简介：采用水热法制备表面活性剂聚甲基丙烯酸-季戊四醇四-3-巯基丙酸酯(PTMP-PMAA)修饰的具有光热效应的纳米WO3-x粉末,通过X射线衍射(XRD)分析、透射电镜(TEM)观察、X射线光电子能谱(XPS)分析、傅里叶变换红外光谱(FT-IR)分析以及紫外-可见吸收光谱(UV-Vis谱)分析及光热性能测试等,研究所得纳米粉体材料的结构及其在不同浓度与pH值下的光热性能。结果表明,水热法制备的WO3-x粉末为球形的非整比结构的W17O47,粒径小于10nm。随WO3-x的pH值降低或质量浓度降低,粉末的紫外吸光度增加,光热效应提高。pH值为6.4、质量浓度为800μg/mL的WO3-x经光热转换后,可实现在5min内约19℃的温度上升。考虑到人体体温为37℃,肿瘤部位的pH值为6.0~6.5之间,此质量浓度下纳米WO3-x粉末可用于光热治疗并实现对肿瘤细胞的杀伤效果。

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简介：ThecatalyticactivitiesofMnOx-WO3/TiO2forselectivecatalyticreduction(SCR)ofNOwithNH3wereinvestigatedinawiderangeoftemperatureandreactioncondition.ItyieldedaNOxconversionof80.3%-99.6%andaN2productselectivityof100%-98.7%during100°Cto350°Catgashourlyspacevelocity(GHSV)=18900h-1.Inthepresenceof0.01%SO2and6%H2Oat120°C,theNOxconversioncanmaintain98.5%.At300°Candwith0.07%SO2inreactantstream,theNOxconversionstabilizedat99%ashighasthecommercialV-W/TiO2catalyst'slevel.Thesteady-statekineticsstudyshowsthatO2playedapromotingrole.Inthepresenceoflessthan1.5%O2,NOxconversioncanincreasesharplywiththeincreaseofO2concentration.ThereactionorderwaszerowithrespecttoNH3andfirstwithrespecttoNOwithexcessO2andH2O.Thekineticsactiveenergy(Ea)ofMn-W/TiO2wascalculatedtobe6.24kJ/molaccordingtothekineticexperimentatvarioustemperatures,muchlowerthanthoseofothercatalystsreportedintheliterature.Mn-W/TiO2isanexcellentcatalystforSCRofNOwithNH3bynow.

简介：Pt/WO3/CnanocompositeswithparallelWO3nanorodsweresynthesizedandappliedasthecathodecatalystforprotonexchangemembranefuelcells(PEMFCs).Electrochemicalresultsandsinglecelltestsshowthatanenhancedactivityfortheoxygenreductionreaction(ORR)isobtainedforthePt/WO3/CcatalystcomparedwithPt/C.ThehighercatalyticactivitymightbeascribedtotheimprovedPtdispersionwithsmallerparticlesizes.ThePt/WO3/Ccatalystalsoexhibitsagoodelectrochemicalstabilityunderpotentialcycling.Thus,thePt/WO3/CcatalystcanbeusedasapotentialPEMFCcathodecatalyst.

简介：Theshapeofnanostructurehasimportanteffectsontheirproperties,thereforeinthisstudy,wehavepreparedandcharacterizedthreedifferentmorphologiesofWO3nanostructuresi.e.nanorod,nanosphereandnanoplateforsurveyingshapeeffectontheirphotocatalyticpropertiestowarddegradationofRhodamineB(RhB)dye.ObtainedresultsshowthatnanoplateWO3incomparisonwithothershasthebestphotocatalyticactivity.AccordingtoSEM,andphotocatalyticdegradationresults,thereasonforthisbehavioristhesharpedgesandcornersofWO3nanoplates.Becauseoftheirlowcoordinationnumber,atomslocatedintheedgesandcornersoftheWO3nanoplateshavemoreactivity,adsorbmoreRhBandthereforegivemorephotocatalyticactivitytotheWO3nanoplates.UsingofdifferentscavengersshowedthathydroxylradicalsaremainlyresponsibleforphotocatalyticactivityofWO3nanoplatesandnanospheresbutforWO3nanorods,superoxideradicalsarethemainphotocatalyticdegradationagents.

