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• Interfacial polymerization of thin film nanocomposites: A new concept for reverse osmosis membranes

  作者：AlbertoTiraferria,KaiLoonChenb,RajandreaSethia,MenachemElimelechb　?。╝DITAGDipartimentodiIngegneriadelTerritorio,dell’AmbienteedelleGeotecnologie,PolitecnicodiTorino,CorsoDucadegliAbruzzi,24,10129,Torino,Italy　　bDepartmentofChemicalEngineering,EnvironmentalEngineeringProgram,YaleUniversity,NewHaven,CT06520-8286,USA）　　摘要：Injectionofnanoscalezero-valentiron（NZVI）ispotentiallyapromisingtechnologyforremediationofcontaminatedgroundwaters.However,theefficiencyofthisprocessissignificantlyhinderedbytherapidaggregationoftheironnanoparticles.Theaimofthisstudywastoenhancethecolloidalstabilityofthenanoparticlesthroughtheadditionofthe“green”polymerguargum.Weevaluatedthepropertiesofguargumanditsinfluenceonthesurfaceproperties,particlesize,aggregation,andsedimentationofironnanoparticles.Commercialironnanoparticlesweredispersedinguargumsolutions,andtheiraggregationandsedimentationbehaviorswerecomparedtothoseofbareironnanoparticlesandcommercialnanoparticlesmodifiedwithabiodegradablepolymer（polyaspartate）.Highperformancesizeexclusionchromatography,chargetitration,andviscosityassessmentshowedthatguargumisahighmolecularweightpolymerwhichisnearlyneutrallycharged,renderingitsuitableforstericstabilizationoftheironnanoparticles.Electrophoreticmobilitymeasurementsdemonstratedtheabilityofguargumtoadsorbonthenanoparticles,formingaslightlynegativelychargedlayer.Dynamiclightscatteringexperimentswereconductedtoestimatetheparticlesizeofthedifferentnanoparticlesuspensionsandtodeterminetheaggregationbehavioratdifferentionicstrengths.Guargumeffectivelyreducedthehydrodynamicradiusofthebarenanoparticlesfrom500nmtolessthan200nmandpreventedaggregationofthenanoparticlesevenatveryhighsaltconcentrations（0.5MNaCland3mMCaCl2）.Sedimentationprofilesofthedifferentnanoparticlesuspensionsconfirmedtheimprovedstabilityoftheironnanoparticlesinthepresenceofguargum.Theresultsstronglysuggestthatguargumcanbeusedtoeffectivelydeliverstabilizedzero-valentironnanoparticlesforremediationofcontaminatedgroundwateraquifers.　　關(guān)鍵詞：Zero-valentironnanoparticles;Guargum;Greenpolymers;Aggregation;Stericstabilization;Groundwaterremediation;DLS;Particlesize[詳細]

  2018-08-31 10:11

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• Interfacial polymerization of thin film nanocomposites：A new concept for reverse osmosis membranes

  Interfacial polymerization of thin film nanocomposites：A new concept for reverse osmosis membranes[詳細]

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• Interactions control領(lǐng) biopolymer fou領(lǐng) of reverse osmosis membranes

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• EQCM Investigations of a Thin Polymer Film

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• EQCM Investigations of a Thin Polymer Film

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• Thin Film Stress Measurement Using Dektak Stylus Pro

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• Nanocomposites Examples on Compounding

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• Accelerating the Living Polymerization of

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• Lipid exchange between membranes

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• Microwave-assisted polymerization of higher alkylene

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• Microwave-assisted polymerization of higher alkylene

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• Water-swollen cation-exchange membranes prepared usi

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• Interfacial silica nanoparticles stabilize cocontinu

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• Evaluation of the interfacial bonding between fibrou

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• PetroThin? Thin Sectioning System

  The PetroThin Thin Sectioning System is a precise, easy-to-use instrument for re-sectioning and thinning a wide variety of samples,such as rocks and minerals, ceramics, concrete, bone, and teeth for performing materials characterization.[詳細]

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• Nanoindentation of a 10-nm-thick thin film.pdf

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• NEW Fermentation Technology

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• New Sonifier Manual

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