Abstract

Magnetorheological fluids are made of magnetic particles dispersed in some carrier fluid. Their rheology can be strongly modified by the application of a magnetic field. In a similar way, a magnetic elastomer is obtained by mixing these magnetic particles inside some polymer before curing. If, before curing, the particles have been aligned with the help of a magnetic field, then the viscoelatic properties of the material can be changed to a large extent in the presence of a magnetic field. A third type of material can be realized with the same particles by taking a liquid crystal for the matrix. In these three cases these are the magnetic interactions that allow controlling the response of the material. We present some results obtained with the magnetic elastomers together with an interpretation based on a calculation of forces between the particles. We show that the magnetostriction remains very low in elastomer whereas it could reach 20 % in nematic elastomers containing iron particles

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