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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Investigations of the Structure and Hydrogen Bonding of Water Molecules at Liquid Surfaces by Vibrational Sum Frequency Spectroscopy
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Investigations of the Structure and Hydrogen Bonding of Water Molecules at Liquid Surfaces by Vibrational Sum Frequency Spectroscopy

机译：振动和谱法研究液体表面水分子的结构和氢键

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摘要

The structure and hydrogen bonding of water molecules provides this unique solvent with properties essential to many physical, chemical, and biological processes. The intermolecular hydrogen bonding between water molecules in the bulk medium is disrupted at the surface, imparting the surface with unique structural and thermodynamic properties. We provide an overview of a range of experimental studies from this laboratory in which the structure, orientation, and hydrogen bonding of interfacial water molecules at liquid interfaces are directly probed by resonant vibrational sum frequency spectroscopy. The studies provide insight into the difference in water structure and hydrogen bonding at an air/water interface relative to the interface between two bulk immiscible liquids, namely the CCl_4/H_2O interface. Also described are studies aimed at understanding how the presence of a charged alkyl surfactant alters the structures of water at these two interfaces. In both cases field-induced alignment of water molecules in the double layer region is prevalent. This induced alignment has been examined under a variety of experimental conditions. A series of isotopic dilution studies conducted for the first time at liquid surfaces are also described. In these studies the intermolecular and intramolecular coupling of vibrational modes in the water molecules are diminished. The results of these and above-mentioned studies provide valuable information for those interested in developing theoretical descriptions of water at surfaces and interfaces.
机译：水分子的结构和氢键为这种独特的溶剂提供了许多物理，化学和生物过程必不可少的特性。散装介质中水分子之间的分子间氢键在表面被破坏，赋予表面独特的结构和热力学性质。我们提供了来自该实验室的一系列实验研究的概述，其中通过共振振动和频率光谱法直接探测了液体界面处的界面水分子的结构，取向和氢键。这些研究提供了对空气/水界面相对于两种本体不混溶液体之间的界面（即CCl_4 / H_2O界面）的水结构和氢键的差异的见解。还描述了旨在了解带电烷基表面活性剂的存在如何改变这两个界面处水结构的研究。在这两种情况下，在双层区域中水分子的场致取向都是普遍的。已经在各种实验条件下检查了这种诱导的比对。还介绍了首次在液体表面进行的一系列同位素稀释研究。在这些研究中，减少了水分子中振动模式的分子间和分子内耦合。这些和上述研究的结果为那些对开发表面和界面处水的理论描述感兴趣的人提供了有价值的信息。

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