Compound sessile drops
Compound sessile drops
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DOI：
10.1039/c2sm26637g
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发表时间：
2012-01-01
期刊：
影响因子：
3.4
通讯作者：
Chan, Derek Y. C.
中科院分区：
文献类型：
--
作者：
Neeson, Michael J.;Tabor, Rico F.;Chan, Derek Y. C.
复合液滴产生于三种不混溶流体的接触，根据所涉及相的界面化学性质可以呈现各种几何形状。在这里，我们提出了一类新的化合物滴的研究，是固体表面上的无柄。用适当的流体组合实验证明了可能的几何形状，并用定量的理论描述说明了这些几何形状。尽管这样的系统大体上是由相对界面能控制的，但细微之处，如范德华力和微重力的影响，尽管液滴的大小远低于毛细长度，在决定达到的平衡状态方面起着重要作用。实验测量了一种复合无柄液滴的干燥过程，揭示了复合无柄液滴不同特征构型之间的一种新的转变过程。这种液滴可能被证明是在软光学、光子学和表面封装等应用中开发功能表面的第一步。
Compound drops arise from the contact of three immiscible fluids and can assume various geometric forms based on the interfacial chemistry of the phases involved. Here we present a study of a new class of compound drops that is sessile on a solid surface. The possible geometries are demonstrated experimentally with appropriate fluid combinations and accounted for with a quantitative theoretical description. Although such systems are broadly controlled by relative interfacial energies, subtleties such as the van der Waals force and effects of micro-gravity, despite drop sizes being well below the capillary length, come into play in determining the equilibrium state that is achieved. The drying of a compound sessile drop was measured experimentally, and the process revealed a novel transition between different characteristic configurations of compound sessile drops. Such drops may prove to be useful as the first step towards development of functional surfaces in applications such as soft optics, photonics and surface encapsulation.