Synthesis, characterization and studies on magneto-viscous properties of magnetite dispersed water based nanofluids

Magnetic nanofluids, commonly known as ferrofluids, containing surfactant coated magnetite nanoparticles (having mean size ∼11nm) uniformly dispersed in water are synthesized by chemical co-precipitation method. The rheological properties of magnetic nanofluid at different concentrations of nanopart...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2016-04, Vol.404, p.29-39
Main Authors: Paul, Gayatri, Kumar Das, Prasanta, Manna, Indranil
Format: Article
Language:English
Subjects:
Chain aggregates
Coprecipitation
Magnetic Field
Magnetic fields
Magnetic properties
Magnetite
Mathematical models
Nanofluid
Nanofluids
Nanoparticles
Rheology
Stress concentration
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Summary:Magnetic nanofluids, commonly known as ferrofluids, containing surfactant coated magnetite nanoparticles (having mean size ∼11nm) uniformly dispersed in water are synthesized by chemical co-precipitation method. The rheological properties of magnetic nanofluid at different concentrations of nanoparticle loading have been investigated by varying different parameters including the magnetic field strength. Shear thinning is observed in the non-Newtonian magnetic nanofluids under the application of magnetic field. The observed increase in yield stress (calculated by fitting the Herschel and Bulkley model) with the applied magnetic field and concentration of dispersed nanoparticles confirm the formation of large aggregates that restrict or prohibit the flow characteristics of the otherwise Newtonian magnetic nanofluid. The hysteresis observed during the application and withdrawal of magnetic field suggests that the chain or column like structures fail to relax within the allowed measurement time interval. •Magnetite dispersed water nanofluids are prepared by chemical precipitation method.•Effect of shear and magnetic field on the viscosity of nanofluids are investigated.•Applied field enhances the viscosity by several times and causes shear thinning.•Chain-like or columnar aggregates of nanoparticles formed increases the viscosity.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2015.11.085