微球与固支液膜的相互作用。

Interaction of a microsphere with a solid-supported liquid film.

机构信息

Department of Mechanical Engineering, University of Alberta, Edmonton AB, T6G 2G8 Canada.

出版信息

Langmuir. 2010 Jul 20;26(14):11797-803. doi: 10.1021/la1010924.

PMID:20568819

Abstract

The interaction between particles with thin liquid films on solid surfaces was studied by sintering polystyrene microspheres of 4 to 5 microm diameter to the end of atomic force microscope cantilevers. Films of three silicone oils (viscosity 4.6, 9.2, and 9700 mPa s) and water of thickness 0.2-1.8 microm were formed on glass. The interaction between a particle and the film was measured at different particle approach/retraction velocities. The interaction is dominated by capillary and hydrodynamic forces. It depends on the surface tension and the viscosity of the liquid. The film thickness can be determined from the force curves. In addition, the meniscus formation of a film wetting a particle was demonstrated experimentally by solidifying a liquid polystyrene film as it wetted glass particles.

摘要

研究了固体表面上带有薄液膜的颗粒之间的相互作用，方法是将直径为 4 到 5 微米的聚苯乙烯微球烧结到原子力显微镜悬臂的末端。在玻璃上形成了三种硅油（粘度为 4.6、9.2 和 9700 mPa s）和水的厚度为 0.2-1.8 微米的膜。在不同的颗粒接近/缩回速度下测量了颗粒和膜之间的相互作用。相互作用主要由毛细力和流体动力控制。它取决于液体的表面张力和粘度。可以从力曲线上确定薄膜厚度。此外，通过凝固润湿玻璃颗粒的液体聚苯乙烯膜，实验证明了润湿颗粒的膜的弯月面形成。