Relaxation Dynamics in Glassy Systems and Pattern Formation

玻璃系统中的弛豫动力学和模式形成

• 批准号: 9722646
• 负责人: Sidney Nagel
• 金额: $ 30万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-15 至 2001-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9722646&HistoricalAwards=false
• 关键词: Relaxation; Dynamics; Glassy; Systems; Pattern

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. ***

9722646内格尔 该更新项目包括一系列关于过冷液体动力学的实验。 特别是，介电谱的扩展将被实施，以便调查“强”玻璃形成者可以成为可能。 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，将有一个小角散射的玻璃形成液体的研究，以寻找集群效应。 此外，还提出了图案形成的实验。 将继续早期的摄影和模拟研究，探测一滴液体分裂成两个独立部分的界面附近。 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，这是一种当部分润湿的液滴在表面上干燥时发生的现象。 这个更新项目包含一系列关于液体在冷却时变得越来越难以流动的机理的实验。 如果充分冷却，它将形成分子运动高度受限的玻璃。 我们将研究各种液体和无序固体中的分子运动，以了解这种玻璃形成现象。 这些研究将包括行为的电子探针以及中子和同步加速器源的使用。 此外，还提出了实验来研究在技术重要的情况下如何使用高速摄影和数值模拟来研究图案的形成。 我们将研究的一种情况是一滴液体如何分裂成多个部分。 也将有一个调查的形状的流体中存在的一个强电场。 最后将研究接触线沉降问题，这是一种每当一滴液体在表面上干燥时就会发生的现象。 ***