Concentrated Colloidal Suspensions in Modulated Light Fields (C07)

调制光场中的浓缩胶体悬浮液 (C07)

• 批准号: 14066390
• 金额: --
• 依托单位: Lehrstuhl für Physik der weichen Materie
• 依托单位国家: 德国
• 项目类别: CRC/Transregios
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/14066390?language=en
• 关键词: Concentrated; Colloidal; Suspensions; Modulated; Light

During the previous funding period (our first funding period) we designed, constructed and tested two complementary instruments for the application of light fields and the simultaneous observation of colloidal suspensions. Furthermore, we have developed an analysis programme to extract quantitative structural and dynamic information. Using these instruments and procedures we have started to investigate the effect of a light field on individual particles and the arrangement of concentrated colloids. We have observed light-induced structures which are similar to theoretical predictions developed in project D3.We now want to exploit the equipment and methodology further and investigate the behaviour of concentrated equilibrium (liquid) and non-equilibrium (glassy) samples in modulated potentials. We propose to study the induced structures and dynamics in initially liquid samples, which might be hard spheres or hard spheres with depletioninduced attraction, and compare the results to predictions developed in projects C3, C4 and D3. Furthermore, we plan to investigate whether and under which conditions glasses crystallize under the influence of an external potential and how an external potential affects not only the static, but also the dynamic properties of arrested states. In addition, we wish to investigate partially-quenched systems and compare their behaviour to the dynamics of arrested states. A close interaction with projects A5 and A7 will allow us to compare our experimental results to simulation and theory predictions.

在上一个资助期间（我们的第一个资助期间），我们设计、建造和测试了两个互补的仪器，用于应用光场和同时观察胶体悬浮液。此外，我们开发了一个分析程序来提取定量结构和动态信息。使用这些仪器和程序，我们开始研究光场对单个颗粒和浓缩胶体排列的影响。我们观察到了与 D3 项目中开发的理论预测相似的光诱导结构。我们现在希望进一步利用设备和方法，并研究调制电位中浓缩平衡（液体）和非平衡（玻璃态）样品的行为。我们建议研究最初液体样品中的诱导结构和动力学，这些样品可能是硬球或具有耗尽诱导吸引力的硬球，并将结果与​​项目 C3、C4 和 D3 中开发的预测进行比较。此外，我们计划研究玻璃是否以及在什么条件下在外部电势的影响下结晶，以及外部电势如何影响捕获态的静态特性和动态特性。此外，我们希望研究部分淬火系统并将其行为与捕获态的动态进行比较。与项目 A5 和 A7 的密切互动将使我们能够将实验结果与模拟和理论预测进行比较。