Magnetorheology of synthesized core-shell structured nanoparticle

Author

Choi, H.J. ; Jang, I.B. ; Lee, J.Y. ; Pich, A. ; Bhattacharya, S. ; Alder, H.J.

Author_Institution

Dept. of Polymer Sci. & Eng., Inha Univ., Incheon, South Korea

fYear

2005

fDate

4-8 April 2005

Firstpage

1549

Lastpage

1550

Abstract

The composite particles with polymeric core particles covered by Fe₃O₄ (magnetite) shell were synthesized in order not only to reduce the density of the particle but also to extend its applicability into biological system using magnetic nanoparticles. The magnetorheological (MR) characteristics of the composite suspension were investigated. The MR fluid exhibited the Bingham plastic behavior with a yield stress under an applied magnetic field. Without an applied magnetic field strength, the MR suspension showed a non-Newtonian fluid behavior with a slope of 0.7, compared to a typical Newtonian fluid behavior with a slope of 1.0. The shear thinning behavior of MR fluid under applied magnetic fields showed that the shear viscosity decreases with a shear rate similar to shear thinning of polymer melts or solutions.

Keywords

ferromagnetic materials; iron compounds; magnetic particles; magnetorheology; nanoparticles; non-Newtonian fluids; suspensions; viscosity; yield stress; Bingham plastic behavior; Fe₃O₄; composite particles; core-shell structured nanoparticle; magnetic nanoparticles; magnetite; magnetorheology; nonNewtonian fluid behavior; polymeric core particles; shear thinning; shear viscosity; suspension; yield stress; Biological systems; Iron; Magnetic cores; Magnetic fields; Magnetic levitation; Magnetic liquids; Nanobioscience; Nanoparticles; Plastics; Polymers;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1464207

Filename

1464207