简介:Anewμ3-Otriiron(Ⅲ)complex[Fe3O(OBz)6(CH3OH)3](NO3)(CH3OH)2(HOBZ=benzoicacid)hasbeensynthesized,itsstructurehasbeendeterminedandvariabletemperaturemagneticsusceptilityhasalsobeenmeasured.Inthemolecule,threeironatomsformedanequilateraltrianglewithu3-Oincenter.ThefittingtothemagneticsusceptibilityshowedthatanintramolecularantiferromagneticexchangeinteractionoccurredbetweenironatomswithJ=-25.51cm-1,andaweakerintermolecularantiferromagneticexchangeinteractionoccurredwithzJ’=-2.30cm-1.
简介:Fouriertransformedinfraredspectrometry(FTIR)and27AlMagicAnglespinning(MAS)nuclearmagneticresonancespectroscopywereemployedtocharacterizearsenateadsorptiononamorphousAlgelswithKegginstructureatpH=4–10.Thesestudieshaveproventhat:thesurfacecomplexspeciesofarsenateshowsignificantdifferencesunderacidicandalkalineconditions,whichwasdeducedbasedontheAs-Ostretchingvibrationbandslocatedrespectivelyat774and870cm-1;poorlycrystallineAl13(orAl)-arsenateprecipitationcouldbeeasilyformedunderacidmediumconditionandhighloadinglevel,whichwassupportedbycomparingtheAs-Ovibration(at≈732cm-1)ofprecipitationtoadsorbedAlgels;arsenate(AsO43-)adsorptionhasnoeffectontheKegginstructureofAlgelswithbasicity(R)=2.6and3.0,evenathighloadinglevel,asevidencedbythesignalat≈63×10-6ofmagicanglespinning(MAS)-27AlNMR.Theadsorptionenvelopewasdeterminedbyconventionalbatchexperiments.
简介:以便获得两高电镀物品迁居(他们)在高周波的表面的可靠性和罚款维的控制声学的波浪(锯)设备,4-layeredTi/Al-Mo/Ti/Al-Mo电极电影在128°Y-XLiNbO3上被调查由劈啪作响的底层免职。结果显示4-layered电影与常规Al-0.5wt.%Cu电影相比有改进他们可靠性。他们的一生比在5×的当前的密度测试的Al-0.5wt.%Cu电影的长约三倍107A/厘米2和200°C的温度。而且,4-layered电影容易在反应离子蚀刻被蚀刻,罚款维的控制为高周波的锯设备在模式复制期间被认识到。为4-layered电影,最佳瞬间数量和劈啪作响的参数为高他们可靠性是很重要的。
简介:Thedevelopmentofthehydrogenelectrodeisvitalfortheapplicationofalkalinepolymerelectrolytefuelcells(APEFCs).Inthisstudy,aseriesofNi(OH)2decoratedNi/Ccatalysts(Ni(OH)2-Ni/C)werepreparedbyathree-stepelectrochemicaltreatmentofNi/C.TheexistenceofNi(OH)2wasdemonstratedbyX-rayphotoelectronspectroscopy(XPS),andthesurfacemolarratioofNi(OH)2/Niofthesampleswasestimatedviaanelectrochemicalmethod.TheHORcatalyticactivityofthecatalystswasevaluatedbyarotationdiskelectrode(RDE)method,anda'volcanoplot'wasestablishedbetweentheHORexchangecurrent(j0)andthesurfacemolarratioofNi(OH)2/Ni.Ontopofthe'volcano',thesurfacemolarratioofNi(OH)2/Niis1.1:1,thej0ofwhichwas6.8timesofthatofNi/C.ThestabilityofthesamplestowardHORwasevaluatedtobegood.OurstudyaddedasystematicexperimentalevidencetotheHORresearch,showingthattheHORcatalyticactivityofNicanbedeliberatelycontrolledviadecorationofNi(OH)2,whichmayhelpunderstandingtheHORmechanismonNi.
简介:TheconductivitybehaviorofAl(OH)3-acrylamidehybridpolyacrylamide(hybridPAAm)indistilledwaterwasstudied.Adiscontinuityphenomenonoftheconductivity(k)versusconcentration(c)curveofthehybridPAAminacertainconcentrationregimeisfound.ThisphenomenonisdependentonthemolecularweightofthehybridPAAmandontheparticlesizeandcontentoftheAl(OH)3colloidinthehybridPAAm.ThisphenomenonwasaccountedforassumingionizationofthehybridPAAm.
