Controlled shape formation of particles in a stirred media mill

其目的是更好地了解在搅拌介质磨控制形状形成的过程结构关系。研究重点是在研磨珠之间的特定机械应力下不同材料系统（金属，聚合物和玻璃）的形状控制以及伴随的形状变化的适当表征。不同材料系统的受控形状形成的动力学由工艺以及材料功能控制。材料功能由材料系统（铜、铝、聚苯乙烯、硼硅酸盐玻璃、钠钙玻璃）的选择来定义，而工艺功能可以通过搅拌器速度、研磨介质尺寸和密度以及工艺时间等参数轻松改变。因此，对各种过程函数参数的研究应该能够更深入地了解搅拌球磨机中不同物料系统的应力。在扫描电子显微镜中，通过原位微操作对单个颗粒进行微观力学研究。单颗粒的有针对性的应用与原位SEM显微操作器已经进行了各种材料系统和方法已经建立。所有的实验数据进行了验证有限元模拟。此外，该方法的光谱扩展了一个有前途的方法，用于表征大量的单颗粒具有不同的形态（流式细胞术）。这种方法依赖于单个粒子与聚焦激光束的相互作用。由于单个颗粒的尺寸和形状相关的前向和侧向散射，可以从测量的散射信号推导出纵横比。 此外，颗粒系统的SEM图像记录和评价的厚度和横向尺寸。这两种方法的结合用于验证，并开辟了新的方法来确定形状形成搅拌介质磨。此外，还可以通过ICP OES、FTIR和XRD收集有关材料体系的化学组成、结构以及在搅拌介质研磨机中加工过程中发生的变化的重要信息。最后，在该项目中获得的知识将转移到具有定制成分的玻璃中，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.