简介：Aminopropyl,ethylenediamine,ethenylandglycidoxygroupsfunctionalizednanoparticles,withaveragediametersrangingfrom4to6nmandcontaining1.17mmolofgroups/g,arereadilyobtainedfromnanodiamondsmodifiedwithsilanecouplingagent.Forthestudyofthesenanoparticles,TEM,IRS,XPS,andTGanalysismethodshavebeenused.

简介：Thetimeevolutionofoxygenplasmatreatedpolystyrene(PS)surfaceswasinvestigateduponstoringthemintheairundercontrolledhumidityconditions.Themethodsofwatercontactangle,X-rayphotoelectronspectroscopy(XPS),sumfrequencygeneration(SFG)vibrationalspectroscopy,andatomicforcemicroscopy(AFM)wereusedtoinferthesurfacepropertiesandstructure.ChemicalgroupscontainingoxygenwereformedonthePSsurfacewiththeplasmatreatment,demonstratedbywatercontactangleandXPS.Thesurfacepolaritydecayedmarkedlyontime,asassessedbysteadyincreaseinthewatercontactangleasafunctionofstoragetime,fromzerotoaround60°.Theobserveddecayisinterpretedasarisingfromsurfacerearrangementprocessestoburyingpolargroupsawayfromtheuppermostlayerofthesurfaces,whichisincontactwithair.Ontheotherhand,XPSresultsshowthatthechemicalcompositioninthefirst3nmsurfacelayerisunaffectedbythesurfaceaging,andthedepthprofileofoxygenisessentiallythesamewithtime.ApossiblechangeofPSsurfaceroughnesswasexaminedbyAFM,anditshowedthattheincreaseofwatercontactangleduringsurfaceagingcouldnotbeattributedtosurfaceroughness.Thus,itisconcludedthatsurfaceagingisattributabletosurfacereorganizationandthemotionofoxygencontaininggroupsisconfinedwithintheXPSprobingdepth.SFGspectroscopy,whichisintrinsicallyinterface-specific,wasusedtodetectthechemicalstructureofPSsurfaceatthemolecularlevelaftervariousagingtimes.Theresultsareinterpretedasfollows.DuringtheagingoftheplasmatreatedPSsurfaces,theoxygencontaininggroupsundergoreorientationprocessestowardthepolymerbulkand/orparalleltothesurface,whiletheCH2moietystandsuponthePSsurface.Ourresultsindicatethatthesurfaceconfigurationchangesdonotrequirelargelengthscalesegmentalmotionsormigrationofmacromolecules.Motionsthatareresponsibleforsurfaceconfigurationchangescoul

简介：Thisreviewfocusedontherecentreportsrelatedtothefunction,characterizationandmodificationofoxygen-containingsurfacegroupsofactivatedcarbon(AC).TheOxygen-containingsurfacegroupswerebrieflydescribed,andthemostfrequentlyusedtechniquesforcharacterizationoftheoxygen-containingsurfacegroupsonACswerealsobrieflystated.Adetaileddiscussionoftheeffectsoftheoxygen-containingsurfacegroupsontheadsorptivecapacityofACwasgiven.Therecentprogressesinmodificationoftheoxygen-containingsurfacegroupsofACwerealsoreviewed.

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简介：Thisstudyinvestigatedtheinfluenceofvariousorganicallymodifiedmontmorillonites(organoclays)onthestructureandpropertiesofrigidpolyurethanefoam(RPUF)nanocomposites.Theorganoclaysweremodifiedwithcetyltrimethylammoniumbromide(CTAB),methyltallowbis(2-hydroxyethyl)quaternaryammoniumchloride(MT2ETOH)andtris(hydroxymethyl)aminomethane(THMA)anddenotedasCMMT,Cloisite30BandOMMT,respectively.MT2ETOHandTHMAcontainhydroxylgroups,whileTHMAdoesnothavelongaliphatictailinitsmolecule.X-raydiffractionandtransmissionelectronmicroscopyshowthatOMMTandCloisite30BcanbepartiallyexfoliatedintheRPUFnanocompositesbecausetheirintercalatingagentsMT2ETOHandTHMAcanreactwithisocyanate.However,CMMTmodifiedwithnonreactiveCTABismainlyintercalatedintheRPUFmatrices.Atarelativelylowfillercontent,theRPUF/CMMTcompositefoamhasahigherspecificcompressivestrength(theratioofcompressivestrengthagainsttheapparentdensityofthefoams),whileatrelativelyhighfillercontents,RPUF/Cloisite30BandRPUF/OMMTcompositeshavehigherspecificcompressivestrengths,highermodulusandmoreuniformporesizethantheRPUF/CMMTcomposite.

