论文标题
带有微米大小颗粒的液体界面的表面压力
Surface Pressure of Liquid Interfaces Laden with Micron-Sized Particles
论文作者
论文摘要
我们考虑了充满胶体的液体界面的表面压力。由于具有合适润湿性的微米大小的颗粒可以不可逆地与实验时间尺度上的液体界面结合，因此，我们使用规范合奏来得出胶体中充满胶体界面的表面压力的表达。我们使用此表达式表明，仅具有硬核相互作用的颗粒吸附对典型的langmuir-arfor量测量的表面压力的影响可忽略不计。此外，我们表明Langmuir-Frough的测量不能用于提取典型的粒子势。最后，我们认为，测得的表面压力对表面分数的依赖性可以通过低至中间粒子表面分数的粒子配位数来解释。在高表面分数下，颗粒被堵塞并且无法轻易重新排列，液体界面的接触线滑动和/或变形在颗粒的长度尺度上起着关键作用。
We consider the surface pressure of a colloid-laden liquid interface. As micron-sized particles of suitable wettability can be irreversibly bound to the liquid interface on experimental timescales, we use the canonical ensemble to derive an expression for the surface pressure of a colloid-laden interface. We use this expression to show that adsorption of particles with only hard-core interactions has a negligible effect on surface pressures from typical Langmuir-trough measurements. Moreover, we show that Langmuir-trough measurements cannot be used to extract typical interparticle potentials. Finally, we argue that the dependence of measured surface pressure on surface fraction can be explained by particle coordination number at low to intermediate particle surface fractions. At high surface fractions, where the particles are jammed and cannot easily rearrange, contact-line sliding and/or deformations of the liquid interface at the length scale of the particles play a pivotal role.
