Colloidal Metal Deposition onto Functionalized Polystyrene Microspheres
| Autor: | Mark E. Thompson, and G. K. Surya Prakash, J. Thomas James, Srikant Pathak, Alexandre G. Dokoutchaev, Shannon C. Koene |
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| Rok vydání: | 1999 |
| Předmět: |
Chemistry
General Chemical Engineering Catalyst support digestive oral and skin physiology Ionic bonding Viologen General Chemistry Adhesion Polyelectrolyte Metal Colloid Adsorption Chemical engineering visual_art Polymer chemistry Materials Chemistry medicine visual_art.visual_art_medium medicine.drug |
| Zdroj: | Chemistry of Materials. 11:2389-2399 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm9900352 |
| Popis: | Three different methods are described for uniformly anchoring metal colloids (Pt, Pd, and Au) onto the surface of polystyrene microspheres (PSMS). The first method we have employed is electrostatic deposition of preformed anionic colloidal particles onto a polycationic surface. In this method the functional groups on the surfaces of the microspheres (amine or carboxylic acid) are used to give the surface a net charge. These ionic spheres were then treated with polyelectrolytes of the opposite charge, which uniformly cover the surface. When the spheres have a net positive charge at the surface they show excellent adhesion of Au colloids. These metal-derivatized spheres can be prepared with electroactive viologen groups as well. In the second method investigated here, metal colloids are adsorbed to the surface of neutral functionalized PSMS. We report the synthesis and characterization of catalytically important noble monometallic colloids using various chemical and sonochemical methods. These metal colloid... |
| Databáze: | OpenAIRE |
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