简介:DyPt2filmswerepreparedbyalternatedepositionthinDyandPtlayersonglasssubstratesbyDCmagnetocontrolledsputteringmethod.TheXRDdataindicatedthatforas-depositedDy/Ptfilms,andtheperiodiclayeredstructuresalongthicknessdirectionwereevidencedwithlowangleX-rayscattering.Withincreasingannealingtemperature,thecompoundsofDyPt,DyPt2andDyPt3wereformedsuccessivelyattemperaturerangingfrom300to400℃.ItwasfoundthatthecompositionreactionDyPt+DyPt3→2DyPt2tookplaceat500℃.Afterannealingat500℃for1h,thecompoundsDyPtandDyPt3transformedcompletelyintotheDyPt2compound.
简介:Forthegoalofsulfurrecovery,mostmethodsareaimedatthetailgaswithhigh-concentrationH2S,butfeweffectivemethodsareusedforlow-concentrationH2S.Inthiswork,Low-concentrationH2Scouldbepurifiedwellbyliquidphasecatalyticoxidation(LCO),andthesulfurresourcecouldalsoberecovered.TheabsorptionsolutionwaspreparedbyFeCl3andsulfosalicylicacid.Undertheexperimentalconditions,theconversionofH2StoScouldbemaintainedabove94%at60℃.InordertoenhancetheeconomicalefficiencyofLCOmethod,theabsorptionsolutionwasmodifiedbydopingCe,andaseriesofexperimentsweredesignedtoinvestigateitsperformance.TheresultsshowedthattheconversionofH2Shadnoobviousimprovement,butabove98%conversioncouldbegainedat60℃,andtheH2Sconversionratewasenhanced.TheoptimumadditionqualityofCe(NO3)3was0.08gto50mlFe3+solution.
简介:TheeffectsofUVAphotoirradiatedCe(Ⅳ)dopedTiO2nanoparticle(CDTP)onratcoloncarcinomacellline(C26)growth,cellcycledistribution,andmorphologywerestudiedbyMTTassay,FlowCytometry,andfluorescentstaining.Theresultsindicatethatabout64.6%cellsarekilledafter24hby180μg·ml-1CDTPwhen8minexposedtoUVA,over90%deadfor30mingroup,relativeto18.7%,41.5%ofTiO2atthesameconditionrespectively.Hoe33258stainingofthefixedcellsrevealstypicalapoptoticstructures(apoptoticbodies),andcellsarearrestedinG0/G1phase.
简介:ThemorphologyandcorrosionbehaviorofNi/Al2O3compositecoatingspreparedusingdouble-pulsedelectrodepositingtechniqueafteroxidizedunder800℃NaCldepositinairenvironmentwereanalyzedbyscanningelectricalmicroscope(SEM),X-raydiffraction(XRD)andenergydispersivespectrum(EDS).TheresultsshowedthatthecorrosionofallcompositecoatingswasacceleratedunderNaCldeposits,andthecorrosionproductswereratherporouswithpooradherencetothematrix.Al2O3particlesinthecoatingscanrefinethegrainsizeandimprovethehightemperaturecorrosionresistanceofthecoatings.Withinthetestscope,themoreAl2O3particlesinthecoatings,thelowercorrosionratescouldbeobtained,andthecorrosionmechanismwasalsodiscussed.
简介:SinglephaseofBa1-xMgAl10O17:xEu2+(0.02≤x≤0.14)phosphorswasfirstsuccessfullypreparedbyco-precipitationinaqueousmediumwitha'reversestrike'method,usingoxalicacidandammoniatogetherasprecipitants.Completelycrystallizedphosphorswereobtainedat1300℃,whichis300℃lowerthanthetemperatureofsolid-statereaction.TheirphotoluminescencewasinvestigatedunderUVandVUVregion,respectively.TheemissionspectraofBa1-xMgAl10O17:xEu2+samplesexcitedby254or147nmshowedacharacteristicwidebandwiththepeakcentredatabout450~454nm.Optimumemissionintensityreachedatx=0.1andthenconcentrationquenchingoccurred.Thesynthesizedphosphorshows10%higheremissionintensitythanthatpreparedbysolid-statereaction.
简介:Ba0.85Ca0.15Ti0.9Zr0.1O3(BCTZ)lead-freepiezoelectricceramicsco-dopedwithCeO2(x=0.1wt.%,0.2wt.%,0.3wt.%,0.4wt.%,0.5wt.%)andLi2CO3(0.6wt.%)werepreparedbyconventionalsolid-statereactionmethod.InfluenceofCeO2dopingamountonthepiezoelectricproperties,dielectricproperties,phasecompositionandmicrostructureofpreparedBCTZlead-freepiezoelectricceramicsdopedwithLi2CO3wereinvestigatedbyX-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)andotheranalyticalmethods.TheresultsshowedthatthesinteredtemperatureofBCTZlead-freepiezoelectricceramicsdopedwithCeO2decreasedgreatlywhenLi2CO3dopingamountwas0.6wt.%;apureperovskitestructureofBCTZlead-freepiezoelectricceramicsco-dopedwithLi2CO3andCeO2andsinteredat1050°Ccouldalsobeobtained.Thepiezoelectricconstant(d33),therelativepermittivity(εr)andtheplanarelectromechanicalcouplingfactor(kp)ofBCTZceramicsdopedwithLi2CO3increasedfirstlyandthendecreased,thedielectricloss(tanδ)decreasedfirstlyandthenincreasedanddecreasedatlastwhenCeO2dopingamountincreased.TheinfluenceofCeO2dopingonthepropertiesofBCTZlead-freepiezoelectricceramicsdopedwithLi2CO3werecausedby'softeffect'and'hardeffect'piezoelectricadditiveandcausinglatticedistortion.WhenCeO2dopingamount(x)was0.2wt.%,theBCTZceramicsdopedwithLi2CO3(0.6wt.%)andsinteredat1050°Cpossessedthebestpiezoelectricpropertyanddielectricpropertywithd33of436pC/N,kpof48.3%,εrof3650,tanδof1.5%.