The growth kinetics of TiO2 nanoparticles from titanium(IV) alkoxide at high water/titanium ratio

Gerko Oskam, Abhinav Nellore, R. Lee Penn, Peter C. Searson

Research output: Contribution to journalArticle

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Abstract

We report on the growth kinetics of TiO2 nanoparticles synthesized from aqueous solution using titanium-(IV) isopropoxide as precursor. The radius of primary particles was found to be between 1.5 and 8 nm, and the average particle radius cubed is shown to increase linearly with time in agreement with the Lifshitz-Slyozov-Wagner model for coarsening. The rate constant for coarsening increases with temperature due to the temperature dependence of the viscosity of the solution and the equilibrium solubility of TiO2. At longer times and higher temperatures, secondary particles formed by epitaxial self-assembly of primary particles were observed with high-resolution transmission electron microscopy. The number of primary particles per secondary particle increases with time, and the percentage of primary particles present in the colloid decreases with increasing temperature.

Original languageEnglish (US)
Pages (from-to)1734-1738
Number of pages5
JournalJournal of Physical Chemistry B
Volume107
Issue number8
DOIs
Publication statusPublished - Feb 27 2003
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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