Bridging flocculation of PEI-functionalized latex particles using nanocrystalline cellulose

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1、JournalofColloidandInterfaceScience360(2011)117–123ContentslistsavailableatScienceDirectJournalofColloidandInterfaceSciencewww.elsevier.com/locate/jcisBridgingflocculationofPEI-functionalizedlatexparticlesusingnanocrystallinecelluloseaab,c,⇑LucaManfredi,ReghanJ.Hill,TheoG.M.van

2、deVenaDepartmentofChemicalEngineering,McGillUniversity,Montreal,Quebec,CanadabDepartmentofChemistry,McGillUniversity,Montreal,Quebec,CanadacPulpandPaperResearchCentre,McGillUniversity,Montreal,Quebec,CanadaarticleinfoabstractArticlehistory:Polystyrenemicrosphereswerefunctional

3、izedbycovalentbindingof250kDalinearPEIandethanol-Received25February2011amine,actingasablockingagent,throughbioconjugationwithEDAC.ThefunctionalizedsphereswereAccepted19April2011foundtobecomelesssusceptibletosalt-inducedflocculationduetoelectrostericstability,causedbyAvailableon

4、line28April2011thePEIchainsatlowNaClconcentrations,andathighsaltconcentration,bystericrepulsionbytheeth-anolaminelayer,whichincombinationwithvanderWaalsattractionresultsinashallowenergymini-Keywords:mumandtheformationofafewunstableaggregates.ThelatexaggregatedinthepresenceofFl

5、occulationnanocrystallinecellulose(NCC)withvaryingefficiencies,dependingontheratioofNCCtolatexparticlesNanocolloidsinsolution.Polyelectrolytetitrationshowedthateachlatexspherecontainedabout15graftedPEIchains.BridgingFunctionalizedlatexThefastestaggregationwasdetectedwhenaboutha

6、lfofthesechainswerecoveredbyasingleNCCNanocrystallinecelluloseparticle.BlockingagentÓ2011ElsevierInc.Allrightsreserved.Bioconjugation1.IntroductionThelatex-NCCsystemisamodelforfillerretentioninpaper-making,obviatingtheneedforfibremodification.ThesystemalsoMicroparticleretentionai

7、dsystemshavebecomepopularaddi-modelsothercolloidalsystemsthatinvolvebridging,suchasbloodtivesinpapermaking[1–9].Theypromotethedepositionofpig-plateletaggregationinducedbyfibrinogenorthevonWillebrandments(e.g.,calciumcarbonate)onfibres,andcausefillerfactor[10].Mimickingthebridging

8、ofplateletscanbeaccom-flocculation,whichhelpscaptureinaforming