简介：摘要WO3是一种过渡金属半导体，位于元素周期表第6周期VIB族，带隙约为2.6eV，有着非常丰富的物理化学性能，本文就WO3性质及应用作一个简要的综述，并展望其发展方向。

简介：在这研究，为海洋的申请目的，我们评估了在微观结构，机械加强和经由电极淀积生产的Zn-TiO2-WO3nanocomposite的腐蚀抵抗性质上装载的过程参数和粒子的效果。我们与与一个精力散分光计(版本)装备的一台扫描电子显微镜(SEM)描绘了合成涂层的词法性质。我们用一个Dura扫描坚硬测试者和一件必然发生的事情执行了机械检查UMT-2多功能的tribological测试者。我们在3.5%NaCl由线性极化评估了腐蚀性质。结果证明涂层展出了好稳定性，极大地装载的量的粒子提高了结构、词法的性质，坚硬行为和涂层的腐蚀抵抗。我们观察到钢上的这合金的降水被合成特征极大地影响。

简介：简要介绍了WO3粉体在电致变色、气敏性、光催化、光致变色等方面所表现出来的优异性能及其应用，并综述了WO3粉体的主要制备方法，包括固相法、气液法和液相法，总结了目前WO3粉体制备方法的发展现状、特点及不足。同时，分析了掺杂对WO3粉体性能的影响，并展望了未来的研究方向。

简介：Ti-dopedW03filmswerepreparedbythemid-frequencydual-targetmagnetronsputteringmethod.ThestructureandelectrochromicpropertiesoftheTi-dopedWO3filmswereanalysedbyX-Raydiffraction(XRD),Ramanspectroscopy,spectrophotometer,cyclicchronoam-perometryandatomicforcemicroscopy(AFM).Theresultsindicatethatthecrystallinitydecreaseafterthedopingoftitanium,thechannelsforioninjectionandextractionincrease,therespondingspeedwith5.1%titaniumdopedbecomesfaster,anditscirclelifeincreasesmorethanfourtimescomparedwiththeundopedWOafilm.Inthecolouredstate,theW-O-Wbondsdecrease,buttheW=Obondsincrease.SincetheW-O-WbondsbreakdownforLi~+ions'injectionandmoreW=Obondsform,itismoreconvenienttoinjectLi~+ionsintotheTi-dopedfilmthanundopedfilmbecausemoreW-O-Wbondsbreakdowninthecolouredstate.

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简介：讨论了方程ｘ（ｔ）＝－ｘ＾３（ｔ－１）－ｘ＾３（ｔ－２）周期解的结构。

简介：TheNd3+3.2%(atomfraction):KGd(WO4)2crystalwasgrownbyKyropoulosmethod.TheabsorptionspectrumandfluorescencespectrumofNd3+:KGWcrystalweremeasured.Theabsorptioncrosssectionsat808nm(0.6799×10-20cm2)werecalculated,andtheoutputwavelengthoffluorescenceis1064and1351nm.Thediode-pumpedlaserwasoperatedbothinthefree-runningandpassivelyQ-switchedoperatingmodes.Themaximumlaseroutput(1064nm)is326mWwith62.7%slopeefficiencywheninputenergyis900mW.ThebeamqualityfactorM2≈1.1.Thegreenlightof532nmisobtainedinfrequencydoublingoperation.ThelaserispassivelyQ-switchedbyusingCr4+:LuAGassaturableabsorber.Thepulsewidthis170nsatrepetitivefrequencyof15kHZ.

简介：TheNaGd（WO_4）_2：Eu~（3＋）phosphorswerepreparedbythemicroemulsionmediatedhydrothermalmethod.ThemorphologyandsizeofthesamplescouldbedependentonthepHintheinitialsolution.Thesephosphorsobtainedhadastrongabsorptionat395nmmatchingwiththepopularemissionofnear-UVLEDchips,andcouldemitintenseredlightat616nm.Thesmallellipsoid-likeparticlesorshortrodswereprovidedwithlargeparametersofoscillatorstrength？_2andasymmetryratio.Comparedtotheellipsoid-likephosphors,therod-likephosphorstookonstrongeremission,longerlifetimeandlargerquantumefficiency.Thisworkdemonstratedthattheone-dimensionNaGd（WO_4）_2：Eu~（3＋）phosphorsmightbeamorefavorabledevicethanzero-dimensiononesforphotoluminescence.

