Tunable Structural Color with Gradient and Multiaxial Polydimethylsiloxane Wrinkling
Tunable Structural Color with Gradient and Multiaxial Polydimethylsiloxane Wrinkling
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DOI：
10.1002/adom.202200964
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发表时间：
2022-06
影响因子：
9
通讯作者：
Annabelle Tan;L. Pellegrino;Zain Ahmad;J. Cabral
中科院分区：
文献类型：
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作者：
Annabelle Tan;L. Pellegrino;Zain Ahmad;J. Cabral
研究了聚二甲基硅氧烷(PDMS)表面在单轴应变场、多轴应变场和顺序应变场作用下产生的结构色。这种方法是基于众所周知的，机械诱导的，屈曲不稳定性的支撑双层，由此顶层玻璃“皮肤”是由等离子体氧化形成的。根据观测到的颜色、强度光谱和不同级数的混色，研究了包含可见光谱的2 0 0 nm≲d≲3μm的表面周期，结果与模型预测吻合较好。与复杂的制备方法相比，通过调整等离子体和应变参数以及动态变化应变(ε≲50%)，可以很容易地实现颜色可调性和机械变色响应。规定的应变方向性，使用单轴、各向同性、梯度应变和波和褶皱叠加，以及皮肤厚度(从而d)和幅度梯度，使用简单和可扩展的制造方法，产生惊人的空间颜色变化、均质性和方向性。
The generation of structural color from wrinkled polydimethylsiloxane (PDMS) surfaces, fabricated by plasma exposure, subjected to uni‐ and multi‐axial, and sequential strain fields is examined. The approach is based on the well‐known, mechanically‐induced, buckling instability of a supported bilayer, whereby the top glassy “skin” is formed by plasma oxidation. Surface periodicities 200 nm ≲ d ≲ 3 μm, encompassing the visible spectrum, are investigated in terms of the observed color, intensity spectrum, and color mixing from different diffraction orders, exhibiting good agreement with model predictions. By contrast with complex fabrication methods, color tunability and mechanochromic response are readily achieved by adjusting plasma and strain parameters, and by dynamically varying strain (ε ≲ 50%). Prescribed strain directionality, employing uniaxial, isotropic, gradient strain, and wave‐sum wrinkling superposition, as well as skin thickness (and thus d) and amplitude gradients, using facile and scalable fabrication approaches, yield striking spatial color variation, homogeneity, and directionality.