| 초록 |
We present a simple yet robust method for fabricating angled, hierarchically patterned high aspect-ratio polymer nanohairs to generate directionally sensitive dry adhesives. As a result of controlled leaning angle and bulged flat top of the nanohairs, the replicated, slanted nanohairs showed excellent directional adhesion, exhibiting strong shear attachment (~21 N/cm2 in average and ~26 N/cm2 in maximum) in the angled direction and easy detachment (~2.2 N/cm2) in the opposite direction, with a hysteresis value of ~10. In addition, monolithic, hierarchical hairs maintained their adhesive force even on a rough surface (roughness ＜ 20 m) due to an increase in the contact area by the enhanced height of hierarchy, whereas simple nanohairs lost their adhesion strength. To demonstrate the potential applications of the adhesive patch, the dry adhesive was used to transport a large area glass, which could replace the current electrostatic transport/holding system with further optimization. |
