磁性粒子交联的铁凝胶：用计算机模拟研究场驱动的变形和弹性
Ferrogels cross-linked by magnetic particles: Field-driven deformation and elasticity studied using computer simulations
摘要：
铁凝胶，即磁性颗粒浸入其中的溶胀聚合物网络，可以被认为是“机敏材料“，因为它们的形状和弹性可以由外部磁场控制。利用分子动力学模拟，在粗粒水平上，我们研究了铁凝胶中的磁性粒子作为交联剂的聚合物网络。在均匀的外部磁场中，磁矩的取向与聚合物之间通过共价键的直接耦合引起凝胶的变形，而与颗粒间偶极-偶极相互作用无关。在本文中，我们报告这种变形，凝胶的弹性模量和它的磁响应的定量测量。我们的研究结果表明，这些属性显着依赖于聚合物网络的拓扑结构。
英文摘要：
Ferrogels, i.e. swollen polymer networks into which magnetic particles are immersed, can be considered as "smart materials" since their shape and elasticity can be controlled by an external magnetic field. Using molecular dynamics simulations on the coarse-grained level we study a ferrogel in which the magnetic particles act as the cross-linkers of the polymer network. In a homogeneous external magnetic field the direct coupling between the orientation of the magnetic moments and the polymers by means of covalent bonds gives rise to a deformation of the gel, independent of the interparticle dipole-dipole interaction. In this paper we report quantitative measurements of this deformation, the gel's elastic moduli and its magnetic response. Our results demonstrate that these properties depend significantly on the topology of the polymer network.
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