On the Fe3O4/Mn1-xZnxFe2O4 core/shell magnetic nanoparticles

被引：28

作者：

Hong, R. Y. ^{[1
,2
,3
]}

Li, J. H. ^{[1
,2
]}

Cao, X. ^{[1
,2
]}

Zhang, S. Z. ^{[1
,2
]}

Di, G. Q. ^{[4
]}

Li, H. Z. ^{[3
]}

Wei, D. G. ^{[5
]}

机构：

[1] Soochow Univ, Coll Chem Chem Engn & Mat Sci, SIP, Suzhou 215123, Peoples R China

[2] Soochow Univ, Key Lab Organ Synth Jiangsu Prov, SIP, Suzhou 215123, Peoples R China

[3] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100080, Peoples R China

[4] Soochow Univ, Dept Phys, Suzhou 215007, Peoples R China

[5] Harvard Univ, Ctr Nanoscale Syst, Sch Engn & Appl Sci, Cambridge, MA 02139 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 480卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Composite materials; Oxide materials; Chemical synthesis; Magnetic measurements; FE3O4; NANOPARTICLES; BIOMEDICAL APPLICATIONS; BARIUM HEXAFERRITE; AQUEOUS-SOLUTIONS; FLUIDS; FERRITES; FERROFLUIDS; PARTICLES; CHITOSAN;

D O I：

10.1016/j.jallcom.2009.02.098

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：

Fe3O4 magnetic nanoparticles (NPs) were synthesized by the co-precipitation of Fe3+ and Fe2+ with ammonium hydroxide under hydrazine hydrate, and were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). In order to improve the particle dispersion, the bare Fe3O4 magnetic NPs were surface modified by sodium citrate under Ar protection. Mn-Zn ferrite NPs were prepared by co-precipitation. A group of orthogonal tests (L4(5)) were arranged to investigate the effects of reaction temperature, and OH- and Fe3+ concentrations on the magnetic property of Mn-Zn ferrite. It was found that the saturation magnetization increases evidently with the increasing reaction temperature. The effects of OH- and Fe3+ concentrations on the magnetic property are minor. Mn-Zn ferrite NPs with high saturation magnetization (53 emu/g) were obtained. The XRD and element analysis for the Mn-Zn ferrite NPs indicates the particles are pure Mn0.8Zn0.2Fe2O4. Finally, Fe3O4/Mn0.8Zn0.2Fe2O4 core/shell nanocomposites were prepared by co-precipitation under the same condition. The core/shell nanocomposites obtained in the optimal condition demonstrate the highest saturation magnetization of 68 emu/g. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：947 / 953

页数：7

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