| 초록 |
Superhydrophobic surfaces are usually similar to that of the lotus leaf and have characteristics of a large water contact angle (WCA) and a small sliding angle (SA). The other superhydrophobic surface is the one with high adhesion to water. Highly adhesive surfaces show both high water contact angle and large contact angle hysteresis. Herein, we report a superhydrophobic nanostructured material with two different states (i.e. lotus and gecko state) via holographic lithography and following CF4 dry etching. The normal nanostructure showed lotus type superhydrophobic surface with 160 ° WCA and 3 ° SA. However 3D nanostructure with line defect was generated when the incoming laser beam was slightly tilted. In this case, the structure represented gecko type superhydrophobic suface with 157.2° WCA. A water droplet placed on the nanostructrued material does not slide, even when the surfaces is tilted vertically or turned upside down. |
