润湿
毛细管作用
半径
材料科学
分离压力
纳米孔
碳纳米管
化学物理
背景(考古学)
分子动力学
纳米技术
管(容器)
毛细管压力
机械
复合材料
化学
多孔介质
物理
古生物学
多孔性
计算化学
生物
计算机科学
计算机安全
作者
Simon Gravelle,Christophe Ybert,Lydéric Bocquet,Laurent Joly
出处
期刊:Physical review
日期:2016-03-24
卷期号:93 (3)
被引量:41
标识
DOI:10.1103/physreve.93.033123
摘要
This work revisits capillary filling dynamics in the regime of nanometric to subnanometric channels. Using molecular dynamics simulations of water in carbon nanotubes, we show that for tube radii below one nanometer, both the filling velocity and the Jurin rise vary nonmonotonically with the tube radius. Strikingly, with fixed chemical surface properties, this leads to confinement-induced reversal of the tube wettability from hydrophilic to hydrophobic for specific values of the radius. By comparing with a model liquid metal, we show that these effects are not specific to water. Using complementary data from slit channels, we then show that they can be described using the disjoining pressure associated with the liquid structuring in confinement. This breakdown of the standard continuum framework is of main importance in the context of capillary effects in nanoporous media, with potential interests ranging from membrane selectivity to mechanical energy storage.
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