Two-dimensional Monte Carlo simulations of a colloidal dispersion composed of rod-like ferromagnetic particles in the absence of an applied magnetic field.
Two-dimensional Monte Carlo simulations of a colloidal dispersion composed of rod-like ferromagnetic particles in the absence of an applied magnetic field.
复制标题
在没有施加磁场的情况下，对由棒状铁磁颗粒组成的胶体分散体进行二维蒙特卡罗模拟。
DOI：
10.1016/j.jcis.2005.06.035
复制
发表时间：
2006
影响因子：
9.9
通讯作者：
A. Satoh
中科院分区：
文献类型：
--
作者：
M. Aoshima;A. Satoh
采用团簇移动Monte Carlo方法研究了棒状铁磁颗粒组成的胶体分散体系中颗粒间的磁相互作用和颗粒长径比对聚集体结构的影响。根据团簇的数密度分布和径向分布函数分析了模拟得到的聚集体的内部结构。结果表明，随着粒子间磁相互作用的增强，形成了许多小的团簇，如反平行粒子对、筏状团簇和小环状团簇;这些团簇聚集形成更大的聚集体。在粒子之间相对强的磁相互作用的情况下，当纵横比约为2时，形成固体状矩形簇，因为磁荷之间的合适距离使粒子能够形成两个正常反平行粒子对的基本结构。当纵横比增加超过2时，形成许多更稳定的筏状团簇，因为磁荷之间距离的增加使得两个正常的反平行粒子对结构不稳定。对于显著较大的纵横比，通过形成许多链状和环状结构来产生大的网络微结构。
Influences of the magnetic interaction between particles and the aspect ratio of particles on aggregate structures in a colloidal dispersion composed of rod-like ferromagnetic particles were investigated by means of the cluster-moving Monte Carlo method. The internal structures of the aggregates obtained in simulations were analyzed in terms of the number density distribution of the clusters and radial distribution functions. The results show that as the magnetic interaction between particles increases, many small clusters such as anti-parallel particle pairs, raft-like clusters, and small loop-like clusters are formed; these gather to form larger aggregates. In the case of a relatively strong magnetic interaction between particles, solid-like rectangular clusters are formed when the aspect ratio is approximately 2, since the suitable distance between magnetic charges enables particles to form a fundamental structure of two normal anti-parallel particle pairs. As the aspect ratio increases beyond 2, many more stable raft-like clusters are formed, since the increase in distance between magnetic charges makes the two normal anti-parallel particle pair structures unstable. For a significantly larger aspect ratio, large network microstructures are produced by the formation of many chain-like and loop-like structures.