Relaxation Dynamics in Glassy Systems and Pattern Formation

9722646纳格尔这个更新项目包含了一系列关于过冷液体动力学的实验。特别是，介电光谱学的一个扩展将被实施，以便能够研究“强”的玻璃形成物。将对有序材料进行研究，看看它们是否具有与在无序材料中观察到的相同的复杂反应。最后，将对玻璃形成液体的低角散射进行研究，以探索团簇效应。此外，还提出了图案形成的实验方案。将继续进行早期的摄影和模拟研究，探测靠近一滴液体分裂成两个独立部分的界面。此外，还将研究在强电场存在下流体的形状。最后，我们将研究接触线沉积的问题，这是一种当部分润湿的液滴在表面干燥时发生的现象。%这个更新项目包含一系列关于液体在冷却时变得越来越抗流的机制的实验。如果充分冷却，它将形成一个分子运动受到高度限制的玻璃。我们将研究分子在各种液体和无序固体中的运动，以了解这种玻璃形成现象。这些研究将包括对行为的电子探测器以及对中子源和同步加速器源的使用。此外，还提出了利用高速摄影和数值模拟来研究在技术重要的情况下如何形成图案的实验。将研究的一种情况是一滴液体如何分裂成不止一块。此外，还将研究在强电场存在下流体的形状。最后，我们将研究接触线沉积的问题，这是一种当一滴液体在表面干燥时发生的现象。***

9722646 Nagel This renewal project contains a series of experiments concerning the dynamics in supercooled liquids. In particular, an extension of dielectric spectroscopy will be implemented so that an investigation of "strong" glass formers can be made possible. A study of ordered materials will be carried out to see if they have the same complex response as has been observed in their disordered counterparts. Finally, there will be a study of the low-angle scattering from glass-forming liquids in order to search for clustering effects. In addition, experiments on pattern formation are proposed. There will be a continuation of earlier photographic and simulation studies that probe the interface near where a single drop of liquid splits into two separate pieces. In addition there will be an investigation of the shape of the fluid in the presence of an intense electric field. Finally there will be a study of the problem of contact line sedimentation, a phenomenon which occurs whenever a partially wetting drop of liquid dries on a surface. %%% This renewal project contains a series of experiments concerning the mechanism by which a liquid becomes increasingly more resistant to flow as it is cooled. If cooled sufficiently, it will form a glass where the molecular motion is highly constrained. We will study the molecular motion in a variety of liquids and disordered solids to understand this glass-formation phenomenon. These studies will include electronic probes of the behavior as well as the use of neutron and synchrotron sources. In addition, experiments are proposed to investigate how pattern formation occurs in technologically important situations using high- speed photography and numerical simulations. One situation that will be studied is how a drop of liquid splits into more than one piece. There will also be an investigation of the shape of the fluid in the presence of an intense electr ic field. Finally there will be a study of the problem of contact-line sedimentation, a phenomenon occurring whenever a drop of liquid dries on a surface. ***