Magnetorheological properties of a kerosene-based ferrofluid with magnetite particles hydrophobized in the absence of the dispersion medium
| Autor: | Daniela Susan-Resiga, Iosif Malaescu, Catalin Nicolae Marin, Oana Marinica |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Thixotropy Ferrofluid Materials science 02 engineering and technology Apparent viscosity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Physics::Fluid Dynamics Viscosity Particle aggregation 0103 physical sciences Magnetorheological fluid Particle Electrical and Electronic Engineering Composite material 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Physica B: Condensed Matter. 587:412150 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2020.412150 |
| Popis: | A kerosene-based ferrofluid sample was prepared by a method in which the magnetite nanoparticles were stabilized by hydrophobization in the absence of the dispersion medium. This method ensures formation of aggregates that in the presence of a static magnetic field transform into large drop-like particle agglomerations, which disappear when the field vanishes. The Brownian relaxation measurements and the magneto-optical microscopy image demonstrate that the obtained sample exhibits magnetic field induced particle agglomerations. The magnetorheological investigations (i.e. the viscosity curves at different values of the static magnetic field, H, between (0–520) kA/m, the magnetoviscous effect, the temperature dependence of viscosity, the apparent viscosity dependence on Mason number and the thixotropic analysis) demonstrate that the ferrofluids with drop-like particle aggregation induced by the magnetic field exhibit significant magnetorheological effect, recommending them in electro-mechanical devices that operates at micrometric or sub-micrometric scale, where magnetorheological fluids cannot be used. |
| Databáze: | OpenAIRE |
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