Low-temperature magnetic susceptibility of concentrated ferrofluids: The influence of polydispersity / Ivanov A.O., Elfimova E.A. // Journal of Magnetism and Magnetic Materials. - 2015. - V. 374, l. . - P. 327-332.

ISSN:
03048853
Type:
Article
Abstract:
In this paper we address the question of theoretical explanation of extremely high low-temperature initial magnetic susceptibility of concentrated ferrofluids. These laboratory synthesized samples [A.F. Pshenichnikov, A.V. Lebedev, J. Chem. Phys. 121(11) (2004) 5455; Colloid J. 67(2) (2005) 189] demonstrated the record-breaking values χ∼120-150 at temperatures ∼ 230-240 K. The existing models predict such high susceptibility only under the assumption of unreasonably large dipolar coupling constant, which is out of the range of applicability. Here we calculate the second virial contribution to susceptibility for polydisperse ferrofluid, modeled by the dipolar hard sphere fluid. In the resulting expression there exists the parameter, which plays a part of dipolar coupling constant and which is defined in a form of double averaging of high powers of particle sizes over the granulometric distribution. For real particle size distribution this effective parameter at least twice exceeds the commonly defined polydisperse dipolar coupling constant. We show that the low-temperature magnetic susceptibility of the record-breaking ferrofluids could be explained theoretically on the basis of the first terms of the polydisperse second virial contribution in combination with the second-order modified mean field model. © 2015 Elsevier B.V.
Author keywords:
Dipole interaction; Ferrofluid; Magnetic susceptibility; Polydispersity
Index keywords:
Polydispersity; Magnetic fluids; Magnetic susceptibility; Mean field theory; Particle size; Particle size analysis; Particles (particulate matter); Dipole interaction; Ferrofluid; Low temperatures; Di
DOI:
10.1016/j.jmmm.2014.08.067
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907168905&doi=10.1016%2fj.jmmm.2014.08.067&partnerID=40&md5=a258b70b6812fadf87aa3404e4773cb1
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Link https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907168905&doi=10.1016%2fj.jmmm.2014.08.067&partnerID=40&md5=a258b70b6812fadf87aa3404e4773cb1
Affiliations Ural Federal University, Lenin Av. 51, Ekaterinburg, Russian Federation
Author Keywords Dipole interaction; Ferrofluid; Magnetic susceptibility; Polydispersity
Funding Details Ministry of Education and Science of the Russian Federation; 13-01-96032-r, RFBR, Ministry of Education and Science of the Russian Federation
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Correspondence Address Ivanov, A.O.; Ural Federal University, Lenin Av. 51, Russian Federation
Publisher Elsevier
CODEN JMMMD
Language of Original Document English
Abbreviated Source Title J Magn Magn Mater
Source Scopus