简介:Anisotropicstructures,nanoneedles,andnanospindlesofrareearthhydroxychloride(RE(OH)2Cl)andoxychloride(REOCl)(rareearth=EuandTb)weresynthesized.Therareearthhydroxychloridenanostructureswereformedviaathermallyassistedhydrolysisoftherare-earthsesquioxidenanocrystals.Themorphologicalevolutionofthenanostructureswasstudiedusinghigh-resolutiontransmissionelec-tronmicroscopyandscanningelectronmicroscopy,whilethestructuralevolutionwasinvestigatedusingX-raydiffractiontechniques.Thethermalstabilityoftherareearthhydroxychlorideswasinvestigatedusingthermogravimetricanalysis.Therareearthoxychloridenanospin-dlesweresynthesizedviaasimpleheat-treatmentofrareearthhydroxychloridenanospindles.
简介:在80%Al-20%CuO(质量分数)体系中,通过原位反应法制备Al2O3p-Al复合材料。采用不同方法研究CuO颗粒粒度对复合材料合成温度和显微组织的影响。结果表明,CuO颗粒粒度对Al-CuO体系的完全反应温度有显著影响:含有粒度小于6μmCuO颗粒样品的完全反应温度比含有粒度小于100μmCuO颗粒样品的完全反应温度低200°C。当反应温度低于某一临界值时,原位Al2O3颗粒和Al基体之间不能完全结合;当温度高于某一临界值时,原位Al2O3颗粒的形貌从棒状转变成近球形。这两个临界温度受CuO颗粒粒度的影响:含有粒度小于6μmCuO颗粒样品的临界温度比含有小于100μmCuO颗粒样品的临界温度低100℃。
简介:Thispaperpresentstheprincipleofphasemodulationoftheopticalwave,thatisusingadensefringefamilytomodulateanotherfringepattern,anditsapplicationinfringemultiplication.Itisofuniversalsignificanceinopticallyexperimentalmechanics.
简介:四个参数,煤气的流动,旋转速度,精制时间,和炖的时间的效果,在7075的旋转impeller精炼上,艾尔被学习。C2精制的Cl6,精制的旋转impeller,并且7075艾尔合金的合成精制与对方相比。结果证明旋转impeller精炼的最大的影响参数是旋转速度,由煤气的流动,精制时间,和炖的时间列在后面。直角的分析获得的最佳纯化参数如下:400r/min,0.4mL/h的惰性的煤气的流动,15min的精制时间,和6min的炖的时间的转子速度。最好的排除效果能被C2Cl6和旋转impeller。C2Cl6,旋转impeller,并且合成精制分别地是34.5%,69.2%,和78%。旋转impeller精制的标本的机械性质比由C2精制的Cl6,但是比那些低由合成精制。
简介:TheweldabilityofSiCw/6061Alwasinvestigated.Fromtheresultsofexperiments,itisfoundthatthestrengthofjointismainlyinfluencedbyweldingtemperature,andhighstrengthofjointisobtainedunderweldingtemperaturebetweenliquidusandsolidusofmatrixalloy.DiffusionweldingofSiCw/6061.Alwassuccessfullyrealizedwithappropriateweldingparameters.
简介:Al-pillaredinterlayeredmontmorillonite(Al-PILM)waspreparedusingtheartificialNa-montmorillonitefromtheQingfengshanbentonitemineasastartingmaterialmixedwithAl-pillaringsolutions.ThemicrostructureofthematerialswasstndiedbyanX-raypowderdiffractometerandaFouriertransforminfrared(FTIR)spectrometer.Theresultsindicatedthatthebasalspacing[d(001)value]ofthematerialswasincreasedsignificantlyto1.9194nmrelativetoNa-montmorillonite(1.2182nm).Aftercalcinedfor2hat300℃,thebasalspacingwasstabilizedat1.8394nmandthelayeredstructureofthematerialswasnotdestroyed.Thermalanalysiswasconductedbyathermalgravimetryanddifferentialthermalanalysis(TG-DTA)instrument,itshowedthatAl-PILMlostphysicallyadsorbedwaterbelow230.6℃andwaterformedbydehydroxylationofthepillarsataround497.1℃,withapeakofthephasetransformationat903.0℃.
