Reconfiguring Colors of Single Relief Structures by Directional Stretching
Reconfiguring Colors of Single Relief Structures by Directional Stretching
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DOI：
10.1002/adma.202108128
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发表时间：
2021-11
影响因子：
29.4
通讯作者：
Qifeng Ruan;Wang Zhang;Hao Wang;John You En Chan;Hongtao Wang;Hailong Liu;Dianyuan Fan;Ying Li;C. Qiu;Joel K. W. Yang
中科院分区：
文献类型：
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作者：
Qifeng Ruan;Wang Zhang;Hao Wang;John You En Chan;Hongtao Wang;Hailong Liu;Dianyuan Fan;Ying Li;C. Qiu;Joel K. W. Yang
颜色的变化可以通过拉伸光子晶体或嵌入可拉伸材料中的光栅来实现。然而，多个重复单元和对纳米结构的体积组装的需要限制了信息内容的密度。受甲骨文和音乐记录上的表面浮雕作为信息存档手段的启发，表面浮雕弹性体被赋予了多组信息，这些信息可以通过沿沿着面内轴的机械应变来访问。与周期性结构的布拉格衍射效应不同，沟槽由于沟槽深度的变化而产生颜色，使各个沟槽段能够支持单一颜色。使用3D打印的长方体，在弹性体中复制不同几何参数的沟槽。这些参数确定初始颜色（或其缺乏）、对毛细力的响应以及当沿沿着或跨沟槽应变时的外观。应变引起沟槽深度或沟槽的打开和关闭的调制，导致具有多达六种不同状态的表面浮雕，以及当沿沿着不同轴拉伸时显示两个不同图像的初始无特征表面。高度可逆的结构色在光学数据存档、防伪和应变传感应用中很有前途。
Color changes can be achieved by straining photonic crystals or gratings embedded in stretchable materials. However, the multiple repeat units and the need for a volumetric assembly of nanostructures limit the density of information content. Inspired by surface reliefs on oracle bones and music records as a means of information archival, here, surface‐relief elastomers are endowed with multiple sets of information that are accessible by mechanical straining along in‐plane axes. Distinct from Bragg diffraction effects from periodic structures, trenches that generate color due to variations in trench depth, enabling individual trench segments to support a single color, are reported. Using 3D printed cuboids, trenches of varying geometric parameters are replicated in elastomers. These parameters determine the initial color (or lack thereof), the response to capillary forces, and the appearance when strained along or across the trenches. Strain induces modulation in trench depth or the opening and closure of a trench, resulting in surface reliefs with up to six distinct states, and an initially featureless surface that reveals two distinct images when stretched along different axes. The highly reversible structural colors are promising in optical data archival, anti‐counterfeiting, and strain‐sensing applications.