Silica coating of Zn2Al/4-hydroxy-3-methoxybenzoic acid nanocomposites via seeded polymerization technique

Ahmed Mohamed El-Toni, Shu Yin, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Organic ultraviolet (UV) rays absorbents have been used as sunscreen materials, but may pose a safety problem when used at high concentration. In order to prevent direct contact of organic UV-rays absorbent to the human skin a typical organic UV-absorbent, 4-hydroxy3-methoxybenzoic acid (HMBA) was intercalated into Zn2Al layered double hydroxide (Zn 2Al-LDHs) by coprecipiation reaction. But deintercalation of organic molecules from Zn2 Al-LDHs, by the anion exchange reaction with carbonate ion, was observed. Therefore, Zn 2Al-LDH/4-hydroxy-3-methoxybenzoic acid is directly coated with silica by means of polymerization technique based on the Stöber method. Silica coating effectively depress the deintercalation of 4-hydroxy-3-methoxybenzoic acid from Zn2Al-LDHs. The amorphous silica is confirmed by X-ray diffraction, scanning electron microscope and FT-IR. The deintercalation behavior as well as UV-shielding properties is investigated for coated particles.

Original languageEnglish
Pages (from-to)154-158
Number of pages5
JournalMaterials Chemistry and Physics
Issue number1
Publication statusPublished - 2005 Jan 15


  • Coating
  • Composites materials
  • Optical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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