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Particle orientation and bulk properties of magnetoactive elastomers fabricated with aligned barium hexaferrite

Published online by Cambridge University Press:  06 February 2019

Corey Breznak Open the ORCID record for Corey Breznak [Opens in a new window]  and
Paris von Lockette
Corey Breznak*
Affiliation:
Department of Mechanical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
Paris von Lockette
Affiliation:
Department of Mechanical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

This work studied the relationship between embedded particle volume fraction and magnetic particle orientation distribution in aligned 325 mesh barium hexaferrite (BHF) and polydimethylsiloxane (Sylgard 184; Dow Corning) magnetoactive elastomer (MAE) composites. BHF particles were aligned within the elastomer in the out-of-plane direction, as the material cured. Particle orientation distribution was defined herein by observations of the population of directions at which particle magnetizations resided; magnetization coincides with the physical crystallographic c-axis of BHF. The work used results of vibrating sample magnetometry experiments on MAEs with increasing volume concentrations of embedded ferromagnetic particles (10–30 v/v%) to determine changing widths of analytical particle distribution functions used to describe the range of particle orientations. With over 80% confidence, results showed that MAE composites having the intermediate 15 v/v% had the highest degree of magnetic (and thereby physical) alignment as well as magnetic remanence.

Keywords

magneticmagnetic propertiesparticulate
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 6 , 28 March 2019 , pp. 972 - 981
Copyright
Copyright © Materials Research Society 2019 

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