Crack-Free, Soft Wrinkles Enable Switchable Anisotropic Wetting
Crack-Free, Soft Wrinkles Enable Switchable Anisotropic Wetting
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DOI：
10.1002/anie.201701968
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发表时间：
2017-06-01
影响因子：
16.6
通讯作者：
Odom, Teri W.
中科院分区：
文献类型：
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作者：
Rhee, Dongjoon;Lee, Won-Kyu;Odom, Teri W.
弹性基板上的柔软皮肤层被证明支持机械响应的皱纹模式，在施加应变下不会表现出开裂。预应变聚二甲基硅氧烷板上的软含氟聚合物蒙皮层在高应变状态下实现了无裂纹表面起皱，这是使用传统硬蒙皮层所不可能实现的。经过多次拉伸和释放循环后，软皮层和硬皮层之间的并排比较表明，软皮层能够动态控制皱纹地形，而不会出现裂缝或分层。我们系统地表征了褶皱波长、振幅和取向随拉伸应变的演变，以解决无裂纹结构转变。我们证明了褶皱表面可以引导水沿着褶皱方向扩散，从而实现了可切换的各向异性润湿。
Soft skin layers on elastomeric substrates are demonstrated to support mechano-responsive wrinkle patterns that do not exhibit cracking under applied strain. Soft fluoropolymer skin layers on pre-strained poly(dimethylsiloxane) slabs achieved crack-free surface wrinkling at high strain regimes not possible by using conventional stiff skin layers. A side-by-side comparison between the soft and hard skin layers after multiple cycles of stretching and releasing revealed that the soft skin layer enabled dynamic control over wrinkle topography without cracks or delamination. We systematically characterized the evolution of wrinkle wavelength, amplitude, and orientation as a function of tensile strain to resolve the crack-free structural transformation. We demonstrated that wrinkled surfaces can guide water spreading along wrinkle orientation, and hence switchable, anisotropic wetting was realized.