Magnetomechanical Coupling of Single Domain Particles in Viscoelastic Matrices for Actuation and as Probes for Nanorheology

变形材料和其他刺激敏感材料开辟了新的视角和广泛的潜在应用——从机器人的新型驱动器到在体内展开的生物医学设备，再到适应环境的服装。该项目的总体目标是开发、实现和研究一个功能性的乐高系统，例如不同结构的聚合物或液晶基质，以及纳米颗粒、磁性探针和致动器组件，从而构建具有新颖、场控特性的磁活性杂化材料。在第一个资助期内，方法开发和铁水凝胶的研究是项目的重点，而在第二个资助期内，我们的乐高系统成功扩展到液晶系统。在最后的资助期，我们努力实现磁活性三元杂化材料，包含磁性纳米颗粒，聚合物和低分子介质，并针对磁性，向列和弹性体组分之间的相互耦合。在目前已开发和研究的混合结构的基础上，我们将采用液晶元件来增强不同结构和几何构型下磁性元件与弹性矩阵之间的耦合。利用磁性导向器、向列导向器和弹性导向器之间的不同模式和程度的耦合，期望得到磁力学和磁光效应的谱。铁氧体聚合物和弹性体在磁光存储设备和显示器以及磁致动器和传感器方面具有应用潜力。

Shape-changing materials and other stimuli-sensitive materials open new perspective and a broad range of prospective applications - from novel actuators for robotics via biomedical devices that unfold in the body to clothing that adapts to its environment. The overall goal of the project is the development, realization and investigation of a lego system of functional, e. g. polymer or liquid-crystalline matrices of varying architecture and a nanoparticulate, magnetic probe- and actuator component, allowing the construction of magnetoactive hybrid materials with novel, field-controlled properties.In the first funding period, method development and the investigation of ferrohydrogels was in the focus of the project, while iin the second, our lego system was succesfully expanded to liquid-crystalline systems. For the final funding period, we strive to the realization of magnetoactive ternary hybrid materials, containing magnetic nanoparticles, polymers, and low molecular mesogens, and aiming at a interactive coupling between the magnetic, nematic and elastomeric component.Based on the yet developed and investigated hybrid architectures we will employ liquid crystalline component for the enhancement of the coupling between the magnetic component and elastic matrix in the different architectures and geometric configurations.Using different modes and degrees of coupling between the magnetic, the nematic and the elastomeric director, a spectrum pf magnetomechanical and magnetooptic effects are expected. Ferronematic polymers and elastomers posses potential for the application in magnetooptical storage devices and displays, and as magnetoactive actuators and sensors.