偶极相互作用对单根超分子磁性丝体平衡形态的影响
Effects of the dipolar interaction on the equilibrium morphologies of a single supramolecular magnetic filament in bulk
摘要：
我们研究了三维体系中单个超分子磁丝的平衡形态随磁偶极相互作用有效强度的变化。研究是通过朗之万动力学模拟与珠弹簧链模型的自由旋转偶极子。我们证明了三个结构制度的存在作为偶极耦合参数的值增加：线圈压缩制度，线圈膨胀制度和封闭的链制度，在该制度中的结构逐渐倾向于一个理想的环配置。我们讨论了每个政权的管理效果，开放和封闭的形态之间的结构过渡，以及为什么我们没有看到多回路配置，已观察到在二维系统在类似的条件下的原因。
英文摘要：
We study the equilibrium morphologies of a single supramolecular magnetic filament in a three-dimensional system as a function of the effective strength of the magnetic dipolar interactions. The study is performed by means of Langevin dynamics simulations with a bead-spring chain model of freely rotating dipoles. We demonstrate the existence of three structural regimes as the value of the dipolar coupling parameter is increased: a coil compaction regime, a coil expansion regime and a closed chain regime in which the structures tend progressively to an ideal ring configuration. We discuss the governing effects of each regime, the structural transition between open and closed morphologies, and the reasons why we see no multiloop configurations that have been observed in two-dimensional systems under similar conditions.
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