COLL 361 |
| Geeta Sharma and Matthias Ballauff. University of Bayreuth, Physikalische Chemie I, Universitaetsstrasse, Bayreuth, 95440, Germany |
| If long polyelectrolyte chains are attached densely to colloidal latex particles, a spherical polyelectrolyte brush results. These spherical polyelectrolytes are dispersed in water and carry a high charge. We demonstrate that these systems can be used to immobilize ions of heavy metal as e.g. gold as counterions. Reduction of these ions leads to metallic nano-particles. In this way the brush layer attached to the surface of the particles becomes a “nano-reactor” that may be used for chemical conversions of the metal ions. We show that the reduction of AuCl4- ions within these nano-reactors leads to well-defined and rather monodisperse gold nano-particles that are attached to the surface of the core. A stable dispersion of polymeric core particles with attached nano-particles results. All results reported here suggest that chemical reactions of ions immobilized in spherical polyelectrolyte brushes provides a new route to composite particles of inorganic and organic materials. |
|
“Smart” Polymers on Surfaces and Colloids
2:00 PM-5:20 PM, Tuesday, March 30, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |