论文标题
聚合物溶液中磁性纳米颗粒的频率依赖性磁化率：仿真研究
Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study
论文作者
论文摘要
磁复合材料，即具有嵌入式磁性纳米颗粒的弹性体，聚合物凝胶或聚合物溶液，可用于许多技术和生物医学应用。但是，粒子的磁性特性与（Visco）弹性聚合物基质的机械性能之间的耦合机制的微观细节尚未解决。在这里，我们研究了单域球形磁性纳米颗粒的响应，该纳米粒子悬浮在聚合物溶液中与交替磁场的响应。作为相互作用，我们仅考虑排除与聚合物的体积相互作用以及通过溶剂介导的流体动力相互作用。使用线性响应绿色kubo方法计算AC敏感性光谱，并研究了不同聚合物浓度和聚合物长度的影响。将我们的数据与典型磁复合系统的AC易感性的最新测量结果进行了比较[Roeben等，Colloid and Polymer Science，2014，2013--2023]，并证明了此类系统中流体动力耦合的重要性。
Magnetic composite materials i.e. elastomers, polymer gels, or polymer solutions with embedded magnetic nanoparticles are useful for many technical and bio-medical applications. However, the microscopic details of the coupling mechanisms between the magnetic properties of the particles and the mechanical properties of the (visco)elastic polymer matrix remain unresolved. Here we study the response of a single-domain spherical magnetic nanoparticle that is suspended in a polymer solution to alternating magnetic fields. As interactions we consider only excluded volume interactions with the polymers and hydrodynamic interactions mediated through the solvent. The AC susceptibility spectra are calculated using a linear response Green-Kubo approach, and the influences of changing polymer concentration and polymer length are investigated. Our data is compared to recent measurements of the AC susceptibility for a typical magnetic composite system [Roeben et al., Colloid and Polymer Science, 2014, 2013--2023], and demonstrates the importance of hydrodynamic coupling in such systems.
