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Aggregation Kinetics of Citrate and Polyvinylpyrrolidone Coated Silver Na in Monovalent and Divalent
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2018-08-31 10:11 325阅读次数
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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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Aggregation Kinetics of Citrate and Polyvinylpyrrolidone Coated Silver Na in Monovalent and Divalent
- 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.[详细]
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2018-08-31 10:11
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Aggregation Kinetics of Citrate and Polyvinylpyrroli
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Aggregation Kinetics of Multiwalled Carbon Nanotubes in Aquatic Systems: Measurements and Environmen
- 作者:NAVIDB.SALEH,LISAD.PFEFFERLE,ANDMENACHEMELIMELECH (DepartmentofChemicalEngineering,YaleUniversity,NewHaven,Connecticut06520-8286) 摘要:Theinitialaggregationkineticsofmultiwalledcarbonnanotubes(MWNTs)wereexaminedthroughtime-resolveddynamiclightscattering.AggregationofMWNTswasevaluatedbyvaryingsolutionpHandtheconcentrationofmonovalent(NaCl)anddivalent(CaCl2andMgCl2)salts.SuwanneeRiverhumicacid(SRHA)wasusedtostudytheeffectofbackgroundnaturalorganicmatteronMWNTaggregationkinetics.IncreasingsaltconcentrationandadditionofdivalentcalciumandmagnesiumionsinducedMWNTaggregationbysuppressingelectrostaticrepulsion,similartoobservationswithaquaticcolloidalparticles.Thecriticalcoagulationconcentration(CCC)valuesforMWNTswereestimatedas25mMNaCl,2.6mMCaCl2,and1.5mMMgCl2.AnincreaseinsolutionpHfromacidic(pH3)tobasic(pH11)conditionsresultedinasubstantial(over2ordersofmagnitude)decreaseinMWNTaggregationkinetics,suggestingthepresenceofionizablefunctionalgroupsontheMWNTcarbonscaffold.ThepresenceofhumicacidinsolutionmarkedlyenhancedthecolloidalstabilityofMWNTs,reducingtheaggregationratebynearly2ordersofmagnitude.TheenhancedMWNTstabilityinthepresenceofhumicacidisattributabletostericrepulsionimpartedbyadsorbedhumicacidmacromolecules.OurresultssuggestthatMWNTsarerelativelystableatsolutionpHandelectrolyteconditionstypicalofaquaticenvironments.[详细]
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2018-08-31 10:11
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