Diffusion in nanopores: correlating experimental findings with “first-principles” predictions
Diffusion in nanopores: correlating experimental findings with “first-principles” predictions
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DOI：
10.1007/s10450-020-00237-0
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
S. Hwang;J. Kärger
中科院分区：
文献类型：
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作者：
S. Hwang;J. Kärger
在纳米多孔主体材料中的分子扩散的测量通常是不均匀的和各向异性的，通常涉及要考虑的因素和关系的复杂网络，因为相关的扩散率是在给定的观察时间期间客体分子的扩散路径的函数。因此，根据观测时间的不同，实验测量的结果可能会对潜在的扩散现象得出完全不同的结论。如果可以选择将实验数据与完全独立的测量结果进行比较，则可以降低将实验数据与不相关的现象相关联而导致错误解释的风险。本通信解决了这个问题，参考脉冲场梯度NMR和红外显微镜显微成像的微观扩散测量技术的特殊潜力。
Measurement of molecular diffusion in nanoporous host materials, which are typically inhomogeneous and anisotropic, often involves an intricate web of factors and relations to be taken into account since the associated diffusivities are a function of the diffusion path of the guest molecules during a given observation time. Depending on the observation time, therefore, the result of the experimental measurement can point to completely different conclusions about the underlying diffusion phenomena. The risk of misinterpretation of the experimental data, by correlating them with irrelevant phenomena, may be reduced if there is an option to compare the data with the results of totally independent measurements. The present communication addresses this issue with reference to the particular potentials of pulsed field gradient NMR and microimaging by infrared microscopy as techniques of microscopic diffusion measurement.