Structure and dynamics of colloidal particles on incommensurate substrates

胶体粒子在基底上的行为对于胶体物理学中的许多应用都很重要，如光子晶体，胶体纳米膜或具有特殊流变，摩擦或润滑特性的新型材料。此外，基质上的胶体非常适合作为模型系统，以研究通常靠近结构化表面的颗粒发生的复杂过程。在这个项目中，我们想集中在基板的对称性是不相称的胶体晶体在散装的内在对称性的影响。接近这样的基板，有趣的胶体相发生由于粒子间的相互作用，有利于散装秩序和与基板的相互作用，试图诱导一个不相称的结构之间的竞争。此外，我们的目标是更好地了解有关晶体和准晶结构的生长过程的基本属性。我们还期望观察到新的动力学现象。例如，时间依赖性底物或拖曳力将用于研究胶体非平衡动力学。最后，我们想了解更多关于外部影响的堵塞或玻璃化转变，通过探索密度胶体系统的动力学与随机或至少不相称的捕获网站的墙壁附近的减速。

The behavior of colloidal particles on substrates is important for a lot of applications in colloidal physics like photonic crystals, colloidal nanofilms, or novel materials with special rheological, frictional, or lubrication properties. Furthermore, colloids on substrates are perfectly suitable as a model system to study complex processes that occur for particles close to structured surfaces in general. In this project, we want to focus on the influence of substrates whose symmetry is incommensurate to the intrinsic symmetry of a colloidal crystal in bulk. Close to such substrates, interesting colloidal phases occur due to the competition between the inter-particle interaction that favors the bulk order and the interaction with the substrate that tries to induce an incommensurate structure. Furthermore, our goal is to better understand the fundamental properties concerning the growth processes of crystalline and quasicrystalline structures. We also expect to observe new dynamical phenomena. For example, time-dependent substrates or drag forces will be used to study colloidal non-equilibrium dynamics. Finally, we want to learn more about external influences on the jamming or glass transition by exploring the slowdown of the dynamics for dense colloidal systems close to a wall with random or at least incommensurate trapping sites.