表面活性剂溶液界面拉压驱动液滴浸润性响应

液体表面的流体铺展在许多工程领域中具有广泛的应用前景。本文提出通过挡板对底液表面的拉压实现液滴的动态浸润响应，以正十六烷为受驱动液滴、十二烷基硫酸钠溶液为基底溶液组成浸润实验体系。挡板向外拉伸时，表面活性剂分子面密度降低，铺展系数增大，液滴铺展；挡板向内挤压时，表面活性剂分子面密度增大，铺展系数减小，液滴收缩。挡板往复运动实现了液滴的浸润性响应调控，这一工作为实现界面液膜的调节提供了新的思路。

RESPONSE OF THE DROPLET WETTABILITY DRIVEN BY INTERFACIAL TENSION OF SURFACTANT SOLUTION

Fluid spreading on liquid surfaces has a wide range of applications in many engineering fields. In this paper, it is proposed that the dynamic wetting response of droplets can be realized by the pulling and pressing of the baffle on the surface of the substrate. The infiltration experimental system was composed of n-hexadecane as the driven droplet and sodium dodecyl sulfate solution as the base solution. When the baffle is stretched outward, the molecular areal density of the surfactant decreases, the spreading coefficient increases, and the droplets spread. When the baffle is squeezed inward, the molecular areal density of the surfactant increases, the spreading coefficient decreases, and the droplets shrink. The reciprocating motion of the baffle realizes the wettability response regulation of the droplet, which provides a new idea for the adjustment of the interface liquid film.