Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin

Hideki Hashimoto; Tatsuo Fujii; Makoto Nakanishi; Yoshihiro Kusano; Yasunori Ikeda; Jun Takada

doi:10.1016/j.matchemphys.2012.08.070

Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin

Hideki Hashimoto, Tatsuo Fujii, Makoto Nakanishi, Yoshihiro Kusano, Yasunori Ikeda, Jun Takada

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Magnetic nanocomposites containing magnetite (Fe ₃O ₄) nanoparticles were prepared from iron oxide microtubules produced by Leptothrix ochracea, a species of water-habitant iron-oxidizing bacteria. The microtubules were mainly composed of Si-containing ferric hydroxide that shows a broad X-ray diffraction pattern similar to that of 2-line ferrihydrite. After moderate heat treatment in a reductive atmosphere above 325 °C, the ferric ions were partially reduced to a ferrous state, and nanocrystalline Fe ₃O ₄ with a spinel-type structure was formed in a noncrystalline silicate matrix. The average crystallite size of the Fe ₃O ₄ nanoparticles was estimated to be in the order of a few nanometers. The sample heat-treated at 500 °C exhibited considerable magnetization together with superparamagnetic behavior at room temperature, and super-spin-glass interaction occurred at low temperature. On further heat treatment above 530 °C, Fe ₃O ₄ was reduced to wüstite (Fe ₁ _-xO) and finally crystallized into iron metal (α-Fe) and ferrous silicate (Fe ₂SiO ₄).

Original language	English
Pages (from-to)	1156-1161
Number of pages	6
Journal	Materials Chemistry and Physics
Volume	136
Issue number	2-3
DOIs	https://doi.org/10.1016/j.matchemphys.2012.08.070
Publication status	Published - Oct 15 2012

Keywords

Amorphous materials
Heat treatment
Magnetic materials
Magnetometer (for magnetic field, susceptibility, magnetic moment, magnetisation measurements)
Nanostructures

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1016/j.matchemphys.2012.08.070

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title = "Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin",

abstract = "Magnetic nanocomposites containing magnetite (Fe 3O 4) nanoparticles were prepared from iron oxide microtubules produced by Leptothrix ochracea, a species of water-habitant iron-oxidizing bacteria. The microtubules were mainly composed of Si-containing ferric hydroxide that shows a broad X-ray diffraction pattern similar to that of 2-line ferrihydrite. After moderate heat treatment in a reductive atmosphere above 325 °C, the ferric ions were partially reduced to a ferrous state, and nanocrystalline Fe 3O 4 with a spinel-type structure was formed in a noncrystalline silicate matrix. The average crystallite size of the Fe 3O 4 nanoparticles was estimated to be in the order of a few nanometers. The sample heat-treated at 500 °C exhibited considerable magnetization together with superparamagnetic behavior at room temperature, and super-spin-glass interaction occurred at low temperature. On further heat treatment above 530 °C, Fe 3O 4 was reduced to w{\"u}stite (Fe 1 -xO) and finally crystallized into iron metal (α-Fe) and ferrous silicate (Fe 2SiO 4).",

keywords = "Amorphous materials, Heat treatment, Magnetic materials, Magnetometer (for magnetic field, susceptibility, magnetic moment, magnetisation measurements), Nanostructures",

author = "Hideki Hashimoto and Tatsuo Fujii and Makoto Nakanishi and Yoshihiro Kusano and Yasunori Ikeda and Jun Takada",

note = "Funding Information: This study was financially supported by the Special Funds for Education and Research from the Ministry of Education, Culture, Sports, Science and Technology (for J.T.) and the Grant-in-Aid for Research Activity start-up (No. 22860040 , 2010 and 2011, H.H).",

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T1 - Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin

AU - Hashimoto, Hideki

AU - Fujii, Tatsuo

AU - Nakanishi, Makoto

AU - Kusano, Yoshihiro

AU - Ikeda, Yasunori

AU - Takada, Jun

N1 - Funding Information: This study was financially supported by the Special Funds for Education and Research from the Ministry of Education, Culture, Sports, Science and Technology (for J.T.) and the Grant-in-Aid for Research Activity start-up (No. 22860040 , 2010 and 2011, H.H).

PY - 2012/10/15

Y1 - 2012/10/15

N2 - Magnetic nanocomposites containing magnetite (Fe 3O 4) nanoparticles were prepared from iron oxide microtubules produced by Leptothrix ochracea, a species of water-habitant iron-oxidizing bacteria. The microtubules were mainly composed of Si-containing ferric hydroxide that shows a broad X-ray diffraction pattern similar to that of 2-line ferrihydrite. After moderate heat treatment in a reductive atmosphere above 325 °C, the ferric ions were partially reduced to a ferrous state, and nanocrystalline Fe 3O 4 with a spinel-type structure was formed in a noncrystalline silicate matrix. The average crystallite size of the Fe 3O 4 nanoparticles was estimated to be in the order of a few nanometers. The sample heat-treated at 500 °C exhibited considerable magnetization together with superparamagnetic behavior at room temperature, and super-spin-glass interaction occurred at low temperature. On further heat treatment above 530 °C, Fe 3O 4 was reduced to wüstite (Fe 1 -xO) and finally crystallized into iron metal (α-Fe) and ferrous silicate (Fe 2SiO 4).

AB - Magnetic nanocomposites containing magnetite (Fe 3O 4) nanoparticles were prepared from iron oxide microtubules produced by Leptothrix ochracea, a species of water-habitant iron-oxidizing bacteria. The microtubules were mainly composed of Si-containing ferric hydroxide that shows a broad X-ray diffraction pattern similar to that of 2-line ferrihydrite. After moderate heat treatment in a reductive atmosphere above 325 °C, the ferric ions were partially reduced to a ferrous state, and nanocrystalline Fe 3O 4 with a spinel-type structure was formed in a noncrystalline silicate matrix. The average crystallite size of the Fe 3O 4 nanoparticles was estimated to be in the order of a few nanometers. The sample heat-treated at 500 °C exhibited considerable magnetization together with superparamagnetic behavior at room temperature, and super-spin-glass interaction occurred at low temperature. On further heat treatment above 530 °C, Fe 3O 4 was reduced to wüstite (Fe 1 -xO) and finally crystallized into iron metal (α-Fe) and ferrous silicate (Fe 2SiO 4).

KW - Amorphous materials

KW - Heat treatment

KW - Magnetic materials

KW - Magnetometer (for magnetic field, susceptibility, magnetic moment, magnetisation measurements)

KW - Nanostructures

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ER -

Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin

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