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Core-shell structured Fe3O4@SiO2 nanoparticles fabricated by sol–gel method and their magnetorheology

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Abstract

Using a sol–gel method, silica-coated magnetite (Fe3O4 @SiO2) core-shell nanoparticles were fabricated following a two-step process. In the first step, the Fe3O4 nanoparticles were prepared via a solvothermal method. In the second step, the Fe3O4 nanoparticles were coated with SiO2 formed through the hydrolyzation of tetraethyl orthosilicate. The structure and properties of the core-shell Fe3O4 @SiO2 nanoparticles were characterized and the results showed that Fe3O4 @SiO2 nanoparticles are a soft magnetic material. A magnetorheological (MR) suspension was prepared based on the synthesized Fe3O4 @SiO2 nanoparticles dispersed in silicone oil and measured using a rotational rheometer at various magnetic field strengths. Using a rotational rheometer, the MR properties of the Fe3O4 @SiO2 in silicone oil, including shear stress, shear viscosity, and yield stress were examined under an applied magnetic field.

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Acknowledgments

This work was financially supported by Ministry of Trade, Industry and Energy, Korea (no. 10047791).

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

    Hyun Sik Chae, Sang Deuk Kim, Shang Hao Piao & Hyoung Jin Choi

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  1. Hyun Sik Chae
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Correspondence to Hyoung Jin Choi.

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Chae, H.S., Kim, S.D., Piao, S.H. et al. Core-shell structured Fe3O4@SiO2 nanoparticles fabricated by sol–gel method and their magnetorheology. Colloid Polym Sci 294, 647–655 (2016). https://doi.org/10.1007/s00396-015-3818-y

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  • DOI: https://doi.org/10.1007/s00396-015-3818-y

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