简介:AdditionofAl-5Ti-1Balloytomoltenaluminumalloyscanrefineα-Algrainseffectivelyandtherebyimprovetheirstrengthandtoughness.TiAl3andTiB2inAl-5Ti-1Balloyarethemainsecondary-phaseparticlesforrefinement,whiletheunderstandingontheeffectoftheirsizesonα-Algrainrefinementcontinuestobefragmented.Therefore,Al-5Ti-1Balloyswithvarioussizesandmorphologiesofthesecondary-phaseparticleswerepreparedbyequalchannelangularpressing(ECAP).Evolutionofthesecondary-phaseparticlesduringECAPprocessandtheirimpactonα-AlgrainrefinementwerestudiedbyX-raydiffractionandscanningelectronmicroscope(SEM).ResultsshowthatduringtheECAPprocess,micro-cracksfirstlyappearedinsideTiAl3particlesandthengraduallyexpanded,whichresultedincontinuousrefinementofTiAl3particles.Inaddition,micro-distributionuniformityofTiB2particleswasimprovedduetotheimpingementofTiAl3particlestoTiB2clustersduringdeformation.ExcessivelylargesizesofTiAl3particleswouldreducethenumberofeffectiveheterogeneousnucleusandthusresultedinpoorgrainrefinementeffectiveness.Moreover,excessivelysmallTiAl3particleswouldreduceinhibitoryfactorsforgraingrowthQandweakengrainrefinementeffectiveness.Therefore,anoptimalsizerangeof18-22μmforTiAl3particleswassuggested.
简介:Al-3B中间合金是亚共晶Al-Si合金的高效细化剂之一。实验研究了Al-3B中间合金中未溶AlB2颗粒对Al-7Si合金晶粒细化的影响。结果表明,AlB2颗粒的数目和沉降对晶粒细化效果都有重要影响。在实验结果和理论分析基础上,提出了Al-3B中间合金对亚共晶Al-Si合金晶粒细化的新机制,认为通过共晶反应形成的"Al-AlB2"包覆结构是导致晶粒细化的直接原因,未溶的AlB2颗粒是α(Al)相的间接行核基底。
简介:BasedontheMiedemamodelandExtendedMiedematheory,theformationenergiesofdifferentsolutecomponentsinEr-XbinarysystemandAl-Er-Xternarysystemswerecalculated.TheresultsshowthatthevariationoferbiumcontenthaslittleinfluenceonthechancerateoftheformationAl-ErcompoundintheAl-Mg-Mn-Zr-Ersystem.ThecalculatedformationenergiesintheEr-XbinarysystemandAl-Er-XternarysystemsindicatethatAl3Erphasecantakepriorityofdepositing,Al-Er-Zrternarycompoundsmayalsofoundwhichagreeswiththeexperimentalresultsinreferences.TheconsistencyofcalculationandexperimentprovesthattheintermetalliccompoundsintheAl-Mg-Mn-Zr-ErsystemcanbepredicteddirectlybycalculatingtheformationenergiesofthereactionsinEr-XbinarysystemandAl-Er-XternarysystemswiththeMiedemamodelandExtendedMiedematheory.
简介:ThecorrelationbetweenphasestructuresandsurfaceacidityofAl2O3supportscalcinedatdifferenttemperaturesandthecatalyticperformanceofNi/Al2O3catalystsintheproductionofsyntheticnaturalgas(SNG)viaCOmethanationwassystematicallyinvestigated.Aseriesof10wt%NiO/Al2O3catalystswerepreparedbytheconventionalimpregnationmethod,andthephasestructuresandsurfaceacidityofAl2O3supportswereadjustedbycalciningthecommercialγ-Al2O3atdifferenttemperatures(600–1200C).COmethanationreactionwascarriedoutinthetemperaturerangeof300–600Catdifferentweighthourlyspacevelocities(WHSV=30000and120000mL·g-1h-1)andpressures(0.1and3.0MPa).ItwasfoundthathighcalcinationtemperaturenotonlyledtothegrowthinNiparticlesize,butalsoweakenedtheinteractionbetweenNinanoparticlesandAl2O3supportsduetotherapiddecreaseofthespecificsurfaceareaandacidityofAl2O3supports.Interestingly,NicatalystssupportedonAl2O3calcinedat1200C(Ni/Al2O3-1200)exhibitedthebestcatalyticactivityforCOmethanationunderdifferentreactionconditions.LifetimereactiontestsalsoindicatedthatNi/Al2O3-1200wasthemostactiveandstablecatalystcomparedwiththeotherthreecatalysts,whosesupportswerecalcinedatlowertemperatures(600,800and1000C).ThesefindingswouldthereforebehelpfultodevelopNi/Al2O3methanationcatalystforSNGproduction.