Katainen J, Paajanen M, Ahtola E, Pore V, Lahtinen J
Laboratory of Physics, Helsinki University of Technology, PO Box 1100, FI-02015 TKK, Finland.
J Colloid Interface Sci. 2006 Dec 15;304(2):524-9. doi: 10.1016/j.jcis.2006.09.015. Epub 2006 Sep 14.
Surface roughness plays an important role in the adhesion of small particles. In this paper we have investigated adhesion as a geometrical effect taking into account both the particle size and the size of the surface features. Adhesion is studied using blunt model particles on surfaces up to 10 nm root-mean-square (RMS) roughness. Measurements with particles both smaller and larger than surface features are presented. Results indicate different behavior in these areas. Adhesion of particles smaller than or similar in size to the asperities depend mainly on the size and shape of the asperities and only weakly on the size of the particle. For large particles also the particle size has a significant effect on the adhesion. A new model, which takes the relative size of particles and asperities into account, is also derived and compared to the experimental data. The proposed model predicts adhesion well over a wide range of particle/asperity length scales.
表面粗糙度在小颗粒的黏附中起着重要作用。在本文中，我们将黏附作为一种几何效应进行了研究，同时考虑了颗粒尺寸和表面特征尺寸。使用均方根（RMS）粗糙度高达10纳米的表面上的钝头模型颗粒来研究黏附。给出了颗粒尺寸小于和大于表面特征尺寸时的测量结果。结果表明这些区域存在不同的行为。尺寸小于或与微凸体相似的颗粒的黏附主要取决于微凸体的尺寸和形状，而对颗粒尺寸的依赖性较弱。对于大颗粒，颗粒尺寸对黏附也有显著影响。还推导了一个考虑颗粒和微凸体相对尺寸的新模型，并将其与实验数据进行了比较。所提出的模型在很宽的颗粒/微凸体长度尺度范围内都能很好地预测黏附情况。
