Synthesis of rutile titania powders: Agglomeration, dissolution, and reprecipitation phenomena

Sascha M. Klein, Joon Hwan Choi, David J. Pine, Fred F. Lange

Research output: Contribution to journalArticlepeer-review

Abstract

Rutile titania powders were synthesized via a sol-gel/hydrothermal process using nitric acid as the catalyst. A molar acid to alkoxide ratio of 10 and a water to alkoxide molar ratio of 250 produced 100% rutile powders when precipitated below 45 °C. Higher temperatures yielded initially either anatase or mixtures of anatase and rutile. Spherulitic growth produced cauliflower-shaped agglomerates with a mean size of 760 nm. The agglomerates could be broken apart into approximately 100-nm large broomlike agglomerates via a dissolution and reprecipitation process when reacted with approximately 2.4 molar nitric acid. Transmission electron microscopy observations snowed that the broomlike agglomerate consisted of linear clusters of rodlike agglomerates composed of crystallographically aligned, primary particles approximately 4 nm in size.

Original languageEnglish (US)
Pages (from-to)1457-1464
Number of pages8
JournalJournal of Materials Research
Volume18
Issue number6
DOIs
StatePublished - Jun 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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