Cui Yiwen, Wang Yu, Wu Jie, He Xiaokang, Xuan Shouhu, Gong Xinglong
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China Hefei Anhui 230027 China
RSC Adv. 2019 Jun 7;9(31):17959-17966. doi: 10.1039/c9ra02892g. eCollection 2019 Jun 4.
This work demonstrates a simple microfluidic device to synthesize a magneto-thermochromic sphere with Janus inner structure. The Janus sphere is composed of FeO microspheres, thermochromic particles, and polyacrylamide matrix. Because the FeO microspheres are assembled together in one pole, the Janus sphere can turn around by varying the direction of the external magnetic field. Originating from the temperature-dependent property of the thermochromic particles, the final Janus sphere can change its color from red to pale blue when the temperature is increased from 5 to 45 °C. The detailed formation process and the magneto-thermochromic mechanism are carefully investigated. Due to the magnetic switch and thermochromism, these Janus spheres can be applied as colorful displays by controlling the magnetic field and temperature. The results demonstrate that the dual responsive Janus spheres possess broad application potential in temperature sensors and displays.
这项工作展示了一种简单的微流控装置，用于合成具有双面内结构的磁热致变色球体。该双面球体由FeO微球、热致变色颗粒和聚丙烯酰胺基质组成。由于FeO微球在一极聚集在一起，双面球体可以通过改变外部磁场方向而转动。基于热致变色颗粒的温度依赖性特性，当温度从5℃升高到45℃时，最终的双面球体可以从红色变为浅蓝色。详细研究了其形成过程和磁热致变色机制。由于磁开关和热致变色特性，通过控制磁场和温度，这些双面球体可应用于彩色显示。结果表明，这种双响应双面球体在温度传感器和显示器方面具有广阔的应用潜力。
