Yao J.F., Wang H.T.
Monash University, AU
Keywords: nanocrystals, silicalite, sodalite, zeolites
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
Journal: TechConnect Briefs
Volume: 1, Technical Proceedings of the 2006 NSTI Nanotechnology Conference and Trade Show, Volume 1
Published: May 7, 2006
Pages: 439 - 442
Industry sector: Advanced Materials & Manufacturing
Topic: Nanoparticle Synthesis & Applications
ISBN: 0-9767985-6-5