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• Fluorescent Pigments in Living Coral

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• Accelerating Rate Calorimeter, the esARC

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• Microwave-assisted polymerization of higher alkylene

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• Microwave-assisted polymerization of higher alkylene

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• Recent Advances in Automatic Continuous Online Monitoring of Polymerization Reactions (ACOMP)

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• Online Monitoring of the Final, Divergent Growth Phase in the Step-Growth Polymerization of Polyamin

  Usingautomatic,continuousonlinemonitoringofpolymerizationreactions(ACOMP)thefinal,divergentgrowthphase(FDGP)ofthecondensationpolymerizationofdimethylamine,epichlorohydrin,andethylenediaminewasmonitored,whichproducedahighlyramified,polyelectrolyticpolyamine.Theweightaveragemass,Mw,increasedexponentiallyduringtheFDGP,whereasweightaveragedintrinsicviscosity[è]wincreasedslowly,reachingaplateau.Multi-detectorgelpermeationchromatography(GPC)revealedthatpolymersofmass20000to106arebranchedandself-similar,butabovethismass,[è]increaseslessstronglywithM.Thisappearstobeduetohigherorderramification,aprecursortogelation.TheACOMPtrendsinMwand[è]wprovidedirectonlineevidenceofthisprocess.Itisshowncomputationallythatamereincreaseinpolydispersitycannotexplainthisbehavior.GPCshowedthemassdistributionbecomeshighlyasymmetricasconversionincreases.Aplausiblekineticmodelforthedistributionasymmetryisintroduced,andacomplementarymodelfortheeffectsofhigherorderramificationon[è]w.[詳細]

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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]

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

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• Coup領(lǐng) of near infrared spectroscopy to automatic continuous online monitoring of polymerization r

  Insitunearinfrared(NIR)spectroscopyisperformedsimultaneouslywithautomaticcontinuousonlinemonitoringofpolymerizationreactions(ACOMP)duringmethylmethacrylatepolymerization.ACOMPisanabsolutetechniquethatfurnishesweightaveragemolecularmassMw,intrinsicviscosity,monomerconversion,andothercharacteristics,whereasNIRfurnishesmonomerconversiondataviaanempiricalcalibration.AnadvantageofinsituNIRisthatitfurnishesimmediateinformationontheconversioninthereactor,whereasACOMPreliesoncontinuouswithdrawalanddilutionofasmallstreamofreactorfluid,sothatthereisalagtimeofseveralminutesbetweenwhatACOMPreportsandwhatisoccurringinthereactor.SimultaneousmonomerconversiondatafrominsituNIRandACOMP,thelatterderivedfrombothrefractiveindexandUVabsorption,arecomparedandfoundtobeingoodagreement.TheevolutionofconversionkineticsandMwgenerallyconformtothepredictionsoftheQuasi-SteadyStateApproximation.Havingestablishedtheagreementbetweenthemethods,thepathisnowopenforcombiningNIRwithACOMPtocharacterizeincreasinglycomplexsystems,suchascopolymerizationwithtwoormoremonomericspecies,thatarenotfeasiblebyeithertechniqueseparately.[詳細]

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