Theory and simulation of anisotropic pair correlations in ferrofluids in magnetic fields / Elfimova Ekaterina A.,Ivanov Alexey O.,Camp Philip J. // JOURNAL OF CHEMICAL PHYSICS. - 2012. - V. 136, l. 19.

ISSN/EISSN:

0021-9606 / нет данных

Type:

Article

Abstract:

Anisotropic pair correlations in ferrofluids exposed to magnetic fields are studied using a combination of statistical-mechanical theory and computer simulations. A simple dipolar hard-sphere model of the magnetic colloidal particles is studied in detail. A virial-expansion theory is constructed for the pair distribution function (PDF) which depends not only on the length of the pair separation vector, but also on its orientation with respect to the field. A detailed comparison is made between the theoretical predictions and accurate simulation data, and it is found that the theory works well for realistic values of the dipolar coupling constant (lambda = 1), volume fraction (phi <= 0.1), and magnetic field strength. The structure factor is computed for wavevectors either parallel or perpendicular to the field. The comparison between theory and simulation is generally very good with realistic ferrofluid parameters. For both the PDF and the structure factor, there are some deviations between theory and simulation at uncommonly high dipolar coupling constants, and with very strong magnetic fields. In particular, the theory is less successful at predicting the behavior of the structure factors at very low wavevectors, and perpendicular Gaussian density fluctuations arising from strongly correlated pairs of magnetic particles. Overall, though, the theory provides reliable predictions for the nature and degree of pair correlations in ferrofluids in magnetic fields, and hence should be of use in the design of functional magnetic materials. (C) 2012 American Institute of Physics. {[}http://dx.doi.org/10.1063/1.4717718]

Author keywords:

PRESSURE VIRIAL-COEFFICIENTS; ANGLE NEUTRON-SCATTERING; HARD-SPHERE FLUIDS; DIPOLAR FLUIDS; PHASE-SEPARATION; LIVING POLYMERS; FERROGELS; TRANSITION; PARTICLES; DYNAMICS

DOI:

10.1063/1.4717718

Web of Science ID:

ISI:000304303500026

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY 21
Publisher	AMER INST PHYSICS
Address	CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Language	English
Article-Number	194502
Keywords-Plus	PRESSURE VIRIAL-COEFFICIENTS; ANGLE NEUTRON-SCATTERING; HARD-SPHERE FLUIDS; DIPOLAR FLUIDS; PHASE-SEPARATION; LIVING POLYMERS; FERROGELS; TRANSITION; PARTICLES; DYNAMICS
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Atomic, Molecular \& Chemical
Author-Email	philip.camp@ed.ac.uk
ResearcherID-Numbers	Elfimova, Ekaterina/P-5003-2016 Ivanov, Alexey/E-4442-2011 Camp, Philip/J-7757-2013
ORCID-Numbers	Ivanov, Alexey/0000-0001-8239-4039 Elfimova, Ekaterian/0000-0002-8941-8184 Camp, Philip/0000-0002-7901-1364
Funding-Acknowledgement	Ministry of Education and Science of the Russian Federation {[}N2.609.2011]; Russian Foundation for Basic Research {[}N10-02-00034-a]
Funding-Text	E.A.E. and A.O.I. gratefully acknowledge grants from the Ministry of Education and Science of the Russian Federation (N2.609.2011) and the Russian Foundation for Basic Research (N10-02-00034-a). E.A.E. thanks the Ural Federal University for supporting a research visit to the University of Edinburgh where this work was completed.
Number-of-Cited-References	45
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	17
Journal-ISO	J. Chem. Phys.
Doc-Delivery-Number	945VC