Dense silica coating of titania nanoparticles by seeded polymerization technique

Ahmed Mohamed El-Toni, Shu Yin, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Titania is of potential interest as an ultraviolet (UV) radiation blocking material in personal care products because of its excellent UV light absorption property. Its high photocatalytic activity, however, facilitates the generation of reactive oxygen species, which can oxidize and degrade other ingredients during its formulation, raising safety concerns. Coating of titania nanoparticles with a silica layer could help in depression of their photocatalytic activity by disturbing the formation of radicals produced by the reaction of oxygen and/or water with the electron-hole pair. Titania nanoparticles were coated with amorphous silica using a seeded polymerization technique. The silica shell was confirmed by TEM, electron probe microanalysis (EPMA), and FT-IR. The photocatalytic activity was evaluated for the coated powder to investigate the efficiency of silica coating as well.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number1-3
Publication statusPublished - 2006 Feb 15


  • Photocatalytic activity
  • Seeded polymerization
  • Silica coating
  • Titania nanoparticles

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


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