Dynamics of self-assembled chaining in magnetorheological fluids

被引：97

作者：

Climent, E ^{[1
]}

Maxey, MR ^{[1
]}

Karniadakis, GE ^{[1
]}

机构：

[1] Brown Univ, Ctr Fluid Mech, Div Appl Math, Providence, RI 02912 USA

来源：

LANGMUIR | 2004年 / 20卷 / 02期

关键词：

D O I：

10.1021/la035540z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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).

引用

页码：507 / 513

页数：7

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