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Switchable Full-Color Reflective Photonic Ellipsoidal Particles

Author(s)
He, Qilin; Ku, Kang Hee; Vijayamohanan, Harikrishnan; Kim, Bumjoon J.; Swager, Timothy M
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Abstract
Full-color reflective photonic ellipsoidal polymer particles, capable of a dynamic color change, are created from dendronized brush block copolymers (den-BBCPs) self-assembled by solvent-evaporation from an emulsion. Surfactants composed of dendritic monomer units allow for the precise modulation of the interfacial properties of den-BBCP particles to transition in shape from spheres to striped ellipsoids. Strong steric repulsions between wedge-type monomers promote rapid self-assembly of polymers into large domains (i.e., 153 nm ≤ D ≤ 298 nm). Of note, highly ordered axially stacked lamellae (i.e., number of layers >100) within an ellipsoid give rise to a near-perfect photonic multilayer. The reflecting color is readily tunable across the entire visible spectrum by alteration of the molecular weight from 477 to 1144 kDa. Finally, the photonic ellipsoids are functionalized with magnetic nanoparticles organized into bands on the particle surface to produce real-time on/off coloration by magnetic field-assisted activation. In total, the reported photonic ellipsoidal particles represent a new class of switchable photonic materials.
Date issued
2020-05
URI
https://hdl.handle.net/1721.1/128149
Department
Massachusetts Institute of Technology. Department of Chemistry
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Citation
He, Qilin et al. "Switchable Full-Color Reflective Photonic Ellipsoidal Particles." Journal of the American Chemical Society 142, 23 (May 2020): 10424–10430 © 2020 American Chemical Society
Version: Author's final manuscript
ISSN
0002-7863
1520-5126

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