Scaling behaviour of the structure factor of chain-forming ferrofluids at low wave vectors / Ivanov A. O.,Kantorovich S. S.,Pyanzina E. S. // MAGNETOHYDRODYNAMICS. - 2008. - V. 44, l. 1. - P. 33-38.

ISSN/EISSN:

0024-998X / нет данных

Type:

Article; Proceedings Paper

Abstract:

Computer simulations of the structure and scattering in chain-forming ferrofluids have revealed an anomalous behaviour of the structure factor S(q) at low values of the wave vector q. In the region q sigma < pi (sigma stands for the particle diameter), the structure factor obeys the power-law decrease S(q) similar to q(-D), and the scaling exponent D is close to unity. This feature holds true for the ferrofluids with a rather high dipolar coupling constant lambda = m(2)/k(B)T sigma(3) (m is the particle magnetic moment, and k(B)T is the thermal energy), lambda > 4. The discovered anomaly was explained in terms of ferroparticle aggregates, the most probable structure of which is evidently the chain one. In this report the chain model of a ferrofluid at the high dipolar strength lambda is used to study theoretically the scaling low-q behaviour of the structure factor. The radial distribution function is determined on the base of the statistic algorithm commonly used in computer simulations, and the structure factor is calculated according to its definition as the Fourier transform of the radial distribution function. The log-log plot of the structure factor S against wave vector q shows the linear dependence in the region 1 < q sigma < pi for low concentrated chain-forming ferrofluids. These theoretical predictions are in a good qualitative and quantitative agreement with the simulation results.

Author keywords:

MAGNETIC FLUIDS; PARTICLES

DOI:

нет данных

Web of Science ID:

ISI:000254986600005

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN-MAR
Note	11th International Conference on Magnetic Fluids, Kosice, SLOVAKIA, JUL 23-27, 2007
Publisher	UNIV LATVIA INST PHYSICS
Address	MIERA 32, SALASPILS, LV-2169, LATVIA
Language	English
Keywords-Plus	MAGNETIC FLUIDS; PARTICLES
Research-Areas	Mechanics; Physics
Web-of-Science-Categories	Mechanics; Physics, Fluids \& Plasmas
ResearcherID-Numbers	Ivanov, Alexey/E-4442-2011 Kantorovich, Sofia/H-4586-2011
ORCID-Numbers	Ivanov, Alexey/0000-0001-8239-4039 Kantorovich, Sofia/0000-0001-5700-7009
Number-of-Cited-References	17
Usage-Count-Since-2013	11
Journal-ISO	Magnetohydrodynamics
Doc-Delivery-Number	288KZ