Force Sensing Performance of Hydrogel-based Magnetorheological Plastomers with Graphite

The higher demand for sensors and actuators devices is a result of machines and robotic devices incorporating electronics devices in its system. Intelligent material like hydrogel-based magnetorheological plastomer (HMRP) can be considered for its potential to be used in such system, particularly in a low force sensing system. However, the studies on HMRP’s potential to be used in a low force detecting system has not been further explored. In this paper, HMRP with 0 wt. % to 15 wt.% of graphite were fabricated and their resistance was tested under applied force ranging from 0 N - 5 N. The resistance was also measured in the absence and presence of magnetic field. With 15 wt.% of graphite, the resistance in the HMRP samples could reach as low as ~3000 Ω while applying load up to 5 N resulted in resistance as low as ~600 Ω in the absence of magnetic field. In the presence of 0.141 mT of magnetic field, the resistance of HRMP sample with 15 wt.% of graphite could reach as low as ~2500 Ω. The establishment of this relationship indicates that HMRP has the potential to be used in a sensing system.Clinical Relevance– This research can be used as a base to help in improving methods for physiology or therapy.