Structural Properties of Weakly-Adsorbed Overlayers

弱吸附覆盖层的结构特性

• 批准号: 9819977
• 负责人: Renee Diehl
• 金额: $ 27万
• 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: 1999
• 资助国家: 美国
• 起止时间: 1999-05-15 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819977&HistoricalAwards=false
• 关键词: Structural; Properties; Weakly; Adsorbed; Overlayers

9819977DiehlLow-energy electron diffraction and He-atom scattering experiments will be carried out to study the adsorption geometries of adsorbed atoms on nominally flat and vicinal crystalline surfaces, and to characterize the adsorption of weakly-adsorbed atoms on quasicrystalline surfaces. This research program centers on increasing our understanding of the fundamental interactions and properties which give rise to the equilibrium structures of simple adsorbates, and the phase transitions which are peculiar to low-dimensional systems. It also aims to increase our understanding of the properties of the quasicrystalline structure which give rise to the unusual properties of quasicrystals, such as low friction coefficients and high hardness, properties which are important to the development of wear-resistant coatings in machines and tools. This research program includes the participation of postdoctoral researchers, graduate and undergraduate researchers, as well as two faculty from primarily-undergraduate institutions. It includes a significant component of collaborative research with researchers in the UK and Finland. %%%Experiments will be carried out to study the structures and other physical properties of layers of atoms on crystalline and quasicrystalline surfaces. Quasicrystals are a relatively new type of solid which appear to have particularly hard, slippery surfaces. The origin of these unusual physical properties is not well understood. Part of this research involves the study of clean quasicrystal surfaces and the growth of two-dimensional quasicrystalline layers in order to identify the properties of the quasicrystalline sold which give rise to these unusual physical properties. Understanding these properties will facilitate the development of new materials such as wear-resistant coatings in machines and tools. This research program includes the participation of postdoctoral researchers, graduate and undergraduate researchers, as well as two faculty from primarily-undergraduate institutions. It includes a significant component of collaborative research with researchers in the UK and Finland.***

将进行低能电子衍射和he原子散射实验，研究吸附原子在名义平面和相邻晶面上的吸附几何形状，并表征弱吸附原子在准晶面上的吸附。这个研究项目的中心是增加我们对基本相互作用和性质的理解，这些相互作用和性质导致了简单吸附物的平衡结构，以及低维系统特有的相变。它还旨在增加我们对准晶结构特性的理解，准晶结构产生了准晶的不寻常特性，如低摩擦系数和高硬度，这些特性对机械和工具耐磨涂层的发展非常重要。该研究项目包括博士后研究人员、研究生和本科生研究人员，以及来自初级本科院校的两名教师的参与。它包括与英国和芬兰的研究人员合作研究的重要组成部分。将进行实验来研究晶体和准晶体表面原子层的结构和其他物理性质。准晶体是一种相对较新的固体，其表面似乎特别坚硬、光滑。这些不寻常的物理性质的起源还没有得到很好的理解。本研究的一部分涉及清洁准晶体表面的研究和二维准晶体层的生长，以确定准晶体的性质，这些性质导致了这些不寻常的物理性质。了解这些特性将有助于新材料的开发，如机器和工具中的耐磨涂层。该研究项目包括博士后研究人员、研究生和本科生研究人员，以及来自初级本科院校的两名教师的参与。它包括与英国和芬兰研究人员合作研究的重要组成部分