Browsing by Author "Manohar Shankar, B.S.M."

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    Effect of fillers on the piezocapacitive behaviour of silicone rubber particulate composites
    (Institute of Physics, 2024) Manohar Shankar, B.S.M.; Kulkarni, S.M.
    Robotics and fluid dynamics applications have created demand for development of electronic skins with embedded pressure sensors. These applications require simple and low-cost fabrication processes with large area deployment. Both structured and unstructured material approaches to sensor development have been followed. Among the various sensing mechanisms, piezo capacitive transduction is superior. This paper reports the influence of fillers on the piezo capacitive characteristics of unstructured solid silicone rubber composites. Dielectric, conductive and conductive-dielectric fillers were incorporated into solid silicone rubber and fabricated using high temperature compression moulding to form dielectric-dielectric, conductive-dielectric and conductive-dielectric dielectric composites. The results reveal that piezo capacitive sensitivity varies with filler type, filler loading, curing agent loading, mixing time and curing temperature. The experiments reveal improved normalized capacitance with pressure characteristics of linearity and sensitivity of 3.9 × 10−3 (kPa)−1 in the 0-20 kPa range of pressure. These composites are thus candidate materials for flexible pressure sensing applications. © 2024 IOP Publishing Ltd
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    Investigation of piezo-capacitance and piezo-resistance properties of solid silicone rubber-conductive carbon black composites
    (American Institute of Physics Inc. subs@aip.org, 2019) Manohar Shankar, B.S.M.; Kulkarni, S.M.
    Flexible electronics have created demand for stretchable materials that can be used for various electromechanical transduction. These applications involve tactile sensing, where piezo-capacitance and piezo-resistance mechanisms are utilised for response of materials to external stimuli. The present study deals with the investigation of the above properties for solid silicone rubber-conducting carbon black composites fabricated from compression moulding process. Effect of various factors such as conductive filler and curing agent loading, mixing time and curing temperature on the response are evaluated using Taguchi analysis for achieving optimum response. The optimum piezo-capacitive and piezo-resistive sensitivities of 31.66 pF/MPa and 2.73 (MPa)-1 are achieved for factor settings of lower values of conductive filler, curing agent loading and higher values for mixing time and curing temperature. © 2018 Author(s).