Brownian motion on an out-of-thermal-equilibrium surface,Physical Review E

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Brownian motion on an out-of-thermal-equilibrium surface
Physical Review E ( IF 2.2 ) Pub Date : 2022-09-23 , DOI: 10.1103/physreve.106.034615
María de Jesús Martínez-López ₁ , José Luis Arauz-Lara ₁

Affiliation

The motion of colloidal species on an out-of-thermal equilibrium surface is studied experimentally by optical microscopy. Water droplets of size in the micrometer range, spontaneously formed at a spherical-like interface between water and oil, are the colloidal species. The interface appears as a convex meniscus when putting water on oil with an added nonionic surfactant. Since the water density is greater than that of oil, the interface is produced into the oil. The spontaneously formed water droplets move attached to the interface while still growing from submicrometer sizes to a few micrometers. Although the dynamic nature of the process, with both the interface and the particles still changing, produces heterogeneities in the system, anomalous diffusion was not observed. The motion of the droplets has a well-identified Brownian component with a Gaussian distribution of steps due to the thermal agitation of the media surrounding the droplets and a drift component due to the effect of gravity.

中文翻译：

非热平衡表面上的布朗运动

通过光学显微镜实验研究了非热平衡表面上胶体物质的运动。在水和油之间的球形界面处自发形成的微米级水滴是胶体物质。当将水放在添加了非离子表面活性剂的油上时，界面显示为凸弯月面。由于水的密度大于油的密度，所以界面产生到油中。自发形成的水滴附着在界面上，同时仍从亚微米尺寸增长到几微米。尽管该过程的动态性质（界面和颗粒仍在变化）在系统中产生异质性，但未观察到异常扩散。

更新日期：2022-09-24

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