Fe3O4/sepiolite magnetic composite particles and their magneto- responsive characteristics

To prepare a new magnetorheological (MR) material of magnetite/clay composite-based MR material and test its rheological characteristics, Fe 3 O 4 /sepiolite clay nanocomposite particles were fabricated by loading Fe 3 O 4 particles on the surface of sepiolite using an in situ chemical co-precipitat...

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Bibliographic Details
Published in:Colloid and polymer science 2018, Vol.296 (1), p.11-19
Main Authors: Dong, Yu Zhen, Piao, Shang Hao, Choi, Hyoung Jin
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical precipitation
Chemistry
Chemistry and Materials Science
Clay minerals
Complex Fluids and Microfluidics
Electron microscopy
Field strength
Fluid dynamics
Food Science
Iron oxides
Magnetic fields
Magnetic measurement
Magnetorheological fluids
Microscopy
Nanocomposites
Nanotechnology and Microengineering
Original Contribution
Particulate composites
Physical Chemistry
Polymer Sciences
Rheological properties
Rheology
Sepiolite
Shear viscosity
Soft and Granular Matter
Yield strength
Yield stress
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Summary:To prepare a new magnetorheological (MR) material of magnetite/clay composite-based MR material and test its rheological characteristics, Fe 3 O 4 /sepiolite clay nanocomposite particles were fabricated by loading Fe 3 O 4 particles on the surface of sepiolite using an in situ chemical co-precipitation method, and their MR characteristics under applied magnetic fields were examined. Scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, and X-ray diffraction confirmed successful composite formation. Vibrating sample magnetometry also revealed their typical superparamagnetic behavior. The synthesized composites were dispersed in mineral oil to form a MR fluid with a particle concentration of 10 vol%. Various magneto-rheological tests of the MR fluids were attempted at different magnetic field strengths, including flow curve and dynamic oscillation test. While shear viscosity, yield stress, and dynamic modulus increased with magnetic field strengths, the yield stress as a function of magnetic field strength demonstrated a slope of 1.0 on a log–log scale.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-017-4221-7