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Janus Multicolored Photonic Crystal Beads for Real‐Time Magnetic Responsive Patterns
Author(s) -
Huang Chao,
Cheng Yu,
Zhang Hanbing,
Wei Jie
Publication year - 2019
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201900238
Subject(s) - janus , structural coloration , materials science , janus particles , nanotechnology , nanoparticle , colloid , photonic crystal , emulsion , photonics , magnetic nanoparticles , micrometer , chemical engineering , optoelectronics , optics , engineering , physics
Photonic Janus particles that can change colors in different stimuli have shown great promise in various applications, such as optical probes, catalyst supports, sensors, and display materials. However, it remains a challenge to produce Janus structural colored particles with a simple method. Inspired from ecsenius bicolors, a facile preparation of Janus structural colored beads (JSCBs) using sub‐micrometer‐sized colloidal particles and magnetic nanoparticles composed of Fe 3 O 4 is established. A mixed emulsion is prepared by monodispersed colloidal particles and magnetic nanoparticles and initiator of PDMS precursor. Subsequent self‐assembly of the emulsion in the room temperature environment provides two different structural colors, thanks to the gravity deposition of colloidal particles and Fe 3 O 4 nanoparticles. The photonic bandgap of JSCBs can be precisely controlled with varying size of monodispersed colloidal nanoparticles, and the high optical quality and mechanical strength of the structural colored face are attributed to the existence of PDMS. In the presence of a magnet, the JSCBs can change their orientation simultaneously between two different structural colors. Moreover, the JSCBs are capable of encoding and angle‐independent displaying, which are crucial to their applications in anticounterfeiting, information coding, and pattern display.