简介：通过优化测定条件,采用顶空气相色谱法测定PS和ABS制品中1,3-丁二烯残留量。样品在自动顶空进样器中,用N,N-二甲基乙酰胺在90℃下提取30min,气相色谱分析,外标法定量。在本试验条件下,1,3-丁二烯线性关系良好,相关系数为0.9991,检出限分别为0.3mg/kg,回收率为95.0%-103.0%,RSD值为2.29%~3.52%。

简介：

简介：Inpursuingexcellentsupercapacitorelectrodes,wedesignedaseriesofM0S2/C0S2compositesconsistingofflower-likedMoS2andoctahedron-shapedCoS2throughafacileone-stephydrothermalmethodandinvestigatedtheelectrochemicalperformanceofthesampleswithvarioushydrothermaltime.Duetothecouplingoftwometalspeciesandabigamountofwell-developedCoS2andMoS2,theresultsindicatedthattheMoS2/CoS2compositeselectrodesexhibitedthebestelectrochemicalperfor-mancewithalargespecificcapacitanceof490F/gat2mV/sor400F/gat10A/gamongallsamplesasthehydrothermaltimereached48h(MCS48).Furthermore,theretentionofMCS48is93.1%after10000cyclesat10A/g,whichmanifeststheexcellentcyclingstability.TheoutstandingelectrochemicalperformanceofMCS48indicatesthatitcouldbeaverypromisingandnovelenergystoragematerialforsupercapacitorsinthefuture.

简介：Aone-pot,solvent-thermalprocesswasusedtocreatetheultrafineZnFe2O4nanoparticlesphotocatalyst.Duringthesolvent-thermalprocess,theinsituself-formingNaClnotonlyservedasa"cage"toconfinetheiondiffusion,butalsoactedasamicroreactorfornanocrystallitegrowth.Anaverageparticlesizeof~10nmandahigh-specificsurfaceareaof~112.9m2/gwereobservedfortheultrafineZnFe2O4nanoparticlesOwingtothesynergisticeffectofultrafineparticlesize,thefullutilizationofthevisiblelightregionandhighconductionband(CB)position,ultrafineZnFe2O4photocatalystdisplayedanefficientphotocatalyticCO2reductionundervisiblelightillumination.Besides,theultrafineZnFe2O4photocatalystshowedhighproductionselectivityforCH3CHOandC2H5OHgenerationinaqueousCO2/NaHCO3solution.Thisworkmayprovideanewideaforthesynthesisofnewhigh-efficiencyphotocatalysts.

简介：近日,中科晶电忻州半导体产业基地砷化镓项目正式开业运营。忻州中科晶电信息材料有限公司布局的砷化镓晶体及晶片制造加工项目投资2.5亿元,以研发、生产、销售砷化镓衬底材料为主,建设有2英寸、3英寸、4英寸、6英寸砷化镓衬底材料大规模生产线,规划年产砷化镓单晶片折合4英寸200万片。

简介：

简介：

简介：

简介：

简介：

简介：

简介：

简介：FenanowirearraywithstrongshapeanisotropywasemployedasthesoftphaseinNd-Fe-Bbasednanocomposites.TheeffectsoftheFenanowiredistributiononmagneticpropertiesofthenanocompositeswereinvestigatedbymicromagneticsimulation.TheresultsindicatethattheshapeanisotropyofFewiresaddedinthesamedirectionastheuniaxialmagnetocrystallineanisotropyofthehardphasecannotincreasethecoercivityofthenanocomposite.Whenthenanowiresaredistributedperpendiculartotheeasyaxisofthehardphase,theshapeanisotropyofsoftphasecanretardthemomentsfromrotatingtothefullreverseddirection,leadingtoenhancedcoercivity.Inaddition,withincreasingthenanowirediameter,thecoercivityofthenanocompositedecreases,butthedipolarinteractionshowsdifferentrolesinmagneticreversalofnanocompositefordifferentdistributionsofnanowires.ThecurrentresultssuggestthatthecoercivityoftheNd2Fe14B/α-Fenanocompositecanbeenhancedbyintroducingthesoftmagneticnanowirearraywiththediameterlessthantheexchangelengthandwiththelongaxisalongthedirectionotherthantheeasyaxisofhardphase.

