Depression of deintercalation of 4-hydroxy-3-methoxybenzoic acid from Zn2Al layered double hydroxide by direct coating with silica

Ahmed Mohamed El-Toni, Shu Yin, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Organic ultraviolet (UV) ray 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 ray absorbent to the human skin, a typical organic UV absorbent, 4-hydroxy-3-methoxybenzoic acid (HMBA) was intercalated into Zn2Al layered double hydroxide (Zn 2Al-LDHs) by coprecipiation reaction. The problem of deintercalation of organic molecules from LDHs by the anion exchange reaction with carbonate ion could be greatly depressed by forming a protection film of silica on the surface. Zn2Al-LDH/4-hydroxy-3-methoxybenzoic acid was direct coated with silica by means of polymerization technique based on the Stöber method. The deintercalation behavior as well as UV-shielding properties was investigated for coated particles.

Original languageEnglish
Pages (from-to)3149-3152
Number of pages4
JournalMaterials Letters
Issue number25
Publication statusPublished - 2004 Oct


  • Coating
  • Deintercalation
  • Layered double hydroxide
  • Seeded polymerization
  • Silica
  • Ultraviolet absorbent

ASJC Scopus subject areas

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

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