Influence of Temperature on Capacitance and Dielectric permittivity of Disc-shaped Compact fabricated from Periwinkle Shell Powder
Keywords:
Cassava starch, Conventional dielectrics, Hausner ratio, Temperature coefficient, WastesAbstract
Periwinkle shells are often generated in large quantities as waste but still remain under-utilised. Prevalently, they are heaped in open fields and landfills. Such disposal method enhances environmental pollution and breeding of disease-carrying organisms, thereby posing severe adverse effects on public health. This research aimed at devising a way to address the problems while deriving benefits from the approach. Periwinkle shells were gathered, washed, dried, and processed into powdery form which then after was blended with a wetting liquid (of viscosity 9.2 x 10-4 Pas, prepared from dry cassava starch). The blended material was utilised to produce five identical disc-shaped compacts used as test samples in this study. Capacitance of the samples was measured at frequencies of 1 kHz, 10 kHz, and 100 kHz over a temperature range of 20 OC to 70 oC. It was observed that, irrespective of the frequency considered, the samples exhibited negative temperature coefficient of capacitance. Also, the dielectric permittivity decreased as frequency increased but ranged in values (4.73 – 9.06), (2.16 – 7.02), and (1.86 – 6.33) within the adopted temperatures limits. Again, it was noticed that the samples could serve as a suitable alternative to conventional dielectrics such as paper, mica, aluminium oxide, and glass which are usually and commonly applied for capacitor manufacturing. Hence, valorisation of Periwinkle shells could serve as a scientific way of solving the associated disposal problems while availing electrical/electronic industries with low-cost, environmentally-friendly, and promising dielectric material suitable for use in capacitive energy storage devices. In the alternative, the samples could be used for electrical insulation in systems designed to operate at temperature that exceeds room value by up to 70 oC.
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