Theory and Simulation of highly concentrated model ferrofluids in external fields

外场高浓度模型铁磁流体的理论与模拟

• 批准号: 24799459
• 负责人: Professor Dr. Christian Holm
• 金额: --
• 依托单位: Institut für Computerphysik (ICP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/24799459?language=en
• 关键词: Theory; Simulation; highly; concentrated; model

In this project we intend to investigate the structural and magnetic properties of dense, strongly interacting ferrofluids by means of computer simulations and analytical calculations by employing statistical mechanical theory. In particular we will vary the density, dipolar coupling, short range interparticle potential, polydispersity, and externally applied field and monitor their influence on structural and magnetic properties. Of special interest will be the mechanisms leading to the ferromagnetic phase, and other possible morphological phase transitions. In particular we will confine the system to 2D in order to try to reproduce recent experimental findings of strongly interacting ferrofluids yielding an interesting network structure, which is a strong function of density. As far as time permits we will also investigate the dynamical (ac) susceptibility and try to determine the possible forms of particles associations (chains, globules, fractal clusters), the characteristic spectrum of their relaxation times and their influence on the macroscopic magnetic properties of ferrofluids.

在这个项目中，我们打算调查的结构和磁性的致密，强相互作用的铁磁流体的计算机模拟和分析计算的手段，采用统计力学理论。特别是，我们将改变密度，偶极耦合，短程粒子间的潜力，多分散性，和外部施加的领域和监测其对结构和磁性的影响。特别感兴趣的是导致铁磁相的机制，以及其他可能的形态相变。特别是，我们将限制系统的2D，以试图重现最近的实验结果的强烈相互作用的铁磁流体产生一个有趣的网络结构，这是一个强大的密度函数。只要时间允许，我们还将研究动态（ac）磁化率，并尝试确定粒子关联的可能形式（链、小球、分形簇）、其弛豫时间的特征谱及其对宏观磁性的影响铁磁流体。