| 초록 |
Wetting property of a given surface is one of the most important properties that need to be engineered in various applications. In general, wetting property of a surface can be controlled either by tailored surface chemistry or roughness, or both. It may be desirable to get surface with switchable wetting property, that is, wettability conversion from hydrophobic to hydrophilic, or vice versa. Here we have demonstrated that the superhydrophilic (i.e., water contact angle of ＜ 10o)Si nanowire surface can easily be converted to superhydrophobic (contact angle of ＞90o) simply by contact-printing siloxane oligomers that is recovered from elastomeric polydimethylsiloxane (PDMS) stamp. Further, the printed siloxane oligomers can easily be removed by solvent washing, leading to the recovery of original superhydrophilic property. Compared to other techniques proposed in the literature for the wettability switching, such as pH, light, etc., the proposed approach is extremely simple and does not require any expensive materials or equipment. |
