Abstract
The paper has modified a magnetorheological elastomer (MRE), a sensitive component of a sensing device, by adding conductive particles of multi-wall carbon nanotubes (MWCNTs), to increase conductivity and reduce response time. After adding MWCNTs, the magnetoresistance calculation model is established based on the theories of effective medium and percolation. Also, MRE with different ratios of carbon nanotubes and carbonyl iron powder are prepared, and the test system for magnetoresistance is built. The test results show that when the ratio is 2:3, the resistivity reaches a minimum while the response time is the shortest. For the same 2:3 ratio and different conductive particle volume fractions, the relationship between electric resistance and magnetic induction is tested. The results show that the resistance decreases with the increase of the applied magnetic field strength, and the larger the volume fraction of the conductive particles, the more obvious the resistance drop. The resistance value as a function of applied magnetic field is predicted well by our model, which provides a new method for the calculation of the resistance value of MRE.
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