Magnetization behavior of ferrofluids with cryogenically imaged dipolar chains / Klokkenburg M.,Erne B. H. `,Mendelev V.,Ivanov A. O. // JOURNAL OF PHYSICS-CONDENSED MATTER. - 2008. - V. 20, l. 20.

ISSN/EISSN:

0953-8984 / 1361-648X

Type:

Article; Proceedings Paper

Abstract:

Theories and simulations have demonstrated that field-induced dipolar chains affect the static magnetic properties of ferrofluids. Experimental verification, however, has been complicated by the high polydispersity of the available ferrofluids, and the morphology of the dipolar chains was left to the imagination. We now present the concentration- and field-dependent magnetization of particularly well-defined ferrofluids, with a low polydispersity, three different average particle sizes, and with dipolar chains that were imaged with and without magnetic field using cryogenic transmission electron microscopy. At low concentrations, the magnetization curves obey the Langevin equation for noninteracting dipoles. Magnetization curves for the largest particles strongly deviate from the Langevin equation but quantitatively agree with a recently developed mean-field model that incorporates the field-dependent formation and alignment of flexible dipolar chains. The combination of magnetic results and in situ electron microscopy images provides original new evidence for the effect of dipolar chains on the field-dependent magnetization of ferrofluids.

Author keywords:

ALTERNATING-GRADIENT MAGNETOMETER; FIELD; FERROCOLLOIDS; NANOPARTICLES; AGGREGATION; MAGNETITE; FLUIDS

DOI:

10.1088/0953-8984/20/20/204113

Web of Science ID:

ISI:000255661500015

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAY 21
Note	11th International Conference on Magnetic Fluids, Kosice, SLOVAKIA, JUL 23-27, 2007
Publisher	IOP PUBLISHING LTD
Address	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Language	English
Article-Number	204113
EISSN	1361-648X
Keywords-Plus	ALTERNATING-GRADIENT MAGNETOMETER; FIELD; FERROCOLLOIDS; NANOPARTICLES; AGGREGATION; MAGNETITE; FLUIDS
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	M.Klokkenburg@chem.uu.nl B.H.Erne@uu.nl Alexey.Ivanov@usu.ru
ResearcherID-Numbers	Ivanov, Alexey/E-4442-2011 Erne, Ben/E-8284-2012 Institute (DINS), Debye/G-7730-2014
ORCID-Numbers	Ivanov, Alexey/0000-0001-8239-4039 Erne, Ben/0000-0001-7392-6443
Number-of-Cited-References	28
Usage-Count-Since-2013	8
Journal-ISO	J. Phys.-Condes. Matter
Doc-Delivery-Number	298BO