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

Corey Breznak, Paris R. Von Lockette

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)972-981
Number of pages10
JournalJournal of Materials Research
Volume34
Issue number6
DOIs
StatePublished - Mar 28 2019

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Elastomers
elastomers
Barium
barium
Magnetization
Remanence
Composite materials
Polydimethylsiloxane
Distribution functions
Volume fraction
magnetization
composite materials
barium hexaferrite
remanence
Experiments
magnetic measurement
mesh
confidence
Direction compound
distribution functions

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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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.",
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Particle orientation and bulk properties of magnetoactive elastomers fabricated with aligned barium hexaferrite. / Breznak, Corey; Von Lockette, Paris R.

In: Journal of Materials Research, Vol. 34, No. 6, 28.03.2019, p. 972-981.

Research output: Contribution to journalArticle

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