Robust Structurally Colored Coatings Composed of Colloidal Arrays Prepared by the Cathodic Electrophoretic Deposition Method with Metal Cation Additives

ACS Applied Materials and Interfaces Volume 12 Issue 36 Page 40768-40777 published_at 2020-08-25
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Title ( eng )
Robust Structurally Colored Coatings Composed of Colloidal Arrays Prepared by the Cathodic Electrophoretic Deposition Method with Metal Cation Additives
Creator
Uemura Kensuke
Uesugi Ryo
Uchikoshi Tetsuo
Seki Takahiro
Takeoka Yukikazu
Source Title
ACS Applied Materials and Interfaces
Volume 12
Issue 36
Start Page 40768
End Page 40777
Abstract
Structurally colored coatings composed of colloidal arrays of monodisperse spherical particles have attracted great attention owing to their versatile advantages, such as low cost, resistance to fading, and low impacts on the environment and human health. However, the weak mechanical stability is considered to be a major obstacle for their practical applications as colorants. Although several approaches based on the addition of polymer additives to enhance the adhesion of particles have been reported, the challenge remains to develop a strategy for the preparation of structurally colored coatings with extremely high robustness using a simple process. Here,we have developed a novel approach to fabricate robust structurally colored coatings by cathodic electrophoretic deposition. The addition of a metal salt,i.e., Mg(NO3)2, to the coating dispersion allows SiO2particles to have a positive charge, which enables the electrophoresis of SiO2 particles toward the cathode. At the cathode, Mg(OH)2 co-deposits with SiO2 particles because OH−ions are generated by the decomposition of dissolved oxygen and NO3−ions. The mechanical stability of the colloidal arrays obtained by this process is remarkably improved because Mg(OH)2 facilitates the adhesion of the particles and substrates. The brilliant structural color is maintained even after several cycles of the sandpaper abrasion test. We have also demonstrated the coating on a stainless steel fork.This demonstration reveals that our approach enables a homogeneous coating on a complicated surface. Furthermore, the high durability of the coating is clarified because the coating did not peel off even when the fork was stuck into a plastic eraser. Therefore,the coating technique developed here will provide an effective method for the pervasive application of the structural color as a colorant.
Keywords
structural color
colloidal arrays
abrasion test
electrophoretic deposition
Descriptions
This work was supported by JSPS KAKENHI grant numbersJP18K19132, JP19H04699, and JP20H02439.
Language
eng
Resource Type journal article
Publisher
American Chemical Society
Date of Issued 2020-08-25
Rights
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.0c10588.
This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。
Publish Type Author’s Original
Access Rights open access
Source Identifier
[ISSN] 1944-8244
[ISSN] 1944-8252
[DOI] 10.1021/acsami.0c10588
[DOI] https://doi.org/10.1021/acsami.0c10588
Remark Post-print version/PDF may be used in an institutional repository after an embargo period of 12 months.