Wetting and Superfluidity on Weak and Intermediate Strength Substrates

弱和中等强度基材的润湿和超流动性

• 批准号: 9971519
• 负责人: Peter Taborek
• 金额: $ 91万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-15 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9971519&HistoricalAwards=false
• 关键词: Wetting; Superfluidity; Weak; Intermediate; Strength

9971519TaborekThis is a low temperature physics project to study the properties of quantum fluids that weakly physisorbed on metal surfaces. A principal goal is to exploit the tunability of alkali metal substrates to study the interaction of prewetting and superfluidity, and to study superfluid onset on substrates of controlled strength and randomness. In analogy to the metal-insulator transition, the project seeks to identify substrates which span the range from supporting a highly localized Bose glass to those which serve as extremely weak and uniform substrates with no localized atoms. The experiments employ measurement of adsorption isotherms using microbalances, with particular attention to development of longitudinal mode oscillators which are sensitive to both the super and normal fractions. The research provides exceptional opportunities for graduate students to investigate fundamental issues in quantum fluids, and to gain experience in the development of new instrumentation.%%%This low temperature physics project investigates the unusual properties of quantum fluids, principally helium, but also hydrogen, that condense in monolayer films on various metal surfaces. The research involves experiments of superfluidity on unusual substrates with very weak interactions. This experimental system provides extremely clean tests of our understanding of fluids interacting with a wall. This is important for issues ranging from lubrication to crystal growth. We will also exploit the many analogies between superfluidity and superconductivity to gain insight into both types of behavior. Novel types of silicon micromachined oscillators will be developed which can detect single layers of adsorbed atoms. The research provides exceptional opportunities for graduate students to investigate fundamental issues in quantum fluids, and to gain experience in the development of new instrumentation.

9971519 Taborek这是一个低温物理项目，旨在研究在金属表面上弱物理吸附的量子流体的性质。一个主要的目标是利用碱金属基板的可调性研究预润湿和超流的相互作用，并研究超流的控制强度和随机性的基板上的发病。与金属-绝缘体过渡类似，该项目旨在确定从支持高度局部化的玻色玻璃到作为没有局部化原子的极弱和均匀衬底的衬底。实验采用测量吸附等温线使用微量天平，特别注意纵向模式振荡器的发展是敏感的超级和正常的分数。这项研究为研究生提供了研究量子流体基本问题的绝佳机会，并获得了开发新仪器的经验。%这个低温物理项目研究量子流体的不寻常特性，主要是氦，但也包括氢，它们在各种金属表面上凝结成单层膜。这项研究涉及在具有非常弱相互作用的不寻常基质上进行超流性实验。这个实验系统为我们理解流体与壁的相互作用提供了非常清晰的测试。这对于从润滑到晶体生长的问题都很重要。我们也将利用超流性和超导性之间的许多类比来深入了解这两种行为。新型的硅微机械振荡器将被开发出来，它可以检测单层吸附原子。这项研究为研究生提供了研究量子流体基本问题的绝佳机会，并获得了开发新仪器的经验。