脉冲场梯度
纳米孔
扩散
光谱学
分子扩散
显微镜
干涉显微镜
纳米技术
领域(数学)
化学物理
材料科学
化学
物理
热力学
光学
经济
公制(单位)
量子力学
数学
纯数学
运营管理
作者
Tobias Titze,Alexander Lauerer,Lars Heinke,Christian Chmelik,Nils Zimmermann,Frerich J. Keil,Douglas M. Ruthven,Jörg Kärger
标识
DOI:10.1002/anie.201506954
摘要
Diffusion in nanoporous host-guest systems is often considered to be too complicated to comply with such "simple" relationships as Fick's first and second law of diffusion. However, it is shown herein that the microscopic techniques of diffusion measurement, notably the pulsed field gradient (PFG) technique of NMR spectroscopy and microimaging by interference microscopy (IFM) and IR microscopy (IRM), provide direct experimental evidence of the applicability of Fick's laws to such systems. This remains true in many situations, even when the detailed mechanism is complex. The limitations of the diffusion model are also discussed with reference to the extensive literature on this subject.
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