Mechanochromic Responses of Cholesteric Liquid Crystal Droplets with Nanoscale Periodic Helical Structures Showing Reversible and Tunable Structural Color,ACS Applied Polymer Materials

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Mechanochromic Responses of Cholesteric Liquid Crystal Droplets with Nanoscale Periodic Helical Structures Showing Reversible and Tunable Structural Color
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-12-30 , DOI: 10.1021/acsapm.1c01362
Chenjing Yang _{1,

2} , Baiheng Wu _{1,

2} , Jian Ruan ₁ , Peng Zhao ₁ , Jianzhen Shan ₁ , Rui Zhang ₃ , Dong Ki Yoon ₄ , Dong Chen _{1,

2,

5} , Kai Liu ₆

Affiliation

Cholesteric liquid crystal (CLC) droplets with nanoscale periodic helical structures are omnidirectional under planar anchoring, and light is selectively reflected from the droplet center at all directions. However, when CLC droplets are too small, random light scattering dominates. In this regard, we present a facile method to increase the selective Bragg reflection of CLC droplets and demonstrate the unique mechanochromic responses of CLC-droplet-dispersed polymer films. The films are originally opaque and white, when the films are bidirectionally stretched, spherical CLC droplets are squeezed into oblate shape and the point defect at the center of each CLC droplet transitions to a ring defect, greatly increasing the selective Bragg reflection region and resulting in the appearance of structural color. By tuning the helical pitches via the chiral dopant concentration from 1.7 to 3.0 wt %, the desired structural color is achieved. Smart sensors show color changes in response to hydration and dehydration are designed, paving the way for the developments of CLC-based functional materials and smart devices.

中文翻译：

具有显示可逆和可调结构颜色的纳米级周期性螺旋结构的胆甾型液晶液滴的机械变色响应

具有纳米级周期性螺旋结构的胆甾型液晶（CLC）液滴在平面锚定下是全向的，光从液滴中心选择性地向各个方向反射。然而，当 CLC 液滴太小时，随机光散射占主导地位。在这方面，我们提出了一种简单的方法来增加 CLC 液滴的选择性布拉格反射，并展示 CLC 液滴分散聚合物薄膜的独特机械变色响应。薄膜原本是不透明的白色，当薄膜被双向拉伸时，球形CLC液滴被挤压成扁圆形，每个CLC液滴中心的点缺陷转变为环形缺陷，大大增加了选择性布拉格反射区，导致结构颜色的外观。通过手性掺杂剂浓度从 1.7 到 3.0 wt% 调整螺旋间距，可以实现所需的结构颜色。智能传感器显示响应水合和脱水的颜色变化，为基于 CLC 的功能材料和智能设备的开发铺平了道路。

更新日期：2022-01-14

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