简介:Watersolubleconductingpolyanilinewithelectricalconductivityof10-1-10-2S/cmwaspreparedemployingdopantinducedwatersolubilitytechnology.Thewaterresistanceoftheconductingfilmwassignificantlyimprovedemployingsol-gelhybridsmethod,especiallywhentheconductivepolyanilineloadingwasbelow30wt%.Thereasonfortheimprovementisthattheconductingpolyanilinechainsareconfinedinastableinorganicnetwork.
简介:Thefiniteelementformulationforanalyzingstaticdamagenearaconductingcrackinathinpiezoelectricplateisestablishedfromthevirtualworkprincipleofpiezoelectricity.Thedamagefieldsundervariousmechanicalandelectricalloadsarecalculatedcarefullybyusinganeffectiveiterativeprocedure.Thenumericalresultsshowthatallthedamagefieldsaroundacracktiparefan-shapedandtheelectricfieldappliedhasgreatinfluenceonthemechanicaldamage,whichisrelatedtothepiezoelectricproperties.
简介:电容表演poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT-PSS)超分子的hydrogels系统地被调查了。材料显示出67F/g的一个特定的电容并且在周期的voltammogram大小象5000mV/s一样高以扫描率显示优秀的率能力,由好周期稳定性伴随了。根据microscale形态学,特定的区域和电的传导性的大小,为电气化学的性质的改进的机制被讨论并且归功于到hydrogels的新奇多孔的微观结构和僵硬PEDOT和软PSS部件的合作效果。而且,polyaniline(平底锅)通过一个界面的聚合过程与PEDOT-PSShydrogels被加重,赋予hydrogel材料以以5000mV/s的扫描率的160F/g的一个更高特定的电容。这个工作的意义躺在一个新奇方法的示范解决在电气化学的应用进行聚合物的问题。
简介:无
简介:Asimplifiedclosed-formanalyticsolutionforUWBimpulsesignaltransmittingthroughafinitelyconductingslabisproposed.Theapproachfirstrequiresevaluatingtheimpulseresponseoftheslabandthenconvolvingitwiththespecifiedincidentfieldwaveform.Toobtaintheimpulsivetransmittingfield,eitherforverticalorhorizontalpolarization,approximationstotherefractioncoefficientsandpropagationlossaremade,whichcanbeprovedtobeaccurateenough,comparingwiththeirfrequencydomainsolutions.Thereby,itpermitssimplifiedclosed-formexpressionsinthetimedomainforbothterms.Theresultingtransientresponseforthetransmittingimpulsefieldisthengivenbyconvolutionofthetimedomainrefractioncoefficientsandtimedomainpropagationloss.Anumericalexampleofanincidentmonocycletransmittingthroughaslabusingthistechnique,ispresented,toillustratetheeffectiveuseofthemethod.
简介:Inco-ionicconductingsolidoxidefuelcell(SOFC),bothoxygenion(O2)andproton(H+)cantransportthroughtheelectrolyte,generatingsteaminboththean-odeandcathode.ThusthemasstransportphenomenonintheelectrodesisquitedifferentfromthatinconventionalSOFCwithoxygenionconductingelectrolyte(O-SOFC)orwithprotonconductingelectrolyte(H-SOFC).Thegenerationofsteaminbothelectrodesalsoaffectstheconcentrationover-potentiallossandfurthertheSOFCperformance.However,nodetailedmodelingstudyonSOFCswithco-ionicelectrolytehasbeenreportedyet.Inthispaper,anewmathematicalmodelforSOFCbasedonco-ionicelectrolytewasdevelopedtopredictitsactualperformanceconsideringthreemajorkindsofoverpotentials.Ohm'slawandtheButler-Volmerformulawereusedtomodeltheionconductionandelectrochemicalreactions,respectively.Thedustygasmodel(DGM)wasemployedtosimulatethemasstransportprocessesintheporouselectrodes.Parametricsimulationswereperformedtoinvestigatetheeffectsofprotontransfernumber(tH)andcurrentdensity(jtotal)onthecellperformance.Itisinterestingtofindthattheco-ionicconductingSOFCcouldperformbetterthanO-SOFCandH-SOFCbychoosinganappropriateprotontransfernumber.Inaddition,theco-ionicSOFCshowssmallerdifferencebetweentheanodeandcathodeconcentrationoverpotentialsthanO-SOFCandH-SOFCatcertaintHvalues.TheresultscouldhelpmaterialselectionforenhancingSOFCperformance.
