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Article: Oxidative dissolution of silver nanoparticles by dioxygen: A kinetic and mechanistic study
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TitleOxidative dissolution of silver nanoparticles by dioxygen: A kinetic and mechanistic study
 
AuthorsHo, CM1
Wong, CK1
Yau, SKW1
Lok, CN1
Che, CM1
 
Keywordskinetics
nanoparticles
oxidation
oxygen
silver
 
Issue Date2011
 
PublisherWiley - V C H Verlag GmbH & Co. KGaA. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2451
 
CitationChemistry - An Asian Journal, 2011, v. 6 n. 9, p. 2506-2511 [How to Cite?]
DOI: http://dx.doi.org/10.1002/asia.201100034
 
AbstractWe have recently reported a kinetic and mechanistic study on oxidative dissolution of silver nanoparticles (AgNPs) by H 2O 2. In the present study, the parameters that govern the dissolution of AgNPs by O 2 were revealed by using UV/Vis spectrophotometry. Under the same reaction conditions (Tris-HOAc, pH 8.5, I=0.1 M at 25 °C) the apparent dissolution rate (k app) of AgNPs (10±2.8 nm) by O 2 is about 100-fold slower than that of H 2O 2. The reaction rate is first-order with respect to [Ag 0], [O 2], and [Tris] T, and inverse first-order with respect to [Ag +] (where [Ag 0]=total concentration of Ag metal and [Tris] T=total concentration of Tris). The rate constant is dependent on the size of AgNPs. No free superoxide (O 2 -) and hydroxyl radical (·OH) were detected by trapping experiments. On the basis of kinetic and trapping experiments, an amine-activated pathway for the oxidation of AgNPs by O 2 is proposed. Copyright © 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
 
ISSN1861-4728
2013 Impact Factor: 3.935
2013 SCImago Journal Rankings: 1.861
 
DOIhttp://dx.doi.org/10.1002/asia.201100034
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorHo, CM
 
dc.contributor.authorWong, CK
 
dc.contributor.authorYau, SKW
 
dc.contributor.authorLok, CN
 
dc.contributor.authorChe, CM
 
dc.date.accessioned2012-08-16T05:48:56Z
 
dc.date.available2012-08-16T05:48:56Z
 
dc.date.issued2011
 
dc.description.abstractWe have recently reported a kinetic and mechanistic study on oxidative dissolution of silver nanoparticles (AgNPs) by H 2O 2. In the present study, the parameters that govern the dissolution of AgNPs by O 2 were revealed by using UV/Vis spectrophotometry. Under the same reaction conditions (Tris-HOAc, pH 8.5, I=0.1 M at 25 °C) the apparent dissolution rate (k app) of AgNPs (10±2.8 nm) by O 2 is about 100-fold slower than that of H 2O 2. The reaction rate is first-order with respect to [Ag 0], [O 2], and [Tris] T, and inverse first-order with respect to [Ag +] (where [Ag 0]=total concentration of Ag metal and [Tris] T=total concentration of Tris). The rate constant is dependent on the size of AgNPs. No free superoxide (O 2 -) and hydroxyl radical (·OH) were detected by trapping experiments. On the basis of kinetic and trapping experiments, an amine-activated pathway for the oxidation of AgNPs by O 2 is proposed. Copyright © 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
 
dc.description.naturelink_to_subscribed_fulltext
 
dc.identifier.citationChemistry - An Asian Journal, 2011, v. 6 n. 9, p. 2506-2511 [How to Cite?]
DOI: http://dx.doi.org/10.1002/asia.201100034
 
dc.identifier.doihttp://dx.doi.org/10.1002/asia.201100034
 
dc.identifier.epage2511
 
dc.identifier.hkuros205080
 
dc.identifier.issn1861-4728
2013 Impact Factor: 3.935
2013 SCImago Journal Rankings: 1.861
 
dc.identifier.issue9
 
dc.identifier.pmid21608134
 
dc.identifier.scopuseid_2-s2.0-80051767678
 
dc.identifier.spage2506
 
dc.identifier.urihttp://hdl.handle.net/10722/159378
 
dc.identifier.volume6
 
dc.languageeng
 
dc.publisherWiley - V C H Verlag GmbH & Co. KGaA. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2451
 
dc.publisher.placeGermany
 
dc.relation.ispartofChemistry - An Asian Journal
 
dc.relation.referencesReferences in Scopus
 
dc.subjectkinetics
 
dc.subjectnanoparticles
 
dc.subjectoxidation
 
dc.subjectoxygen
 
dc.subjectsilver
 
dc.titleOxidative dissolution of silver nanoparticles by dioxygen: A kinetic and mechanistic study
 
dc.typeArticle
 
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Author Affiliations
  1. Institute of Molecular Technology for Drug Discovery and Synthesis, Hong Kong