Continuous synthesis of fine MgFe2O4 nanoparticles by supercritical hydrothermal reaction

Takafumi Sasaki; Satoshi Ohara; Takashi Naka; Jana Vejpravova; Vladimir Sechovsky; Mitsuo Umetsu; Seiichi Takami; Balachandran Jeyadevan; Tadafumi Adschiri

doi:10.1016/j.supflu.2009.11.005

Continuous synthesis of fine MgFe₂O₄ nanoparticles by supercritical hydrothermal reaction

Takafumi Sasaki, Satoshi Ohara, Takashi Naka, Jana Vejpravova, Vladimir Sechovsky, Mitsuo Umetsu, Seiichi Takami, Balachandran Jeyadevan, Tadafumi Adschiri

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

86 Citations (Scopus)

Abstract

We produced magnesium ferrite (MgFe₂O₄) nanoparticles by hydrothermal synthesis in supercritical water. Suspensions containing varying ratios of Mg(OH)₂ and Fe(OH)₃ at room temperature were pressurized to 30 MPa, fed into a tubular reactor by high-pressure pump, and rapidly heated to reaction temperature by mixing with supercritical water. The MgFe₂O₄ phase forms at 460 °C. The Mg/Fe molar ratio was varied from 0.5 to 1.5 with the goal of obtaining single-phase MgFe₂O₄. At the stoichiometric ratio for MgFe₂O₄, Mg/Fe = 0.5, the product contains both MgFe₂O₄ and α-Fe₂O₃. At Mg/Fe = 1.0 and 1.5, the product is the desired single-phase MgFe₂O₄. The synthesized MgFe₂O₄ nanoparticles, with particle size of about 20 nm, exhibit superparamagnetic behavior.

Original language	English
Pages (from-to)	92-94
Number of pages	3
Journal	Journal of Supercritical Fluids
Volume	53
Issue number	1-3
DOIs	https://doi.org/10.1016/j.supflu.2009.11.005
Publication status	Published - 2010 Jun

Keywords

Flow method
Hydrothermal synthesis
MgFeO
Supercritical water

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title = "Continuous synthesis of fine MgFe2O4 nanoparticles by supercritical hydrothermal reaction",

abstract = "We produced magnesium ferrite (MgFe2O4) nanoparticles by hydrothermal synthesis in supercritical water. Suspensions containing varying ratios of Mg(OH)2 and Fe(OH)3 at room temperature were pressurized to 30 MPa, fed into a tubular reactor by high-pressure pump, and rapidly heated to reaction temperature by mixing with supercritical water. The MgFe2O4 phase forms at 460 °C. The Mg/Fe molar ratio was varied from 0.5 to 1.5 with the goal of obtaining single-phase MgFe2O4. At the stoichiometric ratio for MgFe2O4, Mg/Fe = 0.5, the product contains both MgFe2O4 and α-Fe2O3. At Mg/Fe = 1.0 and 1.5, the product is the desired single-phase MgFe2O4. The synthesized MgFe2O4 nanoparticles, with particle size of about 20 nm, exhibit superparamagnetic behavior.",

keywords = "Flow method, Hydrothermal synthesis, MgFeO, Supercritical water",

author = "Takafumi Sasaki and Satoshi Ohara and Takashi Naka and Jana Vejpravova and Vladimir Sechovsky and Mitsuo Umetsu and Seiichi Takami and Balachandran Jeyadevan and Tadafumi Adschiri",

year = "2010",

month = jun,

doi = "10.1016/j.supflu.2009.11.005",

language = "English",

volume = "53",

pages = "92--94",

journal = "Journal of Supercritical Fluids",

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T1 - Continuous synthesis of fine MgFe2O4 nanoparticles by supercritical hydrothermal reaction

AU - Sasaki, Takafumi

AU - Ohara, Satoshi

AU - Naka, Takashi

AU - Vejpravova, Jana

AU - Sechovsky, Vladimir

AU - Umetsu, Mitsuo

AU - Takami, Seiichi

AU - Jeyadevan, Balachandran

AU - Adschiri, Tadafumi

PY - 2010/6

Y1 - 2010/6

N2 - We produced magnesium ferrite (MgFe2O4) nanoparticles by hydrothermal synthesis in supercritical water. Suspensions containing varying ratios of Mg(OH)2 and Fe(OH)3 at room temperature were pressurized to 30 MPa, fed into a tubular reactor by high-pressure pump, and rapidly heated to reaction temperature by mixing with supercritical water. The MgFe2O4 phase forms at 460 °C. The Mg/Fe molar ratio was varied from 0.5 to 1.5 with the goal of obtaining single-phase MgFe2O4. At the stoichiometric ratio for MgFe2O4, Mg/Fe = 0.5, the product contains both MgFe2O4 and α-Fe2O3. At Mg/Fe = 1.0 and 1.5, the product is the desired single-phase MgFe2O4. The synthesized MgFe2O4 nanoparticles, with particle size of about 20 nm, exhibit superparamagnetic behavior.

AB - We produced magnesium ferrite (MgFe2O4) nanoparticles by hydrothermal synthesis in supercritical water. Suspensions containing varying ratios of Mg(OH)2 and Fe(OH)3 at room temperature were pressurized to 30 MPa, fed into a tubular reactor by high-pressure pump, and rapidly heated to reaction temperature by mixing with supercritical water. The MgFe2O4 phase forms at 460 °C. The Mg/Fe molar ratio was varied from 0.5 to 1.5 with the goal of obtaining single-phase MgFe2O4. At the stoichiometric ratio for MgFe2O4, Mg/Fe = 0.5, the product contains both MgFe2O4 and α-Fe2O3. At Mg/Fe = 1.0 and 1.5, the product is the desired single-phase MgFe2O4. The synthesized MgFe2O4 nanoparticles, with particle size of about 20 nm, exhibit superparamagnetic behavior.

KW - Flow method

KW - Hydrothermal synthesis

KW - MgFeO

KW - Supercritical water

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JO - Journal of Supercritical Fluids

JF - Journal of Supercritical Fluids

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ER -

Continuous synthesis of fine MgFe₂O₄ nanoparticles by supercritical hydrothermal reaction

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Keywords

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