Bimetallic metal nanoparticles immobilized on spherical polyelectrolyte brushes

PMSE 65

Marc Schrinner, marc.schrinner@uni-bayreuth.de1, Joachim Schmelz, joachim.schmelz@uni-bayreuth.de2, Sebastian Proch3, Rhett Kempe, kempe@uni-bayreuth.de3, Nobuyoshi Miyajima4, and Matthias Ballauff, matthias.ballauff@uni-bayreuth.de1. (1) Physical Chemistry I, University of Bayreuth, Universitaetsstrasse 10, 95440 Bayreuth, Germany, (2) Macromolecular Chemistry II, University of Bayreuth, Universitaetsstrasse, 95440 Bayreuth, Germany, (3) Inorganic Chemistry II, University of Bayreuth, 95440 Bayreuth, Germany, (4) Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany
We demonstrate that spherical polyelectrolyte brushes can be used to generate and to utilize alloy nanoparticles. The spherical polyelectrolyte brushes consist of a solid polystyrene core onto which long chains of a cationic polyelectrolyte are densely grafted. Immersed in water, the polyelectrolyte layer will swell and metal ions can be confined within this layer. Reduction of the confined metal ions leads to metal nanoparticles or to alloys thereof. We demonstrate in our contribution that the nano-alloys thus prepared exhibit properties widely differing from the properties of the respective bulk alloys. The alloy nanoparticles are shown to be homogeneous solid solutions. Moreover, they are effective catalysts as e.g. for the selective oxidation of alcohols to aldehydes and ketones.
 

Synthesis and Self-Assembly Approaches to Polymer-Inorganic Hybrid Nanoparticles
8:30 AM-12:00 PM, Monday, April 7, 2008 Hilton New Orleans Riverside -- Grand Salon 24, Oral

Division of Polymeric Materials: Science & Engineering

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008