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简介：ThemonolayerdispersionofcopperoxideonthesurfaceofanataseanditseffectonthepropertieshavebeenstudiedbyX-rayphotoelectronspectroscopy(XPS)andX-rayextendedabsorptionfinestructure(EXAFS).XPSresultsgiveanutmostdispersioncapacityof7.2mg/gTiO2.StronginteractionsbetweencopperoxideandanatasecanbeseenfromEXAFSresults.ThestructureofthesupportedCuOspeciesisstronglydependentontheamountofCuOloading.WhenthecontentofCuOloadingisbelowtheutmostdispersioncapacity,thesurfaceofCuO/TiO2isdominatedbythehighlydispersedCuOspecieshavingno-Cu-O-Cu-chains,Thecopperionislocatedinanoctahedralcoordinationenvironment,andtheCu－O-coordinationdistanceismuchlongerthanthatinpurecrystallineCuO,whenCuOloadingisexceedstheutmostdispersioncapacity,crystallineCuOisformedonthesurfaceofCuO/TiO2,Fromtheresultofthesturcturestudy,itisCu-OoctahedralCoordinationandcoordinationdistancechangeincomparationwithpurecrystallineCuoonthesurfaceCuO/TiO2thathavecatalyticactivity.

简介：Probingtheopticalpropertiesofmolybdenumdisulfide（MoS2）isvitaltoitsapplicationinplasmon-enhancedspectroscopy,catalysts,sensing,andoptoelectronicdevices.Inthispaper,wetheoreticallystudiedtheRamanandfluorescencepropertiesofmonolayerMoS2usingtip-enhancedspectroscopy（TES）.Inthestrong-couplingTESsystem,theRamanandfluorescenceenhancementfactorscanbeturnedtoashighas4.5×108and3.3×103,respectively,byoptimizingthetip–MoS2-filmdistance.OurtheoreticalresultsnotonlyhelptodeeplyunderstandtheTESpropertiesofmonolayerMoS2,butalsoprovidebetterguidanceontheapplicationsofthenoveltwo-dimensionalmaterial.

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简介：多层的铱涂层在钨上被生产由双发光的碳化物底层血浆过程。作为比较，单层也被生产。微观结构和形态学用扫描电子显微镜学被观察。谷物取向和阶段用X光检查衍射被决定。涂层的剩余压力被学习旁边看一眼的发生X光检查衍射。涂层的粘合剂力量被一个擦伤测试者测量。结果显示出那单层并且多层有一个多晶的阶段与一强壮(110)思考。涂层没有分层的证据有优秀粘附。单层的粘合剂力量并且多层分别地是大约50和43N。在底层和层之间的界面的反应发生了，一个新WIr阶段由于高温度的免职过程被发现。在单层的剩余压力并且多层分别地是-1.6和-1.1GPa。

简介：Ingraphene,conductanceelectronsbehaveasmasslessrelativisticparticlesandobeyananalogueoftheDiracequationintwodimensionswithachiralnature.Forthisreason,theboundingofelectronsingrapheneintheformofgeometriesofquantumdotsisimpossible.Ingaplessgraphene,duetoitsuniqueelectronicbandstructure,thereisaminimalconductivityatDiracpoints,thatis,inthelimitofzerodoping.Thiscreatesaproblemforusingsuchahighlymotivatednewmaterialinelectronicdevices.Oneofthewaystoovercomethisproblemisthecreationofabandgapinthegraphenebandstructure,whichismadebyinversionsymmetrybreaking(symmetryofsublattices).WeinvestigatetheconfinedstatesofthemasslessDiracfermionsinanimpuredgraphenebytheshort-rangeperturbationsfor"localchemicalpotential"and"localgap".Thecalculatedenergyspectrumexhibitsquitedifferentfeatureswithandwithouttheperturbations.Acharacteristicequationforboundstates(BSs)hasbeenobtained.Itissurprisinglyfoundthattherelationbetweentheradialfunctionsofsublatticeswavefunctions,i.e.,f_m~+(r),g_m~+(r),andf_m~-(r),g_m~-(r),canbeestablishedbySO(2)group.

