Quantitative analysis of the stability of pd dendrimer-encapsulated nanoparticles.
The stability of Pd dendrimer-encapsulated nanoparticles (DENs) in air-, N(2)-, and H(2)-saturated aqueous solutions is reported. The DENs consisted of an average of 147 atoms per sixth-generation, poly(amidoamine) dendrimer. Elemental analysis and UV-vis spectroscopy indicate that there is substantial oxidation of the Pd DENs in the air-saturated solution, less oxidation in the N(2)-saturated solution, and no detectable oxidation when the DENs are in contact with H(2). Additionally, the stability improves when the DEN solutions are purified by dialysis to remove Pd(2+)-complexing ligands such as chloride. For the air- and N(2)-saturated solutions, most of the oxidized Pd recomplexes to the interiors of the dendrimers, and a lesser percentage escapes into the surrounding solution. The propensity of Pd DENs to oxidize so easily is a likely consequence of their small size and high surface energy.
Carino
Emily V
EV
Department of Chemistry and Biochemistry, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165, USA.
Knecht
Marc R
MR
Crooks
Richard M
RM