Effect of contact angle hysteresis on the measurement of capillary forces
Effect of contact angle hysteresis on the measurement of capillary forces
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DOI：
10.1021/la702188t
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发表时间：
2008-02-19
期刊：
影响因子：
3.9
通讯作者：
Crosby, A. J.
中科院分区：
文献类型：
--
作者：
De Souza, E. J.;Gao, L. C.;Crosby, A. J.
我们对两个平面刚性基板之间的宏观毛细作用力进行了实验研究，这些力的特征是它们与水的接触角的前进和后退。我们的结果与毛细管方程的数值解所得到的理论预测很好地吻合。在此基础上，通过对毛细管力的测量，研究了接触角滞后现象。我们提供了显示低、中、高接触角滞后的表面的力测量的例子，并比较了更多种类的衬底的结果。最后，我们表明，对于水的情况，在本工作测量的力和速度范围内，粘性的作用是不显著的。
We conduct experimental investigations of macroscopic capillary forces between two flat rigid substrates characterized by their advancing and receding contact angles with water. Our results exhibit excellent agreement with theoretical predictions obtained by the numerical solution of the capillary equation. On the basis of this comparison, we use the measurements of the capillary force to investigate the phenomenon of contact angle hysteresis. We present examples of force measurements for surfaces that display low, moderate, and high contact angle hysteresis and compare results for a larger variety of substrates. Finally, we show that for the case of water, the role of viscosity is insignificant within the range of force and velocity measured in the present work.