We prepared magnetic nanoparticles having diameters of approximately 12 nm by chemical coprecipitation, which were coated with three different fatty acid surfactants: oleic acid, lauric acid, and myristic acid. From x-ray diffraction, transmission electron microscopy, and Mössbauer spectroscopy measurements we confirmed that is the only phase present in the samples. The zero field cooled magnetization curves for the nanoparticles exhibit broad peaks, consistent with superparamagnetic blocking for the polydisperse samples, and a saturation magnetization smaller than that for bulk . Although there are minimal differences in the magnetic properties of the nanoparticles having different surfactants, we find significant changes in the hydrodynamic response depending on chain length. Hyperthermia measurements show considerably larger response for oleic acid-coated samples, while magneto-optical studies indicate that these samples have slower dynamics of aggregation under the influence of a dc field. These results suggest that the magnetohydrodynamic response of ferrofluids can be controlled by judiciously selecting appropriate surfactants.
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1 December 2009
Research Article|
December 01 2009
Effects of fatty acid surfactants on the magnetic and magnetohydrodynamic properties of ferrofluids
Rajesh Regmi;
Rajesh Regmi
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
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Correy Black;
Correy Black
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
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C. Sudakar;
C. Sudakar
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
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P. H. Keyes;
P. H. Keyes
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
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Ratna Naik;
Ratna Naik
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
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G. Lawes;
G. Lawes
a)
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
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Prem Vaishnava;
Prem Vaishnava
2Department of Physics,
Kettering University
, Flint, Michigan 48504, USA
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Cornel Rablau;
Cornel Rablau
2Department of Physics,
Kettering University
, Flint, Michigan 48504, USA
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David Kahn;
David Kahn
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
3
Oakland University
, Rochester, Michigan 48309, USA
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Melissa Lavoie;
Melissa Lavoie
1Department of Physics and Astronomy,
Wayne State University
, Detroit, Michigan 48201, USA
3
Oakland University
, Rochester, Michigan 48309, USA
4
Yale University
, New Haven, Connecticut 06511, USA
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Vijayendra K. Garg;
Vijayendra K. Garg
5
Universidade de Brasilia
, Instituto de Fisica, Nucleode Fisica Applicada, 70919-970 Brasilia, DF, Brazil
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A. C. Oliveira
A. C. Oliveira
5
Universidade de Brasilia
, Instituto de Fisica, Nucleode Fisica Applicada, 70919-970 Brasilia, DF, Brazil
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a)
Electronic mail: [email protected].
J. Appl. Phys. 106, 113902 (2009)
Article history
Received:
May 26 2009
Accepted:
October 14 2009
Citation
Rajesh Regmi, Correy Black, C. Sudakar, P. H. Keyes, Ratna Naik, G. Lawes, Prem Vaishnava, Cornel Rablau, David Kahn, Melissa Lavoie, Vijayendra K. Garg, A. C. Oliveira; Effects of fatty acid surfactants on the magnetic and magnetohydrodynamic properties of ferrofluids. J. Appl. Phys. 1 December 2009; 106 (11): 113902. https://doi.org/10.1063/1.3259382
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