Institute of Mechatronic Engineering, Chair of Magnetofluiddynamics, Measuring and Automation Technology, Technische Universität Dresden, 01062 Dresden, Germany.
Philos Trans A Math Phys Eng Sci. 2020 May 15;378(2171):20190256. doi: 10.1098/rsta.2019.0256. Epub 2020 Apr 13.
Structured and polymerized in a uniform external magnetic field, polymer composites based on magnetic soft microparticles are considered. Variations of magnetic field parameters and material composition provide a possibility of targeted micro-structural patterning of these composites. The influences of parameter variations on the resulting internal micro-structure of the low concentrated specimens are evaluated and visualized using optical microscopy and microcomputed tomography. The experimental findings are discussed in order to provide advanced possibilities of controlled patterning of soft magnetic materials. It is experimentally demonstrated that the final three-dimensional morphology of composite structure is determined mainly by the concentration of magnetic powder. The intensity of the applied magnetic field influences the rate of structuring of particles in initially viscous media and, therefore, may provide a potential opportunity to obtain non-ergodic microstructures when the matrix is polymerized before the particles have completed the structuring process. The results obtained can serve as a basis for further development of the engineering method of targeted patterning. The method is intended to obtain a material with the desired microstructure by selecting specific parameters of external stimuli and components of the composite. This article is part of the theme issue 'Patterns in soft and biological matters'.
基于磁性软质微球的聚合物复合材料被认为是在均匀外磁场中进行结构化和聚合的。磁场参数和材料组成的变化提供了对这些复合材料进行靶向微结构图案化的可能性。使用光学显微镜和微计算机断层扫描评估和可视化参数变化对低浓度样品中产生的内部微观结构的影响。为了提供软磁材料的受控图案化的先进可能性，对实验结果进行了讨论。实验证明，复合材料结构的最终三维形态主要由磁性粉末的浓度决定。施加磁场的强度影响最初粘性介质中颗粒的结构化速度，因此，当基体在颗粒完成结构化过程之前聚合时，可能提供获得非遍历微观结构的潜在机会。所获得的结果可以作为进一步开发目标图案化工程方法的基础。该方法旨在通过选择外部刺激和复合材料的特定参数来获得具有所需微观结构的材料。本文是“软物质和生物物质中的图案”主题问题的一部分。
