Riedo Elisa, Lévy Francis, Brune Harald
Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
Phys Rev Lett. 2002 May 6;88(18):185505. doi: 10.1103/PhysRevLett.88.185505. Epub 2002 Apr 18.
The velocity and humidity dependence of nanoscopic sliding friction has been studied on CrN and diamondlike carbon surfaces with an atomic force microscope. The surface wettability is found to be decisive. Partially hydrophilic surfaces show a logarithmic decrease of friction with increasing velocity, the slope of which varies drastically with humidity, whereas on partially hydrophobic surfaces we confirm the formerly reported logarithmic increase. A model for the thermally activated nucleation of water bridges between tip and sample asperities fully reproduces the experimental data.
利用原子力显微镜研究了CrN和类金刚石碳表面纳米级滑动摩擦的速度和湿度依赖性。发现表面润湿性起决定性作用。部分亲水表面的摩擦力随速度增加呈对数下降，其斜率随湿度变化很大，而在部分疏水表面，我们证实了先前报道的对数增加。一种关于针尖与样品粗糙峰之间水桥热激活成核的模型完全再现了实验数据。