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简介：用沉淀法制得SiO2-WO3纳米粉体,按不同比例进行掺杂,对其进行了XRD物相分析,以TEM观察其形貌并测得平均粒径,结果表明,沉淀法可获得单斜晶系和三斜晶系共存的WO3纳米粉体,晶粒尺寸随SiO2掺杂量增加而减小,所得粉体粒径范围20-30nm,粒度均匀.

简介：ThepolycrystallinephaseWO3/g-C3N4wassynthesizedunderstirringusingtungstenicacid(H2WO4)andgraphiticcarbonnitride(g-C3N4)asrawmaterials.ThecatalystwascharacterizedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),energydispersivespectroscopy(EDS),theFouriertransforminfraredspectroscopy(FT-IR),andtheBrunauer-Emmett-Telleranalysis(BET).ThepolycrystallinephaseWO3/g-C3N4wasdeterminedbyXRDtechnique.TheoxidativedesulfurizationprocesswasinvestigatedusingWO3/g-C3N4asthecatalyst,30%hydrogenperoxide(H202)astheoxidant,and1-butyl-3-methylimidazoliumtetrafluoroborate([bmim]BF4)ionicliquids(ILs)astheextractant.Theoperatingconditions,includingH2WO4amount,ILdose,H2O2volume,temperature,catalystdosage,andtypesofsulfurcompounds,weresystematicallyresearched.Thedesulfurizationratecouldreach98.46%forremovingdibenzothiophene(DBT)fromthemodeloilunderoptimalreactionconditions.Inaddition,thecatalyticactivitywasslightlydecreasedafterfiverecyclesofcatalysts.Thereactionkineticsanalysisshowsthattheoxidativedesulfurizationsystemwasinaccordwiththefirst-orderreactionkineticsequation.Themechanismofoxidativedesulfurizationwasproposed.

简介：用正丁醇和柠檬酸为原料，WO3／MOO3／SiO2为催化剂催化合成柠檬酸三丁酯。通过考察醇与酸的物质的量比，反应温度和反应时间，催化剂用量和溶剂用量对酯化反应的影响。确定合成柠檬酸三丁酯的最佳反应条件为n（正丁醇）／n（柠檬酸）=4．5，催化剂用量为反应物柠檬酸质量的6％，反应温度130—140℃，反应时间3．5h，酯化率最高达98．5％，产率最高迭94．3％。WO3／MOO3／SiO2催化剂可重复使用，其催化活性基本不变。实验对合成的产品进行了红外光谱分析及折光率的测定，与文献值相符。

简介：OpticalabsorptionandemissionintensitiesofNd3+ioninKLu(WO4)2crystalwereinvestigated.BasedontheJudd-Offelttheory,wecalculatedthefollowingspectralparameters:phenomenologicalintensityparametersΩ2=5.567×10–20,Ω4=3.597×10–20,andΩ6=3.800×10–20cm2.Theradiativelifetimeoflevels4F3/2was182.58μs.Thefluorescencebranchingratioforthetransition4F3/2→4I11/2was46.98%.Inaddition,theradiativetransitionprobabilitiesAJ,J’,oscillatorstrengthsPJ,J’andthevaluesofinte...

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简介：ＥｌｅｃｔｒｏｃｒｙｓｔａｌｌｉｚａｔｉｏｎＭｅｃｈａｎｉｓｍｏｆＴｕｎｇｓｔｅｎｉｎＭｏｌｔｅｎＫＦ－Ｂ＿２Ｏ＿３－Ｋ＿２ＷＯ＿４ＷｅｎＺｈｅｎｈｕａｎａｎｄＬｉＧｕｏｘｕｎ文振环，李国勋（ＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｉｕｔｅｆｏｒＮｏ...