Issue 47, 2020

Preparation of interference pigments using black graphite nanosheets

Abstract

Consumer desire for attractive colors necessitates the development of novel pigments that are eco-friendly and durable. The pigments prepared in the present work exhibited enhanced colors caused by thin-film interference through absorption of scattered light by black materials. The graphite nanosheet (GNS) pigments contain no heavy metals and are nonfading pigments composed of exfoliated graphite and TiO2. GNSs, as a novel substrate for interference pigments, were prepared by wet dispersion with a dispersant and a hydrogen peroxide–urea complex to maintain a sheet structure with few defects. We demonstrate for the first time that GNSs that exhibit good dispersibility in water can be prepared via a simple procedure. The GNS pigments were obtained by sol–gel deposition of a TiO2 layer onto dispersant-modified GNSs. Various colors were developed by adjusting the thickness of the TiO2 film by varying the reaction time. Because of the light-absorbing properties originating from the black GNSs and diffuse reflection derived from the random orientation of the GNS pigment in the coating, the coating film exhibited enhanced colors with angle independence.

Graphical abstract: Preparation of interference pigments using black graphite nanosheets

Supplementary files

Article information

Article type
Paper
Submitted
25 Aug 2020
Accepted
13 Nov 2020
First published
13 Nov 2020

J. Mater. Chem. C, 2020,8, 16749-16756

Preparation of interference pigments using black graphite nanosheets

N. Kumano, H. Tanaka, Y. Akimoto and H. Nakamura, J. Mater. Chem. C, 2020, 8, 16749 DOI: 10.1039/D0TC04037A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements