液滴在超疏水形状记忆微阵列表面上定向/非定向滚动的可逆调控

利用3D打印、 模板赋形和表面修饰的方法, 制备出具有竖直结构的超疏水形状记忆微阵列. 该微阵列的竖直状态和倾斜状态能够基于形状记忆效应进行可逆调控. 当微阵列的结构发生改变, 液滴在表面的滚动状态也随之发生变化. 液滴在竖直的微阵列上表现出非定向滚动特征, 即液滴向微阵列两侧运动的滚动角是一致的. 在倾斜的微阵列上, 液滴则表现出定向运动的功能, 即液滴沿着微阵列倾斜方向上的滚动角要小于逆着阵列倾斜方向的滚动角. 因此, 本文通过调控微阵列形态实现了对液滴定向/非定向滚动的可逆调控.

Reversible Regulation of Droplet Directional/anti-directional Rolling on Superhydrophobic Shape Memory Microarray Surface

Superhydrophobic shape memory microarray with upright structure was fabricated by 3D printing， template molding and surface modification. The upright and tilted structure of the microarray can be controlled reversibly based on the polymer’s shape memory ability. With the change of microarray structure， the rolling state of droplets on the microarray surface can also be changed. The droplet shows anti-directional transport on the upright microarray， that is， the rolling angle of droplet moving toward both sides of the array is consistent. However， on the tilted microarray， the droplet shows directional sliding， that is， the rolling angle of the droplet along the bending direction of the array is smaller than that against the bending direction of the microarray. Therefore， the microarray achieves reversible regulation of droplet directional/anti-directional rolling.