简介:Thehybridstructuresofpolystyrene-b-poly(ethyleneoxide)(PS-b-PEO)blockcopolymerandinorganicnanoparticleswithgoodstabilityandbiocompatibilityhavepotentialapplicationsindrugdeliveryandbioimaging.Sphericalco-assembliesofPS120-b-PEO318andoleylamine-cappedCdSquantumdots(QDs)areproducedsuccessfullyinthisworkbyaddingwatertoamixedcommonsolvent,suchasN,N-dimethylmethanamide(DMF)/chloroform,DMF/tetrahydrofuran(THF),orDMF/toluene.TheenergydispersiveX-ray(EDX)spectrumindicatesthatQDsarelocatedattheinterfacebetweenthecoreandshellofthesphericalco-assemblies.Theco-assemblyprocessduringwateradditionistracedbytransmissionelectronmicroscopy(TEM)andturbiditymeasurement.Sphericalco-assembliesareformedthroughbuddingfrombilayersoftheblockcopolymerandQDs.Themorphologyoftheco-assembliesisrelatedtothemiscibilityoftheQD-dispersingsolventswithwaterandthemorphologychangesfromasphericaltoavesicle-likestructurewithDMF/toluene.IncreasingTHFcontentinthemixedsolventcausesmorphologicaltransitionsfromsphericalco-assembliestomulti-branchedcylindersandmicelleswhereQDsarelocatedinthecentralcore.Increasingchloroformcontentyieldsvesicle-likestructureswithprotrudingrodsonthesurface.Themechanismofthemorphologicaltransitionsisalsodiscussedindetail.
简介:TheelectrooxidationofBilirubin(BR)inN,N’-dimethylformamide(DMF)andDMF+H2Omixedsolventisinvestigatedbyvoltammetrytechniques,insiturapidscanthinlayerspectroelectrochemistryandinsituESRspectroscopy.ThedatarevealthattheoxidationprocessofBRundergoesmanystages,whichareallspedupbytheintroductionofwater.ThespeciesofbilirubintakingpartinthereactionisfoundtobechangedfromBRinDMFintoBR’inthemixedsolventsandtheanodicpeakpotentialisshiftedcorrespondinglyfrom+0.58Vto+0.026-+0.35V(vs.Ag/AgCl,1.0MKCl).Freeradicalsandthedimerizationofthemareobservedduringtheoxidation.
简介:Inamixedsolventofaceticacid(AcOH)/water,methylenediphenyldicarbamate(MDC)wassynthesizedbythecondensationofmethylphenylcarbamate(MPC)andformaldehydeinthepresenceofaninorganicacidcatalyst.BasedonthedifferentsolubilitiestoMPCandMDC,themixedsolventshowedhighercatalyticperformancethanpurewater.ThemixedsolventnotonlypromotedthecondensationofMPCbutasloexhibitedtheadvantageoftheproductseparationwiththereactants.Undertheoptimizedconditions:aH_2SO_4massfractionof31%,areactiontemperatureof95℃andreactiontimeof3.5h,theyieldofMDCreached74.3%.Inaddition,therecycleofthesolventwasalsoinvestigated.
简介:Amongthepresentthreetypesofelectricfield-inducedluminescencewenoticedsimilaritiesbetweentheinorganicandorganicmaterialsinelectricfieldintensity.InthishighelectricfieldrangeSiO2hasthreefunctions:acceleration,excitationandmultiplicationofelectrons.Basedontheaccelerationeffect,cathodoluminescence-likeemissionoforganicmoleculesandpolymerswasfound.ByusingthethreefunctionsofSiO2orII-VIcompoundsandtheheterojunctionofinorganicandorganicmaterialwerealizeddifferentvariantsofmixedexcitationinelectroluminescence.
简介:Yamen(GV15)Location:0.5cundirectlyabovethemidpointoftheposteriorhairline.
简介:Summary:Thisarticlediscussesthedramatizedtragedy“DeathofaSalesman”andshowsthattragedycouldbeaboutthecommonmanKeyWords:drama、tragedy、salesman、common@1
简介:Tuinatechniquesinchildrenaresimilartothoseinadults.Somearesameinname,butdifferentinmethods,suchaspushingtechnique.Sometechniquesarejustappliedtochildrenratherthantoadults,suchaspushingmethod.Inclinicalpractice,suchintenseTuinatechniquesasnailing,grasping,andpinchingarepracticedastheendingmanipulations,soasnottohurtchildrenandaffecttreatment.Suchmediaasgingerjuice,Talcumpowderandeggwhitearecommonlyusedtopreventfromskinabrasionandimprovetherapeuticeffects.
简介:CommonAspirationsofWorldWomenHuangBaoshanOver30,000participants,fromdifferentracestheworldover,gatheredinBeijingtodiscusswome...
简介:在顺序的拍卖,衰退价格的现象经常被观察,在理论,罐头它被supermartingale代表。这份报纸采用投标人价值可以在阶段上改变,普通priors被留下的投标人顺序调整的观点。衰退价格顺序能被在拍卖之间的普通priors的调整解释,这被显示出。普通priors的调整被随机的订单描绘。为一个supermartingale价格序列的足够、必要的条件被导出。