Heterogeneous nucleation and microstructure formation in colloidal crystals

胶体晶体中的异质成核和微观结构形成

• 批准号: 51421970
• 负责人: Professor Dr. Hans Joachim Schöpe
• 金额: --
• 依托单位: Arbeitsgruppe Computational Soft Matter and Nanosience
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/51421970?language=en
• 关键词: Heterogeneous; nucleation; microstructure; formation; colloidal

We propose to investigate heterogeneous nucleation and the microstructure evolution in onecomponent and multi-component colloidal melts of various particle interaction bridging different length scales present within this research program. Using various time resolved optical methods, it should be possible to link the observed kinetics to the underlying physical mechanisms. For all aspects of the planned project we arranged collaborations with projects studying heterogeneous nucleation from the theoretical side within the SPP. Inside the project we will look at different types of heterogeneous nucleation. Heterogeneous nucleation on smooth substrates and the following microstructure evolution will be investigated as function of the substrate curvature for different degrees of undercooling. For the first time within the SPP we plan to investigate the heterogeneous nucleation and the microstructure formation introducing structured substrates, varying the lattice spacing and the crystal structure of the substrate. By controlled addition of seeds with various size and concentration we will induce heterogeneous nucleation and will modify the microstructure evolution in close analogy to inoculation in metallic systems. Thereby the determination of the crystallization kinetics and the analysis of the arising microstructure are the most important points.

我们建议调查异质成核和微观结构的演变在单组分和多组分胶体熔体中的各种颗粒相互作用桥接不同的长度尺度本研究计划。使用各种时间分辨的光学方法，应该可以将观察到的动力学与潜在的物理机制联系起来。对于计划项目的各个方面，我们安排了与SPP内从理论方面研究异相成核的项目的合作。在这个项目中，我们将研究不同类型的异质成核。光滑衬底上的异质形核和随后的微观结构演变将被研究为不同程度的过冷度的衬底曲率的函数。对于第一次在SPP内，我们计划调查的异质成核和微观结构的形成引入结构化的基板，改变晶格间距和基板的晶体结构。通过控制添加具有不同尺寸和浓度的晶种，我们将诱导异质形核，并将修改微观结构演变，与金属系统中的孕育非常相似。因此，结晶动力学的确定和所产生的微观结构的分析是最重要的点。