COLL 515 |
| Ryan M Richards and Lawrence D'Souza. School of Engineering and Science, International University Bremen, Campus Ring 8, 28759 Bremen, Germany |
| Metal colloids of Pd, Au, Ag and Ru have been stabilized by heteropolyanions (PW11O39)-7, (P2W18O62)-6, (Mo6O19)-2 and (PMo12O40)-3. The nano-systems were characterized using various instrumentation such as UV-Visible spectroscopy, dynamic light scattering, FT-IR spectroscopy, X-ray diffraction and transmission electron microscopy. The pH of the solution was found to play an important role in colloid stabilization/coagulation. The particle size distribution was found to be strongly dependent on the metal/stabilizer ratio and preparation protocol. The Pd colloid was found to be re-dispersible in water, methanol and acetonitrile while Ag was soluble only in water and methanol. The Pd system demonstrated high activity for the hydrogenation of 1-hexene and further examination of catalytic activity is on-going. |
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Symposium in Memory of Arthur W. Adamson
2:00 PM-5:20 PM, Thursday, April 1, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |