简介:Ablackphosphorus(BP)saturableabsorber(SA)solutionwithdifferentconcentrations(1.0and0.5mg/ml)isfabricatedwiththeliquid-phaseexfoliationmethod.ByusingtheBP-SA,acompactdiode-pumpedpassivelyQ-switchedNd:YV04laserisdemonstrated.OnereflectingBragggratingsisusedastheoutputcouplerformodeselection.ByinsertingthoseBP-SAsolutionsinthelasercavity,themaximumsinglelongitudemode,Q-switchedoutputpowersof126mWat692.5kHzand149mWat630.3kHzareachievedatthepumppowerof8.0W,correspondingtothepulsedurationsof144nsand196ns,respectively.Moreover,longitudinal-modecharacteristicsofQ-switchedoutputlaserindifferentopticalcavitylengthsbasedontwo-kindBP-SAsolutionconcentrationsareinvestigated.OurresultsshowthatBP-SAcouldalsobedevelopedasaneffectiveSAfortheQ-switched,singlelongitudinalmodepulselaser.
简介:归纳了从钛铁矿中分离铁和二氧化钛的方法,包括亚熔盐法、预氧化法、还原锈蚀法;其次,初步总结了目前国内外制备Fe3O4磁性纳米颗粒和TiO2纳米粒子的方法。最后,对Fe3O4/TiO2复合材料的制备方法包括溶胶-凝胶法、微乳液法、均匀沉淀法作了梳理。Fe3O4/TiO2复合纳米材料很好地解决了单独使用TiO2作为废水处理催化剂,在实际应用过程中易随水流失,难以回收利用的问题,具有一定的实用性。
简介:Nanostructuredmetaloxidesderivedfrommetalorganicframeworkshavebeenshowntobepromisingmaterialsforapplicationinhighenergydensitylithiumionbatteries.Inthiswork,porousnanostructuredZnCo2O4andCo3O4weresynthesizedbyafacileandcost-effectiveapproachviathecalcinationofMOF-74precursorsandtestedasanodematerialsforlithiumionbatteries.ComparedwithCo3O4,theelectrochemicalpropertiesoftheobtainedporousnanostructuredZnCo2O4exhibithigherspecificcapacity,moreexcellentcyclingstabilityandbetterratecapability.Itdemonstratesareversiblecapacityof1243.2mAh/gafter80cyclesat100mA/gandanexcellentrateperformancewithhighaveragedischargespecificcapacitiesof1586.8,994.6,759.6and509.2mAh/gat200,400,600and800mA/g,respectively.ThesatisfactoryelectrochemicalperformancessuggestthatthisporousnanostructuredZnCo2O4ispotentiallypromisingforapplicationasanefficientanodematerialforlithiumionbatteries.
简介:Wereportontheperformanceofacontinuous-waveNd:GdVO4laserin-banddiode-pumpedat912nmwithhighoutputpowerandexcellentbeamquality.Thelaserproducedanoutputpowerof19.8Wat1063nmwithanopticalefficiencyof59.3%andslopeefficiencyof62.7%.Thelaserthresholdwas2.04Woftheabsorbedpumppower,andthelaseroutputbeamqualitywas≤1.2inthehorizontalandverticaldirections.Thestrengthofthermallensingatfulloutputpower(33.4Wofabsorbedpower)wasmeasuredtobeanaverageof8.6diopters.Itisshownthatthermallensingisreducedbyafactorof2withrespecttotheNd:YVO4lasers,thusopeningawayforfurtheroutput-powerscaling.
简介:Bysimultaneouslyemployingbothanelectro-opticmodulatorandcarbonnanotubesaturableabsorber(CNT-SA)inadual-lossmodulator,asubnanosecondsinglemode-lockingpulseunderneathaQ-switchedenvelopewithhighpeakpowerwasgeneratedfromadoublyQ-switchedandmode-locked(QML)Nd:Lu0.15Y0.85VO4laserat1.06μmforthefirsttime,toourknowledge.CNTswithdifferentwallstructures—single-walledCNTs(SWCNTs),double-walledCNTs(DWCNTs),andmulti-walledCNTs(MWCNTs)—wereusedasSAsintheexperimenttoinvestigatethesinglemode-lockingpulsecharacteristics.Atpumppowerof10.72W,themaximumpeakpowerof1.312MWwasobtainedwiththeDWCNT.
简介:DirectC—HfunctionalizationofquinolineN-oxideswitharylboronicacidsisachievedusingKMnO_4asthesoleandefficientoxidativesystem.Thismethodprovidesanefficientprotocoltoconstructregioselectively2-arylquinolineN-oxidesviaradicalcross-couplingreactioninmoderatedtogoodyieldsundermildconditions.
简介:LiMn2O4andLiNixAlyMn2-x-yO4(x=0.50;y=0.05-0.50)powdershavebeensynthesizedviafacilesolgelmethodusingBehenicacidasactivecheiatingagent.Thesynthesizedsamplesaresubjectedtophysicalcharacterizationssuchasthermogravimetricanalysis(TG/DTA),X-raydiffraction(XRD),Fouriertransforminfraredspectroscopy(FT-IR),field-emissionscanningelectronmicroscopy(FESEM),transmissionelectronmicroscopy(TEM)andelectrochemicalstudiesviz.,galvanostaticcyclingproperties,electrochemicalimpedancespectroscopy(EIS)anddifferentialcapacitycurves(dQ/dE).FingerprintXRDpatternsofLiMn2O4andLiNixAlyMn2-x-yO4fortifythehighdegreeofcrystallinitywithbetterphasepurity.FESEMimagesoftheundopedpristinespinelillustrateuniformsphericalgrainssurfacemorphologywithanaverageparticlesizeof0.5μmwhileNidopedparticlesdepictthesphericalgrainsgrowth(50nm)withice-cubesurfacemorphology.TEMimagesofthespinelLiMn2O4showstheuniformsphericalmorphologywithparticlesizeof(100nm)whilelowlevelofAl-dopingspinel(LiNio.5Alo.05Mn1.45O4)displayingcloudyparticleswithagglomeratedparticlesof(50nm).TheLiMn2O4samplescalcinedat850℃deliverthedischargecapacityof130mAh/ginthefirstcyclecorrespondsto94%coiumbicefficiencywithcapacityfadeof1.5mAh/g/cycleovertheinvestigated10cycles.Amongallfourdopantcompositionsinvestigated,LiNi0.5Al0.05Mn1.45O4deliversthemaximumdischargecapacityof126mAh/gduringthefirstcycleandshowsthestablecyclingperformancewithlowcapacityfadeof1mAh/g/cycle(capacityretentionof92%)overtheinvestigated10cycles.ElectrochemicalimpedancestudiesofspinelLiMn2O4andLiNi0.5Al0.05Mn1.45O4depictthehighandlowrealpolarizationof1562and1100Ω.
简介:我们在Mn50Ni40SnSbx(x=1,2,3,和4)合金。所有准备样品在房间温度与空间组一起展出B2类型结构。Sb的替换增加原子价电子集中并且减少联合起来的房间体积。作为结果,当x增加,magnetostructural转变向更高的温度很快变。在在不同磁场变化下面的磁性的熵的变化在这转变附近被探索。等温的磁化曲线展出典型metamagnetic行为,显示magnetostructural转变能被一个磁场导致。悦耳的martensitic转变和磁性的熵变化建议那Mn50Ni40SnSbx合金是应用在的吸引人的候选人固态制冷。