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Tuning and Erasing Surface Wrinkles by Reversible Visible‐Light‐Induced Photoisomerization
Author(s) -
Zong Chuanyong,
Zhao Yan,
Ji Haipeng,
Han Xue,
Xie Jixun,
Wang Juanjuan,
Cao Yanping,
Jiang Shichun,
Lu Conghua
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201510796
Subject(s) - photoisomerization , erasure , azobenzene , materials science , wrinkle , braid , stress (linguistics) , optics , nanotechnology , computer science , chemistry , physics , polymer , isomerization , composite material , biochemistry , linguistics , philosophy , programming language , catalysis
Periodic wrinkling across different scales has received considerable attention because it not only represents structure failure but also finds wide applications. How to prevent wrinkling or create desired wrinkling patterns is non‐trivial because the dynamic evolution of wrinkles is a highly nonlinear problem. Herein, we report a simple yet powerful method to dynamically tune and/or erase wrinkling patterns with visible light. The light‐induced photoisomerization of azobenzene units in azopolymer films leads to stress release and consequently to the erasure of the wrinkles. The wrinkles in unexposed regions are also affected and oriented perpendicular to the exposed boundary during the stress reorganization. Theoretical models were developed to understand the dynamics of the reversible photoisomerization‐induced wrinkle evolution. This method can be applied for designing functional materials/devices, for example, for the reversible optical writing/erasure of information as demonstrated here.