Volume 22
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Liu, J., Wang, X., Tang, X., Hong, R., Wang, Y., & Feng, W. (2015). Preparation and characterization of carbonyl iron/strontium hexaferrite magnetorheological fluids. Particuology, 22, 134-144. https://doi.org/10.1016/j.partic.2014.04.021
Preparation and characterization of carbonyl iron/strontium hexaferrite magnetorheological fluids
Jianrong Liu a b, Xianjun Wang b, Xia Tang a, Ruoyu Hong a b c *, Yaqiong Wang c, Wenguo Feng d
a College of Chemistry, Chemical Engineering and Materials Science & Jiangsu Provincial Key Laboratory of Organic Synthesis, Soochow University, Suzhou 215123, China
b School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China
c Jiangsu Provincial Key Laboratory of Environmental Materials and Engineering, Yangzhou University, Yangzhou 225002, China
d Suzhou Nanocomp Inc., Suzhou New District, Suzhou 215011, China
10.1016/j.partic.2014.04.021
Volume 22, October 2015, Pages 134-144
Received 17 December 2013, Revised 3 April 2014, Accepted 13 April 2014, Available online 15 November 2014, Version of Record 4 August 2015.
E-mail: rhong@suda.edu.cn

Highlights

• Carbonyl iron/strontium hexaferrite (SrFe12O19) magnetorheological fluids (MRFs) were prepared.

• Stability of carbonyl iron-based MRFs was improved remarkably by adding SrFe12O19 nanoparticles.

• MRF's shear stress could be predicted using improved Herschel–Bulkley model.

• A theoretical model was proposed to predict MRF's yield stress under an applied magnetic field.


Abstract

The heat transfer oil-based magnetorheological fluid (MRF) was prepared using oleic acid-modified micron carbonyl iron powder as a magnetic dispersed phase and strontium hexaferrite (SrFe12O19) nanoparticles as an additive. The sedimentation stability of MRFs was studied. The results indicated that the stability of MRFs was improved remarkably by adding SrFe12O19 nanoparticles and the sedimentation ratio was only 0.88 in 20 days when the content of nanoparticles reached 10 wt%. The rheological properties were characterized by a HAAKE rheometer without a magnetic field and a capillary rheometer with and without a magnetic field. The effects of SrFe12O19 nanoparticles, the temperature, and magnetic field strength were investigated. In addition, the rheological properties could be predicted well using the improved Herschel–Bulkley model, even under a magnetic field. A theoretical model was also proposed to predict the yield stress based on the microstructure of the MRF under an applied magnetic field.

Graphical abstract
Keywords
Strontium hexaferrite; Magnetorheological fluid; Stability; Rheological property