Abstract
The stability of Pd dendrimer-encapsulated nanoparticles (DENs) in air-, N2-, and H2-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 airsaturated solution, less oxidation in the N2-saturated solution, and no detectable oxidation when the DENs are in contact with H2. 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.
| Original language | English |
|---|---|
| Pages (from-to) | 10279-10284 |
| Number of pages | 6 |
| Journal | Langmuir |
| Volume | 25 |
| Issue number | 17 |
| DOIs | |
| State | Published - Sep 1 2009 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electrochemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Materials Science(all)
- Spectroscopy
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Quantitative analysis of the stability of Pd dendrimer-encapsulated nanoparticles. / Carino, Emily V.; Knecht, Marc; Crooks, Richard M.
In: Langmuir, Vol. 25, No. 17, 01.09.2009, p. 10279-10284.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Quantitative analysis of the stability of Pd dendrimer-encapsulated nanoparticles
AU - Carino, Emily V.
AU - Knecht, Marc
AU - Crooks, Richard M.
PY - 2009/9/1
Y1 - 2009/9/1
N2 - The stability of Pd dendrimer-encapsulated nanoparticles (DENs) in air-, N2-, and H2-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 airsaturated solution, less oxidation in the N2-saturated solution, and no detectable oxidation when the DENs are in contact with H2. 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.
AB - The stability of Pd dendrimer-encapsulated nanoparticles (DENs) in air-, N2-, and H2-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 airsaturated solution, less oxidation in the N2-saturated solution, and no detectable oxidation when the DENs are in contact with H2. 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.
UR - http://www.scopus.com/inward/record.url?scp=69949179174&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=69949179174&partnerID=8YFLogxK
U2 - 10.1021/la9011108
DO - 10.1021/la9011108
M3 - Article
C2 - 19438213
AN - SCOPUS:69949179174
VL - 25
SP - 10279
EP - 10284
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 17
ER -