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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received September 6, 2000
Accepted May 2, 2001

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Rheological Properties and Stability of Magnetorheological Fluids using Viscoelastic Medium and Nanoadditives

Jong Hyeok Park Moo Hyun Kwon¹ O Ok Park^†

Center for Advanced Functional Polymer (CAFPoly), Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Daejeon 305-701, Korea ¹Department of Chemical Engineering, Woosuk University, 490 Hujung-ri, Samrae-eup, Wanju-gun, Jeonbuk 565-701, Korea

oopark@kaist.ac.kr

Korean Journal of Chemical Engineering, September 2001, 18(5), 580-585(6), 10.1007/BF02706371

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Abstract

In order to improve the stability of magnetorheological (MR) fluids, viscoelastic medium having 2.2 Pa yield stress has been used as a continuous phase and nanosized CrO2 particles are added too. The rheological properties as well as the dispersion stability of MR fluids have been studied by using a stress-controlled rheometer and sedimentation test. The steady-shear MR response was independent of the continuous and nano additives and the fieldinduced yield stress increased subquadratically with the flux density. Since the constant stress is generated within the limit of zero shear rate, the plateau in the flow curve corresponds to the Bingham yield stress. Under an external field, the yield stress varied as B(3/2). The yield stress has an approximately linear relation with the particle volume fraction.

Keywords

Magnetorheology Yield Stress Dispersion Stability Carbonyl Iron Viscoelastic Medium

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