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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1021/la300929g
|2 doi
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|a pubmed24n0726.xml
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|a (DE-627)NLM217996450
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|a (NLM)22616806
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a He, Di
|e verfasserin
|4 aut
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| 245 |
1 |
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|a H2O2-mediated oxidation of zero-valent silver and resultant interactions among silver nanoparticles, silver ions, and reactive oxygen species
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|c 2012
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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| 500 |
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|a Date Completed 01.11.2012
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a The H(2)O(2)-mediated oxidation of silver nanoparticles (AgNPs) over a range of pH (3.0-14.0) is investigated here, and an electron charging-discharging model capable of describing the experimental results obtained is developed. AgNPs initially react with H(2)O(2) to form Ag(+) and superoxide, with these products subsequently reacting to reform AgNPs (in-situ-formed AgNPs) via an electron charging-discharging mechanism. Our experimental results show that the AgNP reactivity toward H(2)O(2) varies significantly with pH, with the variation at high pH (>10) due particularly to the differences in the reactivity of H(2)O(2) and its conjugate base HO(2)(-) with AgNPs whereas at lower pH (3-10) the pH dependence of H(2)O(2) decay is accounted for, at least in part, by the pH dependence of the rate of superoxide disproportionation. Our results further demonstrate that the in-situ-formed AgNPs resulting from the superoxide-mediated reduction of Ag(+) have a different size and reactivity compared to those of the citrate-stabilized particles initially present. The turnover frequency for AgNPs varies significantly with pH and is as high as 1776.0 min(-1) at pH 11.0, reducing to 144.2 min(-1) at pH 10.0 and 3.2 min(-1) at pH 3.0
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Cations, Monovalent
|2 NLM
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|a Citrates
|2 NLM
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|a Reactive Oxygen Species
|2 NLM
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|a trisodium citrate
|2 NLM
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|a Silver
|2 NLM
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|a 3M4G523W1G
|2 NLM
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|a Hydrogen Peroxide
|2 NLM
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|a BBX060AN9V
|2 NLM
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| 650 |
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|a Superoxide Dismutase
|2 NLM
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| 650 |
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|a EC 1.15.1.1
|2 NLM
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| 700 |
1 |
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|a Garg, Shikha
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Waite, T David
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 28(2012), 27 vom: 10. Juli, Seite 10266-75
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:28
|g year:2012
|g number:27
|g day:10
|g month:07
|g pages:10266-75
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|u http://dx.doi.org/10.1021/la300929g
|3 Volltext
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