学科分类
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411 个结果
  • 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.

  • 标签: Co-assembly Mixed common solvent PS-B-PEO Solvent composition
  • 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.

  • 标签: ELECTROOXIDATION BILIRUBIN biliverdin.
  • 简介:Inamixedsolventofaceticacid(AcOH)/water,methylenediphenyldicarbamate(MDC)wassynthesizedbythecondensationofmethylphenylcarbamate(MPC)andformaldehydeinthepresenceofaninorganicacidcatalyst.BasedonthedifferentsolubilitiestoMPCandMDC,themixedsolventshowedhighercatalyticperformancethanpurewater.ThemixedsolventnotonlypromotedthecondensationofMPCbutasloexhibitedtheadvantageoftheproductseparationwiththereactants.Undertheoptimizedconditions:aH_2SO_4massfractionof31%,areactiontemperatureof95℃andreactiontimeof3.5h,theyieldofMDCreached74.3%.Inaddition,therecycleofthesolventwasalsoinvestigated.

  • 标签: 氨基甲酸甲酯 混合溶剂 二苯基甲烷 催化合成 氨基甲酸酯 MDC
  • 简介:用来清理和分离粘接不合适的材料.包括金属、石头、玻璃、木头等类似的材料,将其上已凝固的环氧和聚酯树脂清洗干净.并且不会对其表面产生任何破坏作用。

  • 标签: SOLVENT ATTACK SOLUTION 粘接材料 清理剂 除胶剂
  • 简介:common为形容词,意为“普通的,常见的;共有的,共用的”。【经典例句】SmithisacommonnameinEngland.在英国Smith是个很普通的名字。

  • 标签: SMITH 经典例句 形容词
  • 简介:Amongthepresentthreetypesofelectricfield-inducedluminescencewenoticedsimilaritiesbetweentheinorganicandorganicmaterialsinelectricfieldintensity.InthishighelectricfieldrangeSiO2hasthreefunctions:acceleration,excitationandmultiplicationofelectrons.Basedontheaccelerationeffect,cathodoluminescence-likeemissionoforganicmoleculesandpolymerswasfound.ByusingthethreefunctionsofSiO2orII-VIcompoundsandtheheterojunctionofinorganicandorganicmaterialwerealizeddifferentvariantsofmixedexcitationinelectroluminescence.

  • 标签: Cathodoluminescence-like emission MIXED excitation INORGANIC-ORGANIC HETEROGENEOUS
  • 简介:Basedontheadvantagesofthemixedclarifierandtowerextractor,amulti-layerclarificationextractor---anewtypeofmixedclarifier,hasbeendeve-loped,andhasalreadybeenappliedtotheseparationofREelementsandgerma-

  • 标签: TOWER URANIUM PATENT
  • 简介:Yamen(GV15)Location:0.5cundirectlyabovethemidpointoftheposteriorhairline.

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  • 简介:Whilethehumanracehasaccomplishedmanyamazingfeats,curingthecommoncoldhasnotbeenoneofthem.Evenafterhundredsofyearsofresearch,scientistsstillcannotstompoutthetinybug.

  • 标签: BUG RESEARCH YEARS WHILE hundreds
  • 简介:Summary:Thisarticlediscussesthedramatizedtragedy“DeathofaSalesman”andshowsthattragedycouldbeaboutthecommonmanKeyWords:drama、tragedy、salesman、common@1

  • 标签: 山地
  • 简介:Tuinatechniquesinchildrenaresimilartothoseinadults.Somearesameinname,butdifferentinmethods,suchaspushingtechnique.Sometechniquesarejustappliedtochildrenratherthantoadults,suchaspushingmethod.Inclinicalpractice,suchintenseTuinatechniquesasnailing,grasping,andpinchingarepracticedastheendingmanipulations,soasnottohurtchildrenandaffecttreatment.Suchmediaasgingerjuice,Talcumpowderandeggwhitearecommonlyusedtopreventfromskinabrasionandimprovetherapeuticeffects.

  • 标签: 推拿手法 儿童 皮肤磨损 临床实践
  • 简介:CommonAspirationsofWorldWomenHuangBaoshanOver30,000participants,fromdifferentracestheworldover,gatheredinBeijingtodiscusswome...

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  • 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。

  • 标签: 第一价格的封口出价拍卖 私人值的范例 顺序的拍卖