CONACYT - Universidad de Quintana Roo, Boulevar Bahía s/n, Chetumal, 77019, Quintana Roo, Mexico.
Soft Matter. 2017 May 24;13(20):3822-3830. doi: 10.1039/c7sm00467b.
We study the static and dynamic interaction between a horizontal cylindrical nano-probe and a thin liquid film. The effects of the physical and geometrical parameters, with a special focus on the film thickness, the probe speed, and the distance between the probe and the free surface are analyzed. Deformation profiles have been computed numerically from a Reynolds lubrication equation, coupled to a modified Young-Laplace equation, which takes into account the probe/liquid and the liquid/substrate non-retarded van der Waals interactions. We have found that the film thickness and the probe speed have a significant effect on the threshold separation distance below which the jump-to-contact instability is triggered. These results encourage the use of horizontal cylindrical nano-probes to scan thin liquid films, in order to determine either the physical or geometrical properties of the latter, through the measurement of interaction forces.
我们研究了水平圆柱形纳米探针与薄液膜之间的静态和动态相互作用。分析了物理和几何参数的影响，特别关注膜厚、探针速度以及探针与自由表面之间的距离。从考虑探针/液体和液体/基底非滞后范德华相互作用的修正的 Young-Laplace 方程耦合的雷诺润滑方程中数值计算了变形轮廓。我们发现，膜厚和探针速度对触发接触跳跃不稳定性的阈值分离距离有显著影响。这些结果鼓励使用水平圆柱形纳米探针扫描薄液膜，以便通过测量相互作用力来确定后者的物理或几何性质。
