Microimaging on the basis of, respectively, interference microscopy and IR microscopy permit the observation of the distribution of guest molecules in nanoporous solids and their variation with time. Thus attainable knowledge of both concentration gradients and diffusion fluxes provides direct access to the underlying diffusion phenomena. This includes, in particular, the measurement of transport diffusion under transient, i. e. under non-equilibrium conditions, and of self- or tracer diffusion on considering the rate of tracer exchange. Correlating the difference in guest concentration close to the external surface to its equilibrium value with the influx into the nanoporous solid, microimaging does as well allow the direct determination of surface resistances. Examples illustrating the variety of information thus attainable include the comparison of mass transfer under equilibrium and non-equilibrium conditions, single- and multicomponent diffusion and chemical reactions. They, finally, introduce into the potentials of microimaging for an in-depth study of mass transfer in mixed-matrix membranes. This tutorial review may serve as first introduction into the topic. Further references are linked for the interested reader.

分别基于干涉显微镜和红外显微镜的显微成像可以观察客体分子在纳米多孔固体中的分布及其随时间的变化。因此，可以获得的浓度梯度和扩散通量知识可直接访问潜在的扩散现象。这尤其包括在瞬态即非平衡条件下的传输扩散的测量，以及考虑示踪剂交换速率的自扩散或示踪扩散。通过将接近外表面的客体浓度差异与其平衡值与流入纳米孔固体的流量相关联，显微成像也可以直接确定表面电阻。举例说明由此可获得的各种信息，包括比较平衡和非平衡条件下的传质，单组分和多组分扩散以及化学反应。最后，他们将显微成像的潜力引入了深入研究混合基质膜传质的潜力。本教程评论可以作为对该主题的首次介绍。有兴趣的读者可以链接更多参考文献。