X-Ray Studies of Liquids Near Interfaces and in Thin Films

9978597杜塔这是一个同步加速器X射线更新项目，用于研究界面附近液体的分子结构。目的是研究各种简单分子液体在界面附近和薄膜中的结构如何以及在什么条件下偏离这些液体的整体结构。虽然许多证据通常是间接的，表明分子在界面附近分层，但直到最近，在该项目的先前工作中，才用X射线方法直接观察到这种分子分层。我们将研究简单的有机液体和水的薄膜。两者都在一个固体表面上，并夹在两个固体表面之间。垂直于胶片平面和胶片平面内的顺序将使用同步加速器x射线进行探测。观察到的有序性与薄膜厚度、支撑固体表面的性质和温度的关系将得到详细的研究。这项研究将为研究生提供现代衍射方法的优秀培训，并在一个具有基础和应用兴趣的领域。%近表面液体的结构预计在气液界面附近或在其他液体界面处是不同的。然而，该项目直到最近才实现了对这种界面结构的直接X射线结构测定。这项奖励将允许该项目继续进行。从这个项目中获得的知识将有助于确定为什么当液体被限制在板间或被界面约束时，表现不同(不同于主体相)。这可能导致设计特定界面液体性质的方法。这样的理解对于润滑、过滤、三次采油、工业中的润湿和铺展过程以及许多其他技术相关的应用都很重要。这项研究将为研究生提供现代衍射方法的优秀培训，并在一个具有基础和应用兴趣的领域。

9978597Dutta This is a synchrotron x-ray renewal project to investigate the molecular structure of liquids near interfaces. The objective is to study how and under what conditions the structures of various simple molecular liquids deviate near interfaces and in thin films from the structures of these liquids in bulk. While much evidence, generally indirect, suggests that molecules layer near interfaces, it is only recently, during previous work on this project, that this molecular layering has been directly observed with x-ray methods. Thin films of simple organic liquids and water will be studied. both on one solid surface and sandwiched between two solid surfaces. Order normal to film plane and within the film plane will be probed using synchrotron x-rays. The dependence of the observed ordering on the film thickness, the nature of the supporting solid surface, and temperature will be investigate in detail. The research will provide excellent training for graduate students in modern diffraction methods and in an area with both fundamental and applied interest.%%%The structure of liquids near surfaces is expected to be different near air/liquid interfaces or at other liquid interfaces. However, direct x-ray structure determination of this interface structure has only recently been achieved by this project. This award will allow the project to continue. The knowledge gained from this project will help determine why liquids behave differently (from the bulk phase) when confined between plates or constrained by an interface. This could lead to methods to design specific interfacial liquid properties. Such an understanding is important for lubrication, filtration, tertiary oil recovery, wetting and spreading processes in industry, and many other technologically relevant applications. The research will provide excellent training for graduate students in modern diffraction methods and in an area with both fundamental and applied interest.