Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin

Hideki Hashimoto, Hiroshi Asaoka, Takuya Nakano, Yoshihiro Kusano, Hiromichi Ishihara, Yasunori Ikeda, Makoto Nakanishi, Tatsuo Fujii, Tadanori Yokoyama, Nanao Horiishi, Tokuro Nanba, Jun Takada

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

By heating an amorphous iron oxide produced by Leptothrix ochracea, an iron-oxidizing bacterium species, at 600-1100°C in air for 2 h, vivid red-colored powdered materials including α-Fe 2O 3 (hematite) and amorphous silicate with high thermostability were prepared which offer potential for use as overglaze enamels on porcelain. The precise color tone of the materials greatly depends on the heat-treatment temperature. The most strikingly beautiful sample, heat-treated at 800°C, is light yellowish-red in color (L* = 47.3, a* = 34.1, and b* = 34.6), has a unique microstructure, and does not fade in color even with reheating at 800°C, which is the firing temperature for overglaze enamel on porcelain. The sample primarily consists of crystalline hematite particles ∼40 nm in diameter with slightly longer axis unit-cell parameters than those of pure hematite. The particles are covered with amorphous silicate phase ∼5 nm in thickness and are intricately interconnected into microtubules with an average diameter of 1.26 μm. The attractive color of this material is due to the following structural features: small particle size (∼40 nm), nanocomposite of hematite and amorphous silicate, and a microtubule structure that inhibits aggregation of individual hematite particles and microtubules.

Original languageEnglish
Pages (from-to)639-643
Number of pages5
JournalDyes and Pigments
Volume95
Issue number3
DOIs
Publication statusPublished - Dec 2012

Fingerprint

Silicates
Hematite
Iron oxides
Nanocomposites
Color
Microstructure
Porcelain
Enamels
Dental Porcelain
Bacteria
Agglomeration
Particle size
Heat treatment
ferric oxide
Iron
Crystalline materials
Heating
Temperature
Air

Keywords

  • Amorphous silicate
  • Biogenous iron oxides
  • Hematite
  • Iron-oxidizing bacteria
  • Microtubule
  • Nanocomposite

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

Cite this

Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin. / Hashimoto, Hideki; Asaoka, Hiroshi; Nakano, Takuya; Kusano, Yoshihiro; Ishihara, Hiromichi; Ikeda, Yasunori; Nakanishi, Makoto; Fujii, Tatsuo; Yokoyama, Tadanori; Horiishi, Nanao; Nanba, Tokuro; Takada, Jun.

In: Dyes and Pigments, Vol. 95, No. 3, 12.2012, p. 639-643.

Research output: Contribution to journalArticle

Hashimoto, Hideki ; Asaoka, Hiroshi ; Nakano, Takuya ; Kusano, Yoshihiro ; Ishihara, Hiromichi ; Ikeda, Yasunori ; Nakanishi, Makoto ; Fujii, Tatsuo ; Yokoyama, Tadanori ; Horiishi, Nanao ; Nanba, Tokuro ; Takada, Jun. / Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin. In: Dyes and Pigments. 2012 ; Vol. 95, No. 3. pp. 639-643.
@article{bed890cac1b2495a8ba0e9c54ffb0734,
title = "Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin",
abstract = "By heating an amorphous iron oxide produced by Leptothrix ochracea, an iron-oxidizing bacterium species, at 600-1100°C in air for 2 h, vivid red-colored powdered materials including α-Fe 2O 3 (hematite) and amorphous silicate with high thermostability were prepared which offer potential for use as overglaze enamels on porcelain. The precise color tone of the materials greatly depends on the heat-treatment temperature. The most strikingly beautiful sample, heat-treated at 800°C, is light yellowish-red in color (L* = 47.3, a* = 34.1, and b* = 34.6), has a unique microstructure, and does not fade in color even with reheating at 800°C, which is the firing temperature for overglaze enamel on porcelain. The sample primarily consists of crystalline hematite particles ∼40 nm in diameter with slightly longer axis unit-cell parameters than those of pure hematite. The particles are covered with amorphous silicate phase ∼5 nm in thickness and are intricately interconnected into microtubules with an average diameter of 1.26 μm. The attractive color of this material is due to the following structural features: small particle size (∼40 nm), nanocomposite of hematite and amorphous silicate, and a microtubule structure that inhibits aggregation of individual hematite particles and microtubules.",
keywords = "Amorphous silicate, Biogenous iron oxides, Hematite, Iron-oxidizing bacteria, Microtubule, Nanocomposite",
author = "Hideki Hashimoto and Hiroshi Asaoka and Takuya Nakano and Yoshihiro Kusano and Hiromichi Ishihara and Yasunori Ikeda and Makoto Nakanishi and Tatsuo Fujii and Tadanori Yokoyama and Nanao Horiishi and Tokuro Nanba and Jun Takada",
year = "2012",
month = "12",
doi = "10.1016/j.dyepig.2012.06.024",
language = "English",
volume = "95",
pages = "639--643",
journal = "Dyes and Pigments",
issn = "0143-7208",
publisher = "Elsevier BV",
number = "3",

