Dielectrophoresis-Magnetophoresis Force Driven Magnetic Nanoparticle Movement in Transformer Oil Based Magnetic Fluids

Title
Dielectrophoresis-Magnetophoresis Force Driven Magnetic Nanoparticle Movement in Transformer Oil Based Magnetic Fluids
Authors
이종철이상엽
Keywords
Magnetic Nanoparticle; Dielectrophoresis; Magnetophoresis; Dielectric Breakdown Voltage; Microchannel
Issue Date
2013-09
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 13, NO 9, 6179-6182
Abstract
Magnetic fluid is a stable colloidal mixture contained magnetic nanoparticles coated with a surfactant. Recently, it was found that the fluid has properties to increase heat transfer and dielectric characteristics due to the added magnetic nanoparticles of transformer oils. The magnetic nanoparticles in the fluid experience an electrical force directed toward the place of maximum electric field strength when the electric field is applied. And when the external magnetic field is applied, the magnetic nanoparticles form long chains oriented along the direction of the field. The behaviors of magnetic nanoparticles in both the fields must play an important role in changing the heat transfer and dielectric characteristics of the fluids. In this study, we visualized the movement of magnetic nanoparticles influenced by both the fields applied in-situ. It was found that the magnetic nanoparticles travel in the region near the electrode by the electric field and form long chains along the field direction by the magnetic field. It can be inferred that the movement of magnetic nanoparticles appears by both the fields, and the breakdown voltage of transformer oil based magnetic fluids might be influenced according to the dispersion of magnetic nanoparticles.
URI
http://pubs.kist.re.kr/handle/201004/46048
ISSN
15334880
Appears in Collections:
KIST Publication > Article
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