3D measurement of field-induced deformations in magnetic hybrid materials

磁性混合材料中场致变形的 3D 测量

• 批准号: 237992678
• 负责人: Dr. Günter K. Auernhammer
• 金额: --
• 依托单位: Institut Physikalische Chemie und Physik der Polymere
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/237992678?language=en
• 关键词: 3D; measurement; field; induced; deformations

The aim of the last funding period of this proposal is to measure the internal deformation in magnetic hybrid materials for systems that are close to real world systems. This information will be used to obtain a well-founded understanding of this class of materials. The methods used are a continuation and further development of those used in the first two founding periods. Using optical microscopy techniques (transmission and confocal microscopy), we determine the trajectories of magnetic particles and tracer particles in the material. This will allow us to deduce the deformation fields and other internal data. Specifically, we intend to 1. characterize precisely the matrix-mediated interaction between magnetic particles. Here the goal is not only the interaction itself, but also the underlying deformation field that can be determined with confocal microscopy. 2. use this interaction, to induce large deformations in the material. This will be done with periodically structured systems that allow for collective effects which enable a larger response of the system to an excitation. 3. measure the deformation field between a few magnetic particles under the influence of an applied magnetic field. Here, we especially aim at a comparison of different length scales, e.g., in collaboration with the Odenbach group. 4. investigate the influence of finite frequencies of the magnetic excitation. Most materials used as matrix materials of magnetic hybrid materials are viscoelastic. This is a strong hint that the magneto-mechanical effects depend on frequency. We intend to investigate these effects. 5. determine specific modes of material failure in magnetic gels. The displacement of magnetic particles in the magnetic hybrid material leads locally to very strong deformations. Do these strong deformations lead to a failure of the material under repeated loading? 6. analyse the influence of free or rigid boundaries on the internal mechanisms. Not only particles in the interior of the magnetic hybrid material influence each other, also surfaces nearby will change the internal dynamics. None of the work packages in this proposal can be dealt with separately. All work packages are connected within this proposal and, more importantly, to other projects.

本提案最后一个资助期的目的是测量接近真实世界系统的磁性混合材料系统的内部变形。这些信息将用于获得对这类材料有充分根据的理解。所使用的方法是前两个创始时期使用的方法的延续和进一步发展。利用光学显微镜技术（透射和共聚焦显微镜），我们确定了材料中磁性颗粒和示踪颗粒的轨迹。这将允许我们推断变形场和其他内部数据。具体来说，我们打算1。精确表征磁性粒子间基质介导的相互作用。这里的目标不仅是相互作用本身，而且是可以用共聚焦显微镜确定的潜在变形场。2. 利用这种相互作用，在材料中引起大的变形。这将在周期性结构系统中实现，这种系统允许集体效应，使系统对激励的响应更大。3. 在外加磁场的作用下，测量几个磁性颗粒之间的变形场。在这里，我们特别着眼于不同长度尺度的比较，例如，与奥登巴赫小组合作。4. 研究了磁激励有限频率的影响。磁性杂化材料的基体材料多为粘弹性材料。这是一个强烈的暗示，磁机械效应取决于频率。我们打算调查这些影响。5. 确定磁性凝胶中材料失效的特定模式。磁性杂化材料中磁性颗粒的位移导致了局部很强的变形。这些强烈的变形是否会导致材料在重复加载下失效？6. 分析自由边界或刚性边界对内部机构的影响。不仅磁性杂化材料内部的粒子相互影响，其附近的表面也会改变其内部动力学。本建议中的任何工作包都不能单独处理。所有的工作包都与本提案相关联，更重要的是与其他项目相关联。