图案化基底上液滴的挥发行为

采用液滴形状分析仪, 在线跟踪了液滴在图案化基底上的挥发过程. 结果表明, 与平滑基底结果相比, 图案化基底上的挥发过程明显不同. 首先, 接触角减小; 另外, 由于发生了Cassie态到Wenzel态转变, 所得接触直径在减小过程中产生了一个突然变大的阶段. 在该挥发过程中, 突起部分的面积分数扮演了十分重要的角色.

Investigation of Evaporation of Droplet on Patterned Substrate

Using drop shape analysis, evaporation of water droplet on patterned substrate were investigated. The results show that evolutions of contact angle and contact diameter depend crucially on the solid fraction in contact with the liquid. With decreasing this fraction, static contact angle of this system increased linearly while a jump in the contact diameter, which was caused by the transition from Cassie state to Wenzel state, appeared and became more and more remarkably. The results will not only help to understand the basic physical mechanism of evaporation, but also serve as important starting point of considering Cassie, Wenzel state and transition between them.