| 초록 |
Asymmetric features havereceived much attention for applications such as gecko-like dry adhesives, micro fluidic systems and so forth. We have fabricated polymer-based Janus structures by nano- and micro-moldings of a photo-curable polymercombined withoblique metal deposition on the polymeric structures. With the Janus nanopillars, wewere able torealize adhesion hysteresis, as can be seen from gecko feet.It shows the strong shear attachment when pulling from the direction of polymer contactsand relatively weak attachment in the opposite direction even with straight-up nanopillars. Since bent nanopillars haveshown the excellent adhesion hysteresis, we bent the Janus nanopillars bydifferentmechanisms. We obtained the bentnanopillars bytaking advantage of the difference in thermal expansion coefficients between polymer pillars and metal films,as well as the residual stress during the metal deposition. In addition, by changing parameters such as oblique angle, curing time and metal thickness, wewere able to control the bending angle of thenanopillars. |
