Abstract
Cobalt particles have been introduced as a filler due to the advantages of embedding their magnetic and electrical properties in magnetorheological elastomer (MRE). In the present research, the rheology and resistance of MRE are experimentally evaluated. Isotropic and anisotropic MRE samples containing silicone rubber and cobalt particles were fabricated. The magnetic properties of MRE are conducted using a vibrating sample magnetometer (VSM). The morphological aspects of MRE are observed by using field emission scanning electron microscopy (FESEM) and characterized by energy-dispersive X-ray spectroscopy (EDX). Rheological properties under various magnetic field strengths were measured for the magnetic field, strain amplitude, and frequency sweep test by using a parallel-plate rheometer. Subsequently, the resistance of MRE is tested under different applied forces and magnetic fields. The MRE storage modulus depicted an enhancement in field-dependent modulus across all the applied magnetic fields. The electrical resistance generated from the sample can be manipulated by external magnetic fields and mechanical loads. The conductivity of MRE is due to the existence of cobalt arrangements observed by FESEM. By introducing cobalt as filler and obtaining satisfactory results, the study might open new avenues for cobalt to be used as filler in MRE fabrication for future sensing applications.
Highlights
Nowadays magnetorheological elastomer (MRE) has attracted much attention since, in addition to its magnetic and rheological properties, it presents uncommon electrical properties leading to various engineering applications, for example, vibration absorbers [1,2,3], electromagnetic waves absorbers [4], dampers [5,6], and sensors [7,8]
Cobalt-based MRE using silicon rubber was successfully fabricated in isotropic and anisotropic types
Element characterization, and magnetic properties, the relationship between rheological properties and magnetic field, the resistance, and magnetic field were experimentally investigated and discussed in detail. Their microstructure was observed by field emission scanning electron microscopy (FESEM) and mapping analysis showing, the cobalt chain in an anisotropic state
Summary
Nowadays magnetorheological elastomer (MRE) has attracted much attention since, in addition to its magnetic and rheological properties, it presents uncommon electrical properties leading to various engineering applications, for example, vibration absorbers [1,2,3], electromagnetic waves absorbers [4], dampers [5,6], and sensors [7,8]. To the best of our knowledge, no study has been conducted on the resistance properties of cobalt-based MRE, which detailed the resistance properties of the MRE toward the presence of external magnetic field; this area is still lacking and interesting to be investigated. This would include investigating the impacts of magnetic field strength on the cobalt-based MRE under strain amplitude, frequency, and current sweep of testing parameters. In this study, investigation of the response of cobalt as magnetic particles toward the rheological and resistance properties for isotropic and anisotropic MRE was comprehensively examined
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