Transport in Nanoporous Materials Including MOFs: The Applicability of Fick's Laws.
Transport in Nanoporous Materials Including MOFs: The Applicability of Fick's Laws.
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DOI：
10.1002/anie.201506954
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发表时间：
2015-11
影响因子：
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通讯作者：
T. Titze;Alexander Lauerer;L. Heinke;C. Chmelik;Nils E. R. Zimmermann;F. Keil;D. Ruthven;J. Kärger
中科院分区：
文献类型：
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作者：
T. Titze;Alexander Lauerer;L. Heinke;C. Chmelik;Nils E. R. Zimmermann;F. Keil;D. Ruthven;J. Kärger
纳米孔主客体体系中的扩散通常被认为过于复杂，不符合菲克第一和第二扩散定律这样的“简单”关系。然而，本文表明，扩散测量的微观技术，特别是核磁共振波谱的脉冲场梯度（PFG）技术和干涉显微镜（IFM）和红外显微镜（IRM）的微成像技术，为菲克定律适用于这些系统提供了直接的实验证据。在许多情况下，即使详细的机制很复杂，这也是正确的。本文还参考有关扩散模型的大量文献，讨论了扩散模型的局限性。
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.