Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 21st International Symposium on High Voltage Engineering, Volume 2, ISH 2019 |
| Editors | Balint Nemeth |
| Chapter | 54 |
| Pages | 540-548 |
| Number of pages | 9 |
| Volume | 2 |
| Edition | 1. |
| ISBN (electronic) | 978-3-030-31680-8 |
| Publication status | Published - 31 Oct 2019 |
Publication series
| Name | Lecture Notes in Electrical Engineering |
|---|---|
| Volume | 599 LNEE |
| ISSN (Print) | 1876-1100 |
| ISSN (electronic) | 1876-1119 |
Abstract
This study reports on engineering of stable magnetite nanofluids for application in high voltage technology. Iron oxide (Fe 3O 4) nanoparticles were synthesized by the bottom-up approach. Nanofillers were functionalized with a surfactant and subsequently dispersed in a diluent. Nanoparticles were characterized with transmission electron microscopy (TEM), thereby the average size of 10 nm was determined for nanoparticles in concentrated solution. This colloid is diluted in synthetic ester as base liquid in two concentrations. The high stability of the colloids was confirmed with dynamic light scattering (DLS). AC breakdown voltage beside dielectric properties of the nanofluids were measured. The results show a significant improvement of the breakdown voltage strength. Magnetite nanoparticles are de facto electrically conductive, therefore addition of magnetite nanofillers gives rise to dielectric loss factor. However, magnetite nanoparticles possess much higher relative permittivity compared to the used working fluid, relative permittivity of the colloid increases slightly by infusion of the nanofillers. The thermal conductivity and dynamic viscosity were measured using a transient hot wire setup and a rotational rheometer, respectively. A moderate enhancement in thermal conductivity of the magnetite nanoparticledoped fluid was observed; being intensified with temperature increase. The dynamic viscosity of the prepared fluids remains unchanged despite infusion of the nanoparticles. However, the results turn out significant enhancement in electrical properties and moderate improvement in thermos-physical properties of the nanofluids; holistic investigations should be conducted to achieve an optimized formulation in terms of the type and concentration of the nanoparticle.
Keywords
- AC breakdown voltage, Dynamic viscosity, Magnetite nanoparticle, Nanofluid, Synthetic ester, Thermal conductivity
ASJC Scopus subject areas
- Engineering(all)
- Industrial and Manufacturing Engineering
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Proceedings of the 21st International Symposium on High Voltage Engineering, Volume 2, ISH 2019. ed. / Balint Nemeth. Vol. 2 1. ed. 2019. p. 540-548 (Lecture Notes in Electrical Engineering; Vol. 599 LNEE).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - On the Dielectrical, Electrical and Thermo-Physical Properties of Magnetite Nanoparticle-Doped Synthetic Ester
AU - Imani, Mohammad Taghi
AU - Zámbó, Daniel
AU - Miethe, Jan Frederick
AU - Werle, Peter
AU - Bigall, Nadja-Carola
N1 - Funding information: N. C. B acknowledges the financial support of the German Federal Ministry of Education and Research in the framework of “NanoMatFutur” project (03X5525) and of ERC Starting Grant “MAEROSTRUC” (714429) funded under the Horizon 2020 program.
PY - 2019/10/31
Y1 - 2019/10/31
N2 - This study reports on engineering of stable magnetite nanofluids for application in high voltage technology. Iron oxide (Fe 3O 4) nanoparticles were synthesized by the bottom-up approach. Nanofillers were functionalized with a surfactant and subsequently dispersed in a diluent. Nanoparticles were characterized with transmission electron microscopy (TEM), thereby the average size of 10 nm was determined for nanoparticles in concentrated solution. This colloid is diluted in synthetic ester as base liquid in two concentrations. The high stability of the colloids was confirmed with dynamic light scattering (DLS). AC breakdown voltage beside dielectric properties of the nanofluids were measured. The results show a significant improvement of the breakdown voltage strength. Magnetite nanoparticles are de facto electrically conductive, therefore addition of magnetite nanofillers gives rise to dielectric loss factor. However, magnetite nanoparticles possess much higher relative permittivity compared to the used working fluid, relative permittivity of the colloid increases slightly by infusion of the nanofillers. The thermal conductivity and dynamic viscosity were measured using a transient hot wire setup and a rotational rheometer, respectively. A moderate enhancement in thermal conductivity of the magnetite nanoparticledoped fluid was observed; being intensified with temperature increase. The dynamic viscosity of the prepared fluids remains unchanged despite infusion of the nanoparticles. However, the results turn out significant enhancement in electrical properties and moderate improvement in thermos-physical properties of the nanofluids; holistic investigations should be conducted to achieve an optimized formulation in terms of the type and concentration of the nanoparticle.
AB - This study reports on engineering of stable magnetite nanofluids for application in high voltage technology. Iron oxide (Fe 3O 4) nanoparticles were synthesized by the bottom-up approach. Nanofillers were functionalized with a surfactant and subsequently dispersed in a diluent. Nanoparticles were characterized with transmission electron microscopy (TEM), thereby the average size of 10 nm was determined for nanoparticles in concentrated solution. This colloid is diluted in synthetic ester as base liquid in two concentrations. The high stability of the colloids was confirmed with dynamic light scattering (DLS). AC breakdown voltage beside dielectric properties of the nanofluids were measured. The results show a significant improvement of the breakdown voltage strength. Magnetite nanoparticles are de facto electrically conductive, therefore addition of magnetite nanofillers gives rise to dielectric loss factor. However, magnetite nanoparticles possess much higher relative permittivity compared to the used working fluid, relative permittivity of the colloid increases slightly by infusion of the nanofillers. The thermal conductivity and dynamic viscosity were measured using a transient hot wire setup and a rotational rheometer, respectively. A moderate enhancement in thermal conductivity of the magnetite nanoparticledoped fluid was observed; being intensified with temperature increase. The dynamic viscosity of the prepared fluids remains unchanged despite infusion of the nanoparticles. However, the results turn out significant enhancement in electrical properties and moderate improvement in thermos-physical properties of the nanofluids; holistic investigations should be conducted to achieve an optimized formulation in terms of the type and concentration of the nanoparticle.
KW - AC breakdown voltage
KW - Dynamic viscosity
KW - Magnetite nanoparticle
KW - Nanofluid
KW - Synthetic ester
KW - Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=85085038522&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-31680-8_54
DO - 10.1007/978-3-030-31680-8_54
M3 - Conference contribution
SN - 978-3-030-31682-2
SN - 978-3-030-31679-2
VL - 2
T3 - Lecture Notes in Electrical Engineering
SP - 540
EP - 548
BT - Proceedings of the 21st International Symposium on High Voltage Engineering, Volume 2, ISH 2019
A2 - Nemeth, Balint
ER -