| 학회 |
한국화학공학회 |
| 학술대회 |
2009년 가을 (10/22 ~ 10/23, 일산 KINTEX) |
| 권호 |
15권 2호, p.2121 |
| 발표분야 |
재료 |
| 제목 |
Fabrication of Bent Janus Nanopillars and Their Applications to Gecko-like Dry Adhesives |
| 초록 |
We present a fabrication method to realize Janus nanopillars revealing the direction-dependent dry adhesive behavior. Polymeric nanopillars were first molded from an etched SiO2 substrate with high aspect ratio nanoholes, followed by the oblique metal deposition on polymer nanopillars such that metal layers in different thickness were coated only on one side of the pillars. The Janus nanopillars could be bent during deposition or by additional thermal annealing. The bending mechanism for the nanopillars toward the metal layer by thermal annealing can be explained by the mismatch in thermal expansion coefficient between metal and polymer, followed by the plastic deformation of polymeric pillars. What is strikingly interesting is that these bent Janus nanopillars show even more pronounced adhesion hysteresis: strong shear attachment when pulled from the bent direction in contrast to easy detachment from the opposite direction just like Gecko-like adhesives. We also demonstrate that this type of bending process for Janus nanopillars has a definite advantage for the large area fabrication. |
| 저자 |
윤현식, 서갑양, 차국헌
|
| 소속 |
서울대 |
| 키워드 |
Gecko; dry adhesive; Janus; Nanopillar; oblique deposition
|
| E-Mail |
|
| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
