Dynamics of imbibition into a pore with a heterogeneous surface.
Dynamics of imbibition into a pore with a heterogeneous surface.
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具有非均质表面的孔隙的吸入动力学。
DOI：
10.1021/la0513149
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J. De Coninck
中科院分区：
文献类型：
--
作者：
G. Martic;T. Blake;J. De Coninck
我们使用大规模分子动力学模拟来研究液体渗透到圆柱孔中的动力学，该圆柱孔具有随机异质表面，包含不同润湿性的区域。我们的结果证实卡西定律很好地描述了异质孔隙中的平衡接触角。与之前研究的均匀孔隙的情况一样，渗透动力学可以通过修正后的 Lucas-Washburn 方程来描述，以包括动态接触角的影响。引起动态接触角的三相线处的耗散可以用摩擦系数来表征。有趣的是，异质表面上的润湿线摩擦力也是不同润湿性区域浓度分数的线性函数，类似于卡西定律。这些结果可以用独立随机游走机制来解释。
We use large-scale molecular dynamics simulations to study the dynamics of liquid penetration into a cylindrical pore having a randomly heterogeneous surface comprising areas of differing wettability. Our results confirm that the equilibrium contact angle in the heterogeneous pore is well described by Cassie's law. As in the case of the uniform pore studied previously, the dynamics of penetration can be described by the Lucas-Washburn equation corrected to include the effect of a dynamic contact angle. The dissipation at the three-phase line, which gives rise to the dynamic contact angle, may be characterized in terms of a friction coefficient. Interestingly, the wetting-line friction on the heterogeneous surface also turns out to be a linear function of the fractional concentration of the areas of different wettability, analogous to Cassie's law. These results can be interpreted in terms of an independent random walk mechanism.