简介：Itiswellknownthatelectrochemicaloxidationofanilinedissolvedinelectrolytesolutionsisaveryusefulmethodforpreparingpolyanilinefilmsonelectrodes’.However,itisverydifficultforthismethodtoprepareauniformmonolayerpolymersincelocalnucleationandgrowthofpolyme...

简介：Mercaptopropyltrimethoxysilane(MPTS)bearingmercaptogroupswasusedtoformself-assemblymonolayers(SAMs)onglasssubstratesbysolutionextraction.SEM,XRDandrubbingtestanalysisillustratedthattheAgfilmontheSAMs-modifiedglasswasmoredurablethanthatonthecommonly-modifiedglassandthatthecrystallinityofAgfilmontheSAMs-modifiedglasswasidenticalwiththoseoftheAgfilmonthecommonly-modifiedglassandpureAg.

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简介：Insituphotochromicprocessinthemonolayerofaphotochromicspiropyranderivativewithoutlongalkylchain,wasinvestigated.Thephotochromismattheair/waterinterfaceunderdiffernetsurfacepressureswasstudiedbysurfacepressure-areaisotherms,surfacepressure-timecurves,area-timecurvesandBrewsteranglemicroscopy.Bothformsofthecompoundwerefoundtoformmonolayersattheair/waterinterfacealthouhgitdoesnothavelongalkylchain.Alargeareaexpansioninthemonolayercorrespondingtoazreo^thorderreactionwasfoundattheinitialstageoftheUVlightirradiation.Aseriesofdynamicinvestigationsrevealedthatathighpressureafterphasetransitioninthemonolayer,thesurfacepressurechangesgreatlyumderalternativeirradiationofUVandvisiblelight.Anobviousmorphologicalchangeaccompanyingwiththephotochromismwasobservedinsitu.

简介：Entangledphotonsarethefundamentalresourceinquantuminformationprocessing.Howtoproducethemefficientlyhasalwaysbeenamatterofconcern.HereweproposeanewwaytoproducecorrelatedphotonsefficientlyfrommonolayerWS2basedonboundstatesinthecontinuum(BICs).TheBICsofradiationmodesinthemonolayerWS2arerealizedbydesigningthephotoniccrystalslab-WS2-slabstructure.Thegenerationefficiencyofcorrelatedphotonpairsfromsuchastructurehasbeenstudiedbyusingarigorousquantummodelofspontaneousparametricdown-conversionwiththeplanewaveexpansionmethod.ItisfoundthatthegenerationefficiencyofcorrelatedphotonpairsisgreatlyimprovedifthesignalandidlerfieldsarelocatedattheBICsdeterminedbytheinversescatteringmatrixofthestructure.Thisisincontrasttotheparametricdown-conversionprocessfortheenhancedgenerationofnonlinearwavesifthepumpfieldislocatedattheBICsdeterminedbythescatteringmatrixofthestructure.Thegenerationrateofthecorrelatedphotonpairscanbeimprovedby7ordersofmagnitudeinsomedesignedstructures.Thegeneratedquantumsignalsaresensitivetothewavelengthandexhibitnarrowedrelativelinewidth,whichisverybeneficialforquantuminformationprocessing.

简介：ＳｔｕｄｉｅｓｏｎｔｈｅＥｌｅｃｔｒｏｎＴｒａｎｓｆｅｒＣｅｎｔｅｒｓｏｆＡｍｉｎｏＯｘｉｄａｓｅＩｍｍｏｂｉｌｉｚｅｄｏｎＳｅｌｆ┐ＡｓｅｍｂｌｙＭｏｎｏｌａｙｅｒＵｓｉｎｇＥｌｅｃｔｒｏｃｈｅｍｉｃａｌＭｅｔｈｏｄｓ＊ＬＩＪｉｎｇ－ｈｏｎｇ，ＣＨ...

