Particle Dynamics in Nano-Structured Channels

纳米结构通道中的粒子动力学

• 批准号: 58201332
• 负责人: Professor Dr. Jörg Kärger
• 金额: --
• 依托单位: Abteilung Grenzflächenphysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/58201332?language=en
• 关键词: Particle; Dynamics; Nano; Structured; Channels

The present project will be concerned with the experimental study of various aspects of molecular dynamics under artificially designed nanoconfmements with complex controlled geometries using the PFG NMR method and their further theoretical quantification. These studies will mainly be focused on elucidating the changes in the elementary mechanisms of microscopic dynamics due to a superimposed confinement of a predefined geometry leading to transient and anomalous patterns in the molecular propagation under equilibrium and nonequilibrium conditions. In particular, dynamics of both chain- and spheric-like molecules in channels of comparable diameters and modulated pore morphology will be investigated. In this way, non-Fickian local dynamics emerging from transient single-file to free diffusion and from complex hydrodynamic effects will be studied. In order to complement single-molecule tracking studies, the following problems will also be addressed with the aid of the NMR technique: (i) internal dynamics of semiconfmed (grafted) polymer molecules; (ii) diffusion in controlled inhomogeneous landscapes; (iii) anomalous patterns in sequential 2D-3D diffusion processes.

本项目将关注使用PFG NMR方法在人工设计的具有复杂受控几何形状的纳米材料下进行分子动力学各个方面的实验研究及其进一步的理论量化。这些研究将主要集中在阐明微观动力学的基本机制的变化，由于一个预定义的几何形状的叠加限制导致瞬态和异常模式的分子传播在平衡和非平衡条件下。特别是，链和球状分子在通道的直径相当，调制孔形态的动态将进行研究。通过这种方式，将研究从瞬态单列到自由扩散以及从复杂的流体动力学效应中出现的非菲克局部动力学。为了补充单分子追踪研究，还将借助核磁共振技术解决以下问题：（i）半形成（接枝）聚合物分子的内部动力学;（ii）受控不均匀景观中的扩散;（iii）序列中的异常模式2D-3D扩散过程。