Modeling spontaneous formation of precursor nanoparticles in clear-solution zeolite synthesis

M Jorge, S M Auerbach, P A Monson

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)
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Abstract

We present a lattice model describing the formation of silica nanoparticles in the early stages of the clear-solution templated synthesis of silicalite-1 zeolite. Silica condensation/hydrolysis is modeled by a nearest-neighbor attraction, while the electrostatics are represented by an orientation-dependent, short-range interaction. Using this simplified model, we show excellent qualitative agreement with published experimental observations. The nanoparticles are identified as a metastable state, stabilized by electrostatic interactions between the negatively charged silica surface and a layer of organic cations. Nanoparticle size is controlled mainly by the solution pH, through nanoparticle surface charge. The size and concentration of the charge-balancing cation are found to have a negligible effect on nanoparticle size. Increasing the temperature allows for further particle growth by Ostwald ripening. We suggest that this mechanism may play a role in the growth of zeolite crystals.

Original languageEnglish
Pages (from-to)14388-14400
Number of pages13
JournalJournal of the American Chemical Society
Volume127
Issue number41
Early online date27 Sep 2005
DOIs
Publication statusPublished - 19 Oct 2005

Keywords

  • zeolite crystals
  • nanoparticles
  • nanoparticle size
  • silica nanoparticles

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