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Microfluidic-directed magnetic controlling supraballs with multi-responsive anisotropic photonic crystal structures

Lu-Wei Hao  Ji-Dong Liu  Qing Li  Ren-Kun Qing  Yun-Ya He  Jiazhuang Guo  Ge Li  Liangliang Zhu  Chen Xu  Su Chen  
【摘要】:The design and fabrication of anisotropic photonic crystal supraballs with multiple responses are highly desirable for versatile environmental sensing and flexible displaying.Herein,we developed an available strategy to construct a series of multi-responsive magnetic colloidal photonic crystal(CPC) supraballs with Janus and molecular-analogue structures.Initially,the humidity and temperature sensitive CPC supraballs were obtained via immobilization of polyacrylamide(PAM) and polyisopropylacrylamide(PNIPAM) hydrogels into the CPC structure,respectively,and Cd Te/Zn S quantum dots endow the supraballs fluorescent signal under UV light.Furthermore,Fe_3O_4 nanoparticles(NPs) were served as a magnetic hemisphere to construct CPC Janus supraballs which can be subsequently assembled into three different molecular-shaped cluster particles that integrate more response types via Fe_3O_4 NPs hemisphere coalescence to a magnetic coupling center,recognizing multiple responses simultaneously that correspond the environmental altering.In addition,2 D polychromatic patterns with sensitive CPC pixels printed by automatic printing system were demonstrated,which could monitor the changes of temperature and humidity.The multi-responsive magnetic controlling supraballs and 2D patterns reveal the promising applications in environmental sensing,anti-counterfeiting and displaying.

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