title: Ultrastable Natural Ester-Based Nanofluids for High Voltage Insulation Applications.
abstract: Nanofluids for high voltage insulation systems have emerged as a potential substitute for liquid dielectrics in industrial applications. Nevertheless, the sedimentation of nanoparticles has been so far a serious barrier for their wide and effective exploitation. The present work reports on the development and in-depth characterization of colloidally ultrastable natural ester oil insulation systems containing iron oxide nanocrystals which lift the problem of sedimentation and phase separation. Compared to state-of-the-art systems, the final product is endowed with increased dielectric strength, faster thermal response, lower dielectric losses (decreased dissipation factor: tan δ), and very high endurance during discharge stressing. The developed nanofluid was studied and compared with a similar system containing commercial iron oxide nanoparticles, the latter demonstrating extensive sedimentation. Herein, the dielectric properties of the nanofluids are analyzed at various concentrations by means of breakdown voltage and dissipation factor measurements. The characterization techniques unequivocally demonstrate the high performance reliability of the reported nanofluid, which constitutes a significant breakthrough in the field of high voltage insulation technologies.
authors: Department of Electrical and Computer Engineering, University of Patras , 26504 Rio, Greece.
authors: Georgios D
authors: GD
authors: Peppas
authors: Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.
authors: Aristides
authors: A
authors: Bakandritsos
authors: Department of Electrical Engineering Technological Educational Institute of Western Greece , Patras, Greece.
authors: Vasilis P
authors: VP
authors: Charalampakos
authors: Department of Electrical and Computer Engineering, University of Patras , 26504 Rio, Greece.
authors: Eleftheria C
authors: EC
authors: Pyrgioti
authors: Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.
authors: Jiri
authors: J
authors: Tucek
authors: Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University in Olomouc , 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.
authors: Radek
authors: R
authors: Zboril
authors: School of Electrical and Computer Engineering, National Technical University of Athens , Athens, Greece.
authors: Ioannis F
authors: IF
authors: Gonos
keywords: colloids; dielectrics; insulation systems; nanocrystals; nanofluids