Contact line deposits in an evaporating drop
Contact line deposits in an evaporating drop
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DOI：
10.1103/physreve.62.756
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发表时间：
2000-07-01
影响因子：
2.4
通讯作者：
Witten, TA
中科院分区：
文献类型：
--
作者：
Deegan, RD;Bakajin, O;Witten, TA
分散在干燥液滴中的固体会迁移到液滴的边缘，形成实心环。这种现象会产生环状污渍，在各种表面、溶剂和溶质中都会发生。在这里，我们表明，迁移是由液滴内的向外流动引起的，这是由蒸发造成的溶剂损失和液滴保持平衡液滴形状和固定边界的几何约束所驱动的。我们描述了一种理论，它可以预测液滴的流动速度、增长速度和溶质的分布。将这些预测与我们的实验结果进行了比较。
Solids dispersed in a drying drop will migrate to the edge of the drop and form a solid ring. This phenomenon produces ringlike stains and occurs for a wide range of surfaces, solvents, and solutes. Here we show that the migration is caused by an outward flow within the drop that is driven by the loss of solvent by evaporation and geometrical constraint that the drop maintain an equilibrium droplet shape with a fixed boundary. We describe a theory that predicts the flow velocity, the rate of growth of the ring, and the distribution of solute within the drop. These predictions are compared with our experimental results.