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Selective Coloration of Melanin Nanospheres through Resonant Mie Scattering
Soojeong Cho1,2, Tae Soup Shim3,4, Ju Hyeon Kim1
1Department of Chemical and Biomolecular Engineering, KAIST, Daejeon, 34141, South Korea.
Advanced Materials (Deerfield Beach, Fla.)
|April 4, 2017
Abstract:
Black melanin inks are prepared to selectively exhibit colors under strong light, inspired by human hair. High absorbance of melanin suppresses multiple scattering, causing resonant Mie scattering predominant. Various colors can be developed as the resonant wavelength dictated by nanosphere diameter. Therefore, the melanin inks can be used to encrypt and selectively disclose multicolor patterns for anticounterfeiting applications.