}

TY - JOUR

T1 - Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin

AU - Hashimoto, Hideki

AU - Asaoka, Hiroshi

AU - Nakano, Takuya

AU - Kusano, Yoshihiro

AU - Ishihara, Hiromichi

AU - Ikeda, Yasunori

AU - Nakanishi, Makoto

AU - Fujii, Tatsuo

AU - Yokoyama, Tadanori

AU - Horiishi, Nanao

AU - Nanba, Tokuro

AU - Takada, Jun

PY - 2012/12

Y1 - 2012/12

N2 - By heating an amorphous iron oxide produced by Leptothrix ochracea, an iron-oxidizing bacterium species, at 600-1100°C in air for 2 h, vivid red-colored powdered materials including α-Fe 2O 3 (hematite) and amorphous silicate with high thermostability were prepared which offer potential for use as overglaze enamels on porcelain. The precise color tone of the materials greatly depends on the heat-treatment temperature. The most strikingly beautiful sample, heat-treated at 800°C, is light yellowish-red in color (L* = 47.3, a* = 34.1, and b* = 34.6), has a unique microstructure, and does not fade in color even with reheating at 800°C, which is the firing temperature for overglaze enamel on porcelain. The sample primarily consists of crystalline hematite particles ∼40 nm in diameter with slightly longer axis unit-cell parameters than those of pure hematite. The particles are covered with amorphous silicate phase ∼5 nm in thickness and are intricately interconnected into microtubules with an average diameter of 1.26 μm. The attractive color of this material is due to the following structural features: small particle size (∼40 nm), nanocomposite of hematite and amorphous silicate, and a microtubule structure that inhibits aggregation of individual hematite particles and microtubules.

AB - By heating an amorphous iron oxide produced by Leptothrix ochracea, an iron-oxidizing bacterium species, at 600-1100°C in air for 2 h, vivid red-colored powdered materials including α-Fe 2O 3 (hematite) and amorphous silicate with high thermostability were prepared which offer potential for use as overglaze enamels on porcelain. The precise color tone of the materials greatly depends on the heat-treatment temperature. The most strikingly beautiful sample, heat-treated at 800°C, is light yellowish-red in color (L* = 47.3, a* = 34.1, and b* = 34.6), has a unique microstructure, and does not fade in color even with reheating at 800°C, which is the firing temperature for overglaze enamel on porcelain. The sample primarily consists of crystalline hematite particles ∼40 nm in diameter with slightly longer axis unit-cell parameters than those of pure hematite. The particles are covered with amorphous silicate phase ∼5 nm in thickness and are intricately interconnected into microtubules with an average diameter of 1.26 μm. The attractive color of this material is due to the following structural features: small particle size (∼40 nm), nanocomposite of hematite and amorphous silicate, and a microtubule structure that inhibits aggregation of individual hematite particles and microtubules.

KW - Amorphous silicate

KW - Biogenous iron oxides

KW - Hematite

KW - Iron-oxidizing bacteria

KW - Microtubule

KW - Nanocomposite

UR - http://www.scopus.com/inward/record.url?scp=84864141567&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84864141567&partnerID=8YFLogxK

U2 - 10.1016/j.dyepig.2012.06.024

DO - 10.1016/j.dyepig.2012.06.024

M3 - Article

AN - SCOPUS:84864141567

VL - 95

SP - 639

EP - 643

JO - Dyes and Pigments

JF - Dyes and Pigments

SN - 0143-7208

IS - 3

ER -