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

作者：El Toni AM^*; Yin S; Sato T

来源：Journal of Solid State Chemistry, 2004, 177(9): 3197-3201.

DOI：10.1016/j.jssc.2004.04.052

• ultraviolet absorbent
• layered double hydroxide
• silica
• seeded polymerization
• coating
• deintercalation

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 Stober method. The deintercalation behavior as well as UV-shielding properties were investigated for coated particles.

• 出版日期2004-9