Preparation of yellowish-red Al-substituted αFe2O3 powders and their thermostability in color

Hideki Hashimoto, Makoto Nakanishi, Hiroshi Asaoka, Tomoaki Maeda, Yoshihiro Kusano, Tatsuo Fujii, Jun Takada

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

(Figure Presented) Inspired by the traditional Japanese pigment Fukiya bengala, nanocomposite materials were synthesized using a polymer complex method, comprising Al-substituted α-Fe2O3 (hematite) particles with diameters ranging from 40 to 100 nm and ultrafine Fe-substituted α-Al2O3 (corundum) particles smaller than 10 nm in diameter. The obtained powders exhibited a vivid yellowish-red color and high thermostability, making them attractive as potential overglaze enamels on porcelain. Quantitative color measurements revealed that, when heated to 700, 800, and 900°C, samples displayed high lightness (L∗) and color-opponent dimensions (a∗ and b∗) at 10 mol % Al. For the same particle size samples, L∗, a∗, and b∗ values increased with the Al molar ratio, revealing that Al substitution in the hematite structure intrinsically enhances lightness and chroma in hematite color. These samples mostly retained their color upon reheating at 900°C, indicating their high thermostability. This thermostability should originate from the Al substitution-induced enhancement in lightness and chroma in hematite color, which should counter color fading caused by particle growth. These composite materials are expected to find application in the porcelain industry, cosmetics, and nanotechnology.

Original languageEnglish
Pages (from-to)20282-20289
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number22
DOIs
Publication statusPublished - Nov 26 2014

Fingerprint

Powders
Color
Hematite
Dental Porcelain
Porcelain
Substitution reactions
Corundum
Enamels
Cosmetics
Aluminum Oxide
dihydrobis(2-methoxyethoxy)aluminate
Nanotechnology
Pigments
Nanocomposites
Polymers
Particle size
ferric oxide
Composite materials
Industry

Keywords

  • Aluminum
  • Color
  • Hematite
  • Iron oxides
  • Thermostability

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Preparation of yellowish-red Al-substituted αFe2O3 powders and their thermostability in color. / Hashimoto, Hideki; Nakanishi, Makoto; Asaoka, Hiroshi; Maeda, Tomoaki; Kusano, Yoshihiro; Fujii, Tatsuo; Takada, Jun.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 22, 26.11.2014, p. 20282-20289.

Research output: Contribution to journalArticle

Hashimoto, Hideki ; Nakanishi, Makoto ; Asaoka, Hiroshi ; Maeda, Tomoaki ; Kusano, Yoshihiro ; Fujii, Tatsuo ; Takada, Jun. / Preparation of yellowish-red Al-substituted αFe2O3 powders and their thermostability in color. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 22. pp. 20282-20289.
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