J. Mater. Sci. Technol. ›› 2021, Vol. 81: 203-211.DOI: 10.1016/j.jmst.2020.11.063

• Research Article • Previous Articles     Next Articles

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

Lu-Wei Haoa, Ji-Dong Liua, Qing Lia, Ren-Kun Qinga, Yun-Ya Hea, Jiazhuang Guoa, Ge Lia, Liangliang Zhua,*(), Chen Xub,*(), Su Chena,*()   

  1. aState Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials, Nanjing Tech University, 5 Xin Mofan Road, Nanjing, 210009, China
    bState Key Laboratory of Pharmaceutical Biotechnology and School of Life Sciences, Nanjing University, Nanjing 210023, China

Abstract:

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 CdTe/ZnS quantum dots endow the supraballs fluorescent signal under UV light. Furthermore, Fe3O4 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 Fe3O4 NPs hemisphere coalescence to a magnetic coupling center, recognizing multiple responses simultaneously that correspond the environmental altering. In addition, 2D 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.

Key words: Photonic crystal, Multiple responses, Optical sensing, Supraballs, Microfluidics, Magnetic control