Continuous synthesis of fine MgFe2O4 nanoparticles by supercritical hydrothermal reaction

被引：79

作者：

Sasaki, Takafumi ^{[1
]}

Ohara, Satoshi ^{[1
]}

Naka, Takashi ^{[1
]}

Vejpravova, Jana ^{[2
]}

Sechovsky, Vladimir ^{[2
]}

Umetsu, Mitsuo ^{[1
]}

Takami, Seiichi ^{[1
]}

Jeyadevan, Balachandran ^{[3
]}

Adschiri, Tadafumi ^{[1
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Charles Univ Prague, Fac Math & Phys, Dept Elect Struct, CR-12116 Prague 2, Czech Republic

[3] Tohoku Univ, Grad Sch Environm Studies, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF SUPERCRITICAL FLUIDS | 2010年 / 53卷 / 1-3期

关键词：

Flow method; Hydrothermal synthesis; Supercritical water; MgFe2O4; ZINC-OXIDE NANOPARTICLES; MAGNESIUM FERRITE; SUPERPARAMAGNETIC PROPERTIES; INORGANIC MATERIALS; WATER; THERAPY; DESIGN; AEROGELS; FLUIDS;

D O I：

10.1016/j.supflu.2009.11.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 degrees 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 alpha-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. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：92 / 94

页数：3

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