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Eccentric 1-D magnetic core–shell photonic crystal balls: ingenious fabrication and distinctive optical properties

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Abstract

This paper demonstrates eccentric one-dimensional (1-D) core–shell photonic crystal balls (PCBs) with self-displaying structural colours and responsiveness to both the direction and strength of the external magnetic field (H), and a controllable and versatile light intensity-guided morphology-controllable polymerization method. In this protocol, the irradiation of unidirectional UV light on photopolymerizable magnetically responsive photonic crystal (MRPC) droplet templates in a vessel with a reflective bottom substrate enables the light intensity within the droplets to decrease from the outside to the inside in a noncentrosymmetric manner, generating PCBs with an MRPC liquid core eccentrically encapsulated in the 1-D PC hydrogel shell under H by controlling the light irradiation time. Besides the magnetic rotation, the resulting PCBs are capable of collectively self-displaying structural colours without input energy due to the inner-eccentric 1-D PC hydrogel shells. Furthermore, they display dynamically tunable bi-photonic band-gaps under H benefiting from the coexistence of the PC hydrogel shell and the MRPC liquid core. When dispersed in viscous media suppressing the magnetic rotation, they may also exhibit orthogonal bi-photonic band-gaps, enabling a wide-angle display characteristic of 1-D photonic crystals with different colour patterns. These unique modulations in optical properties promise important applications of the as-developed PCBs in bionic chromatic materials, energy-saving displays, switchable signage and anti-counterfeiting coatings.

Graphical abstract: Eccentric 1-D magnetic core–shell photonic crystal balls: ingenious fabrication and distinctive optical properties

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Publication details

The article was received on 06 Feb 2018, accepted on 19 Mar 2018 and first published on 23 Mar 2018


Article type: Paper
DOI: 10.1039/C8TC00640G
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Eccentric 1-D magnetic core–shell photonic crystal balls: ingenious fabrication and distinctive optical properties

    H. Ma, Y. Tan, J. Cao, S. C. Lian, K. Chen, W. Luo and J. Guan, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC00640G

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