title: Immobilization of Xanthate Agent on Titanium Dioxide and Surface Initiated RAFT Polymerization.
abstract: Surface modification of titanium dioxide (TiO2) nanoparticle is essential to control its surface properties, thereby to enhance its cell penetration capability, reduce its cytotoxicity, or improve its biocompatibility. In order to graft polyvinyl acetate onto TiO2nanoparticles, xanthate was chemically immobilized on the surface of TiO2by acylation followed by nucleophilic substitution with a carbodithioate salt. Reversible addition fragmentation chain transfer polymerization was conducted to graft vinyl acetate onto the surface of TiO2. Both the TiO2-xanthate and TiO2-polyvinyl acetate hybrids were characterized by UV-Vis spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The chemical immobilization of xanthate on the surface of TiO2and the subsequent controlled polymerization provide useful insight for decoration and modification of TiO2and other nanoparticles.
authors.affiliation: College of Dentistry, Howard University, Washington DC ; Crest Center for Nanomaterials, College of Engineering, Howard University, Washington DC.
authors.forename: Yanda
authors.initials: Y
authors.lastname: Lei
authors.affiliation: College of Dentistry, Howard University, Washington DC ; Crest Center for Nanomaterials, College of Engineering, Howard University, Washington DC.
authors.forename: Tongxin
authors.initials: T
authors.lastname: Wang
authors.affiliation: Crest Center for Nanomaterials, College of Engineering, Howard University, Washington DC.
authors.forename: James W
authors.initials: JW
authors.lastname: Mitchell
authors.affiliation: American Dental Association Foundation, Dr. Anthony Volpe Research Center, National Institute of Standards and Technology, MD, USA.
authors.forename: Laurence C
authors.initials: LC
authors.lastname: Chow
keywords: RAFT polymerization; Surface grafting; titanium dioxide; xanthate