首页> 外文学位 >Structural, electronic, vibrational and thermodynamical properties of surfaces and nanoparticles.
【24h】

Structural, electronic, vibrational and thermodynamical properties of surfaces and nanoparticles.

机译:表面和纳米颗粒的结构,电子,振动和热力学性质。

获取原文
获取原文并翻译 | 示例

摘要

The main focus of the thesis is to have better understanding of the atomic and electronic structures, vibrational dynamics and thermodynamics of metallic surfaces and bi-metallic nanoparticles (NPs) via a multi-scale simulational approach. The research presented here involves the study of the physical and chemical properties of metallic surfaces and NPs that are useful to determine their functionality in building novel materials. The study follows the "bottom-up" approach for which the knowledge gathered at the scale of atoms and NPs serves as a base to build, at the macroscopic scale, materials with desired physical and chemical properties. We use a variety of theoretical and computational tools with different degrees of accuracy to study problems in different time and length scales. Interactions between the atoms are derived using both Density Functional Theory (DFT) and Embedded Atom Method (EAM), depending on the scale of the problem at hand. For some cases, both methods are used for the purpose of comparison. For revealing the local contributions to the vibrational dynamics and thermodynamics for the systems possessing site-specific environments, a local approach in real-space is used, namely Real Space Green's Function method (RSGF). For simulating diffusion of atoms/clusters and growth on metal surfaces, Molecular Statics (MS) and Molecular Dynamics (MD) methods are employed.
机译:本文的主要重点是通过多尺度模拟方法更好地了解金属表面和双金属纳米颗粒(NPs)的原子和电子结构,振动动力学和热力学。本文介绍的研究涉及对金属表面和NP的物理和化学性质的研究,这对于确定其在构建新型材料中的功能很有用。该研究遵循“自下而上”的方法,在该方法中,在原子和NPs规模上收集的知识可作为在宏观规模上构建具有所需物理和化学性质的材料的基础。我们使用各种具有不同准确度的理论和计算工具来研究不同时间和长度范围内的问题。原子之间的相互作用使用密度泛函理论(DFT)和嵌入式原子方法(EAM)来推导,具体取决于当前问题的规模。在某些情况下,两种方法都用于比较。为了揭示具有特定位置环境的系统对振动动力学和热力学的局部贡献,使用了一种在实空间中的局部方法,即“实空间格林函数法”(RSGF)。为了模拟原子/团簇的扩散以及在金属表面上的生长,采用了分子静态(MS)和分子动力学(MD)方法。

著录项

  • 作者

    Yildirim, Handan.;

  • 作者单位

    University of Central Florida.;

  • 授予单位 University of Central Florida.;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 523 p.
  • 总页数 523
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号