简介:MethodofVSC(VoltageShortedCompaction)canbeusedtodeterminetheintrinsictemperaturedependenceofconductivityofpolycrystallinecompaction.TheexperimentalconditionsandtechnicalkeyforpreparationofVSCdeviceanditsphysicalmodelaswellasitsapplicationsinconductingpolymersarediscussedindetail.
简介:Numericalsimulationsareperformedforlaminarnaturalconvectionheattransferfromacenteredconductingbodyenclosedinasquarecavity.Ahighaccuracyunsteadynumericalmethodisused,combiningtheuniqueconditionofthepressure,theconvergentsolutionsandthestream-functionvalueoftheinsideheat-conductingbodyaregivensimultaneously.Twoexamplesaresimulatedwiththisnumericalmethodandcomparedwiththeexperimentalresults.Theresultsofthenumericalsolutionsareconsistentwiththeexperimentalresults.Itshowsthatthenumericalmethodisvalidandfeasible.
简介:Significantenhancementofthermoelectricper-formancewasobservedforPoly(3,4-ethylene-dioxythiophene):Poly(4-styrenesulfonic)(PEDOT:PSS)andmulti-walledcarbonnanotubes(MWCNTs)(PC)three-dimensionalaerogelswhichwereobtainedfromPEDOT:PSS/MWCNTssuspensionsbyaddingdifferentconcentrationsof
简介:Aseriesofnovelamphibiousorganic/inorganichybridprotonexchangemembraneswithH3PO4dopedwhichcouldbeusedunderbothwetanddryconditionswaspreparedthroughasol-gelprocessbasedonacrylatedtriethoxysilane(A-TES)andbenzyltetrazole-modifiedtriethoxysilane(BT-TES).Thedual-curingapproachincludingUV-curingandthermalcuringwasusedtoobtainthecrosslinkedmembranes.Polyethyleneglycol(400)diacrylate(PEGDA)wasusedasanoligomertoformthepolymericmatrix.Themolecularstructuresofprecursorswerecharacterizedby1H,13Cand29SiNMRspectra.Thethermogravimetricanalysis(TGA)resultsshowthatthemembranesexhibitacceptablethermalstabilityfortheirapplicationatabove200oC.Thedifferentialscanningcalorimeter(DSC)determinationindicatesthatthecrosslinkedmembraneswiththemassratiosofbelow1.6ofBT-TEStoA-TESandthesamemassofH3PO4dopedasthatofA-TESpossessthe-Tgs,andthelowestTg(-28.9℃)existsforthemembranewithdoublemassofH3PO4dopedaswell.Thehighprotonconductivityinarangeof9.4―17.3mS/cmwiththecorrespondingwateruptakeof19.1%―32.8%ofthemembraneswasdetectedat90oCunderwetconditions.Meanwhile,theprotonconductivityinadryenvironmentforthemembranewithamassratioof2.4ofBT-TEStoA-TESanddoubleH3PO4loadingincreasesfrom4.89×10-2mS/cmat30℃to25.7mS/cmat140℃.Theexcellentprotontransportabilityunderbothhydrousandanhydrousconditionsdemonstratesapotentialapplicationinthepolymerelectrolytemembranefuelcells.
简介:Differentoxygenandnitrogencontainingfunctionalgroupswerecreatedonthesurfaceofthemultiwalledcarbonnanotubes.Themulti-walledcarbonnanotubesweretreatedinultrasonicbathwithsulfuricornitricacid.Furthermorethesurfacetexturewasmodifiedbyincreaseoftheroughness.Inparticularaftertreatmentwiththeoxidizingnitricacid,incomparisontotheH_2SO_4orultra-sonictreatedsamples,cratersandedgesaredominatingthesurfacestructures.Manganeseoxidewasdepositedonthemultiwalledcarbonnanotubesbyprecipitationmechanism.Variousmanganeseoxidesareformedduringthedepositionprocess.Thesampleswerecharacterizedbyelementalanalysis,microscopy,thermalanalysis,Ramanspectroscopy,andbythezetapotentialaswellasX-raydiffractionmeasurements.Itwasshownthatthedepositedmanganeseoxidesarestabilizedratherbysurfacetextureofthemulti-walledcarbonnanotubesthanbycreatedfunctionalgroups.