Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 26, Pages 29826-29834Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06928
Keywords
self-assembly; surface coating; hair dyeing; polyphenol; metal-phenolic networks
Funding
- National Natural Science Foundation of China [21872085]
- Natural Science Foundation of Shandong Province [ZR2019BB056]
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Fast and facile coating strategies play a key role in surface engineering and functionalization of materials for various applications. Herein, we report a rapid and eco-friendly hair dyeing process for natural gray hair via the formation of metal-phenolic networks (MPNs). MPNs composed of gallic acid display high performance, and the coloration is tunable by varying the metal ion types. MPN-based hair dyeing is tolerant to repeated washing (at least 50 times) with detergent solution without color fading and can be discolored in acidic solution (pH < 2). The mechanism of self-assembled MPNs for hair dyeing is investigated by Raman and UV-vis absorption spectroscopy. Cell studies in vitro and skin toxicity tests in vivo demonstrate the advantages (i.e., biocompatibility and hair regrowth) of MPNs for hair dyeing compared to p-phenylenediamine. The reported strategy for hair dyeing avoids the use of toxic substances present in common hair dyes and has negligible damage to the hair structures and tensile strength.
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