Spectroscopic investigation of sintering of nanoparticles

纳米颗粒聚集体在工业应用方面具有很高的潜力，例如用于颜料、催化剂、气体传感器、燃料电池、太阳能电池或热电元件。这一电位受到所产生的颗粒的形态参数的显著影响。在这里，烧结程度越来越成为人们关注的焦点。例如，烧结的程度可以增加机械稳定性，而完全烧结会导致所需性能的损失。因此，对烧结过程进行有效的监测和控制显得十分重要。迄今为止，主要采用碰撞试验来表征骨料的烧结程度。然而，由于这些方法缺乏在线功能，因此不能用于进程监视。因此，在这个项目中，我们想研究测量光谱分辨透射来表征骨料内烧结程度的可能性。基于光散射模拟的研究将研究聚集体的结构性质与其光谱行为之间的关系。这样做是为了收集如何从光谱透射率的测量中确定烧结程度的信息。目前，研究光谱中极大值的位移被认为是一种很有前途的方法。此外，适当的实验设置将与相应的策略一起开发，以验证概念。将建立实验装置，并对所提出的方法的能力和灵敏度进行测试。总之，在这个项目中，我们想研究通过测量光谱透射来表征纳米颗粒聚集体烧结程度的可能性。

Aggregates of nanoparticles demonstrate a high potential for industrial applications, e.g. for colour pigments, catalysts, gas sensors, fuel cells, solar cells or thermoelectric components. This potential is significantly influenced by the morphologic parameters of the produced particles. Here, the degree of sintering gets more and more into the focus. For example the degree of sintering can increase the mechanical stability, while complete sintering can lead to the loss of desired properties. Thus, an effective monitoring and control of the sintering process seems to be important.So far, mainly collision experiments are used to characterize the degree of sintering of aggregates. However, these methods cannot be used for process monitoring because of their lack of online capability. Therefore in this project we would like to investigate the possibilities of measuring the spectrally resolved transmission to characterize the degree of sintering within aggregates. By studies based on light scattering simulations the relation between the structural properties of the aggregates and their spectral behaviour will be investigated. This is done to collect information about how the degree of sintering can be determined from the measurement of spectral transmittance. At present, studying the shift of the maximum in the spectrum is considered to be a promising approach. Additionally, an appropriate experimental setup will be developed together with a corresponding strategy to validate the concept. The experimental setup will be erected and the proposed method will be tested for its capabilities and sensitivity. In summary, in this project we would like to investigate the possibilities to characterize the degree of sintering within aggregates of nanoparticles by measuring the spectral transmission.