The effect of surface heterogeneity on the drop size dependence of contact angles
The effect of surface heterogeneity on the drop size dependence of contact angles
复制标题
表面不均匀性对接触角的液滴尺寸依赖性的影响
DOI：
10.1016/0009-2509(95)00117-n
复制
发表时间：
1995
影响因子：
4.7
通讯作者：
Dongqing Li
中科院分区：
文献类型：
--
作者：
F. Lin;Dongqing Li
在实验中观察到不同的水滴大小依赖于接触角的模式。一些研究者报告接触角随着液滴大小的增加而减少，而另一些则报告接触角增加。还有一些人报告说，接触角对液滴大小没有依赖关系。这些现象可以分别用正线张力效应、“负线张力”效应和可忽略线张力效应来解释。此外，一些研究人员观察到他们的接触角数据有很大的波动。“负线张力”和可忽略线张力效应的存在以及接触角的波动可能是由表面非均质性引起的。本文建立了模型1和模型2两个非均质实体模型。模型1采用同心圆模型，表明接触角数据的波动是由于表面非均质性造成的。模型2利用斑块非均质模型说明，在不同的表面非均质程度下，接触角-液滴尺寸关系可以产生三种模式。因此，液滴大小对接触角的不同依赖模式可能至少是由表面非均质性引起的。
Different patterns of drop size dependence of contact angles have been observed experimentally. Some investigators reported a decrease of contact angle with an increase in drop size, while others reported an increase. Still others reported that there is no drop size dependence of contact angles. These phenomena can be explained by positive line tension effect, “negative line tension” effect, and negligible line tension effect, respectively. In addition, some researchers observed significant fluctuations of their contact angle data. The existence of the “negative line tension” and negligible line tension effects and the fluctuation of contact angles may be caused by surface heterogeneity. Two heterogeneous solid models, models 1 and 2, are developed in this paper. Model 1 demonstrates, by using a concentric ring model, that the fluctuations of the contact angle data are due to surface heterogeneity. Model 2 illustrates, by using a patchwise heterogeneous model, that all three patterns of contact angle-drop size relation can be produced with different degrees of surface heterogeneity. The different patterns of drop size dependence of contact angles, therefore, may be caused at least by surface heterogeneity.