Preparation of superparamagnetic magnetite nanoparticles by reverse precipitation method: Contribution of sonochemically generated oxidants

被引：63

作者：

Mizukoshi, Yoshiteru ^{[1
]}

Shuto, Tatsuya ^{[2
]}

Masahashi, Naoya ^{[1
]}

Tanabe, Shuji ^{[2
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Osaka Ctr Ind Mat Res, Naka Ku, Osaka 5998531, Japan

[2] Nagasaki Univ, Grad Sch Sci & Technol, Nagasaki, Japan

来源：

ULTRASONICS SONOCHEMISTRY | 2009年 / 16卷 / 04期

关键词：

Magnetic nanoparticle; Magnetite; Sonochemical oxidation; COMPOSITE NANOPARTICLES; SEPARATION; FUNCTIONALIZATION; AU/GAMMA-FE2O3; PARTICLES; OXIDE;

D O I：

10.1016/j.ultsonch.2008.12.017

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Magnetic iron oxide nanoparticles were successfully prepared by a novel reverse precipitation method with the irradiation of ultrasound. TEM, XRD and SQUID analyses showed that the formed particles were magnetite (Fe3O4) with about 10 nm in their diameter. The magnetite nanoparticles exhibited superparamagnetism above 200 K, and the saturation magnetization was 32.8 ernu/g at 300 K. The sizes and size distributions could be controlled by the feeding conditions of FeSO4 center dot 7H(2)O aqueous solution, and slower feeding rate and lower concentration lead to smaller and more uniform magnetite nanoparticles. The mechanisms of sonochemical oxidation were also discussed. The analyses of sonochemically produced oxidants in the presence of various gases suggested that besides sonochemically formed hydrogen peroxide, nitrite and nitrate ions contributed to Fe(II) ion oxidation. (c) 2009 Elsevier B.V. All rights reserved.

引用

页码：525 / 531

页数：7

共 34 条

[1] SONOLYSIS OF AQUEOUS SURFACTANT SOLUTIONS - PROBING THE INTERFACIAL REGION OF CAVITATION BUBBLES BY SPIN TRAPPING [J].