Centre de Physique Moleculaire Optique et Hertzienne, University Bordeaux I 351 cours de la Liberation, F-33405 Talence, France.
Langmuir. 2009 Oct 20;25(20):12002-5. doi: 10.1021/la902934j.
In this study we present measurements of the hydrodynamic force exerted on a glass sphere glued to an atomic force microscopy (AFM) cantilever approaching a mica surface in water. A large sphere was used to reduce the impact of the cantilever beam on the measurement. An AFM cantilever with large stiffness was used to accurately determine the actual contact position between the sphere and the sample surface. The measured hydrodynamic force with different approach velocities is in good agreement with the Taylor force calculated in the lubrication theory with the no-slip boundary conditions, which verifies that there is no boundary slip on the glass and mica surfaces. Moreover, a detailed procedure of how to subtract the electrostatic double-layer force is presented.
在本研究中，我们展示了对粘在原子力显微镜（AFM）悬臂上的玻璃球在水中接近云母表面时所受流体动力的测量结果。使用大球体可减少悬臂梁对测量的影响。使用具有较大刚度的 AFM 悬臂可准确确定球体与样品表面之间的实际接触位置。用不同的接近速度测量的流体动力与在具有无滑移边界条件的润滑理论中计算的泰勒力吻合得很好，这验证了玻璃和云母表面没有边界滑移。此外，还提出了一种详细的减除静电双层力的方法。
