Ferrofluid with clustered iron nanoparticles: Slow relaxation of rheological properties under joint action of shear flow and magnetic field / Borin Dmitry,Zubarev Andrey,Chirikov Dmitry,Mueller Robert,Odenbach Stefan // JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - 2011. - V. 323, l. 10. - P. 1273-1277.

ISSN/EISSN:

0304-8853 / нет данных

Type:

Article; Proceedings Paper

Abstract:

Rheological experiments on relaxation of shear stress in a diluted ferrofluid with clustered iron oxide nanoparticles (phi=0.1 vol\%) have been performed. Changes of the stress appearing in the fluid at constant magnetic field strength after a stepwise change of shear rate gamma have been measured. It has been found that the time of the transient, until the shear stress in the fluid will be steady, depends strongly on the strength of the applied magnetic field and shear rate. For vanishing magnetic field slow relaxation has not been observed. The time of the transient in the presence of a magnetic field can reach several minutes. The change of the transient viscosity eta(t=1/gamma) (gamma) as a function of the steady viscosity eta(t ->infinity) (gamma) shows a linear behavior and depends on magnetic field strength. Those effects can be attributed to the process of structure formation and destruction due to the simultaneous action of an applied magnetic field and shear flow. A similar behavior is known from the rheology of complex fluids like polymer melts or aggregating colloids. We propose a model of the rheological effects based on the assumption that the clusters form linear chains which size distribution is determined by applied magnetic field and shear rate. (C) 2010 Elsevier B.V. All rights reserved.

Author keywords:

Ferrofluid; Rheology; Slow relaxation; Iron cluster; Stress overshoot SUSPENSIONS

DOI:

10.1016/j.jmmm.2010.11.020

Web of Science ID:

ISI:000287738100018

Соавторы в МНС:

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	SUSPENSIONS
Research-Areas	Materials Science; Physics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Physics, Condensed Matter
Author-Email	dmitry.borin@tu-dresden.de
ResearcherID-Numbers	Borin, Dmitry/D-4652-2009 Zubarev, Adrey/B-4752-2014 Odenbach, Stefan/D-4542-2009
ORCID-Numbers	Borin, Dmitry/0000-0003-3842-1487
Number-of-Cited-References	14
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	22
Journal-ISO	J. Magn. Magn. Mater.
Doc-Delivery-Number	726PM