| 초록 |
Instability of a thin film attached to a compliant substrate often leads to emergence of exquisite wrinkle patterns with length scales that depend on the system geometry and applied stresses. In this talk, a general overview of surface nanopatterns on various polymeric materials and its applications will be first introduced based on present works. Then, we discuss two features of wrinkles created using ion beam treatment/deposition with glancing angle. This talk presents a method to create a tilted polymeric micropillar by ion beam irradiation with glancing angle. The method combines soft lithography to create straight micropillars and ion beam irradiation to tilt the straight micropillars in a controlled fashion, which mimics the geometry of gecko’s footpad. Secondly we also presents a porous carbon film deposited with a glazing angle deposition using ion beam system. The wrinkle patterns that are created using the current techniques in polymer surfaces, generally have low aspect ratio of undulation amplitude to wavelength, thus, limiting their application. This method enables us to create wrinkles with a desired wavelength and high aspect ratio of amplitude over wavelength as large as to 2.5:1. Using this method, pattern amplitudes of several nm to submicron size can be achieved by varying the carbon deposition time, allowing us to harness patterned polymers substrates for variety of application. |
