简介:Luminescentpolystyrenemicrosphereswereeasilyfabricatedfrompoly(styrene-co-methacrylicacid)andaqueousRE(III)chloridesolution(RE=Eu,Tb)inthepresenceof2,20-bipyridineassecondligand.Thenegativechargesofcarboxylgroupsonthesurfaceofmicrospherescoordinatedwithrareearthionsatfirst,suchascomplexescovalentlylinkedto2,20-bipyridine,resultinginstrongphotoluminescence.Variousmethods,includingtransmissionelectronmicroscope(TEM),scanningelectronmicroscope(SEM),energydispersivespectroscopy(EDS),Fouriertransforminfraredspectroscopy(FT-IR),andfluorescencespectrophotometer,wereusedtocharacterizetheresultantpolystyrenecompositemicrospheres.Thisworkhighlightstheideathatitisfaciletosynthesisluminescentmicrospheresbysurface-modifiedmethoddirectly.
简介:采用光学显微镜和场发射扫描电镜,研究超声波对原位Mg2Si/Al复合材料中初生Mg2Si形态的影响。研究结果表明:超声波处理使初生Mg2Si的晶粒尺寸从150μm降低到20μm,初生Mg2Si形态发生改变。在二维形貌中,未实施超声波振动处理的初生Mg2Si晶粒生长为含有空腔的粗大颗粒,共晶组织生长于其中,相应的三维形态为含有漏斗状空腔的八面体和十四面体。超声波处理后的初生Mg2Si晶粒变成细小、实心三维形态的颗粒,颗粒棱角已发生钝化效应。
简介:Theobjectiveofthisresearchistopreparespeciallydesignedsurfacetextureonhardsteelsurfacebyelectrochemicalmicromachining(EM)andtoincorporateelectrolessplatedAg/MoS2solidlubricantcoatingintothedimplesofEMtexturedsteelsurfacetoeffectivelyreducefrictionandwearofsteel-steelcontacts.ThefrictionandwearbehavioroftheAg/MoS2solidlubricantcoatingonEMtexturedsteelsurfacewasevaluatedinrelationtothesizeandspacingofthedimplesthereon.Themicrostructur...
简介:ZrO2-SnO2compositenanoparticleswerepreparedbyheatingthehydrateprecursorssynthesizedbythechemicalco-precipitationreactionofZrOCl2andSnCl4.Theprecursorswereexaminedbydifferentialthermalanalysis(DTA)andthermogravimetricanalysis(TGA).ThecompositepowderwascharacterizedusingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM)anddesorptionisotherm(Barrett-Joyner-Halendamethod).Theaveragecrystalsizeofthenanoparticlerangesfrom15to30nmforthesamplecontaining5%-25%ZrO2(massfraction).MostoftheporesintheZrO2-SnO2nanoparficlesareabout10-20nmindiameter.Thecompositepowderispromisingforchemicalsensors.
简介:[埃及土人_(1.5nm)/ZrO_(2xnm)]_(10)多层的电影被磁控管劈啪作响在玻璃底层上扔然后为30min在600℃在真空退火了。他们的结构和磁性作为ZrO_2内容的功能被调查。结果证明谷物尺寸和coercivity首先随ZrO_2内容的增加增加然后减少。Themaximumcoercivity和谷物尺寸在ZrO_2的37vol.%被获得。在这部电影的ZrO_2的内容在埃及土人谷物的分离并且在intergrainexchange相互作用的减小起一个重要作用。根据尖依赖coercivity的研究,埃及土人的磁化颠倒拍摄与,这被发现(111)质地与领域墙运动或旋转模式的S-W类型不同。
简介:SpatialDistributionofEL2DefectinSemi-insulatingGaAsRuQiongna;LiGuangpingandHeXiukun(汝琼娜)(李光平)(何秀坤)(TianjngElectronicMaterials...
简介:BasedonthetechniqueforpreparingLaCl3viadirectpyrolysisofrareearthchloridesolution,ajetpyrolysisreactorwasdesignedandtheintra-reactortemperatureandchemicalreactionswerenumericallysimulatedusingcomputationalfluiddynamics(CFD)technique.Theresultsshowthattheflowratevariationatthefuelinletdoesnotlargelyaffectthetemperatureinthereactor,whiletheincreaseinexternalpressureatthematerialinletrapidlydecreasestheaveragetemperature,Venturitemperature,andoutlettemperature.TheCH4andO2insidethereactorarecombustedcompletely,andwhenthematerialinletpressureis\90Pa,theLaCl3isfullypyrogenated.ThecontentsofCO2,La2O3,andHClfluctuateneartheVenturitubeandfinallystabilize.La2O3contentattheoutletisinatop-to-bottomgradient.
简介:Thecorrosionbehaviorandanti-corrosionmechanismoftheZn-Ni-Al2O3compositecoatingwereinvestigatedbySEM,EDSandXPS.TheresultsindicatethatthecorrosiontypeoftheZn-Ni-Al2O3coatingsinneutral5wt.%NaClsolutionisuniformcorrosion.ThepresenceofcompactanduniformlydispersednanoaluminaparticlessubstantiallyinhibitsthecorrosionofZn-Ni-Al2O3compositecoatings.Intheinitialcorrosionstage,thecorrosiveproductsofZn-NimatrixformacompactZnCl2·4Zn(OH)2layer.Withthedevelopmentofcorrosion,somenanoaluminaparticlesareembeddedandformaNienrichmentlayer.InNienrichmentlayer,NipresentsasNiandNiO.
简介:Fe2O3和ZnO的粉末混合物是在一家高精力的行星的球工厂的milled综合ZnFe2O4和X光检查粉末diffractometry被用来获得阶段,雏晶尺寸和Fe2O3和ZnFe2O4的microstrain的相对内容。Fe2O3的格子常数被房间精炼方法获得。macrokinetics和事的结构进化被学习,结果证明ZnFe2O4的mechanochemical合成的动力学过程适合Avrami-Erofe'ev模型并且被成核生长机制,和结构的macrokinetics理论在燃烧合成研究控制区域能被用来也描述运动过程。
简介:WehavecalculatedtheelectronicstructuresofCo2FeAl1-xSix(101)surfaceusingfirst-principlesmethodbasedonthedensityfunctionaltheory.Becauseofthesurfaceeffect,theminorityspinbandgapattheFermileveldisappearsatthesurfaceofbulkCo2FeAl1-xSix.However,beneaththesurface,theminorityspingapopensattheFermilevel,whichindicatesthattheelectronicstructuresofCo2FeAl1-xSix(101)be-comeclosetothatofbulkphase.Accordingly,theCo2FeAl1-xSix(101)surfaceisacompositetri-layerstructurethatcorrespondstotheweakeningofhalf-metallicpropertyinCo2FeAl1-xSixfilms.Eventhough,thespinpolarizationofCo2FeAl1-xSix(101)surfaceisstilllargerthanthatofCo2FeAlorCo2FeSimaterials,makingCo2FeAl1-xSixapromisingspintronicsmaterial.