PMSE 140 |
| A number of different synthetic approaches have been described to prepare hairy colloids composed of ferromagnetic nanoparticles possessing a polymer corona. Dipolar nanoparticles composed of metallic iron, cobalt, or nickel have most notably been synthesized using various functional polymers for applications in magnetic storage, separations and catalysis. We have recently developed a synthetic method to prepare dipolar nanoparticles that are coated with well-defined polystyrene surfactants. In these systems, end-functional polymeric surfactants were utilized to sterically stabilize metallic colloids and further carry functionality onto the hybrid nanoparticle corona. Controlled radical polymerizations based on nitroxide mediated polymerization (NMP) and atom transfer radical polymerization (ATRP) were employed to prepare the end-functional polystyrene surfactants, which were able to be made on multi-gram scale. Furthermore, the synthesis of nearly gram-scale batches of these polymer coated ferromagnetic metallic cobalt colloids (diameter = 20 nm) was achieved by optimizing conditions in the thermolysis of metal carbonyl precursors. We will discuss our work on the synthesis and functionalization of these dipolar nanoparticles with (co)polymers, as well as, methodologies to organize these into 1-D mesoscopic assemblies. |
|
Synthesis and Self-Assembly Approaches to Polymer-Inorganic Hybrid Nanoparticles
8:30 AM-11:50 AM, Tuesday, April 8, 2008 Hilton New Orleans Riverside -- Grand Salon 24, Oral
Division of Polymeric Materials: Science & Engineering |