COLL 461 |
| Dipolar nanoparticles have generated considerable theoretical and experimental interest with respect to the synthesis, assembly and physical properties of these materials. Metallic ferromagnetic colloids are an intriguing class of dipolar nanoparticles that are capable of one-dimensional self-assembly, or directed magnetic association in the presence of external magnetic fields. The use of magnetic dipoles to self-organize materials is attractive as the directionality of magnetic fields can be used to control nanoparticle assembly in a variety of different media and is a relatively inexpensive process. We have focused on developing versatile synthetic methods to prepare and functionalize polymer coated ferromagnetic cobalt nanoparticles in appreciable quantities. Controlled polymerization and post-modification of functional polymers have enabled the synthesis of a wide range of surfactants that can be used to synthesize, stabilize and introduce functionality to ferromagnetic nanoparticle surfaces. Access to a library of functional dipolar colloids has enabled the synthesis of one-dimensional mesostructured materials by systematic variation of copolymer shell composition and structure. The advantages of polymer passivation of ferromagnetic nanoparticles will be discussed, namely, the ability to tune colloidal dispersion in various media, such as, organic solvents, water and polymer thin films. |
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Polymer-Nanoparticle Systems: Theory, Simulation, Experiments
9:00 AM-11:40 AM, Thursday, April 10, 2008 Morial Convention Center -- Rm. 227, Oral
Division of Colloid & Surface Chemistry |