Biocolloid and Fluid Physics Group, Department of Applied Physics, University of Granada, Campus de Fuentenueva, E-18071 Granada, Spain.
Langmuir. 2011 Aug 2;27(15):9638-43. doi: 10.1021/la201248z. Epub 2011 Jun 28.
Quasi-static experiments using sessile drops and captive bubbles are the most employed methods for measuring advancing and receding contact angles on real surfaces. These observable contact angles are the most easily accessible and reproducible. However, some properties of practical surfaces induce certain phenomena that cause a built-in uncertainty in the estimation of advancing and receding contact angles. These phenomena are well known in surface thermodynamics as stick-slip phenomena. Following the work of Marmur (Marmur, A. Colloids Surf., A 1998, 136, 209-215), where the stick-slip effects were studied with regard to sessile drops and captive bubbles on heterogeneous surfaces, we developed a novel extension of this study by adding the effects of roughness to both methods for contact angle measurement. We found that the symmetry between the surface roughness problem and the chemical heterogeneity problem breaks down for drops and bubbles subjected to stick-slip effects.
使用固着液滴和俘获气泡的准静态实验是测量真实表面前进和后退接触角的最常用方法。这些可观察到的接触角是最容易获得和可重复的。然而，实际表面的某些特性会引起某些现象，导致前进和后退接触角估计的固有不确定性。这些现象在表面热力学中被称为粘滑现象。继 Marmur（Marmur，A. Colloids Surf.，A 1998，136，209-215）的工作之后，我们研究了固着液滴和俘获气泡在非均相表面上的粘滑效应，通过将粗糙度的影响添加到两种测量接触角的方法中，对这项研究进行了新的扩展。我们发现，对于受到粘滑效应影响的液滴和气泡，表面粗糙度问题和化学非均质性问题之间的对称性被打破。
