How pointed can magnetized ferrofluid tips be?
| Autor: | Aaron Madden, Brian S. Hawkett, Hadi Sabouri, Juan Fernandez de la Mora, Nguyen T. H. Pham |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Fluid Flow and Transfer Processes
Range (particle radiation) Ferrofluid Materials science Condensed matter physics Capillary action Computational Mechanics Radius equipment and supplies Magnetic field Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Stress (mechanics) Modeling and Simulation Magnet Magnetic nanoparticles Physics::Chemical Physics human activities |
| Zdroj: | Physical Review Fluids. 5 |
| ISSN: | 2469-990X |
| Popis: | The typical magnetized ferrofluid tip radius is ~0.1 mm, where capillary stress balances magnetostatic stress. Here we confirm experimentally the controlling role of magnetic saturation in more general conditions, even for ferrofluid menisci in highly nonuniform magnetic fields created by supporting them at a ferrous needle tip facing a strong magnet. We use a wide range of ferrofluid tensions and solvent polarities. Substantial changes in saturation magnetization are achieved with solvent evaporation, and record tip radii to 9.5 mm demonstrated at high volume fractions of magnetic particles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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