Modeling silica nanoparticle dissolution in TPAOH-TEOS-H2O solutions

John L. Provis, John D. Gehman, Claire Emily White, Dionisios G. Vlachos

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

A model previously developed for the description of silica nanoparticle formation in the TPAOH-TEOS-H2O system, as a preliminary step in the clear-solution synthesis of silicalite-1, is here applied to nanoparticle dissolution. The model is found to give a reasonable description of the dissolution process of as-synthesized nanoparticles. Nanoparticles heated to 70 °C have previously been observed to develop increased structural ordering, and this is incorporated into the model in a way that correlates directly with new 29Si NMR data presented here. Dissolution of both as-synthesized and heated nanoparticles in alkaline solutions at different temperatures was modeled using activation energies obtained from the literature. Structural evolution occurring upon heating and dissolution of nanoparticles and/or spatial heterogeneity in nanoparticle ordering is apparent.

Original languageEnglish (US)
Pages (from-to)14769-14775
Number of pages7
JournalJournal of Physical Chemistry C
Volume112
Issue number38
DOIs
StatePublished - Sep 25 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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