Direct coating for layered double hydroxide/4,4′-diaminostilbene-2, 2′-disulfonic acid nanocomposite with silica by seeded polymerization technique

Ahmed Mohamed El-Toni, Shu Yin, Tsugio Sato

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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 rays absorbent by the human skin, an organic UV absorbent such as 4,4′-diaminostilbene-2,2′-disulfonic acid (DASDSA) was intercalated into Zn2Al-layered double hydroxide (Zn2Al-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/DASDSA was directly coated with silica by means of a polymerization technique based on the Stöber method. The deintercalation behavior as well as UV-shielding properties were investigated for coated particles.

Original languageEnglish
Pages (from-to)3197-3201
Number of pages5
JournalJournal of Solid State Chemistry
Volume177
Issue number9
DOIs
Publication statusPublished - 2004 Sep 1

Keywords

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

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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