Directed assembly of small binary clusters of magnetizable ellipsoids,Soft Matter

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Directed assembly of small binary clusters of magnetizable ellipsoids
Soft Matter ( IF 2.9 ) Pub Date : 2024-07-27 , DOI: 10.1039/d4sm00300d
David H Harris ₁ , Isaac Torres-Díaz ₁

Affiliation

We report the effect of shape anisotropy and material properties on the directed assembly of binary suspensions composed of magnetizable ellipsoids. In a Monte Carlo simulation, we implement the ellipsoid–dipole model to calculate the pairwise dipolar interaction energy as a function of position and orientation. The analysis explores dilute suspensions of paramagnetic and diamagnetic ellipsoids with different aspect ratios in a superparamagnetic medium. We analyze the local order of binary structures as a function of particle aspect ratio, medium permeability, and dipolar interaction strength. Our results show that local order and symmetry are tunable under the influence of a uniform magnetic field when one component of the structure is dilute with respect to the other. The simulation results match previously reported experiments on the directed assembly of binary suspension of spheres. Additionally, we report the conditions on particle aspect ratios and medium properties for various structures with rotational symmetries, as well as open and enclosed structures under the influence of a uniform magnetic field.

中文翻译：

可磁化椭球体小二元簇的定向组装

我们报告了形状各向异性和材料特性对由可磁化椭球体组成的二元悬浮液定向组装的影响。在蒙特卡罗模拟中，我们实现了椭球偶极子模型来计算成对偶极相互作用能作为位置和方向的函数。该分析探讨了超顺磁介质中具有不同纵横比的顺磁和反磁椭球体的稀悬浮液。我们分析了二元结构的局部顺序作为粒子长宽比、介质渗透性和偶极相互作用强度的函数。我们的结果表明，当结构的一个组成部分相对于另一个组成部分稀释时，局部有序性和对称性在均匀磁场的影响下是可调的。模拟结果与先前报道的二元悬浮球体定向组装实验相匹配。此外，我们还报告了均匀磁场影响下各种旋转对称结构以及开放和封闭结构的粒子长宽比和介质特性的条件。

更新日期：2024-07-27

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