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 substant...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1992. - 25(2009), 17 vom: 01. Sept., Seite 10279-84 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2009
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article |
| Zusammenfassung: | 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 |
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| Beschreibung: | Date Completed 03.11.2009 Date Revised 26.08.2009 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la9011108 |