Max Plank Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.
Langmuir. 2010 Dec 7;26(23):18135-43. doi: 10.1021/la103242e. Epub 2010 Nov 10.
The detachment force required to pull a microparticle from an air-liquid interface is measured using atomic force microscopy (AFM) and the colloidal probe technique. Water, solutions of sodium dodecyl sulfate (SDS), and silicone oils are tested in order to study the effects of surface tension and viscosity. Two different liquid geometries are considered: the air-liquid interface of a bubble and a liquid film on a solid substrate. It was shown that detaching particles from liquid films is fundamentally different than from bubbles or drops due to the restricted flow of the liquid phase. Additional force is required to detach a particle from a film, and the maximum force during detachment is not necessarily at the position where the particle breaks away from the interface (as seen in bubble or drop systems). This is due to the dynamics of meniscus formation and viscous effects, which must be considered if the liquid is constrained in a film. The magnitude of these effects is related to the liquid viscosity, film thickness, and detachment speed.
使用原子力显微镜（AFM）和胶体探针技术测量从气液界面拉取微粒子所需的分离力。研究了表面张力和粘度的影响，测试了水、十二烷基硫酸钠（SDS）溶液和硅油。考虑了两种不同的液体几何形状：气泡的气液界面和固体基底上的液膜。结果表明，由于液相的限制流动，从液膜中分离粒子与从气泡或液滴中分离粒子在根本上是不同的。从薄膜中分离粒子需要额外的力，并且在分离过程中最大力不一定在粒子从界面脱离的位置（如在气泡或液滴系统中看到的那样）。这是由于弯月面形成和粘性效应的动力学，必须在液体被限制在薄膜中时考虑这些效应。这些效应的大小与液体粘度、薄膜厚度和分离速度有关。
