简介:ThispaperinvestigatesthesolidificationbehaviouroftheAg—Cueutecticalloymeltundercooledupto100K.ItisrevealedthatlamellareutecticsgrowinadendriticformintheAg-Cueutecticmeltwithundercoolingequaltoorgreaterthan76K.Asundercoolingincreases,theremeltedfractionoftheprimaryeutecticsduringrecalescencerises.Thesevereremeltingandthesubsequentripeningoftheprimaryeutecticdendritesleadtotheformationofanomalouseutectics.
简介:Mercaptopropyltrimethoxysilane(MPTS)bearingmercaptogroupswasusedtoformself-assemblymonolayers(SAMs)onglasssubstratesbysolutionextraction.SEM,XRDandrubbingtestanalysisillustratedthattheAgfilmontheSAMs-modifiedglasswasmoredurablethanthatonthecommonly-modifiedglassandthatthecrystallinityofAgfilmontheSAMs-modifiedglasswasidenticalwiththoseoftheAgfilmonthecommonly-modifiedglassandpureAg.
简介:ThispaperreportstheuseofAufilmstoimprovetheperformanceofthestackedsolidoxidefuelcell(SOFC)basedonthecharacterizationoftheinterfaceandtheadhesionbetweentheelectrodesoftheSOFCsandtheAgpaste.Thespecimensweremanufacturedtoperformtheexperimentasfollows.ASiO2waferwitha300mmnotchwasattachedtotheelectrodesofaSOFCbyaAgpasteandAufilm,whichweredepositedontheelectrodesbysputteringfor1minor5mindepositiontimeandannealedat300Cfor1h.Thefour-pointbendingtestwasperformed,whichresultedintheformationofanextendedcrackatthetiponthewafernotch,andthecrackpropagationwasobservedusingastereomicroscopeequippedwithacharge-coupleddevice(CCD).Consequently,theinterfacialadhesionenergyandtheeffectoftheAufilmbetweentheeachelectrodeandtheAgpastecanbeevaluated.Onthecathode,theinterfacialadhesionenergywithoutAufilmwas2.59J/m2(uppervalue)andtheadhesionenergyincreasedto11.59J/m2(uppervalue)and15.89J/m2(lowervalue)withtheAufilm.Ontheanode,theinterfacialadhesionenergywithoutAufilmwas1.74J/m2(uppervalue),whichincreasedto11.07J/m2(uppervalue)and14.74J/m2(lowervalue)withtheAufilm.Inaddition,theinterfaceareaswereanalyzedbyscanningelectronmicroscopy(SEM)andenergydispersivespectroscopy(EDS)toestimatetheinterfacedelamination.
简介:摘要SCC6-5000F型余热锅炉补燃系统简介,并就一次典型的余热锅炉补燃系统运行中,出现的因热值到零导致补燃负荷反馈到零的原因进行了分析,简要分析了补燃异常的主要因素,并从运行操作和设计逻辑等方面提出了相应的改进方案,保证机组运行的安全性和稳定性。
简介:Itisawellknownfactthatmagnaticcryoto-explosion,asaspeeialformofmagmatismunderthenear-surfacecondition,hasacloseconncctionwithcdogcnicmctaldcposits,particularlywiththoseofporphyrytyPe,suchaSporphyryCu-Mo,Pb-Zn,W-SnandUdcposits’However,onlyinrcccntyearsbavetheChineseoregeologistsandpetrologistsgivenin
简介:Afacilemethodforthesynthesisofsilver-silica(Ag-SiO2)Janusparticleswithfunctionalitiessuitablefortextileapplicationsisreported.SilicananoparticlespreparedbytheStobermethodwerefunctionalizedwithepoxy,amine,andthiolgroups,whichwereconfirmedbyFouriertransforminfraredanalysis.ThefunctionalizedsilicananoparticleswereusedtoproducePickeringemulsions,andtheexposedsurfacewasusedfortheattachmentofsilvernanoparticles(AgNPs)viathelow-temperaturechemicalreductionmethod.ThemorphologyandstructureoftheAg-SiO2Janusparticleswerecharacterizedbyscanningelectronmicroscopy,scanningtransmissionelectronmicroscopy,high-resolutiontransmissionelectronmicroscopy,energy-dispersiveX-rayanalysis,andUV-visspectroscopy.Becauseoftheirspecificfunctionalities,theseAg-SiO2Janusparticlesareproposedforapplicationsontextilesubstrates,astheycanovercomeseveraldrawbacksofdirectapplicationofAgNPsontextiles,suchasleaching,agglomeration,andinstabilityduringstorage.
