Particle orientation and bulk properties of magnetoactive elastomers fabricated with aligned barium hexaferrite. Issue 6 (6th February 2019)

• Record Type: Journal Article
• Authors: Breznak, Corey; von Lockette, Paris
• Is Part Of: Journal of materials research. Volume 34:Issue 6(2019)
• Page Start: 972
• Page End: 981
• Publication Date: 2019-02-06
• Subjects: magnetic, -- magnetic properties, -- particulate; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2018.496
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: 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.