Concentrated Colloidal Suspensions in Modulated Light Fields (C07)

在前一个资助期(我们的第一个资助期)，我们设计、建造和测试了两个补充仪器，用于应用光场和同时观察胶体悬浮液。此外，我们还开发了一个分析程序，以提取定量的结构和动态信息。利用这些仪器和程序，我们已经开始研究光场对单个粒子的影响和浓缩胶体的排列。我们已经观察到了与D3计划中的理论预测类似的光诱导结构。现在，我们希望进一步开发设备和方法，并研究浓缩平衡(液体)和非平衡(玻璃)样品在调制电势中的行为。我们建议研究初始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的硬球，并将结果与C3、C4和D3项目中的预测进行比较。此外，我们计划研究玻璃在外加电势的影响下是否以及在什么条件下结晶，以及外加电势如何不仅影响静态，而且还影响阻滞态的动态性质。此外，我们希望研究部分猝灭的系统，并将它们的行为与阻滞态的动力学进行比较。与A5和A7项目的密切互动将使我们能够将我们的实验结果与模拟和理论预测进行比较。

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.