Magnetic properties of extremely bimodal magnetite suspensions

被引：25

作者：

Viota, J. L. ^{[1
]}

Duran, J. D. G. ^{[1
]}

Gonzalez-Caballero, F. ^{[1
]}

Delgado, A. V. ^{[1
]}

机构：

[1] Univ Granada, Dept Appl Phys, Sch Sci, E-18071 Granada, Spain

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 314卷 / 02期

关键词：

bimodal magnetite suspension; coercive field; ferrofluid; magnetic susceptibility; magnetorheological suspension;

D O I：

10.1016/j.jmmm.2007.02.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, we investigate the magnetic properties of aqueous suspensions of extremely bimodal magnetite particles, including micro- (size-1450 nm) and nano-(size -9 nm) units. It is found that the addition of increasing concentrations of small particles increases the saturation magnetization, the coercive field, and the low-field susceptibility. The results are explained considering that the nanomagnetite used has a moderately wide size distribution, that embraces both the range of superparamagnetism (the lowest size interval) and of finite coercivity, all being single domain. In addition, the formation of a cloud of small particles surrounding the larger ones favors the chain formation by dipolar magnetic aggregation. It is concluded that the admixture of even small amounts of nanoparticles offers an excellent tool for the control of the magnetic properties of magnetite suspensions. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：80 / 86

页数：7

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