*5.3.2.1. Ordered Mesoporous Materials*

Microporous zeolite thin films were first investigated by Yan and co-workers. [43] These films offer good thermal stability (i.e. no pore collapse or unidirectional shrinkage) and inter-particle mechanical strength. They can be prepared via a simple spin-on method [43,44] or by in situ growth. [44,45] With simple spin-on methods a dispersion of small zeolite particles are prepared and cast onto a surface. The porosity originates from the interparticle porosity within the zeolite nanoparticles and the intraparticle porosity owing to the packing of the near-spherical nanoparticles in thin film format.
