Spherical-micelle-driven deposition of high-speed impacting water droplets on superhydrophobic surfaces
Spherical-micelle-driven deposition of high-speed impacting water droplets on superhydrophobic surfaces
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DOI：
10.1039/d2ta06767f
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发表时间：
2022-10-10
影响因子：
11.9
通讯作者：
Wang, Yilin
中科院分区：
文献类型：
--
作者：
Jiang, Yue;Wang, Meina;Wang, Yilin
控制高速冲击水滴在超疏水表面的沉积和扩散在许多应用中是至关重要的。调节自组装表面活性剂结构是一种有效的方法。然而，小的球形胶束作为一种更直接的封装系统，不能像以前报道的那样表现出这种性能。在这里，十二烷基硫酸钠（SDS）的一个小的球形胶束，经过支化有机阳离子（TAAB-n）的胶束表面修饰，使高速冲击的水滴完全沉积和扩散在超疏水表面。完整的沉积和扩散要求胶束与超疏水表面的微/纳米结构表现出更强的相互作用，更高的表面活性，更快速的分子扩散。否则，如果胶束表现出更快的分子扩散，但不能与新形成的撞击形成的液/固界面紧密相互作用，或者由于SDS和TAAB-n分子之间的疏水相互作用增强，胶束生长成大的球形聚集体，从而限制了分子在液/固界面的扩散和补充，则水滴会反弹或飞溅出超疏水表面。本研究为利用改性小球形胶束抑制高速冲击液滴在超疏水表面的反弹和飞溅开辟了一条途径。
Controlling the deposition and spread of high-speed impacting water droplets on superhydrophobic surfaces is crucial in numerous applications. Modulating self-assembled surfactant structures has been recently proved to be an efficient strategy. However, small spherical micelles, as a more straightforward encapsulation system, could not show this performance, as reported previously. Herein, a small spherical micelle of sodium dodecyl sulfate (SDS), upon micellar surface modification by branched organic cations (TAAB-n), enables high-speed impacting water droplets to completely deposit and spread on a superhydrophobic surface. The complete deposition and spread require that the micelles show stronger interaction with the micro/nanostructures of the superhydrophobic surface, higher surface activity, and more rapid molecular diffusion. Otherwise, the water droplets will rebound or splash off the superhydrophobic surface if the micelles exhibit faster molecular diffusion but cannot closely interact with the newly impact-created liquid/solid interface, or if the micelles grow into large spherical aggregates due to enhanced hydrophobic interaction among the SDS and TAAB-n molecules and thereby limit the molecular diffusion and replenishment to the liquid/solid interface. This work opens a way to utilize modified small spherical micelles to inhibit the rebound and splash of high-speed impacting droplets on superhydrophobic surfaces.