Controlled shape formation of particles in a stirred media mill

目的是为了更好地理解搅拌介质磨机中受控形状形成的过程结构关系。研究的重点是不同材料系统（金属、聚合物和玻璃）在磨珠之间特定机械应力下的形状控制以及相应形状变化的适当表征。不同材料体系的受控形状形成动力学既受过程控制，又受材料功能控制。材料功能由材料系统（铜，铝，聚苯乙烯，硼硅酸盐玻璃，钠石灰玻璃）的选择来定义，而过程功能可以通过搅拌器速度，研磨介质尺寸和密度以及处理时间等参数轻松改变。因此，对各种过程功能参数的研究应该可以更深入地了解搅拌球磨机中不同材料系统的应力。在扫描电子显微镜下，通过原位显微操作对单个颗粒进行了微观力学研究。单颗粒的原位扫描电镜显微机械臂的定向应用已经在各种材料体系中进行，并建立了方法。所有实验微操作数据均通过有限元模拟验证。此外，一种有前途的方法扩展了方法谱，用于表征具有不同形态的大量单个颗粒（流式细胞术）。这种方法依赖于单粒子与聚焦激光束的相互作用。由于单个粒子的大小和形状相关的正向和横向散射，可以从测量的散射信号推断出纵横比。此外，颗粒系统的扫描电镜图像被记录和评估在厚度和横向尺寸方面。结合两种方法进行了验证，为确定搅拌介质磨机的形状开辟了新的途径。此外，通过ICP - OES， FTIR和XRD可以收集到关于化学成分，结构以及在搅拌介质磨中处理的材料系统变化的重要信息。最后，在这个项目中获得的知识将被转移到具有定制成分的玻璃上，用于电化学存储等应用。

The objective is to better understand process-structure relationships for the controlled shape formation in a stirred media mill. The research focus is on the shape control of different material systems (metals, polymers and glasses) under specific mechanical stress between grinding beads as well as suitable characterization of the accompanied shape change. The kinetics of the controlled shape formation of different material systems is controlled by the process as well as material function. The material function is defined by the choice of material systems (Cu, Al, polystyrene, borosilicate glass, soda-lime glass), while the process function can be easily varied by parameters such as agitator speed, grinding media size and density as well as process time. Therefore a study of various process function parameters should allow a deeper understanding of the stress of different material systems in a stirred ball mill. Micromechanical investigations on single particles are carried out by in-situ micromanipulation in a scanning electron microscope. The targeted application of single particles with an in-situ SEM micromanipulator has already been carried out for a variety of material systems and the methodology has been established. All experimental micromanipulation data is validated by FEM simulations. In addition, the method spectrum is extended by a promising method for the characterization of large numbers of single particles with varying morphologies (flow cytometry). This method relies on single particle interaction with a focused laser beam. As a result of the size- and shape-dependent forward and lateral scattering of the individual particles, it is possible to deduce the aspect ratio from the measured scattering signal. In addition, SEM images of the particulate systems are recorded and evaluated in terms of thickness and lateral dimensions. The combination of both methods is used for validation and opens up new ways of determining the shape formation in stirred media mill. Additionally, important information can be gathered via ICP OES, FTIR and XRD with regard to chemical composition, structure as well as changes of the material systems due to the processing in a stirred media mill. Finally, the knowledge that is gained in this project will be transferred to glasses with tailor-made compositions for applications such as electrochemical storage.