简介:为Agnanoparticles的准备的一条完全绿的小径被建议,由使用酱油蛋白质孤立(SPI)作为在紫外照耀和H2O下面的stabilizer作为在整个准备的环境地良性的溶剂。传播电子显微镜学(TEM)和希腊语的第六个字母潜力描述结果显示Agnanoparticles与一条平均直径稳定、很好分散大约13nm,和SPI/Ag合成nanoparticles的X光检查衍射(XRD)分析证实了金属性的银的形成。紫外力的光谱证明Agnanoparticles分散答案由于Agnanoparticles的表面电浆子回声在大约430nm有最大的吸收度。红外线的光谱学证实SPI的多肽脊梁没在变化形式过程期间被劈开并且一些积极的氨基的组被氧化。SPI/Ag合成nanoparticles对二个代表性的细菌举办优秀抗菌剂活动,葡萄球菌aureus(克积极)并且escherichiacoli(克否定)面对SPI。
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:Anovelgraphene/Agnanoparticles(NPs)hybrid(preparedbyaphysicalmethod(PM))wasincorporatedintoelectrospunTiO2fiberstoimprovevisible-light-drivenphotocatalyticproperties.Theexperimentalstudyrevealedthatthegraphene/AgNPs(PM)hybridnotonlydecreasedthebandgapenergyofTiO2,butalsoenhanceditslightresponseinthevisibleregionduetothesurfaceplasmonresonance(SPR)effect.Inaddition,comparedwiththoseofTiO2fibersincorporatingthegraphene/AgNPshybrid(preparedbyachemicalmethod(CM)),TiO2-graphene/AgNPs(PM)fibersexhibitedahighersurfacephotocurrentdensityandsuperiorphotocatalyticperformance,i.e.,thevisible-light-drivenphotocatalyticactivitywasenhancedby2times.Themainreasonsincludealowersurfacedefectdensityofthegraphene/AgNPs(PM)hybrid,asmallerparticlesize(10nm)andahigherdispersityofAgNPs,whichpromotetherapidtransferofphotoexcitedchargecarriersandinhibittherecombinationofphotogeneratedelectronsandholes.Itisexpectedthatthiskindofternaryelectrospunfiberswillbeapromisingcandidateforapplicationsinwatersplitting,solarcells,CO2conversionandoptoelectronicdevices,etc.
简介:发展无铅焊接在包装工业的电子学作为关键问题之一出现了。Bi-Sn-Ag最容易溶解的合金被看作了之一无铅焊接能代替有毒的Pb-Sn的材料最容易溶解没有增加焊接温度,焊接。我们调查了温度的效果Bi-Sn-Ag的机械、电、热的性质上的坡度和生长率第三的最容易溶解的合金。Bi-47wt%Sn-0.68wt%Ag合金方向性地在一个常数与不同温度坡度(G=2.33-5.66K/mm)向上被团结生长率(V=13.25m/s)并且与不同生长在一个常数的率(V=6.55-132.83m/s)在生长的温度坡度(G=2.33K/mm)仪器。微观结构(),microhardness(HV),张力的应力(),电的抵抗力(),并且热性质(H,Cp,Tm)在方向性地团结的样品上被测量。相关性,HV,,并且在G和V上被调查。根据试验性的结果,价值与增加G和V减少,但是HV,,并且价值与增加G和V增加。电的抵抗力的变化()因为在范围与温度扔样品300-400K也被测量由用标准dc四点的探查技术。熔化的热含量(H)和特定的热(C为一样的合金的p)借助于微分扫描也是坚定的从从最容易溶解的液体在转变期间加热踪迹到最容易溶解的固体的热量计(DSC)。