Surface pressure of liquid interfaces laden with micron-sized particles.,Soft Matter

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Surface pressure of liquid interfaces laden with micron-sized particles.
Soft Matter ( IF 2.9 ) Pub Date : 2020-09-08 , DOI: 10.1039/d0sm01229g
Rudi Mears ₁ , Iain Muntz ₁ , Job H J Thijssen ₁

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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, in the case of relatively weakly interacting sterically stabilized particles at a liquid interface, 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, we argue that contact-line sliding and/or deformations of the liquid interface at the length scale of the particles might play a pivotal role.

中文翻译：

载有微米级颗粒的液体界面的表面压力。

我们考虑了胶体-液体界面的表面压力。由于具有适当润湿性的微米级颗粒可以在实验时标上不可逆地结合到液体界面上，因此我们使用规范集合来导出胶体-载有界面的表面压力的表达式。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Langmuir槽测量的表面压力的影响可忽略不计。此外，我们表明，朗缪尔波谷测量无法用于提取典型的粒子间电势。最后，在液体界面上相互作用较弱的空间稳定化粒子的情况下，我们认为测得的表面压力对表面分数的依赖性可以用低至中等颗粒表面分数的颗粒配位数来解释。在高表面分数下，颗粒被卡住并且不容易重新排列，我们认为在颗粒的长度尺度上接触线滑动和/或液体界面的变形可能起关键作用。

更新日期：2020-09-16

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