Nanoparticles in PAMAM dendrimer containing polyelectrolyte multilayers

POLY 308

Nicole Zacharia, nzach@mit.edu1, Miguel Modestino, mams@mit.edu2, and Paula T. Hammond, hammond@athena.mit.edu2. (1) Department of Materials Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, (2) Department of Chemical Engineering, MIT, 25 Ames Street 66-350, Cambridge, MA 02139-4561
PAMAM dendrimer is well known to chelate metal ions into its interior, which can then be reduced into small, monodisperse nanoparticles contained within the dendrimer. These nanoparticles can be used for the catalysis of reactions, such as hydrogenations. Selectivity in these cases is enhanced because the dendrimers act as a filter, sterically keeping larger molecules out. By immobilizing the dendrimers in a polyelectrolyte multilayer we are able to much more easily retrieve and reuse the catalytic particles. We synthesized a number of metal nanoparticles in PAMAM containing multilayers, and correlated the film assembly conditions to nanoparticle content. PAMAM containing films were shown to contain a much highser density of functional groups when compared to other polyamines, meaning that higher densities of nanoparticles can be synthesized within these films.
 

Nanoparticles and Microparticles: Synthesis and Applications
1:30 PM-5:10 PM, Monday, 11 September 2006 San Francisco Marriott -- Salon C3, Oral

Division of Polymer Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006