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Journal of Nanomaterials
Volume 2017, Article ID 9026219, 8 pages
https://doi.org/10.1155/2017/9026219
Research Article

Magnetic Nanoparticles as a Redispersing Additive in Magnetorheological Fluid

1La Salle University, Mexico City, Mexico
2Department of Applied Physics, School of Science, University of Granada, 18071 Granada, Spain

Correspondence should be addressed to G. R. Iglesias; se.rgu@saiselgi

Received 29 January 2017; Accepted 18 April 2017; Published 30 May 2017

Academic Editor: Zehra Durmus

Copyright © 2017 M. Aguilera Portillo and G. R. Iglesias. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Unwanted agglomeration of micro particles in magnetorheological fluid is an important problem for many technological applications. Furthermore, the stability of this kind of fluid is also studied as an important property in many research papers. Prior to use, a redispersion of agglomerated or aggregated (connected by solid phase) particles is often necessary. The objective of this study is to evaluate the dispersibility effect of magnetic nanoparticles as a carrier, while keeping the magnetorheological (MR) effect as high as possible. A simple device based on the estimation of the penetration force of a standard needle is presented. The needle moves across the sample vertically with a constant velocity and it is attached to a scale which registers the force displaced by the needle during the dynamic test. The effect with and without other additives was also studied. Transmission electron microscopy (TEM) and Scanning Electron Microscopy (SEM) reveal a protective behavior of nanoparticles around the micro particles. We conclude that addition of magnetic nanoparticles improves the dispersibility characteristic compared with common dispersing additives without affecting the MR effect.