Aggregation Kinetics of Citrate and Polyvinylpyrrolidone Coated Silver Na in Monovalent and Divalent
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Aggregation Kinetics of Citrate and Polyvinylpyrroli
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作者:NAVIDB.SALEH,LISAD.PFEFFERLE,ANDMENACHEMELIMELECH
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Theaggregationkineticsofsilvernanoparticles(AgNPs)thatwerecoatedwithtwocommonlyuseagentscitrateandpolyvinylpyrrolidone(PVP)wereinvestigated.Time-resolveddynamiclight(DLS)wasemployedtomeasuretheaggregationkineticsoftheAgNPsoverarangeofmonovalenelectrolyteconcentrations.Theaggregationbehaviorofcitrate-coatedAgNPsinNaClwasinexcelwiththepredictionsbasedonDerjaguinLandauVerweyOverbeek(DLVO)theory,andtheHamofcitrate-coatedAgNPsinaqueoussolutionswasderivedtobe3.7×10J.Divalentelectrolytesefficientindestabilizingthecitrate-coatedAgNPs,asindicatedbytheconsiderablylowercriticalcconcentrations(2.1mMCaCland2.7mMMgClvs.47.6mMNaCl).ThePVP-coatedAgNPswsignificantlymorestablethancitrate-coatedAgNPsinbothNaClandCaCl,whichislikelyduetorepulsionimpartedbythelarge,non-chargedpolymers.Theadditionofhumicacidresultedinthethemacromoleculesonbothcitrate-andPVP-coatedAgNPs.TheadsorptionofhumicacidinduceelectrostericrepulsionthatelevatedthestabilityofbothnanoparticlesinsuspensionscontainingNaconcentrationsofCaCl.Conversely,enhancedaggregationoccurredforbothnanoparticlesathighconcentrationsduetointerparticlebridgingbyhumicacidclusters.
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