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[ACS Applied Materials & Interfaces] Polydopamine-Based 3D Colloidal Photonic Materials: Structu


Nature creates beautiful structural colors, and some of these colors are produced by nanostructural arrays of melanin. Polydopamine (PDA), an artificial black polymer produced by self-oxidative polymerization of dopamine, has attracted extensive attention because of its unique properties. PDA is a melanin-like material, and recent studies have reported that photonic materials based on PDA particles showed structural colors by enhancing color saturation through the absorption of scattered light. Herein, we describe the preparation of three-dimensional (3D) colloidal photonic materials, such as structural color balls and fibers, from biomimetic core–shell particles with melanin-like PDA shell layers. Structural color balls were prepared through the combined use of membrane emulsion and heating. We also demonstrated the use of microfluidic emulsification and solvent diffusion for the fabrication of structural color fibers. The obtained 3D colloidal materials, i.e., balls and fibers, exhibited angle-independent structural colors due to the amorphous assembly of PDA-containing particles. These findings provide new insight for the development of dye-free technology for the coloration of various 3D colloidal architectures.

Michinari Kohri*† , Kenshi Yanagimoto†, Ayaka Kawamura†, Kosuke Hamada†, Yoshihiko Imai‡, Takaichi Watanabe‡, Tsutomu Ono‡, Tatsuo Taniguchi†, and Keiki Kishikawa† † Division of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan ‡ Department of Applied Chemistry and Biotechnology, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan ACS Appl. Mater. Interfaces, Article ASAP DOI: 10.1021/acsami.7b03453 Publication Date (Web): June 29, 2017 Copyright © 2017 American Chemical Society *E-mail: kohri@faculty.chiba-u.jp. Link: http://pubs.acs.org/doi/abs/10.1021/acsami.7b03453

#07012017 #MaterialScience #particle #colloid

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