Fabrication and viscoelastic properties of PVC coated magnetite agglomerates in magneto-rheological suspension

Injamamul Arief - P. K. Mukhopadhyay

LCMP, Department of Condensed Matter Physics and Material Sciences S.N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700 098, India

Abstract
The present work reports the synthesis of polyvinylchloride encapsulated superparamagnetic magnetite micro-agglomerates. These were characterized with scanning as well as transmission electron micrographs, and X-ray diffraction. Magneto-rheological fluids were pro\-duċed by dispersing these particles in various concentrations in castor oil, which is the carrier fluid here. The viscoelastic characterization of these fluids were made at room temperature, under different shear rates, both with and without magnetic field. The behaviour of the fluids was modelled as a Herschel--Bulkley fluid. Overall, these fluids have been found to have desirable and usable properties. Tables 2, Figs 3, Refs 6.