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Title: Preparation and tests of MR fluids with CI particles coated with MWNTS
Authors: Guo, YQ
Sun, CL
Xu, ZD
Jing, X 
Keywords: Coating effect
Magnetorheological fluids
Property tests
The carbonyl iron particles
The multi-walled carbon nanotubes
Issue Date: 2018
Publisher: Frontiers Research Foundation
Source: Frontiers in materials, 2018, v. 5, 50 How to cite?
Journal: Frontiers in materials 
Abstract: The magnetorheological (MR) fluid is a typical smart material, whose shear yield stress can be adjusted through changing the strength of external magnetic field, and the changing process only takes a few milliseconds. The MR fluid is composed of micro/nanometer ferromagnetic particles, carrier fluids, and some additives. Among them, the performance of ferromagnetic particles will mainly affect the sedimentation stability and the magnetic saturation of the MR fluid. Therefore, the ferromagnetic particles are expected to have characteristics of both low density and high magnetism. In this paper, the multi-walled carbon nanotubes (MWNTs) were adopted to coat on the carbonyl iron (CI) particles with grafting technology using ultrasonication and mechanical stirring. The coated CI particles with perfect core-shell structure were developed and the influence of the dosages of grafting agent and MWNTs were tested. And then, MR fluids with CI particles coated with MWNTs were established and the coating effect was studied through surface topography particle density, and magnetic properties of composite magnetic particles and stability tests of the prepared MR fluids. The results showed that although the magnetic saturation of the prepared MR fluids with CI particles coated with MWNTs would reduce slightly, the particles density and the adsorption force between the particles were decreased effectively, which are both advantageous to the improvement of the sedimentation stability of MR fluids.
EISSN: 2296-8016
DOI: 10.3389/fmats.2018.00050
Rights: Copyright © 2018 Guo, Sun, Xu and Jing. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
The following publication Guo, Y. Q., Sun, C. L., & Xu, Z. D. (2018). Preparation and tests of MR Fluids with CI particles coated with MWNTs. Frontiers in Materials, 5, 50 is available at
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