简介:TheannealingbehaviorofAgnanoparticlesinsilicawithandwithoutdefectswasinvestigatedinthisstudy.SilicasampleswithandwithoutArionpre-irradiationwereimplantedwithAgionsandthenannealedattemperaturefrom300to850℃.UV-VISspectroscopyandTEMwereusedtocharacterizetheopticalabsorbancepropertyandsizedistributionofAgnanoparticles,respectively.OpticalabsorbanceresultsshowthattheabsorbanceintensityofSPR(SurfacePlasmonResonance,SPR)peakfromAgnanoparticlesinthesamplewithpre-irradiationisstrongerthaninthesamplewithoutpre-irradiation,whichindicatesthatthedefectsproducedbypre-irradiationpromptthenucleationofAgnanoparticles.Duringannealing,theSPRpeakshiftstoshortwavelengthdirection,asshowninFig.1.
简介:Inordertodeepentheunderstandingoftherelationshipbetweenfundamentalproperties(including:microstructureandcomposition)andphotocatalyticperformance,fourbismuthatecompounds,including:LiBiO3,NaBiO3,KBiO3,andAgBiO3,areregardedasresearchexamplesinthepresentwork,becausetheyhaveparticularcrystalstructuresandsimilarcompositions.Usingdensityfunctionaltheorycalculations,theirstructural,electronic,andopticalpropertiesareinvestigatedandcomparedsystematically.Firstofall,thecalculatedresultsofcrystalstructuresandopticalpropertiesareinagreementwithavailablepublishedexperimentaldata.Basedonthecalculatedresults,itisfoundthatthetunneledorlayeredmicro-structuralpropertiesleadtothestrongerinteractionbetweenbismuthandoxygen,andtheweakerinteractionbetweenalkaline-earthmetaland[BiO6]octahedron,resultinginthefeatureofmulti-bandgapsinthecasesofLiBiO3,NaBiO3,andKBiO3.ThisconclusionissupportedbythecaseofAgBiO3,inwhichthefeatureofmulti-bandgapsdisappears,duetothestrongerinteractionbetweenthenoblemetaland[BiO6]octahedron.Thesepropertieshavesignificantadvantagesinthephotocatalyticperformance:absorbinglowenergyphotons,rapidlytransferringenergycarriers.Furthermore,thefeaturesofelectronicstructuresofbismuthatecompoundsarewellreflectedbytheabsorptionspectra,whichcouldbeconfirmedbyexperimentalmeasurementsinpractice.Combinedwiththecalculatedresults,itcouldbeconsideredthatthecrystalstructuresandcompositionsofthephotocatalystdeterminetheelectronicstructuresandopticalproperties,andsubsequentlydeterminethecorrespondingphotocatalyticperformance.Thus,anovelBi-basedphotocatalystdrivenbyvisible-lightcouldbedesignedbyutilizingspecificcompositionstoformfavorableelectronicstructuresorspecificmicro-structurestoformabeneficialchannelforenergycarriers.
简介:AseriesofnovelAgCl/Ag2CO3heterostructuredphotocatalystswithdifferentAgClcontents(5wt%,10wt%,20wt%,and30wt%)werepreparedbyfacilecoprecipitationmethodatroomtemperature.TheresultingproductswerecharacterizedbypowderX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),X-rayphotoelectronspectroscopy(XPS),andultraviolet–visiblediffusereflectancespectroscopy(UV–VisDRS),respectively.Thephotocatalyticactivityofthesampleswasevaluatedbyphotocatalyticdegradationofmethylorange(MO)underUVlightirradiation.WiththeoptimalAgClcontentof20wt%,theAgCl/Ag2CO3compositeexhibitsthegreatestenhancementinphotocatalyticdegradationefficiency.Itsfirst-orderreactionrateconstant(0.67h-1)is5.2timesfasterthanthatofAg2CO3(0.13h-1),and16.8timesfasterthanthatofAgCl(0.04h-1).TheformationofAgCl/Ag2CO3heterostructurecouldeffectivelysuppresstherecombinationofthephoto-generatedelectronandhole,resultinginanincreaseinphotocatalyticactivity.
