Abstract
We fabricate a hybrid magnetorheological elastomer (hMRE) based on a microfiber cloth soaked with a mixture containing magnetorheological suspension (MRS) and silicone rubber (SR). Two parallel copper electrodes are attached to the hMRE and the capacitance C is measured as a function of time t, for fixed values of magnetic flux density B. We show that C is stable in time and is sensibly influenced by B, while the relative dielectric permittivity increases up to two orders of magnitude when B reaches 340 mT. We explain the physical mechanism which leads to the observed magnetodielectric effects. The obtained results can be used for various biomedical applications such as in fabrication of active biomagnetic membranes used in dental implantology.
Highlights
Magnetorheological elastomers (MRE) together with magnetorheological suspensions (MRS) and gels (MRG) belong to the class of active magnetic materials
The hybrid magnetorheological elastomer (hMRE) is introduced between the dipoles of the electromagnet, and by using an RLC bridge the electrical capacitance is measured as a function of time t, with and without an external magnetic field
At B = 340 mT, the average capacitance is about 4.2 nF, and magnetodielectric effects are induced inside hMRE
Summary
Magnetorheological elastomers (MRE) together with magnetorheological suspensions (MRS) and gels (MRG) belong to the class of active magnetic materials. In a magnetic field the elasticity state and electrical properties of MRE can be sensibly changed due to formation of aggregates inside the elastic matrix. In [18] a high stability of electrical properties during application of an external magnetic field has been reported It is well-known that MRS are successfully used in fabrication of dynamic prostheses in oral surgery [13], since it increases the positioning precision of implants [19] and it isolates the patient’s bone from the oral cavity [20, 21]
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