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Colloidal Structure-directing-agent-free Hydroxy-sodalite Nanocrystals

J.F. Yao and H.T. Wang
Monash University, AU

Keywords:
zeolites, nanocrystals, silicalite, sodalite

Abstract:
This presentation describes a unique approach to the synthesis of colloidal structure-directing-agent-free hydroxy-sodalite nanocrystals by using silicalite nanocrystals as a silica source.
Under the aid of TPAOH molecules trapped in the dried silicalite nanocrystals, the silicalite nanocrystals undergo the structure transformation into dispersible hydroxy-sodalite nanocrystals without substantial change in the morphologies. The average crystal size of the resulting hydroxy-sodalite nanocrystals (e.g., 60 nm) is somewhat smaller than that of their starting silicalite nanocrystals (e.g., 80 nm). Our studies show that those trapped TPAOH molecules serve as a temporary barrier and effectively confine the zeolite transformation. Elemental analysis indicates that no TPAOH molecules were enclosed in the hydroxy-sodalite nanocrystals. The approach presented here provides a new insight into understanding zeolite crystallization and transformation, and represents a facile way to the synthesis of sodalite nanocrystals

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