Equilibrium structure of ferrofluid aggregates
Equilibrium structure of ferrofluid aggregates
复制标题
铁磁流体聚集体的平衡结构
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
D. Tománek
中科院分区：
文献类型：
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作者：
M. Yoon;D. Tománek
我们研究的平衡结构的大，但有限的磁偶极子，代表一个胶体悬浮的磁铁矿颗粒在铁磁流体的聚集。随着系统规模的增加，结构基元从链状和环状向多链状和多环状的组合体演化。非常大的系统形成单壁和多壁盘管、管和涡卷。这些结构变化的结果，从各种能量项之间的竞争，这可以近似分析在一个连续模型。我们还研究了磁场等外部参数对这些结构的相对稳定性的影响。我们的研究结果可能会给洞察铁磁流体聚集体在温度下的热波动变得可以忽略不计，相比粒子间的相互作用在凝固过程中获得的实验数据。这些数据也可能有助于实验控制磁性粒子的聚集。
We study the equilibrium structure of large but finite aggregates of magnetic dipoles, representing a colloidal suspension of magnetite particles in a ferrofluid. With increasing system size, the structural motif evolves from chains and rings to multi-chain and multi-ring assemblies. Very large systems form single- and multi-wall coils, tubes and scrolls. These structural changes result from a competition between various energy terms, which can be approximated analytically within a continuum model. We also study the effect of external parameters such as magnetic field on the relative stability of these structures. Our results may give insight into experimental data obtained during solidification of ferrofluid aggregates at temperatures where thermal fluctuations become negligible in comparison to inter-particle interactions. These data may also help to experimentally control the aggregation of magnetic particles.