Nuclei initial-bred

The addition of zeolite seed crystals to hydrothermal synthesis media have long been known to accelerate the crystallization process, and even direct the outcome of syntheses in certain circumstances. The mechanism by which this occurs has been shown to involve very small alumino-silicate fragments in the seed crystal sample, either actually adhering to the seed crystal surfaces, or simply co-existing in the sample. These initial-bred nuclei , as they have been labeled, do not appear to prohibit the nucleation of zeolite crystals which would form in their absence in some cases. However, there are several examples reported in the open Uterature in which the phase formed by the unseeded solution did not form when seeds of another crystalHne phase were added to the solution. An interpretation of these results is provided. 

The question then arose regarding how and when the initial-bred nuclei were formed, and what control one might have over their formation. It has been demonstrated recently [64] that the initial-bred nuclei form in seed-preparation... 

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