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Electrical Conductivity and Dielectric Properties of Ethylene Glycol-Based Nanofluids Containing Silicon Oxide–Lignin Hybrid Particles

1
Department of Physics and Medical Engineering, Rzeszów University of Technology, 35-959 Rzeszów, Poland
2
Department of Mechanical Engineering, Rzeszów University of Technology, 35-959 Rzeszów, Poland
3
Department of Polymer Composites, Rzeszów University of Technology, 35-959 Rzeszów, Poland
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 1008; https://doi.org/10.3390/nano9071008
Received: 13 June 2019 / Revised: 8 July 2019 / Accepted: 10 July 2019 / Published: 12 July 2019
(This article belongs to the Special Issue Future and Prospects in Nanofluids Research)
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Abstract

This paper presents results of experimental investigation into dielectric properties of silicon oxide lignin (SiO2-L) particles dispersed with various mass fractions in ethylene glycol (EG). Measurements were conducted at a controlled temperature, which was changed from 298.15 to 333.15 K with an accuracy of 0.5 and 0.2 K for dielectric properties and direct current (DC) electrical conductivity, respectively. Dielectric properties were measured with a broadband dielectric spectroscopy device in a frequency range from 0.1 to 1 MHz, while DC conductivity was investigated using a conductivity meter MultiLine 3410 working with LR925/01 conductivity probe. Obtained results indicate that addition of even a small amount of SiO2-L nanoparticles to ethylene glycol cause a significant increase in permittivity and alternating current (AC) conductivity as well as DC conductivity, while relaxation time decrease. Additionally, both measurement methods of electrical conductivity are in good agreement. View Full-Text
Keywords: silica; silicon oxide; lignin; nanofluids; nanoparticles; electrical properties silica; silicon oxide; lignin; nanofluids; nanoparticles; electrical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fal, J.; Wanic, M.; Budzik, G.; Oleksy, M.; Żyła, G. Electrical Conductivity and Dielectric Properties of Ethylene Glycol-Based Nanofluids Containing Silicon Oxide–Lignin Hybrid Particles. Nanomaterials 2019, 9, 1008.

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