Mass Transport in Nanoporous Materials: New Insights from Micro-Imaging by Interference Microscopy
Mass Transport in Nanoporous Materials: New Insights from Micro-Imaging by Interference Microscopy
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纳米多孔材料中的传质：干涉显微镜显微成像的新见解
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发表时间：
2013
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通讯作者：
Tomas Binder
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作者：
Tomas Binder
Binder, Tomas Mass Transport in Nanoporous Materials: New Insights from Micro-Imaging by Interference Microscopy Universität Leipzig, Dissertation, 2013 91 页，125 篇参考文献，12 个表格，51 张图 本论文介绍了通过微成像在纳米多孔主体系统中进行扩散测量的最新进展。干涉显微镜被用作记录两种不同沸石（即沸石）多孔框架中不同山梨酸盐种类的瞬态、晶内浓度分布的有力工具。 ZSM-5 (MFI) 和 ZSM-58 (DDR)。这些轮廓产生约 10 s 和 0.45 μm 的高时间和空间分辨率，遵循主客体系统在吸收和释放某些客体分子期间折射率的变化。通过浓度和颗粒通量的可实现变化，可以通过使用非常基本的扩散方程来获得质量传递参数，例如晶内扩散率和表面渗透率。此外，在两个以前从未进行过的实验类型的例子中，提供了对主客体相互作用的挑战性领域的进一步见解：在单晶研究中研究了覆盖高苯负载的 MFI 型沸石中众所周知的相变，从而可以非常详细地跟踪山梨酸盐相的变化。此外，在 DDR 沸石中，一种新的数据分析方法有助于研究二元混合物的吸收和释放。在这里，从干涉显微镜获得的二维分布中，可以使用所谓的理想吸附溶液理论来检索山梨酸盐物质的局部浓度。
Binder, Tomas Mass Transport in Nanoporous Materials: New Insights from Micro-Imaging by Interference Microscopy Universität Leipzig, Dissertation, 2013 91 pages, 125 references, 12 tables, 51 figures This thesis presents the recent progress of diffusion measurements in nanoporous host systems by micro-imaging. Interference microscopy is applied as a powerful tool to record transient, intracrystalline concentration profiles of different sorbate species in the porous framework of two different zeolites, viz. ZSM-5 (MFI) and ZSM-58 (DDR). These profiles, yielding high temporal and spatial resolutions of about 10 s and 0.45 μm, follow the change of the refractive index of the host-guest system during uptake and release of certain guest molecules. With the thus accessible changes of concentration and particle fluxes, mass transport parameters, such as intracrystalline diffusivity and surface permeability, can be obtained by the use of the very fundamental equations on diffusion. Additionally, in two examples of never before performed types of experiments, further insights into challenging fields of host-guest interactions are provided: The well known phase transition in MFI type zeolites covering high benzene loadings is investigated in a single crystal study, allowing to follow the change of the sorbate phase in great detail. Furthermore, in DDR zeolites, a new way of data analysis facilitates to study the uptake and release of binary mixtures. Here, from the two-dimension profiles obtained by interference microscopy, the local concentrations of the sorbate species could be retrieved by using the so-called ideal adsorbed solution theory.