS:000530711700017)】；

基金：This work is supported by National Natural Science Foundation of China (Nos. 21808056, 21878078), and by the Shanghai Science and Technology Innovation Action Plan (18160743700).

语种：英文

外文关键词：Molecular transport; Surface wettability; Membrane; Water flux; Mechanism

摘要：The efficiency of membrane separation processes relies on the performance of fluid flow across the membranes. Herein water transport across carbon nanotube membranes is investigated by means of non-equilibrium molecular dynamics simulations. Particularly the interior/exterior surface wetting effects on water flux are examined. We find that the hydrophilic interior and exterior surfaces can both suppress water flux, while the underlying mechanisms are different. Specifically, hydrophilic interior surface promotes the water density inside the nanopores, causing severe two-layer distributed structure, and meanwhile, the annulus layer near the surface becomes packed and ordered, greatly reducing the slipping length; while the hydrophilic exterior surface increases the entrance/exit resistance and suppresses the molecule diffusion near the interface, thus interfering the permeation of water molecules into the membrane. This study provides molecular insights for enhancing water permeation by surface modification of membranes. (C) 2020 Elsevier Ltd. All rights reserved.