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Dual Light and Temperature Responsive Micrometer-Sized Structural Color Actuators.
Small ( IF 13.0 ) Pub Date : 2019-12-03 , DOI: 10.1002/smll.201905219 Alberto Belmonte 1, 2 , Yera Ye Ussembayev 3 , Tom Bus 1, 2 , Inge Nys 3 , Kristiaan Neyts 3 , Albertus P H J Schenning 1, 2, 4
Small ( IF 13.0 ) Pub Date : 2019-12-03 , DOI: 10.1002/smll.201905219 Alberto Belmonte 1, 2 , Yera Ye Ussembayev 3 , Tom Bus 1, 2 , Inge Nys 3 , Kristiaan Neyts 3 , Albertus P H J Schenning 1, 2, 4
Affiliation
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Externally induced color- and shape-changes in micrometer-sized objects are of great interest in novel application fields such as optofluidics and microrobotics. In this work, light and temperature responsive micrometer-sized structural color actuators based on cholesteric liquid-crystalline (CLC) polymer particles are presented. The particles are synthesized by suspension polymerization using a reactive CLC monomer mixture having a light responsive azobenzene dye. The particles exhibit anisotropic spot-like and arc-like reflective colored domains ranging from red to blue. Electron microscopy reveals a multidirectional asymmetric arrangement of the cholesteric layers in the particles and numerical simulations elucidate the anisotropic optical properties. Upon light exposure, the particles show reversible asymmetric shape deformations combined with structural color changes. When the temperature is increased above the liquid crystal-isotropic phase transition temperature of the particles, the deformation is followed by a reduction or disappearance of the reflection. Such dual light and temperature responsive structural color actuators are interesting for a variety of micrometer-sized devices.
中文翻译：
双重光和温度响应千分尺大小的结构色彩执行器。
在微米级物体中，外部引起的颜色和形状变化在诸如光流体学和微型机器人学的新型应用领域中引起了极大的兴趣。在这项工作中，提出了基于胆甾型液晶（CLC）聚合物颗粒的光响应和温度响应的微米级结构颜色致动器。通过使用具有光响应性偶氮苯染料的反应性CLC单体混合物通过悬浮聚合来合成颗粒。粒子显示出各向异性的斑点状和弧状反射色域，范围从红色到蓝色。电子显微镜揭示了颗粒中胆甾醇层的多向不对称排列，并且数值模拟阐明了各向异性的光学性质。曝光后 颗粒显示出可逆的不对称形状变形，并伴有结构颜色变化。当温度升高到颗粒的液晶各向同性相变温度以上时，变形之后反射减少或消失。这种对光和温度敏感的双色结构致动器对于各种微米尺寸的设备都是令人感兴趣的。
更新日期：2020-01-09
中文翻译：
双重光和温度响应千分尺大小的结构色彩执行器。
在微米级物体中，外部引起的颜色和形状变化在诸如光流体学和微型机器人学的新型应用领域中引起了极大的兴趣。在这项工作中，提出了基于胆甾型液晶（CLC）聚合物颗粒的光响应和温度响应的微米级结构颜色致动器。通过使用具有光响应性偶氮苯染料的反应性CLC单体混合物通过悬浮聚合来合成颗粒。粒子显示出各向异性的斑点状和弧状反射色域，范围从红色到蓝色。电子显微镜揭示了颗粒中胆甾醇层的多向不对称排列，并且数值模拟阐明了各向异性的光学性质。曝光后 颗粒显示出可逆的不对称形状变形，并伴有结构颜色变化。当温度升高到颗粒的液晶各向同性相变温度以上时，变形之后反射减少或消失。这种对光和温度敏感的双色结构致动器对于各种微米尺寸的设备都是令人感兴趣的。
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