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Core–shell-structured silica-coated magnetic carbonyl iron microbead and its magnetorheology with anti-acidic characteristics

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Abstract

We synthesized silica-coated soft magnetic carbonyl iron (CI) particles through a modified Stöber method, in which the CI particles were pretreated with a grafting agent to enhance the affinity of a precursor of silica. Synthesized magnetic microbeads were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, and anti-acid test in HCl solution. Silica-coated CI shows not only improved wettability to silicone oil with a lower off-state shear viscosity as a better magnetorheological fluid under an applied magnetic field but also enhanced anti-acidic property.

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Acknowledgments

This work was supported by Ministry of Knowledge Economy, Korea and Kolon (2010)

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Inha University, Incheon, 402–751, South Korea

    Ying Dan Liu, Fei Fei Fang & Hyoung Jin Choi

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  1. Ying Dan Liu
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  2. Fei Fei Fang
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  3. Hyoung Jin Choi
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Correspondence to Hyoung Jin Choi.

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Liu, Y.D., Fang, F.F. & Choi, H.J. Core–shell-structured silica-coated magnetic carbonyl iron microbead and its magnetorheology with anti-acidic characteristics. Colloid Polym Sci 289, 1295–1298 (2011). https://doi.org/10.1007/s00396-011-2452-6

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  • DOI: https://doi.org/10.1007/s00396-011-2452-6

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