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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/37093

Title: Stability behaviour of composite magnetorheological fluids by an induction method
Authors: Roldán Aranda, Andrés
Reyes, Luis
Rodríguez-Arco, Laura
García López-Durán, Juan de Dios
Issue Date: 2015
Abstract: In this work we study the stability behaviour of composite magnetorheological (MR) fluids consisting of magnetic (iron) and non-magnetic (poly (methylmethacrylate), PMMA) particles dispersed in mineral oil. Because of the opacity of the suspensions, optical methods traditionally employed for evaluation of the gravitational settling in colloidal suspensions are not suitable for sedimentation follow-up in this case. For this reason, we use an alternative method based on the evaluation of the resonant frequency of the inductance of a thin coil surrounding the sample The movement of the coil along the height of the container at specified steps and time intervals allows obtaining information about the local volume fraction of particles inside the tube. The obtained successive profiles for the multi-component suspensions show a decrease of the iron particle settling and of the initial rate of settling as the PMMA volume fraction is increased. Finally, the increase of the PMMA concentration gives rise to an improvement of the rheological properties upon magnetic field application for a given concentration of iron. Both a strongrheological response and a good colloidal stability are essential for practical applications.
Sponsorship: Proyectos PE2012-FQM694 (Junta de Andalucía, Spain)y FIS2013-47666-C3-1-R (Ministerio de Economía y Competitividad, Spain). L. R.-A. agrradece a la Universidad de Granada su contrato puente (Plan Propio de Investigación, UGR).
Publisher: Sage Journals
Description: Este artículo puede consultarse en la siguiente dirección de la editorial: http://jim.sagepub.com/content/early/2015/03/26/1045389X15577656.full.pdf+html
Keywords: Stability
Sedimentation profile
Magnetic particles
Multicomponent magnetic suspensions
Non-magnetic particles
Magnetorheological fluids
URI: http://hdl.handle.net/10481/37093
ISSN: 1045-389X
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Iglesias, G.R.; et al. Stability behaviour of composite magnetorheological fluids by an induction method. Journal of Intelligent Material Systems and Structures, on line (2015). [http://hdl.handle.net/10481/37093]
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