Abstract

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.

中文翻译：

---

PDMS膜的厚度依赖性皱纹可实现可编程的机械变色响应

摘要

我们报告了氧等离子体处理的聚二甲基硅氧烷（PDMS）膜的显着厚度依赖性起皱行为，其中能垒将起皱机理分为两个机制。对于厚膜，膜会以恒定的周期性起皱，这可以通过经典的非线性有限机制精确地预测。将膜厚度减小到1 mm以下会导致不均匀的褶皱，并增加周期性，这会导致在机械应变下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，并进一步设计了具有出色结构颜色和可编程色度响应的机械变色设备。