Polydopamine-Based 3D Colloidal Photonic Materials: Structural Color Balls and Fibers from Melanin-Like Particles with Polydopamine Shell Layers

Michinari Kohri, Kenshi Yanagimoto, Ayaka Kawamura, Kosuke Hamada, Yoshihiko Imai, Takaichi Watanabe, Tsutomu Ono, Tatsuo Taniguchi, Keiki Kishikawa

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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.

Original languageEnglish
Pages (from-to)7640-7648
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number9
Publication statusPublished - Mar 7 2018


ASJC Scopus subject areas

  • Materials Science(all)

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