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简介：Aself-assembledmonolayerfilm(SAM)ofrutheniumphthalocyanine(RuPc)fabricatedonasilversubstratepremodifiedwithanSAMofterephthalonitrile(TPN)wasstudiedbymeansofsurface-enhancedRamanscattering(SERS)andultraviolet-visible(UV-Vis)spectroscopies.TPNwasusedasaligandtolinkRuPcsinceitcannotonlymodifythesilversubstratebutalsodeliverthenitrilegroupsprotrudingfromthesilversurface.Therefore,wecanexploretherelationshipbetweenthestructureandtheorientationofRuPcandtheTPN-modifiedsubstrate.TheUV-VisspectraindicateastronginteractionbetweenRuPcandTPNinthecompositefilm.TheresultisfurtherconfirmedbytheSERSspectraofRuPc-TPNSAM,inwhichthevibrationalbandsarisingfromboththeRuPcandTPNmoietiesappearclearly,indicatingthattheRuPcissuccessfullyassembledontheTPNfilm.

简介：Thefundamentalmomentumconservationrequirementq~0fortheRamanprocessisrelaxedinthenanocrystallites(NCs),andphononsawayfromtheBrillouin-zonecenterwillbeinvolvedintheRamanscattering,whichiswell-knownasthephononconfinementeffectinNCs.ThisusuallygivesadownshiftandasymmetricbroadeningoftheRamanpeakinvariousNCs.Recently,theA'_1modeof1LMoS2NCsisfoundtoexhibitablueshiftandasymmetricbroadeningtowardthehigh-frequencyside[Chem.Soc.Rev.44(2015)2757andPhys.Rev.B91(2015)195411].Inthiswork,wecarefullycheckthisissuebystudyingRamanspectraof1LMoS2NCspreparedbytheionimplantationtechniqueinawiderangeofion-implanteddosage.ThesameconfinementcoefficientisusedforbothE'andA'_1modesin1LMoS_2NCssincethephononuncertaintyinanNCismainlydeterminedbyitsdomainsize.TheasymmetricalbroadeningneartheA′_1andE′modesisattributedtotheappearanceofdefect-activatedphononsatthezoneedgeandtheintrinsicasymmetricalbroadeningofthetwomodes,wheretheanisotropyofphonondispersioncurvesalongΓ-KandΓ-Misalsoconsidered.Thephotoluminescencespectraconfirmtheformationofsmalldomainsizeof1LMoS_2nanocrystallitesintheion-implanted1LMoS_2.Thisstudyprovidesnotonlyanapproachtoquicklyprobephonondispersiontrendsof2DmaterialsawayfromΓbytheRamanscatteringofthecorrespondingNCs,butalsoareferencetocompletelyunderstandtheconfinementeffectofdifferentmodesinvariousnanomaterials.

简介：AIMToexploretheprotectiveeffectsandunderlyingmechanismsoftotalpolysaccharidesoftheSijunzidecoction(TPSJ)ontheepithelialbarriersinvitro.METHODSCaco-2cellmonolayersweretreatedwithorwithoutTPSJinthepresenceorabsenceofTNF-α,andparacellularpermeabilityandtransepithelialelectricalresistance(TEER)weremeasuredtoevaluatetheepithelialbarrierfunction.Immunofluorescenceandwesternblottingwererespectivelyusedtoevaluatethedistributionandexpressionofthetightjunctionproteinsclaudin1,claudin2,zo3,andoccludininCaco-2cells.Westernblottingwasalsousedtoevaluatethecellularexpressionofmyosinlightchain(MLC),phosphorylatedMLC(pMLC),MLCkinase(MLCK),andnuclearfactor(NF)-κBp65.RESULTSTPSJpromotedtheproliferationofCaco-2cellsandinhibitedTNF-α-inducedsecretionofpro-inflammatorycytokines.Furthermore,TPSJsignificantlyamelioratedboththereductionofTEERandtheincreasedparacellularpermeabilityobservedintumornecrosisfactor(TNF)-α-damagedCaco-2monolayers.Furthermore,TPSJremarkablyattenuatedTNF-α-inducedmorphologicalchanges,downregulatedtheexpressionofclaudin1,claudin2,zo3,andoccludin,andmarkedlysuppressedTNF-α-mediatedupregulationofp-MLCandMLCKexpression.Finally,TPSJinhibitedtheactivationandexpressionofNF-κBp65.CONCLUSIONOurresultsdemonstratethatTPSJalleviatestheTNF-α-inducedimpairmentoftheintestinalepithelialcellbarrierfunctionbysuppressingNF-κBp65-mediatedphosphorylationofMLCKandMLC.