Bar-coating programmable mechanochromic bilayer PDMS film with angle-dependent and angle-independent structural colors
Bar-coating programmable mechanochromic bilayer PDMS film with angle-dependent and angle-independent structural colors
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DOI：
10.1016/j.dyepig.2021.109264
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发表时间：
2021-03-06
影响因子：
4.5
通讯作者：
Tang, Bingtao
中科院分区：
文献类型：
--
作者：
Qi, Yong;Zhou, Changtong;Tang, Bingtao
机械变色和非变色材料在过去几年中在防伪、传感和包装方面得到了广泛的关注和大力发展。然而，具有角度相关和非角度结构颜色的机械响应材料的制造仍然是一个挑战。采用自底向上棒状涂膜的方法制备了具有角度依赖和角度无关结构色的大面积机械致变色双层聚二甲基硅氧烷（PDMS）薄膜。远距离无序和短程有序聚苯乙烯（PS）纳米阵列使双层膜具有不依赖于角度的结构颜色。同时，拉伸引起的表面起皱会产生与角度相关的结构颜色。此外，由于拉伸引起的PS纳米阵列裂纹和表面褶皱增加了双层膜的散射效果，降低了光的透过率。重要的是，压力诱导的表面结构重排可以消除起皱行为。压力编码的不可见复杂信息可以通过拉伸可逆地显示。在复杂信息编码、显示、智能窗口等方面具有潜在的应用价值。
Mechanical discoloration and non-discoloration materials have received intensive interest and have been strongly developed over the past few years for anti-counterfeiting, sensing, and packaging. However, the fabrication of mechanical response materials with both angle-dependent and angle-independent structural colors remains challenges. Large-area mechanochromic bilayer polydimethylsiloxane (PDMS) film with both angledependent and angle-independent structural colors have been prepared by using bottom-up bar-coating. The long-range disordered and short-range ordered polystyrene (PS) nanoarrays give the bilayer film angleindependent structural color. Meanwhile, the surface wrinkling triggered by stretching generates angledependent structural color. Moreover, PS nanoarray cracks and surface wrinkles caused by tensile increase the scattering effect of the bilayer film and decrease the transmittance of the light. Importantly, pressure-induced surface structure rearrangements can deprive wrinkling behavior. The pressure-encoded invisible complex information can be displayed reversibly by stretching. It has potential application value in complex information coding, display, and smart window.