POLY 304 |
| A nanoparticle building block with well-defined structure and chemical functionality is vital for achieving a precise control on the nanoparticle assemblies. Recently our group developed a synthetic method to prepare monofunctional gold nanoparticles, nanoparticles that contain a single chemical functional group on the surface. This method is based on a "catch-and-release" mechanism. Bifunctional thiol ligands were first immobilized on a polymer support with controlled loading density. Gold nanoparticles were then attached to the polymer-bound thiol ligands. When the density of the thiol ligands immobilized on the polymer support is low enough, a one-to-one place exchange reaction occurred between gold nanoparticles and polymer-bound ligands. After cleaving the product from polymer beads, gold nanoparticles with a single carboxyl group on the surface were obtained. Using these molecular nanobuilding blocks, we synthesized sophisticated nanoparticle/polymer hybrid materials such as “nanonecklace”, “nanochains” and nanoparticle clusters from very simple and traditional chemical reactions. |
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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 |