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Miniemulsion fabricated Fe3O4/poly(methyl methacrylate) composite particles and their magnetorheological characteristics

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4 Author(s)
Park, B.O. ; Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea ; Song, K.H. ; Park, B.J. ; Choi, H.J.

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In order to improve drawbacks such as sedimentation of magnetic particles and abrasion of the magnetorheological (MR) fluid, we have fabricated Fe3O4/poly(methyl methacrylate) (PMMA) composite particles via a double miniemulsion method and studied their MR properties. Morphology and chemical composition of the synthesized Fe3O4/PMMA composite particles were investigated by transmission electron microscopy and Fourier transform infrared, respectively. The density of the Fe3O4/PMMA composite particles was measured to be lower than that of the as-synthesized Fe3O4 particles, indicative of an improvement of the composite particles to stay dispersed. Rheological characteristics of the Fe3O4/PMMA based MR fluid dispersed in a nonmagnetic carrier fluid were measured by both static and dynamic tests using a rotational rheometer under an external magnetic field. Shear stress, yield stress, and storage modulus from the rheological measurements were obtained to be increased with applied magnetic field strengths.

Published in:

Journal of Applied Physics  (Volume:107 ,  Issue: 9 )

Date of Publication:

May 2010

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