Relaxation Dynamics in Glassy Systems and Pattern Formation

[9722646] Nagel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，介电光谱的扩展将被实施，以便对“强”玻璃形成物的研究成为可能。将对有序材料进行研究，看看它们是否具有与无序材料相同的复杂反应。最后，将研究玻璃形成液体的低角度散射，以寻找聚类效应。此外，还提出了图案形成的实验。将继续进行早期的摄影和模拟研究，探测一滴液体分裂成两部分附近的界面。此外，还将研究在强电场存在下流体的形状。最后将研究接触线沉降问题，这是一种当部分湿润的液滴在表面干燥时发生的现象。这个更新的项目包含了一系列关于液体在冷却时变得越来越耐流的机制的实验。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。我们将研究各种液体和无序固体中的分子运动，以理解这种玻璃形成现象。这些研究将包括电子探针的行为以及中子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图案形成如何在技术重要的情况下发生的实验。将研究的一种情况是，一滴液体是如何分裂成多块的。还将研究在强电场存在下流体的形状。最后将研究接触线沉降问题，这是一种液滴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. ***