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简介：Aseriesofacrylic-basedsuperabsorbentresinsweresynthesizedbyinversesuspensionpolymerization,usingpotassiumpersulfateastheinitiator,N,N′-methylenebisacrylamide(BIS)anddivinylbenzene(DVB)asthemultiplecrosslinkingagents.ThemorphologyoftheresultingsuperabsorbentresinsrevealedbySEMdemonstratedthatahardshelllayerwasindeedformedduetosurfacecrosslinking.Theswellinganddeswellingproperties,andthemechanicalstrengthofsuperabsorbentswereinvestigated.TheresultsindicatedthattheaddingtimeofDVBandtheamountofDVBparticipatedinthecrosslinkingshowasignificantinfluenceonthepropertiesofsuperabsorbents.WhenDVBwasaddedinpolymerizationlater,theamountofDVBparticipatedinreactiondecreasesandthesurfacecrosslinkedshellbecomesthinner.ItissuitableforDVBtobeintroducedinthelaterstageofthepolymerizationprocess,becausetheabsorptionrateofresinisefficientlyimprovedinconjunctionwithhigherwaterabsorption.Furthermore,itwasfoundthatthemechanicalstrengthofswollensuperabsorbentwithsurfacecrosslinkingwasindeedenhancedincomparisonwiththatoftheconventionalone.

简介：Efficientdeep-redorganiclight-emittingdiodes(OLEDs)wereinvestigatedbasedontheblendofpoly[2-methoxy-5-(2'-ethyl-hexyloxy)-l,4-phenylenevinylene](MEH-PPV)with4,7-bis(5-(7-(9H-carbazol-9-yl)-9,9-dioctyl-9H-fluoren-2-yl)thiophen-2-yl)benzo[c][1,2,5]thiadiazole(compound1).Byoptimizingtheblendratio,theturn-onvoltageofthedeviceswassignificantlyreducedfrom4.9Vto2.4V.Ahighestexternalquantumefficiencyof2.56%wasachievedatablendratioof95:5(wt)forcompound1:MEH-PPV.TheCIEcoordinatewasmeasuredtobe(0.70,0.30),withtheluminescencepeakataround680nm.Basedonexperimentalobservationstheimprovementmechanismisdescribed.

简介：Fivefluorine-containingvinylethermonomerswerepreparedbythereactionbetween2-vinyloxyethanol,afluorinatedalcoholandhexafluorobenzeneinthepresenceofsodiumhydrideindimethylformamide.Tworepresentativepropertiesofthesemonomers,UV-curingbehaviorinitiatedbyacationicphoto-initiatorPAG201andsurfacefreeenergyofcoatingfilms,wereinvestigated.Photo-polymerizationproceededbothrapidlyandcompletelywithahighdouble-bondconversion(>90%)andafastcuringrate(maximumcuringtime<21s)forthreemonomers.Thesurfaceenergiesofthemonomersandtheresultingpolymerfilmsweretheninvestigated.TheminimumsurfacefreeenergyoftheUV-curedhomopolymerfilmsreaches7.1mJ/m2.X-rayphotoelectronspectroscopydatashowthatthelowsurfacetensionisinfluencedbyfluorinecontentinthesoftsegmentsandfluorinatedchains'migrationtothesurface.Thefivemonomersexhibitlowviscosity,lowsurfaceenergy,goodthermalstabilityandgoodphoto-polymerizationproperties,whichmakethemgreatcandidatesforUVcoatingandphotoresistapplications.

简介：Thechemicalgraftingofthiolterminatedpoly（sodiumstyrenesulfonate）（HS-PSSS）chainsfromsodiumnitrate（NaNO3）saltsolutiontoagoldsurfacewasinvestigatedwithaquartzcrystalmicrobalancewithdissipationmonitoring（QCM-D）indifferentsaltconcentrations.ItwasfoundthatatlowsaltconcentrationgraftingdensityofHS-PSSSwaslowandthegraftedchainsadoptedamushroomconformation.Withtheincreaseofsaltconcentrationpolyelectrolytechainsunderwentatransitiontowardcoiledstateduetoreductionofelectrostaticrepulsionandasaresultmorechainsweregraftedonthesurface.WhenthegraftingdensityreachedacertainlimitafterwhichfurthergraftingcausedrepulsionbetweenalreadygraftedHS-PSSSchainsandasaresultgraftedchainsadoptedabrushconformation.

