Magnetorheological particle clouds
| Autor: | R.E. Rosensweig |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Ferrofluid Materials science Economies of agglomeration Nanoparticle 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Suspension (chemistry) symbols.namesake Dipole Chemical physics 0103 physical sciences Magnetorheological fluid symbols Particle van der Waals force 0210 nano-technology Astrophysics::Galaxy Astrophysics |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 479:301-306 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2019.02.044 |
| Popis: | It is known that a suspension of relatively large micron-size particles dispersed in a ferrofluid of much smaller particles yields a magnetorheological flui d with superior properties. In the absence of applied field experiment reveals the presence of a nanoparticle cloud surrounding each micron-size particle. The present work derives a thermodynamic model of cloud concentration distribution. It is found that van der Waals forces predominate over magnetic dipolar forces in forming the clouds. Additional analysis reveals that a repulsion force arises due to squeezing of the clouds as two cloud-surrounded particles approach one another. Repulsion aids redispersion of the larger particles by helping to prevent their agglomeration. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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