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Studies of Physical Adsorption

物理吸附研究

基本信息

批准号：
9022681
负责人：
Moses Chan
金额：
$ 189.23万
依托单位：
Pennsylvania State Univ University Park
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1991
资助国家：
美国
起止时间：
1991-09-15 至 1998-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9022681&HistoricalAwards=false
关键词：
Studies Physical Adsorption

项目摘要

A new Materials research Group is established to investigate fundamental aspects of physical adsorption and phase transitions in physisorbed films. The goals of the research are to study both the structure and kinetics of physisorbed films, and the nature of these phases and the transitions between them. The research is organized into five topics: (1) melting of monolayer argon films on graphite, (2) phase transitions of films of binary adsorbates, (3) properties of simple gases in a well- characterized zeolite porous medium, (4) unusual properties of monolayer and multilayer helium films on weak-binding substrates, (5) desorption and helium atom scattering of films. Experimental efforts include measurement of heat capacity, in-situ vapor pressure isotherm study, inelastic helium scattering, high- resolution low-energy electron diffraction, inelastic helium scattering, neutron scattering, time-of-flight desorption measurements, and wetting and superfluid studies. Molecular dynamics computer simulation is being used to provide realistic modelling of adsorbate behavior and phase transitions of thin films and confined fluids. Interaction potentials, atom-surface scattering, and classical and quantum transitions of adsorbate systems are being studied in the theoretical thrusts of the program using potential energy models and statistical mechanics approaches. The strong coupling of experiment, computational simulation and theory are making advances not possible by isolated approaches.

成立新材料研究组，物理吸附和相变的基本方面在物理吸附薄膜中。研究的目的是研究物理吸附膜的结构和动力学，这些阶段的性质以及它们之间的过渡。的研究分为五个方面：（1）单分子膜的熔化石墨上的氩膜，（2）薄膜的相变，二元吸附质，（3）井中简单气体的性质- 特征沸石多孔介质，（4）不寻常的性质，在弱结合衬底上的单层和多层氦膜， (5)膜的解吸和氦原子散射。实验这些努力包括测量热容量、原位蒸汽压力等温线研究，氦非弹性散射，高- 分辨低能电子衍射，非弹性氦原子散射，中子散射，飞行时间解吸测量，润湿和超流体研究。分子动力学计算机模拟被用来提供逼真的吸附物行为和相变的模拟薄膜和受限流体。原子-表面相互作用势散射以及吸附质的经典跃迁和量子跃迁系统正在研究的理论推力的使用势能模型和统计力学的程序接近。实验、计算模拟和理论正在使进步不可能，孤立的方法。