简介：Ithasbeenwellknownthatfluorinatedpolyurethanesexhibituniquelylowsurfaceenergy,biocompatibilityandbiostability,thermalandoxidativestabilityandnonstickingbehavior.Consequently,thesepolymershaveattractedconsiderableinterest.However,themechanicalpropertiesoffluorinatedpolyurethanesusuallydeclinewithincreasingfluorinecontents.Theblendingoffluorinatedpolyurethaneswithnormalpolyurethanewascarriedouttoachievebalancedmechanicalandsurfaceproperties.Itwasfoundthatpolyurethanewithgoodmechanicalpropertiesandlowsurfaceenergycanbeobtainedbyaddingasmallamountoffluorinatedpolyurethane.Thefluorinatedsidechainscaneasilymigratetouppermostsurfacesoftheblendsuntillthefluorinelevelatthesurfacebecomesalmostsaturated.Ithasbeenshownfromcontactangle,XPSandAFMmeasurementsthatonlyaslittleas0.34wt%offluorinelevelisenoughtoproduceasurfacesaturatedwithfluorine,andthefluorinelevelattheuppermostsurfaceisonehundredtimeshigherthanthatintheblendbulk.Thefinaloutersurfacestructuresofthepolyurethaneblendwereindependentofthecontentofthefluorinatedpolyurethaneintheblendsduetothesurfacessaturatedbyfluorine.

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简介：PolysaccharidecoatedPLAnanoparticlesbearingaldehydegroupswerepreparedbydialysisofDMSOsolutionofcholesterolhydrophobic-modifieddextranpolyaldehydeandPLAagainstwater.Theaveragediameterofthenanoparticleswasabout160nm,andthesizedistributionwasnearlyhomogenous.ThenanoparticleswerefunctionalizedsimultaneouslywithCD71andEGFRantibodythroughtheSchiff'sbasereaction,andthenradiolabeledwith~(99m)Tc.Afterperfusedtheradiolabelednanoparticlesintotumor-bearing...

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简介：Polymerizable离子的液体共聚物PMMA-co-BVIm-Br被激进的聚合技术综合，并且由Fourier变换描绘了红外线的spectrometryFTIR，<啜class=“a-plus-plus”>1H原子磁性的回声<啜class=“a-plus-plus”>1H-NMR和胶化浸透层析GPC。产生共聚物被用来经由一个阶段倒置方法准备polyvinylidene氟化物PVDF混合膜。多型性，表面wettability和混合膜的希腊语的第六个字母潜力上的共聚物的效果被ATR-FTIR，接触角度仪器和希腊语的第六个字母潜力分析器调查。扫描电子显微镜学SEM和SEMedition也被使用调查形态学和制作的膜的表面元素变化。结果显示那PMMA-co-BVIm-Br共聚物在让混合膜在试验性的pH范围期间有积极表面的膜的表面上存在。共聚物也赞成在PVDF膜的水晶阶段的形成。接触角度实验显示那PMMA-co-BVIm-Br共聚物能交换混合膜的wettability从对吸水由交换Br恐水病<啜class=“a-plus-plus”>有PF的阴离子<潜水艇class=“a-plus-plus”>6<啜class=“a-plus-plus”>。与纯PVDF膜相比，混合膜的水流动和水恢复流动显然被提高。从流动恢复比率FR和全部的犯规比率R的结果<潜水艇class=“a-plus-plus”>t都建议混合膜有好犯规反的性质。

简介：Theuniformsurfaceion-imprintedresinsforZn2+astheimprintingguestwerepreparedbyemulsifier-freeemulsionpolymerizationutilizingallyphenylhydrogenphosphateasafunctionalcomonomer.TheZn2+-imprintedresinadsorbedZn2+muchmoreeffectivelythandidtheunimprintedone.Theselectivefeatureofthesurfaceimprintedresinstothetemplateionswasdemonstrated.