Regulating surface wrinkles using light

Liangwei Zhou; Kaiming Hu; Wenming Zhang; Guang Meng; Jie Yin; Xuesong Jiang

doi:10.1093/nsr/nwaa052

Regulating surface wrinkles using light

Natl Sci Rev. 2020 Jul;7(7):1247-1257. doi: 10.1093/nsr/nwaa052. Epub 2020 Mar 28.

Authors

Liangwei Zhou¹, Kaiming Hu², Wenming Zhang², Guang Meng², Jie Yin¹, Xuesong Jiang¹

Affiliations

¹ School of Chemistry & Chemical Engineering, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, China.
² State Key Laboratory of Mechanical Systems and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Abstract

Regulating existing micro and nano wrinkle structures into desired configurations is urgently necessary yet remains challenging, especially modulating wrinkle direction and location on demand. In this work, we propose a novel light-controlled strategy for surface wrinkles, which can dynamically and precisely regulate all basic characteristics of wrinkles, including wavelength, amplitude, direction and location (λ, A, θ and L_c ), and arbitrarily tune wrinkle topographies in two dimensions (2D). By considering the bidirectional Poisson's effect and soft boundary conditions, a modified theoretical model depicting the relation between stress distributions and the basic characteristics was developed to reveal the mechanical mechanism of the regulation strategy. Furthermore, the resulting 2D ordered wrinkles can be used as a dynamic optical grating and a smart template to reversibly regulate the morphology of various functional materials. This study will pave the way for wrinkle regulation and guide fabrication technology for functional wrinkled surfaces.

Keywords: dynamic light diffraction; ordered wrinkles; photodimerization; reversible buckling; surface patterns.