Abstract
Continuous films, between 200 and 500 'm thick, built up of monocrystals of silica molecular sieves of the MFI-type on silicon [001] wafer platelets, were prepared. In the proper concentration range and with tetrapropylammonium ions (TPA + ) as the template, a continuous silica gel layer was first formed on the platelet which acted as a precursor phase for the crystallization of a film of laterally oriented crystals. In the case of a mixture of TPA + and Na + ions, separate gel spheres were formed on the platelet resulting in a random orientation of the crystals in the film.
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