简介：Bismuth-basedSillen-Aurivilliuscompoundsarebeingexploredasefficientphotocatalystmaterialsforthedegradationoforganicpollutantsduetotheiruniquelayeredstructurethatfavourseffectiveseparationofelectron-holepairs.Inthiswork,wesynthesizedSillen-Aurivillius-relatedBi2YO4CIwiththebandgapof2.5eVbyasimplesolid-statereactionandsensitizedwithrhodiumnickel(RhNi)nanoparticles(NPs)toformtheRhNi/Bi2YO4CIheterostructure.PhotocatalyticactivitiesofBiOCI,Bi2YO4CIandtheRhNi/Bi2YO4CIheterostructurewereexaminedforthedegradationofrhodamine-6Gundervisible-lightillumination.ResultsdemonstratedthatthephotocatalyticdyedegradationefficiencyofRhNi/Bi2YO4CIheterostructuresishigherthanthoseofBiOCIandBi2YO4CI,attributedtothesynergisticmolecular-scalealloyingeffectofbimetallicRhNiNPs.Theplausiblemechanismforthedegradationofrhodamine-6Gandtheeffectiveelectron-holepairutilizationmechanismwerediscussed.

简介：Thecounterelectrode(CE)prominenceindye-sensitizedsolarcells(DSSCs)isundisputedwithresearchgearedtowardsreplacementofPtwithviablesubstituteswithexceptionalconductivityandcatalyticactivity.Herein,wereportthereplaceableCEwithbetterperformancethanthatofPt-basedelectrode.ThechemistrybetweenthegrapheneoxideandicetemplatesleadstocellularformationofreducedgrapheneoxidethatachievesgreaterconductivitytotheCE.Thesimultaneousgrowthofactiveedge-orientedMoS2ontheCEthroughCVDpossesseshighreflectivity.HighreflectiveMoS2trendstoincreasetheelectroactivitybyabsorbingmorephotonsfromthesourcetodyemolecules.Thus,thesynergisticeffectoftwomaterialswasfoundtoshowcasebetterphotovoltaicperformanceof7.6%against7.3%fortraditionalplatinumCE.

简介：Thisstudywasconductedtodiscusstheeffectofrollingstrainonmicrostructureandtensilepropertiesofdual-phaseMg-8Li-3Al-2Zn-0.5Y(wt%)alloy,whichwaspreparedbycasting,andthenhomogenizedandrolledat200℃.Therollingprocesswasconductedwith10%reductionperpassandfivedifferentaccumulatedstrains,varyingfrom10%to70%.Theresultsindicatethattheas-castandas-rolledMg-8Li-3Al-2Zn-0.5Yalloysarecomposedofα-Mg,β-Li,AlLiandAl2Yphases.Afterrollingprocess,anisotropicmicrostructurewasobserved.a-Mgphasegotelongatedinbothrollingdirectionandtransversedirectionwiththeadditionofrollingstrain.Consequently,thestrengthofthealloyinbothdirectionswasnotablyimprovedwhereastheelongationdeclined,mainlycausedbystrainhardeninganddispersionstrengthening.Thetensilepropertiesoftheas-rolledalloysintheRD,nomattertheYS,UTSortheelongation,arehigherthanthoseoftheTDduetotheirlargerdeformationstrainandsignificantanisotropyinthehcpα-Mgphase.Inaddition,thefractureandstrengtheningmechanismofthetestedalloyswerealsoinvestigatedsystematically.

简介：

简介：WithFe(NO3)39H2OandBi(NO3)35H2Oasrawmaterials,differentsillenite-typecompoundsandelementalbismuthwerepreparedbyafacileone-potsolvothermalmethodusingH2O,C2H5OH,(CH2OH)2andC3H8O3assolvents,respec-tively.Thestructure,morphology,elementalcompositionsandpropertiesofsampleswereexaminedbyXRD,SEM,TEM,ICP,XPS,N2adsorptionanddesorption,UV-visDRSandPL.ThephotocatalyticactivitiesofdifferentsampleswereevaluatedbythephotodegradationofRhBundervisible-lightirradiation(λ>400nm),andresultsshowthatBi36Fe2O57preparedusingC2H5OHasthesolventownstheoptimumperformance.Inordertoexplorethereactionmechanism,anadditionalexperimentwasdesignedtoinvestigatethemainactivespeciesduringthephotodegradationprocessviadissolvingdifferenttrappingagentsinthereactionsolutionbeforelightirradiation.TheresultsshowthatsuperoxideradicalanionsplayamajorroleinthissystemsincetheRhBdegradationwassignificantlysuppressedaftertheadditionofbenzoquinone.

简介：

简介：