SCNU-TUE Joint Lab of Device Integrated Responsive Materials, National Center for International Research on Green Optoelectronics, South China Normal University , Guangzhou 510006 , People's Republic of China.
Stimuli-Responsive Functional Materials and Devices, Chemical Engineering and Chemistry , Eindhoven University of Technology , 5600 MB Eindhoven , The Netherlands.
Langmuir. 2018 Sep 11;34(36):10543-10549. doi: 10.1021/acs.langmuir.8b01934. Epub 2018 Aug 28.
Wrinkling is a powerful technique for the preparation of surface structures over large areas, but it is difficult to simultaneously control the direction, period, and amplitude of the wrinkles without resorting to complicated procedures. In this work, we demonstrate a wrinkling system consisting of a liquid crystal polymer network and a thin layer of gold, in which the direction of the wrinkles is controlled by the alignment of the liquid crystal molecules and the average amplitude and period are controlled by a high-intensity UV irradiation. The UV exposure represses the amplitude and period dictated by the total exposure. Using photoalignment and photomasks, we demonstrate an unprecedented control over the wrinkling parameters and were able to generate some striking optical patterns. The mechanism of the wrinkle suppression was investigated and appears to involve localized photodegradation at the polymer-gold interface, possibly due to the formation of mechanoradicals.
起皱是一种在大面积上制备表面结构的强大技术，但如果不采用复杂的程序，很难同时控制皱纹的方向、周期和幅度。在这项工作中，我们展示了一个由液晶聚合物网络和一层薄金组成的起皱系统，其中皱纹的方向由液晶分子的取向控制，平均幅度和周期由高强度 UV 照射控制。UV 暴露抑制了由总暴露决定的幅度和周期。使用光取向和光掩模，我们对起皱参数进行了前所未有的控制，并能够产生一些引人注目的光学图案。研究了抑制皱纹的机制，该机制似乎涉及聚合物-金界面的局部光降解，可能是由于机械自由基的形成。
