Wettability effect on nanoconfined water flow

被引：492

作者：

Wu, Keliu ^{[1
]}

Chen, Zhangxin ^{[1
]}

Li, Jing ^{[2
]}

Li, Xiangfang ^{[2
]}

Xu, Jinze ^{[1
]}

Dong, Xiaohu ^{[1
,2
]}

机构：

[1] Univ Calgary, Dept Chem & Petr Engn, Calgary, AB T2N 1N4, Canada

[2] China Univ Petr, Minist Educ, Key Lab Petr Engn, Beijing 102249, Peoples R China

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2017年 / 114卷 / 13期

基金：

中国国家自然科学基金; 加拿大自然科学与工程研究理事会;

关键词：

nanoconfined water flow; nanopores; wettability; slip; viscosity; FAST MASS-TRANSPORT; CARBON NANOTUBES; HYDROPHOBIC SURFACES; BORON-NITRIDE; LIQUID FLOW; ELECTRON-MICROSCOPY; ENERGY-CONVERSION; NANOPOROUS MEDIA; SOLID-SURFACES; FLUID-FLOW;

D O I：

10.1073/pnas.1612608114

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Understanding and controlling the flow of water confined in nanopores has tremendous implications in theoretical studies and industrial applications. Here, we propose a simple model for the confined water flow based on the concept of effective slip, which is a linear sum of true slip, depending on a contact angle, and apparent slip, caused by a spatial variation of the confined water viscosity as a function of wettability as well as the nanopore dimension. Results from this model show that the flow capacity of confined water is 10(-1) similar to 10(7) times that calculated by the no-slip Hagen-Poiseuille equation for nanopores with various contact angles and dimensions, in agreementwith themajority of 53 different study cases from the literature. This work further sheds light on a controversy over an increase or decrease in flow capacity from molecular dynamics simulations and experiments.

引用

页码：3358 / 3363

页数：6

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