Dynamics of Self-Assembled Chaining in Magnetorheological Fluids
The aggregation dynamics of paramagnetic spherical particles embedded in a viscous fluid is investigated via numerical simulations using a fully coupled three-dimensional model. Particles experience simultaneously Brownian motion, dipolar magnetic attraction, and multibody hydrodynamic interactions....
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| Veröffentlicht in: | Langmuir 2004-01, Vol.20 (2), p.507-513 |
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| creator | Climent, Eric Maxey, Martin R Karniadakis, George Em |
| description | The aggregation dynamics of paramagnetic spherical particles embedded in a viscous fluid is investigated via numerical simulations using a fully coupled three-dimensional model. Particles experience simultaneously Brownian motion, dipolar magnetic attraction, and multibody hydrodynamic interactions. When the dipole strength characterizing the ratio of magnetic attraction to random diffusion exceeds a critical value, particles join together forming supraparticle structures. As time evolves, particle/chain and chain/chain interactions lead to a continuous increase of the cluster size. The mean length of particle chains has a power-law dependence with respect to time, as predicted by the theory of diffusion-limited aggregation. Both the exponent and the characteristic time scale agree very well with the experimental results of Promislow et al. (J. Chem. Phys. 1995, 102, 5492). |
| doi_str_mv | 10.1021/la035540z |
| format | Article |
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| title | Dynamics of Self-Assembled Chaining in Magnetorheological Fluids |
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