Selectively Patterning Polymer Opal Films via Microimprint Lithography.
Selectively Patterning Polymer Opal Films via Microimprint Lithography.
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DOI：
10.1002/adom.201400327
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发表时间：
2014-11
影响因子：
9
通讯作者：
Baumberg, Jeremy J.
中科院分区：
文献类型：
--
作者：
Ding, Tao;Zhao, Qibin;Smoukov, Stoyan K.;Baumberg, Jeremy J.
大规模的结构彩色柔性涂层一直难以制造，而在其上形成图案颜色是许多应用的关键，包括大面积应变传感器、墙壁大小的显示器、安全设备和智能织物。为了实现可控的调谐，这里应用了微印迹技术来图案化聚合物蛋白石膜(POF)的表面形态和结构颜色。这些POF是由嵌入在软壳中的硬质球形粒子的3D有序阵列组成的。柔软的外壳使POF在印有预先图案化的印记时变形，从而驱动软聚合物的流动和薄膜内硬球的重新排列。结果，在POF内产生图案化的表面形态，并且在不同区域内选择性地修改结构颜色。这些变化取决于压印的压力、温度和持续时间，以及邮票中的特征尺寸。此外，图案的几何形状和结构颜色可以通过拉伸进一步调整。印迹产生的微图案颜色依赖于剪切流动下聚合物基质中胶体传输的控制，并带来了许多潜在的性质，包括可拉伸和可调谐，以及基本的兴趣。
Large-scale structural color flexible coatings have been hard to create, and patterning color on them is key to many applications, including large-area strain sensors, wall-size displays, security devices, and smart fabrics. To achieve controlled tuning, a micro-imprinting technique is applied here to pattern both the surface morphology and the structural color of the polymer opal films (POFs). These POFs are made of 3D ordered arrays of hard spherical particles embedded inside soft shells. The soft outer shells cause the POFs to deform upon imprinting with a pre-patterned stamp, driving a flow of the soft polymer and a rearrangement of the hard spheres within the films. As a result, a patterned surface morphology is generated within the POFs and the structural colors are selectively modified within different regions. These changes are dependent on the pressure, temperature, and duration of imprinting, as well as the feature sizes in the stamps. Moreover, the pattern geometry and structural colors can then be further tuned by stretching. Micropattern color generation upon imprinting depends on control of colloidal transport in a polymer matrix under shear flow and brings many potential properties including stretchability and tunability, as well as being of fundamental interest.
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