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首页> 外文期刊>Physical review, E >Alternative mechanism for coffee-ring deposition based on active role of free surface
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Alternative mechanism for coffee-ring deposition based on active role of free surface

机译：基于自由表面积极作用的咖啡环沉积的替代机制

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摘要

When a colloidal sessile droplet dries on a substrate, the particles suspended in it usually deposit in a ringlike pattern. This phenomenon is commonly referred to as the "coffee-ring" effect. One paradigm for why this occurs is as a consequence of the solutes being transported towards the pinned contact line by the flow inside the drop, which is induced by surface evaporation. From this perspective, the role of the liquid-gas interface in shaping the deposition pattern is somewhat minimized. Here, we propose an alternative mechanism for the coffee-ring deposition. It is based on the bulk flow within the drop transporting particles to the interface where they are captured by the receding free surface and subsequently transported along the interface until they are deposited near the contact line. That the interface captures the solutes as the evaporation proceeds is supported by a Lagrangian tracing of particles advected by the flow field within the droplet. We model the interfacial adsorption and transport of particles as a one-dimensional advection-generation process in toroidal coordinates and show that the theory reproduces ring-shaped depositions. Using this model, deposition patterns on both hydrophilic and hydrophobic surfaces are examined in which the evaporation is modeled as being either diffusive or uniform over the surface.
机译：当胶体柄液滴在基板上干燥时，悬浮在其中的颗粒通常以环形图案沉积。这种现象通常被称为“咖啡环”效应。为什么发生这种范式的是，由于液滴内部的流动朝向固定的接触线传送的溶质，这是通过表面蒸发诱导的。从这种角度来看，液体气体接口在成形沉积图案中的作用稍微最小化。在这里，我们提出了一种替代机构，用于咖啡环沉积。它基于下落内的散装流量，将颗粒输送到界面，其中它们被取出的自由表面捕获并随后沿界面输送，直到它们沉积在接触线附近。该接口捕获溶质，因为蒸发所需的蒸发追踪由液滴内的流场方向的粒子的拉格朗日追踪支持。我们将粒子的界面吸附和运输模拟作为环形坐标中的一维的平流发电过程，并表明该理论再现环形沉积。使用该模型，检查了亲水和疏水表面上的沉积图案，其中蒸发被建模为在表面上扩散或均匀。

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