Micro machining for control of wettability with surface topography

作者：Matsumura Takashi^*; Iida Fumio; Hirose Takuya; Yoshino Masahiko

来源：Journal of Materials Processing Technology, 2012, 212(12): 2669-2677.

DOI：10.1016/j.jmatprotec.2012.05.021

• Micro machining, FIB, Stamping, Plastic
• molding, Functional surface, Hydrophobicity, Contact angle

A micro fabrication is presented to manufacture hydrophobic surfaces with micro-scale structures. Hydrophobicity is controlled with the shape and the alignment of micro pillars in the structure. The structures are manufactured in large areas at high production rates in the following processes: (1) the structure is fabricated on a tool by focused ion beam sputtering: (2) the reverse structure is formed on a metal plate by incremental stamping using the structured tool; and (3) the structure is transferred onto plastic plates by molding. A consecutive stamping is also proposed to fabricate several structures on a surface accurately with a structured tool, in which the moving pitch of the structured tool is numerically controlled. The effect of the surface topography on hydrophobicity is discussed with measuring contact angles on the structured surfaces in the water droplet tests. Hydrophobicity on the plastic plate is associated with the solid fraction on the structured surface based on the Cassie-Baxter model. A larger contact angle is observed for a smaller solid fraction of the surface.

• 出版日期2012-12