Preparation of Silica-Coated Polystyrene Hybrid Spherical Colloids

✍ Scribed by Min Chen; Shuxue Zhou; Limin Wu; Songhai Xie; Ying Chen

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 298 KB
• Volume: 206
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200500200

✦ Synopsis

Abstract

Summary: A novel preparation method for stable PS/SiO~2~ core‐shell hybrid colloid was proposed. In this process, a positively charged PS colloid was first synthesized via surfactant‐free emulsion polymerization of styrene by using a cationic initiator, and the hydrolysis and condensation of tetraethoxysilane (TEOS) was then carried out in acidic aqueous ethanol medium in the presence of PS colloids. Silica layer was deposited onto the surface of PS particle via electrostatic interaction between positively charged PS colloids and negatively charged silica. No surface treatment and centrifugation/redispersion cycle process were needed. TEM, SEM, and zeta potential measurements indicated that silica layer was successfully coated onto the surfaces of PS colloids.

PS/SiO~2~ hybrid core‐shell colloids with PS as core and silica layer as shell.

imagePS/SiO~2~ hybrid core‐shell colloids with PS as core and silica layer as shell.