Low-temperature magnetic susceptibility of concentrated ferrofluids: The influence of polydispersity / Ivanov Alexey O.,Elfimova Ekaterina A. // JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - 2015. - V. 374, l. . - P. 327-332.

ISSN/EISSN:

0304-8853 / 1873-4766

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 chi similar to 120-150 at temperatures similar to 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 polyclisperse second virial contribution in combination with the second-order modified mean field model. (C) 2014 Elsevier B.V. All rights reserved

Author keywords:

Ferrofluid; Magnetic susceptibility; Dipole interaction; Polyclispersity HARD-SPHERES; FLUIDS; FERROCOLLOIDS; PARTICLES; MOMENTS; FIELD

DOI:

10.1016/j.jmmm.2014.08.067

Web of Science ID:

ISI:000344949000051

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN 15
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-4766
Keywords-Plus	HARD-SPHERES; FLUIDS; FERROCOLLOIDS; PARTICLES; MOMENTS; FIELD
Research-Areas	Materials Science; Physics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Physics, Condensed Matter
Author-Email	Alexey.Ivanov@usu.ru
ResearcherID-Numbers	Ivanov, Alexey/E-4442-2011 Elfimova, Ekaterina/P-5003-2016 lotfollahi, zahra/A-6419-2015
ORCID-Numbers	Ivanov, Alexey/0000-0001-8239-4039 Elfimova, Ekaterian/0000-0002-8941-8184
Funding-Acknowledgement	Ministry of Education and Science of the Russian Federation {[}02.A03.21.000, 3.2.2014/K]; Russian Foundation for Basic Research {[}13-01-96032-r-ural]
Funding-Text	The research was carried out within the financial support of the Ministry of Education and Science of the Russian Federation (Contract 02.A03.21.000, Project 3.2.2014/K) and was also partly supported by the Russian Foundation for Basic Research (Grant No. 13-01-96032-r-ural).
Number-of-Cited-References	40
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	16
Journal-ISO	J. Magn. Magn. Mater.
Doc-Delivery-Number	AT4YL