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Journal of Intelligent Material Systems and Structures
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Article

Magnetorheology of Single-walled Carbon Nanotube Dispersions in Mineral Oil

Zhengtao Yang1, Jeffrey Bahr2, and Nandika Anne D'Souza1*

1 Department of Materials Science and Engineering, University of North Texas P.O. Box 305310, Denton, TX 76207, USA
2 Carbon Nanotechnologies Inc., 16200 Park Row, Houston, TX 77084, USA

* To whom correspondence should be addressed.


  Abstract

The magnetorheological properties of single-walled carbon nanotube (SWNT)/mineral oil (MO) dispersions are studied using a parallel plate rheometer. Nanotubes of 1.24, 2.5, and 6.41 vol% are dispersed in mineral oil. Strain sweeps, frequency sweeps, magnetosweeps, and steady shear tests are conducted under various magnetic fields. Storage modulus G', loss modulus G'', complex viscosity {eta}*, and dynamic yield stress {tau}y increase with increase in magnetic field, which is partially attributed to the increasing degree of the alignment of nanotubes in a stronger magnetic field. The alignment of nanotubes is significantly restricted at a high nanotube concentration of 6.41 vol% due to the formation of a flocculated system. Increase in magnetic field increases the elastic properties of the dispersion, decreases the viscoelastic response, and delays the non-Newtonian behavior and transition from solid to liquid state. {tau}y, G', and G'' of SWNT/mo dispersions scale with magnetic flux density by a power law similar to magnetorheological fluids (MRFs). The shear thinning behavior of SWNT/mo dispersions follows the Ostwald-de Waele or power law. SWNT/mo of 2.5 vol% shows the largest percent increase in G', G'', {eta}* among the three concentrations of dispersions during magnetosweeps.

Key Words: magnetorheology, carbon nanotubes, SWNT, MR.

First published on December 21, 2007, doi:10.1177/1045389X07083611

Journal of Intelligent Material Systems and Structures 2008;19:1143.

A more recent version of this article appeared on October 1, 2008

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