Stability and magnetorheological behaviour of magnetic fluids based on ionic liquids / Rodriguez-Arco Laura,Lopez-Lopez Modesto T.,Duran Juan D. G.,Zubarev Andrey,Chirikov Dmitrij // JOURNAL OF PHYSICS-CONDENSED MATTER. - 2011. - V. 23, l. 45.

ISSN/EISSN:

0953-8984 / нет данных

Type:

Article

Abstract:

This paper reports the preparation of magnetic fluids consisting of magnetite nanoparticles dispersed in an ionic liquid. Different additives were used in order to stabilize the fluids. Colloidal stability was checked by magnetic sedimentation, centrifugation and direct observation. The results of these tests showed that a true ferrofluid was only obtained when the nanoparticles were coated with a layer of surfactant compatible with the ionic liquid. These experiments also showed that stability could not be reached just by electrostatic repulsion. The conclusions of the stability tests were confirmed by calculations of the interparticle energies of interaction. The rheological behaviour of the magnetic fluids upon magnetic field application was also investigated. The experimental magnetoviscous response was fitted by a microstructural model. The model considered that the fluids consisted of two populations of particles, one with a magnetic core diameter of 9 nm, and another with a larger diameter. Upon field application chain-like structures are supposed to be induced. According to estimations particles of 9 nm are too small to aggregate upon field application. The results of the calculations showed that the intensity of the magnetoviscous response depends on the concentration and size of the large particles, and on the thickness of the surfactant layers.

Author keywords:

RHEOLOGICAL PROPERTIES; BROWNIAN-MOTION; FERROFLUIDS; NANOPARTICLES; PARTICLES; SUSPENSIONS; COLLOIDS; POWDERS

DOI:

10.1088/0953-8984/23/45/455101

Web of Science ID:

ISI:000296794700001

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV 16
Publisher	IOP PUBLISHING LTD
Address	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Language	English
Article-Number	455101
Keywords-Plus	RHEOLOGICAL PROPERTIES; BROWNIAN-MOTION; FERROFLUIDS; NANOPARTICLES; PARTICLES; SUSPENSIONS; COLLOIDS; POWDERS
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	modesto@ugr.es
ResearcherID-Numbers	Zubarev, Adrey/B-4752-2014 Lopez-Duran, Juan de Dios/M-2774-2014 Lopez-Lopez, Modesto T/K-7327-2012 Rodriguez-Arco, Laura/K-6056-2014
ORCID-Numbers	Lopez-Duran, Juan de Dios/0000-0002-5586-1276 Lopez-Lopez, Modesto T/0000-0002-9068-7795 Rodriguez-Arco, Laura/0000-0002-5527-7547
Funding-Acknowledgement	Junta de Andalucia, Spain {[}P08-FQM-3993, P09-FQM-4787]; MICINN, Spain {[}FIS2009-07321]; University of Granada (Spain); Russian Agency of Education {[}2.1.1/14049, 2.1.1/1535]; Russian Federal Target Program {[}02.740.11.0202, 02-740-11-5172, NK-43P(4)]; Russian Fund of Fundamental Investigations {[}10-01-96002-Ural, 10-02-96001-Ural, 10-02-00034]
Funding-Text	This work was supported by projects P08-FQM-3993 and P09-FQM-4787 (Junta de Andalucia, Spain) and FIS2009-07321 (MICINN, Spain). One of the authors (MTL-L) also acknowledges financial support by the University of Granada (Spain). AZ and DC have been supported by the Russian Agency of Education, projects 2.1.1/14049 and 2.1.1/1535, grants of the Russian Federal Target Program 02.740.11.0202, nos 02-740-11-5172 and NK-43P(4), grants of the Russian Fund of Fundamental Investigations 10-01-96002-Ural, 10-02-96001-Ural, 10-02-00034.
Number-of-Cited-References	50
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	59
Journal-ISO	J. Phys.-Condes. Matter
Doc-Delivery-Number	845AH