N-Like rheograms of suspensions of magnetic nanofibers / Zubarev Andrey,Lopez-Lopez Modesto T.,Iskakova Larisa,Gonzalez-Caballero Fernando // SOFT MATTER. - 2013. - V. 9, l. 6. - P. 1902-1907.

ISSN/EISSN:

1744-683X / нет данных

Type:

Article

Abstract:

Rheograms of suspensions of single-domain magnetic nanofibers in the presence of an applied magnetic field display an N-like shape. Namely, the shear stress initially increases with the shear rate, reaching a maximum at values of the shear rate of the order of 10 s(-1), then decreases to a minimum and, finally, increases monotonically as the shear rate is further increased. In this paper we present a theoretical model that explains this shape of the rheograms from a microscopical viewpoint. Our model considers that two types of nanofiber aggregates of ellipsoidal shape are built upon magnetic field application, depending on the strength of solid friction between nanofibers in each type of aggregate. In the first type of aggregate, interfiber friction is not very strong and nanofibers could reorganize as the aggregate is tilted by the shear flow, giving rise to a ``paramagnetic{''} aggregate with changeable magnetization. In the second type of aggregate, interfiber friction is so strong that nanofiber orientations are fixed and, thus, the magnitude and direction (along the aggregate main axis) of the magnetization of the aggregate are fixed too. This model is a simplification of the real situation in which a more or less continuous distribution of the aggregates over the friction forces is expected. In spite of this simplification, the predictions of our model agree qualitatively and quantitatively with experimental results.

Author keywords:

FIBER SUSPENSIONS; ELECTRORHEOLOGICAL FLUIDS; WHISKER SUSPENSIONS; PARTICLES; MAGNETORHEOLOGY; RHEOLOGY; SHEAR; SHAPE; FLOW

DOI:

10.1039/c2sm27115j

Web of Science ID:

ISI:000313594200020

Соавторы в МНС:

Другие поля

Поле	Значение
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
Keywords-Plus	FIBER SUSPENSIONS; ELECTRORHEOLOGICAL FLUIDS; WHISKER SUSPENSIONS; PARTICLES; MAGNETORHEOLOGY; RHEOLOGY; SHEAR; SHAPE; FLOW
Research-Areas	Chemistry; Materials Science; Physics; Polymer Science
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Multidisciplinary; Polymer Science
Author-Email	andrey.zubarev@usu.ru
ResearcherID-Numbers	Lopez-Lopez, Modesto T/K-7327-2012 Zubarev, Adrey/B-4752-2014
ORCID-Numbers	Lopez-Lopez, Modesto T/0000-0002-9068-7795 Gonzalez Caballero, Fernando/0000-0003-4714-9243
Funding-Acknowledgement	Russian Fund of Fundamental Investigations {[}10-01-96002-Ural, 10-02-96001-Ural, 10-02-00034, 12-01-00132]; program of the Ministry of Education of the Russian Federation {[}2.1267.2011]; Junta de Andalucia, Spain {[}P08-FQM-3993, P09-FQM-4787]; MICINN, Spain {[}FIS2009-07321]; University of Granada (Accion Integrada con Rusia)
Funding-Text	This work has been supported by the Russian Fund of Fundamental Investigations, projects 10-01-96002-Ural, 10-02-96001-Ural, 10-02-00034, 12-01-00132; by the program of the Ministry of Education of the Russian Federation, project 2.1267.2011; by projects P08-FQM-3993 and P09-FQM-4787 (Junta de Andalucia, Spain), and FIS2009-07321 (MICINN, Spain); and by the University of Granada (Accion Integrada con Rusia; Plan Propio 2011).
Number-of-Cited-References	35
Usage-Count-Since-2013	16
Journal-ISO	Soft Matter
Doc-Delivery-Number	071LM