Title :
Magnetorheology of synthesized core-shell structured nanoparticle
Author :
Choi, H.J. ; Jang, I.B. ; Lee, J.Y. ; Pich, A. ; Bhattacharya, S. ; Adler, H.-J.
Author_Institution :
Dept. of Polymer Sci. & Eng., Inha Univ., Incheon, South Korea
Abstract :
Nanosized magnetic composite particles with polystyrene-acetoacetoxyethyl methacrylate (PS-AAEM) core and magnetite shell were prepared by controlled precipitation of inorganic precursors onto the core particles. This composite was adopted as a dispersed phase of magnetorheological (MR) fluids. Flow properties of shear stress and shear viscosity of the MR fluids were analyzed via a rotational rheometer equipped with a magnetic field supplier in parallel plate geometry, and it was found that this magnetic-composite-particle-based MR fluid exhibited typical MR characteristics, by showing not only a Bingham fluid behavior with a yield stress but also the increase of shear stress as a function of an applied magnetic field strength.
Keywords :
magnetic particles; magnetorheology; nanocomposites; nanoparticles; non-Newtonian fluids; Bingham fluid; controlled precipitation; core shell structured nanoparticle; flow property; inorganic precursors; magnetic nanocomposite particles; magnetite shell; magnetorheology; shear stress; shear viscosity; Iron; Magnetic cores; Magnetic fields; Magnetic liquids; Magnetic materials; Magnetic properties; Polymers; Saturation magnetization; Soft magnetic materials; Stress; Core–shell; magnetic composite; magnetorheological (MR) fluid;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.855197