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Nanomaterials 2018, 8(9), 714; https://doi.org/10.3390/nano8090714

Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect

1
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
2
Department of Decision Sciences, School of Business, Macau University of Science and Technology, Macau 999078, China
*
Author to whom correspondence should be addressed.
Received: 14 August 2018 / Revised: 8 September 2018 / Accepted: 10 September 2018 / Published: 11 September 2018
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Abstract

The magnetorheology and dispersion stability of bidisperse magnetic particles (BMP)-based magnetorheological (MR) fluids were improved by applying a novel functional coating composed of gelatin and graphite oxide (GO) to the surfaces of the micron-sized carbonyl iron (CI) and nanoparticles Fe3O4. Gelatin acted as a grafting agent to reduce the aggregation and sedimentation of CI particles and prevent nanoparticles Fe3O4 from oxidation. In addition, a dense GO network on the surface of gelatin-coated BMP was synthesized by self-assembly to possess a better MR performance and redispersibility. The rheological properties of MR fluids containing dual-coated BMP were measured by a rotational rheometer under the presence of magnetic field and their dispersion stability was examined through sedimentation tests. The results showed that CI@Fe3O4@Gelatin@GO (CI@Fe3O4@G@GO) particles possessed enhanced MR properties and dispersion stability. In addition, the nanoparticle-enhancing effects on the dispersion stability of BMP-based MR fluids were investigated using Monte Carlo simulations. View Full-Text
Keywords: magnetorheological fluids; bidisperse magnetic particles; gelatin; graphite oxide; carbonyl iron; nanoparticles Fe3O4 magnetorheological fluids; bidisperse magnetic particles; gelatin; graphite oxide; carbonyl iron; nanoparticles Fe3O4
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Fu, Y.; Yao, J.; Zhao, H.; Zhao, G.; Wan, Z.; Qiu, Y. Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect. Nanomaterials 2018, 8, 714.

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