Thickness-dependent wrinkling of PDMS films for programmable mechanochromic responses
Thickness-dependent wrinkling of PDMS films for programmable mechanochromic responses
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DOI：
10.1007/s12274-020-2617-z
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发表时间：
2020-07-01
期刊：
影响因子：
9.9
通讯作者：
Yin, Yadong
中科院分区：
文献类型：
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作者：
Li, Zhiwei;Liu, Yun;Yin, Yadong
我们报道了氧等离子体处理的聚二甲基硅氧烷(PDMS)薄膜显著的厚度相关起皱行为，其中的一个能垒将起皱机理分为两个区域。对于厚膜，膜起皱具有一个恒定的周期，这可以用经典的非线性有限力学精确地预测。将薄膜厚度减小到1 mm以下，会产生不均匀的皱纹，且周期性增加，从而导致机械应变下的随机散射和透明度变化。通过调节薄膜厚度，我们能够控制周期性皱纹的质量和大小，并进一步设计出具有鲜明结构颜色和可编程色度响应的机械变色装置。这项工作有助于从根本上理解双层体系的褶皱机制及其有趣的机械变色应用。
We report a remarkable thickness-dependent wrinkling behavior of oxygen plasma-treated polydimethylsiloxane (PDMS) films, in which an energy barrier separates the wrinkling mechanics into two regimes. For thick films, the film wrinkles with a constant periodicity which can be precisely predicted by the classic nonlinear finite mechanics. Reducing the film thickness below 1 mm leads to nonuniform wrinkles with an increasing periodicity which gives rise to random scattering and transparency changes under mechanical strains. By tuning the film thickness, we were able to control both the quality and size of the periodic wrinkles and further design mechanochromic devices featuring brilliant structural colors and programmable colorimetric responses. This work sheds light on the fundamental understanding of the wrinkling mechanics of bilayer systems and their intriguing mechanochromic applications.