The Energy Transition on Superhydrophobic Surface by Electrowetting Control
Transition between Wenzel and Cassie states on superhydrophobic surface has attracted substantial interest from various research communities. The transition between the two states is realized by the methods of changing surface structure in micron scale, or changing the surface tension between a droplet and a solid surface through external electric field, temperature, light, etc. In this paper we design a rough surface on aluminum substrate with the etching processes, on which a large superhydrophobic surface is achieved easily and economically. On this surface, a drop of saline solution water forms a nearly perfect spherical pearl with the apparent contact angle over than 160°. By applying external voltage between the substrate and the solution, we observe a different electrowetting phenomenon from the case on other superhydrophobic surfaces, i.e. on silicon nanowires coated with hydrophobic fluoropolymer C4F8. This difference is discussed and explained by asymmetry of the superhydrophobic surface which increases the hysteresis. A saturated apparent contact angle is also observed as the applied voltage increased to a specific value.
Superhydrophobic Electrowetting Wenzel state Cassie state
Jun Wu Jun Xia Bao-ping Wang
Display Center, School of Electronic Science and Engineering, Southeast University, nanjing 210096, China
国际会议
青岛
英文
91-94
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）