Wettability transparency and the quasiuniversal relationship between hydrodynamic slip and contact angle
Wettability transparency and the quasiuniversal relationship between hydrodynamic slip and contact angle
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DOI：
10.1063/1.4942400
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发表时间：
2016-02
影响因子：
4
通讯作者：
B. Ramos-Alvarado;Satish Kumar;G. Peterson
中科院分区：
文献类型：
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作者：
B. Ramos-Alvarado;Satish Kumar;G. Peterson
通过引入石墨烯包覆表面的润湿性透明概念，探讨了水动力滑移长度与静态接触角之间的标度规律的通用性。对Si（111）、Si（100）和石墨烯涂覆硅表面的液滴润湿性进行平衡分子动力学模拟，以确定在裸表面和涂覆石墨烯表面之间获得相似接触角（润湿性透明度）所需的条件。通过平衡计算确定了硅和石墨烯包覆硅纳米通道的水动力滑移长度。结果表明，滑移-润湿性标度规律可以概括地描述裸硅纳米通道的滑移行为；然而，在疏水条件下，明显偏离了一般的普遍描述。此外，在润湿性透明条件下，观察到水动力滑移的显著差异。或者……
The universality of the scaling laws that correlate the hydrodynamic slip length and static contact angle was investigated by introducing the concept of the wettability transparency of graphene-coated surfaces. Equilibrium molecular dynamics simulations of droplet wettability for Si(111), Si(100), and graphene-coated silicon surfaces were performed to determine the conditions required to obtain similar contact angles between bare and graphene-coated surfaces (wettability transparency). The hydrodynamic slip length was determined by means of equilibrium calculations for silicon and graphene-coated silicon nanochannels. The results indicate that the slip-wettability scaling laws can be used to describe the slip behavior of the bare silicon nanochannels in general terms; however, clear departures from a general universal description were observed for hydrophobic conditions. In addition, a significant difference in the hydrodynamic slippage was observed under wettability transparency conditions. Alternatively...