Research on the description and modification of the wetting phase during shape-selective agglomeration in suspensions.

形状选择性凝聚是一个科学上非常令人兴奋和前瞻性的工作领域。由于形状选择性团聚，不仅可以根据材料类型，还可以根据颗粒形状进行有针对性的分离。这种加工的可能性可以应用于颗粒形状起重要作用的所有技术过程。除了电池材料的回收利用，其他例子还可以在色素生产、食品成分的质地或药物的生物利用度中找到。一个重要的基础是在润湿阶段的悬浮颗粒和结合液滴之间的相互作用的理解。润湿相对于形状选择性附聚的选择性和效率至关重要。在初步工作中，它表明，动态接触角，静态接触角，润湿动力学可以准确地测量在三相系统。该方法现在可用于量化表面活性剂和pH值变化对润湿相的影响。悬浮液中的颗粒和粘合剂液滴的相互作用的问题将使用基于AFM的FluidFM进行研究。成功的形状选择性附聚的一个重要指标是在润湿阶段结束时首次测量的最小扭矩曲线。重要的是要澄清三相系统中的哪些结构变化导致了这一最小值以及随后的扭矩增加。微团聚体中球形颗粒与片晶颗粒的比例是否在这个最小值附近变化，对于基本理解形状选择性团聚是至关重要的。这导致了以下目标：-研究颗粒尺寸对形状选择性团聚的影响。-通过表面活性剂或pH值变化对相互作用伙伴的表面改性对润湿性能的影响。使用FluidFM测量悬浮液中颗粒和结合液滴之间的粘附力。研究润湿阶段结束时扭矩最小值附近的结构变化。通过参数的最佳组合（例如能量输入、表面活性剂添加、pH值和/或扭矩监测）来有针对性地增加形状选择性分离。基于这些发现，第一个唯象描述的形状选择性团聚及其影响参数应该是可能的。

Shape-selective agglomeration is a scientifically extremely exciting and forward-looking field of work. Due to shape-selective agglomeration it will be possible to carry out targeted separation not only according to the type of material, but also according to the particle shape. This possibility of processing can be applied in all technical processes in which the particle shape plays an essential role. In addition to the recycling of battery materials, further examples can be found in pigment production, the texture of food components or the bioavailability of pharmaceuticals. An essential basis is the understanding of interactions between suspended particles and binding liquid droplets during the wetting phase. The wetting phase is essential for the selectivity and efficiency of shape-selective agglomeration. In preliminary work, it was shown that the dynamic contact angle, static contact angle, and wetting kinetics can be accurately measured in the three-phase system. This methodology can now be used to quantify the influence of surfactants and changes in pH on the wetting phase. The issue of the interaction of particles and binder droplets in the suspension fluid will be investigated using a FluidFM based on AFM. An important indication of successful shape-selective agglomeration is the minimum torque curve measured for the first time at the end of the wetting phase. It is important to clarify which structural changes in the three-phase system lead to this minimum and the subsequent to an increase in torque. Whether the ratio of spherical to platelet-shaped particles in the micro-agglomerates changes around this minimum is essential for the basic understanding of shape-selective agglomeration.This leads to the following objectives:- Investigate the influence of particle size on shape-selective agglomeration.- Influence of surface modifications of the interacting partners by surfactants or pH changes on wetting properties.- Measurement of adhesion forces between particles and binding liquid droplets in the suspension liquid using a FluidFM.- Investigation of structural changes around the minimum in the torque at the end of the wetting phase.- Targeted increase of the shape-selective separation by optimal combination of parameters such as energy input, surfactant addition, pH value and/or monitoring of the torque.- Based on these findings, a first phenomenological description of the shape-selective agglomeration and its influencing parameters should be possible.