Highly organized hierarchical surface morphologies possess various intriguing properties that could find important potential applications. In this paper, we demonstrate a facile approach to simultaneously form multiscale hierarchical surface morphologies through sequential wrinkling. This method combines surface wrinkling induced by thermal expansion and mechanical strain on a three-layer structure composed of an aluminum film, a hard Polydimethylsiloxane (PDMS) film, and a soft PDMS substrate. Deposition of the aluminum film on hard PDMS induces biaxial wrinkling due to thermal expansion mismatch, and recovering the prestrain in the soft PDMS substrate leads to wrinkling of the hard PDMS film. In total, three orders of wrinkling patterns form in this process, with wavelength and amplitude spanning 3 orders of magnitude in length scale. By increasing the prestrain in the soft PDMS substrate, a hierarchical wrinkling-folding structure was also obtained. This approach can be easily extended to other thin fi...

中文翻译：

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通过顺序起皱和折叠同时形成多尺度分层表面形态

高度组织的分层表面形态具有各种有趣的特性，可以找到重要的潜在应用。在本文中，我们展示了一种通过顺序起皱同时形成多尺度分层表面形态的简便方法。该方法将热膨胀和机械应变引起的表面起皱结合在由铝膜、硬聚二甲基硅氧烷 (PDMS) 膜和软 PDMS 基板组成的三层结构上。由于热膨胀不匹配，在硬质 PDMS 上沉积铝膜会引起双轴起皱，恢复软质 PDMS 基材中的预应变会导致硬质 PDMS 膜起皱。总的来说，在这个过程中形成了三个数量级的皱纹模式，波长和幅度在长度尺度上跨越了 3 个数量级。通过增加软质 PDMS 基材中的预应变，还获得了分层起皱折叠结构。这种方法可以很容易地扩展到其他薄...