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.

本项目将与使用PFG NMR方法及其进一步的理论定量有关的人工设计的纳米构件，对分子动力学的各个方面进行实验研究。这些研究将主要集中于阐明微观动力学基本机制的变化，这是由于对预定义的几何形状的叠加，导致在平衡和非平衡条件下分子传播中的短暂和异常模式。特别是，将研究可比较直径和调制孔形态的通道中链和球形分子的动力学。这样，将研究从瞬态单文件到自由扩散以及从复杂的流体动力效应中出现的非盲目局部动力学。为了补充单分子跟踪研究，还将借助NMR技术解决以下问题：（i）半浓度（移植）聚合物分子的内部动力学； （ii）受控的不均匀景观的扩散； （iii）顺序2D-3D扩散过程中的异常模式。