Cooperative effects and dynamics of magnetic nanoparticles in polymeric fluids

该项目的目的是研究聚合物流体中磁性纳米颗粒的静态和动态。我们特别关注场致结构的形成、交流磁化率、扩散以及纳米和宏观流变性质之间的联系及其对外部磁场的依赖性。调查将主要通过计算机模拟相当详细的，但介观模型。然而，我们也想探索简化模型的可能性，在福克-普朗克方程的有效potential.Finally，我们将应用规模桥接算法，以连接模拟模型的宏观，热力学描述。由于纳米颗粒的宿主介质既不是简单的流体也不是纯弹性固体，因此计划的研究可以帮助将铁磁流体的知识转移到铁磁凝胶领域，特别是因为粘弹性的程度可以在我们将考虑的模型中进行调整。

The aim of this project is to study the statics and dynamics of magnetic nanoparticles in a polymeric fluid.We pay special attention to field-induced structure formation, the AC-susceptibility, diffusion, as well as the link between nano- and macroscopic rheological properties and their dependence on an external magnetic field. The investigations will mostly be done by computer simulations of rather detailed, yet mesoscopic models. However, we also want to explore the possibility of simplified models in terms of Fokker-Planck equations with effective potentials.Finally, we will apply a scale-bridging algorithm in order to connect the simulation model to the macroscopic, thermodynamic description. Since the host medium of the nanoparticles is neither a simple fluid nor a purely elastic solid, the planned studies can help to transfer the knowledge from ferrofluids into the field of ferrogels, especially since the degree of viscoelasticity can be tuned in the models that we will consider.