Dependence of the regime change in particle aggregates on the composition ratio of magnetic cubic particles with different magnetic moment directions
Dependence of the regime change in particle aggregates on the composition ratio of magnetic cubic particles with different magnetic moment directions
复制标题
颗粒聚集体状态变化对不同磁矩方向磁性立方颗粒组成比的依赖性
DOI：
10.1016/j.colsurfa.2017.07.078
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Satoh Akira
中科院分区：
文献类型：
--
作者：
Okada Kazuya;Satoh Akira
我们在这里讨论由磁性立方颗粒组成的悬浮液在材料表面上的行为，以便将磁性立方颗粒悬浮液的特性应用于表面改性技术的开发。假设在平行于材料表面的方向上施加磁场，并且假设立方体赤铁矿颗粒在颗粒的对角线方向上具有磁矩。此外，在强引力场的情况下，假设立方体颗粒被束缚在材料表面上，并且每个立方体颗粒的一个面与材料或底表面平面接触。在之前的研究中，我们集中研究了这样的情况：一半系综粒子的磁矩指向相对于材料表面的向上对角线方向，而其他粒子则具有相对于材料表面的向下对角线方向。我们在这里将先前的研究扩展到通过在这两个方向上排列的磁矩数量的比率来描述的各种系综。从准二维蒙特卡罗模拟可以看出，这些立方颗粒的组成比对颗粒聚集体的形态有显着影响。也就是说，随着组成比的降低，紧密堆积的聚集体的尺寸变得更小，并且在强磁场的情况下倾向于优选细的线状团簇。此外，组成比的降低往往会减弱颗粒聚集体中因磁性颗粒-颗粒相互作用强度的变化而发生的状态变化。
We here discuss the behaviour of a suspension composed of magnetic cubic particles on a material surface in order to apply the characteristics of a magnetic cubic particle suspension to the development of surface modification technology. A magnetic field is assumed to be applied in a direction parallel to the material surface and the cubic hematite particles are assumed to have a magnetic moment in the diagonal direction of the particle. Moreover, in the situation of a strong gravitational field, the cubic particles are assumed to be bound on the material surface with a face of each cubic particle in contact with the material or bottom surface plane. In a previous study we concentrated on the situation where half the ensemble particles have a magnetic moment pointing in the upward diagonal direction and the others in the downward diagonal direction relative to the material surface. We here expand the previous study to a variety of ensembles described by a ratio of the number of the magnetic moments aligning in these two directions. From quasi-2D Monte Carlo simulations, it is seen that the composition ratio of these cubic particles has a significant effect on the regime of the particle aggregates. That is, with decreasing composition ratio, the size of closely-packed aggregates becomes smaller, and thin linear clusters tend to be preferred in the situation of a strong magnetic field. Furthermore, a decrease in the composition ratio tends to dull the occurrence of regime change in particle aggregates for a change in the magnetic particle–particle interaction strength.