Study of the structure factor anisotropy and long range correlations of ferrofluids in the dilute low-coupling regime / Cerda Juan J.,Elfimova Ekaterina,Ballenegger V.,Krutikova Ekaterina,Ivanov Alexey,Holm Christian // JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - 2011. - V. 323, l. 10. - P. 1246-1253.

ISSN/EISSN:

0304-8853 / нет данных

Type:

Article; Proceedings Paper

Abstract:

Dipolar soft-sphere (DSS) fluids in the dilute low-coupling regime are studied via Molecular Dynamic simulations and the extension of a theoretical formalism previously used for dipolar hard spheres in which new terms for the virial expansion of the radial distribution function corresponding to the three-particle contribution are presented and tested for the zero and non-zero magnetic field case. A thorough comparison with simulations shows that the extended formalism is able to account for the structure factors of DSS with and without externally applied magnetic fields in the dilute low-coupling regime: quantitative agreement between theory and simulations is found for dipolar coupling parameters lambda less than or similar to 2, and volume fraction phi less than or similar to 0.25. When lambda>1 the new added term to the virial expansion is observed to play a crucial role in order to match quantitatively theory and simulations at zero field. In the presence of an external magnetic field our tests show that further improvements are needed and only new terms with Langevin function dependences can significatively contribute to improve the predictions for the dilute low-coupling regime. Numerical simulations show that despite that the ferrofluids considered here are in the dilute low-coupling regime, when an external field is applied, important correlations along the parallel direction to the field and depletion phenomena along the perpendicular direction are observed in the averaged density surrounding a particle. (C) 2010 Elsevier B.V. All rights reserved.

Author keywords:

Ferrofluid; Dipolar soft-sphere fluid; Structure factor; Theory; Molecular dynamics simulation CHARGED MAGNETIC COLLOIDS; ANGLE NEUTRON-SCATTERING; HARD-SPHERES; FERROCOLLOIDS; DYNAMICS; LIQUIDS; FLUIDS; FIELD

DOI:

10.1016/j.jmmm.2010.11.015

Web of Science ID:

ISI:000287738100013

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAY
Note	12th International Conference on Magnetic Fluids (ICMF12), Sendai, JAPAN, AUG 01-05, 2010
Organization	Magnetic Fluid Assoc
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	CHARGED MAGNETIC COLLOIDS; ANGLE NEUTRON-SCATTERING; HARD-SPHERES; FERROCOLLOIDS; DYNAMICS; LIQUIDS; FLUIDS; FIELD
Research-Areas	Materials Science; Physics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Physics, Condensed Matter
Author-Email	joan@ifisc.uib-csic.es
ResearcherID-Numbers	Elfimova, Ekaterina/P-5003-2016 Novak, Ekaterina/K-9016-2013 Cerda, Joan Josep/H-1306-2013 Holm, Christian/C-2134-2009 Ivanov, Alexey/E-4442-2011
ORCID-Numbers	Novak, Ekaterina/0000-0002-4034-6861 Cerda, Joan Josep/0000-0003-1132-5989 Holm, Christian/0000-0003-2739-310X Ivanov, Alexey/0000-0001-8239-4039 Elfimova, Ekaterian/0000-0002-8941-8184
Number-of-Cited-References	31
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	9
Journal-ISO	J. Magn. Magn. Mater.
Doc-Delivery-Number	726PM