Dielectrophoresis-Magnetophoresis Force Driven Magnetic Nanoparticle Movement in Transformer Oil Based Magnetic Fluids
- Dielectrophoresis-Magnetophoresis Force Driven Magnetic Nanoparticle Movement in Transformer Oil Based Magnetic Fluids
- 이종철; 이상엽
- Magnetic Nanoparticle; Dielectrophoresis; Magnetophoresis; Dielectric Breakdown Voltage; Microchannel
- Issue Date
- Journal of nanoscience and nanotechnology
- VOL 13, NO 9, 6179-6182
- 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.
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