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1、Adsptionofsurfactantbynanosilicaparticlesincarbonnanotubeswaterdispersions:applicationinacementmatrixOscarA.MendozaReales1WilliamC.PearlJr.2MariaD.M.Paiva2CristianeR.Mira3RomildoDiasToledoFilho11.CivilEngineeringDepartme
2、ntPECCOPPEUniversidadeFederaldoRiodeJaneiroRiodeJaneiro21941972Brazil2.HalliburtonBrazilTechnologyCenterHalliburtonRiodeJaneiro21941907Brazil3.PetrobrasPetrleoBrasileiroS.ARiodeJaneiro21941901BrazilAbstractThiswkstudiesh
3、ownanosilicaparticlesinteractwithacommercialdispersionofnonfunctionalizedcarbonnanotubesrichinsurfactanthowthiscombinationaffectsthepozzolanicactivityofthenanosilicainacementpaste.Thematerialsusedweremultiwalledcarbonnan
4、otubes(MWCNT)dispersedinwaterwithananionicsurfactantasdispersingagentcolloidalsilicananoparticles(NS)dispersedinwaterClassGcement.Cementpasteswithawatertocementratioof0.45additionsofMWCNTNSupto0.50%bymassofcementwereprod
5、ucedintwostepsthedispersionsofnanoparticleswerecombinedwiththemixingwaterusinganultrasonictipprocessthenthecementwasaddedhmixeduntilahomogeneouspastewasobtained.Isothermalcalimetryresultsshowedthatwhenthepasteswereblende
6、donlywithMWCNTthesurfactantpresentinthedispersionactedasaretardingagentdelayingtheheatreleaseofthehydrationreactionwhilstwhenthepasteswereblendedwithNSMWCNTthisretardationeffectwasminimized.Transmissionelectronmicroscopy
7、(TEM)thermogravimetricanalyses(TGA)resultsshowedthatinthefirststepofthemixingtheNSparticlesadsbedtheexcessofsurfactantpresentintheMWCNTdispersionpartiallymaintainingitspozzolanicactivity.iginalityTheretardedhydrationofce
8、mentMWCNTcompositesisstudiedinthiswkanovelapproachtominimizethisretardationusingNSparticlesisproposed.Surfactantsareaneffectivedispersingagentfnonfunctionalizedcarbonnanotubesinwaterbutatthesametimehavethepotentialtowide
9、lyretardthehydrationofcementwhenspecifictypesamountsareused.IftheMWCNTdispersionrichinsurfactantismixedwithcementtheexcessofsurfactantwilladsbontothesurfaceoftheanhydrousgrainskeepingthewatermoleculesawayretardingthehydr
10、ation.Themethodologyproposedconsistsoftheintroductionofanadditionalsurfaceontowhichtheexcessofsurfactantcanadsbpreventingitfromadsbingontothesurfaceofthecementgrains.NSparticleswerechosenfthispurposebecausetheyhaveadualf
11、unctionalityhighsurfaceareafsurfactantadsptionpozzolanicactivity.Keywds:Carbonnanotubesnanosilicasurfactantretardationpozzolaniceffect1Crespondingauth:Tel552139388215Fax552139388221AccdingtotheEDXresultspresentedintable1
12、theXRDpatternpresentedinfigure1NSparticlesarecomposedmainlyofamphoussilica.DLSresultspresentedinfigure2showthattheNShasanaverageparticlesizeof29.0nm(d50)anarrowsizedistribution.NSalsopresentedalossonignition(LOI)of9.0%aT
13、GAwasperfmedtoidentifythesourceofthismasslosstheresultsarepresentedinfigure3.Thetotalmasslossfoundinthethermogravimetric(TG)curveiscompatiblewiththatfoundintheLOItest.Mostofitoccurredunder100Cwithabroadpeakinthederivativ
14、ethermogravimetric(DTG)curveat42Cgoingalmostupto200C.ThisdecompositioneventcanbeassociatedwiththeevapationofadsbedwaterontothesurfaceofthenanoparticlescombinedwithadehydrationofOHgroupspresentinthestructureonthesurfaceof
15、thesilicaasfunctionalgroups.Accdingtothemanufacturerthesefunctionalgroupsweregeneratedonthesurfaceofthenanoparticlestoenhancethestabilityoftheaqueousdispersionovertime.Tab.1ChemicalcompositionsbyEDXspectroscopyofNS%Compo
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