Investigation of photocatalytic activity and UV-shielding properties for silica coated titania nanoparticles by solvothermal coating

Ahmed Mohamed El-Toni, Shu Yin, Tsugio Sato, Talal Ghannam, Mansour Al-Hoshan, Mohamed Al-Salhi

Research output: Contribution to journalLetter

28 Citations (Scopus)

Abstract

Due to its excellent UV-rays shielding properties, titanium dioxide can be used in many sunscreen products. However, concerns have been raised about the possible photocatalytic decomposition of cosmetic formulation by titanium dioxide. Therefore, titania nanoparticles were encapsulated in silica shell by using solvothermal process. Both temperature and time parameters of the solvothermal process were optimized to produce silica shell with highest density (loss of micropores) and maximum shell thickness. The coated particles were characterized by X-ray diffraction (XRD), TEM, FTIR, XPS, zeta-potential, and porosity measurements. The photocatalytic activity of the coated samples was suppressed effectively by conducting solvothermal silica coating at 200 °C for 15 h where TEM observations revealed the gradual growth of silica shell around TiO2 nanoparticles. On the other hand, UV-shielding properties were slightly reduced after silica coating which can be attributed to the loss of titania content.

Original languageEnglish
Pages (from-to)L1-L4
JournalJournal of Alloys and Compounds
Volume508
Issue number1
DOIs
Publication statusPublished - 2010 Oct 15

Keywords

  • Core-shell
  • Photocatalytic activity
  • Silica coating
  • Solvothermal
  • UV-shielding properties

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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