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Soft Matter. 2015 Sep 14;11(34):6893-902. doi: 10.1039/c5sm00984g. Epub 2015 Aug 3.

Magnetic field dependent electro-conductivity of the graphite doped magnetorheological plastomers.

Author information

1
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230027, P. R. China. gongxl@ustc.edu.cn xuansh@ustc.edu.cn.

Abstract

In this work we reported a novel graphite doped conductive magnetorheological plastomer (GMRP) with magnetic field dependent electro-conductivity. The conductivity of the GMRPs increased by increasing the content of the graphite particles, while it decreased with the graphite size. When the graphite content reached 15 wt%, the conductivity of GMRPs is approximately 10‚ÄČ000 times higher than the non-doped MRP. Because the iron particles in the GMRPs were magnetic, the conductivity of the GMRPs was magnetically sensitive. Upon applying a 780 mT magnetic field, the electric conductivity could increase about 1000 times larger than the one under zero magnetic field. A particle-particle resistance model was developed to investigate the influence of the magnetic field and graphite doping on the conductivity, and the fitting curve matched the experimental results very well. Finally, a magnetically controllable on-off switch based on GMRPs was proposed and its working mechanism was discussed.

PMID:
26235530
DOI:
10.1039/c5sm00984g

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