Silica coating and photochemical properties of layered double hydroxide/4,4′-diaminostilbene-2,2′-disulfonic acid nanocomposite

Ahmed Mohamed El-Toni, Shu Yin, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Organic ultraviolet (UV) rays absorbents have been used as sunscreen materials, but they 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, 4,4′-diaminostilbene-2,2′- disulfonic acid (DASDSA), was intercalated into Zn2Al layered double hydroxide (Zn2Al-LDH) by coprecipitation reaction. However, deintercalation of DASDSA from Zn2Al-LDH, by the anion exchange reaction with carbonate ion, was observed. Therefore, Zn2Al-LDH/ DASDSA was directly coated with silica by means of polymerization technique based on the Stöber method. Silica coating effectively depressed the deintercalation of DASDSA from Zn2Al-LDH. The amorphous silica was confirmed by XRD, SEM, TEM and FT-IR. The deintercalation behaviors as well as UV-shielding properties were investigated for coated particles.

Original languageEnglish
Pages (from-to)449-454
Number of pages6
JournalJournal of Colloid And Interface Science
Volume293
Issue number2
DOIs
Publication statusPublished - 2006 Jan 15

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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