Interfacial Phenomena Near Critical Points

临界点附近的界面现象

• 批准号: 9631133
• 负责人: Bruce Law
• 金额: $ 31.7万
• 依托单位: Kansas State University
• 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: 1997-03-01 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9631133&HistoricalAwards=false
• 关键词: Interfacial; Phenomena; Near; Critical; Points

w:\awards\awards96\*.doc 9631133 Law This experimental research project is concerned with surface phenomena of adsorption and wetting, which play an important role in many physical, chemical, and biological processes. The research is based on a recently developed ellipsometric microscope. This instrument, developed in the PI's laboratory, will be used to determine size and shape of droplets under experimental conditions. The data will be compared with appropriate theoretical models. This study will enhance our understanding of how uniform wetting layers form via droplet growth and coalescence, how ions in the solution influence the phenomena of wetting and adsorption, and will clarify whether or not orientational order is important at the surfaces of critical ionic mixtures. %%% The composition at the surface of a solution frequently differs from that in the bulk because surface interactions create an adsorbed layer or a wetting layer at the interface. These surface effects are important in many processes such as lubrication, catalysis, and fluid flow, through biological membranes and porous media. The work will use an ellipsometric microscope to study the dynamics of coalescence and growth as wetting droplets combine to form a uniform wetting film at the surface of a critical non-ionic binary liquid mixture. The dynamics will be studied as the temperature is varied. The influence of ions will also be studied. This work will enhance our understanding of the complex interplay between bulk critical phenomena and surface processes, in the presence and absence of ions in solution. ***

w：\awards\awards96\*.doc 9631133法律 本实验研究项目涉及吸附和润湿的表面现象，这些现象在许多物理、化学和生物过程中起着重要作用。这项研究是基于最近开发的椭偏显微镜。该仪器由PI实验室开发，将用于在实验条件下确定液滴的大小和形状。这些数据将与适当的理论模型进行比较。这项研究将提高我们的理解如何形成均匀的润湿层，通过液滴生长和聚结，如何在溶液中的离子影响润湿和吸附的现象，并将澄清是否取向顺序是重要的临界离子混合物的表面。 %溶液表面的组成通常与本体中的组成不同，因为表面相互作用在界面处产生吸附层或润湿层。这些表面效应在许多过程中是重要的，如润滑，催化，流体流动，通过生物膜和多孔介质。 这项工作将使用椭圆偏光显微镜研究的动态聚结和增长的润湿液滴联合收割机结合，形成一个均匀的润湿膜在表面上的一个关键的非离子二元液体混合物。随着温度的变化，将研究动态。还将研究离子的影响。这项工作将提高我们的理解，在溶液中的离子的存在和不存在下，体临界现象和表面过程之间的复杂的相互作用。 ***