Colloidal structure-directing-agent-free hydroxy-sodalite nanocrystals

Jianfeng Yao, Huanting Wang

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


Our previous work showed that colloidal structure-directing-agent-free hydroxy-sodalite nanocrystals could be synthesized by the direct transformation of silicalite nanocrystals. The structure directing agent TPAOH molecules trapped in the dried silicalite nanocrystals proved to play an important role in confining the structure transformation. In the presence of TPAOH, silicalite nanocrystals reacted with alkaline NaO-Al2O3 aqueous solution and formed hydroxy-sodalite nanocrystals without substantial change in the sizes and morphologies. In this presentation, different colloidal silica sources were used to examine the effect of the crystalline structure of starting nanoparticles. The results indicated that sodalite crystals and a mixture of zeolite A and sodalite crystals were produced, and their sizes ranged from less than 100 nm to a couple of microns when amorphous colloidal silica nanoparticles were used. This again suggests that a combination of silicalite nanocrystals and TPAOH is advantageous for formation of hydroxy-sodalite nanocrystals.

Original languageEnglish
Title of host publication2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings
Number of pages4
Publication statusPublished - 8 Dec 2006
EventNanotechnology Conference and Trade Show (Nanotech) 2006 - Boston, United States of America
Duration: 7 May 200611 May 2006

Publication series

Name2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings


ConferenceNanotechnology Conference and Trade Show (Nanotech) 2006
Abbreviated titleNSTI Nanotech 2006
Country/TerritoryUnited States of America


  • Nanocrystals
  • Silicalite
  • Sodalite
  • Structure directing agent
  • Transformation

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