Carbon Nanotubes Modified Oil-based Nanofluids: Electrical Conduction Mechanism Analysis

2024/01/25 by Barnoss, Sanae, El Fengouchi, Ikrame, Graca, Manuel Pedro Fernanades +2
#Carbon nanotubes #Electrical conductivity #Jonscher power law. #Nanofluids

paper · doi:10.48317/imist.prsm/morjchem-v12i2.41862

Abstract

This paper reports research on the electrical conduction mechanisms of nanofluids, formed by adding carbon nanotube (CNT) and 0.5 wt% of graphite (Gt) particles to engine oil, in the range of temperatures up to 400 K. An analysis of the dc conductivity of nanofluids versus CNT concentration and temperature, have shown a percolation threshold of 0.6 wt% and revealed the PTCR (Positive Temperature Coefficient of Resistivity) effect for temperatures below the critical value Tc≈350 K and concentrations above the critical percolation threshold. The ac conductivity of all samples was fitted in the range of frequency from 100 Hz to 1 MHz using the Jonscher power law, which allows for the specification of the appropriate electrical conduction mechanism using the exponent s in that law.

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