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 language | English |
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Pages (from-to) | 449-454 |
Number of pages | 6 |
Journal | Journal of Colloid And Interface Science |
Volume | 293 |
Issue number | 2 |
DOIs | |
Publication status | Published - 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