简介:Cracksmayeasilyoccurinthefusionweldbetweenvanadiumalloysandstainlesssteelduetothebrittleintermetallicsandweldingstress.Thehighvacuumelectronbeambraze-weldinghasbeensuccessfullyusedtojoinvanadiumalloy(V-5Cr-5Ti)tostainlesssteel(HR-2)withelectroplatedCuandAgcoating.Toinvestigatetheeffectsofelectroplatedcoatingontheweldability,thejointappearance,themicrostructureandthemechanicalpropertiesofthejointshavebeenthoroughlyanalyzed.Theresultsshowthatthejointsurfaceconfigurationwasgoodandrootreinforcementwasfullandsmooth.Areactionzone(RZ)wasgainedontheinterfacebetweentheVSCrSTialloyandHR-2stainlesssteelbasemetals.Thewidthofreactionzoneatthetopofthejointwasupto0.65mm,widerthanthatinthebottomofthejoint(0.46mm).Thereactionzoneconsistedofconsiderablysmallerdendriticstructureswithanaveragegrainsizeoflessthan10μm.ElementAgandCualmostenrichedtheinterfacebetweenV-5Cr-5TialloysubstrateandRZ,servingasaphysicalbarrierwhichdecreasesoravoidstheformationofintermetallics.Themaximumtensilestrengthofvanadiumalloy/stainlesssteeldissimilaralloyjointwasmorethan300MPa.Thejointwasdefectsfree.
简介:为了满足透明导电薄膜轻便、可折叠、高分辨率及快速响应的需求,在AZO单层透明导电薄膜研究基础上,尝试在柔性PET衬底上制备AZO/Ag/AZO三层透明导电薄膜。先利用光学薄膜设计软件对膜系进行设计优化,再参照此优化值制备研究不同AZO、Ag层对AZO/Ag/AZO薄膜光电性能的影响。通过合理的实验设计与对比,发现在柔性PET衬底上制备的三层AZO薄膜与在硬质衬底上制备的薄膜光电性能相当,且当三层AZO/Ag/AZO薄膜中AZO层厚度在40-45nm,Ag层厚度8nm时,在可见光波段的透过率高达到92%,电阻率低至4.0×10-(-5)Ω·cm,透明导电薄膜的品质因子最高为12.6×10-(-2)Ω-(-1)。得到的AZO/Ag/AZO三层透明导电薄膜具有与常见的ITO薄膜相比拟的性能。
简介:作为市场参与主体的顾客在公司治理中的作用与表达机制,一直未能得到应有的重视和深入的研究。将有议价能力的顾客引入公司治理体系中,探讨产品市场势力、公司治理机制与公司绩效的关系是值得深入研究的领域。以深圳证券市场2009-2014年创业板上市公司为研究样本,检验产品市场势力、公司治理和公司绩效之间的关系,实证检验结果表明:合理的公司治理机制安排能够提高公司的绩效,而产品市场势力对公司治理机制产生了互补作用,体现在股权结构、董事会监督及股权激励方面。这意味着,要提高公司绩效、实现股东利益最大化,有必要进一步完善上市公司的治理机制。同时,发挥产品市场势力的治理作用,通过与内部公司治理机制的配合,更有效地提高公司绩效。
简介:摘要随着经济的发展,人们生活质量越来越高,人们对建筑功能性、舒适性提出了更高要求。暖通空调系统是现代建筑中不可缺少的重要基础设施,既能够用来采暖、通风,还能够用来调节空气,改善室内环境,提升建筑舒适性。但随着暖通空调应用范围的扩大,暖通空调能耗问题日益突出,一些建筑中暖通空调能耗占到了建筑总能耗百分之四十到五十,而在西方发达国家仅占百分之十五。虽然我国地大物博,但资源存量严重不足,属于能源短缺国。在我国能源消耗中建筑能耗占据了很大比例,且呈现上升趋势,这其中暖通空调能耗最为突出。高能耗不仅会带来能耗问题,更会带来污染问题,进行暖通空调优化势控制在必行。本文将针对暖通空调优化控制技术的应用展开研究。
简介:Afacilestep-by-stepapproachisdevelopedforsynthesizingthehigh-efficiencyandmagneticrecyclableFe_3O_4@SiO_2@Ag@Nitrepang-likenanocomposites.ThismethodinvolvescoatingFe_2O_3nanorodswithauniformsilicalayer,reductionin10%H_2/AratmospheretotransformtheFe_2O_3intomagneticFe_3O_4,andfinallydepositingAg@Nicore-shellnanoparticlesontheL-lysinemodifiedsurfaceofFe_3O_4@SiO_2nanorods.Thefabricatednanocompositesarefurthercharacterizedbyx-raydiffraction,transmissionelectronmicroscopy,scanningelectronmicroscope,Fouriertransforminfraredspectroscopy,andinductivelycoupledplasmamassspectroscopy.TheFe_3O_4@SiO_2@Ag@Nitrepang-likenanocompositesexhibitremarkablyhighercatalyticefficiencythanmonometallicFe_3O_4@SiO_2@AgnanocompositestowardthedegradationofRhodamineB(RhB)atroomtemperature,andmaintainsuperiorcatalyticactivityevenaftersixcycles.Inaddition,thesesamplescouldbeeasilyseparatedfromthecatalyticsystembyanexternalmagnetandreused,whichshowsgreatpotentialapplicationsintreatingwastewater.