简介:Anewtechniqueisdevelopedforquantitativedeterminationofrheniuminaqueousmediacontainingmolybdenum,ironandcopperions.Themethodseemseasierandmoreaccuratethanthetraditionalones.Itconsistsoftheformationofrheniumthiocyanatecomplex,whichisextractedwithchloroformatthepresenceofhydrochloricacid.Thiscomplexisahighlyvisiblelightabsorbentthatcaneasilybedetectedwiththeaidofaspectrophotometer.Themaximumabsorbance(λmax)observedforthiscomplexwasinthevisiblerangeof430~435nm.Theexperimentalresultsshowedthatinaconcentrationrangefrom0.5~8mg/L,theabsorbancebehavioroftherheniumthiocyanatecomplexisfollowedtotheBeer-Lambertlaw.
简介:在这研究,离氨酸被介绍进apatitewollastonite玻璃的表面陶器(AW-GC)走反应在二改进它的cytocompatibility过程。第一,离氨酸与N连接了--(aminoethyl)--由酰胺组有约束力的共有原子价的aminopropyltrimethoxysilane(A-1120)。第二,lysine-functionalizedA-1120通过包含一个共有原子价附件的silanization反应在AW-GC的表面上被扔。FTIR系列显示离氨酸成功地被使不能调动到AW-GC的表面上。表面的Bioactivity修改了AW-GC被模仿的身体液体(SBF)调查,并且在里面vitrocytocompatibility被coculturing与人的osteosarcoma房间MG63评估。当hydroxyapatite免职的模式被改变时,结果证明在修改材料上形成的hydroxyapatite层的过程类似于AW-GC。MG63细胞的生长证明与离氨酸修改AW-GC表面提高细胞粘附和增长。
简介:Theeffectofflyashandearlystrengthagentonresistanceofconcretetothecyclicsulfateenvironmentwasstudied.Concretespecimensmadewithordinaryportlandcementorordinaryportlandcementincorporatingflyashwiththereplacementof10%or20%,or1%earlystrengthagentandflyashwiththereplacementof20%,weremadeandsubjectedto250cyclesofexposuretothecyclicsulfateenvironment.Concretepropertiesincludinglossofmass,chlorideiondiffusioncoefficient,compressivestrengthandflexuralstrengthweremeasured.MicrostructureandchemicalcomponentofsamplesweredeterminedbymeansofX-raydiffraction,scanningelectronmicroscopyandenergydispersivespectroscopy.Theexperimentalresultsindicatedthateffectofflyashonthecyclicsulfateresistanceofconcreteswasmostlydependentontheamountofflyash.Earlystrengthagentimprovedperformancesofconcretewith20%flyashexposedtocyclicsulfateenvironment.
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简介:Thevolatilizationkineticsofantimonytrisulfideinsteamatmospherewasstudiedwiththermogravimetryattemperaturesfrom923to1123K.Atheoreticalmodelwasdevelopedtocalculatetheoverallrateconstantandthemasstransfercoefficientingasphases.Theexperimentalresultsshowthatthevolatilizationrateisenhancedwithincreasingtemperatureandsteamflowrate.Thevolatilizationrateismainlycontrolledbythemasstransportingasphases.Theapparentactivationenergyfortheprocessisfoundtobe59.93kJ/mol.ItisdemonstratedthatSb2S3isdominantlyoxidizedintoSb2O3andH2Sbywatervaporinthevolatilizationprocess.Someantimonymetalisformed.Thereactionmechanismisdiscussedinaccordancewithexperimentaldata.
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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:Inthepastfewdecades,manynovelnon-metaldopedZnOmaterialshavedevelopedhastyinterestduetotheiradaptablepropertiessuchaslowrecombinationrateandhighactivityunderthesolarlightexposure.Inthisarticle,wecompiledrecentresearchadvancesinnon-metal(S,N,C)dopedZnO,emphasizingontherelatedmechanismofcatalysisandtheeffectofnon-metalsonstructural,morphological,opticalandphotocatalyticcharacteristicsofZnO.ThisreviewwillenhancetheknowledgeabouttheadvancementinZnOandwillhelpinsynthesizingnewZnO-basedmaterialswithmodifiedstructuralandphotocatalyticproperties.
简介:采用热注入法成功制备出三元AgInS2和四元Ag—Zn—In—S量子点,物性测试得到AgInS2量子点的发射峰为701nm,Ag—Zn—In—S量子点的发射峰593nm,即Ag-Zn-In—S量子点的发射峰相对于AgInS2量子点发生了蓝移,AgInS2和Ag—Zn—In—S量子点都表现出了较长的荧光寿命,分别为169ns和162ns,结合生物组织光学窗口范围限制,相对Ag—Z—In—S,AgInS2量子点更适用于生物标记。
简介:德国Ⅵ系统公司宣布研制出第一个通过多模光纤数据传输速率达40吉比特/s(40Gbit/s)的单VCSEL(垂直腔面发射激光器)。2009年1月份在美国加州SanJose召开的光子学会议上,该公司刚介绍了其20吉比特/s的器件,目前又使它的量子点激光器的调制速率提高了1倍。该公司利用其VCSEL和PIN光探测组件实现了通过多模光纤的40吉比特/s连续传输,这是850hm(波长)光发射的刨记录器件,是用与20吉比特/sVCSEL相同的光刻掩模研制的,但对外延结构作了改进。这种器件设计利用GaAs量子阱中的InAs量子点,并嵌入到AlGaAs基体中。
简介:Overcasting是过去常生产铝(固体)的一种新有点不一样的加入技术结合的/magnesium(液体)在这研究的二金属的材料。为Al/Mg(A390/AM60)二金属的样品,接口微观结构是研究点,它直接影响机械性质。因此,发现一个方法改进接口微观结构具有重要重要性。这研究在二金属的样品的A390/AM60接口微观结构上在液体Mg合金和热处理在钙(Ca)的效果上集中了增加。严峻的结果证明与在AM60的Ca增加,由于二个可能的原因,接口微观结构和A390/AM60二金属的样品的shear力量能被改进。热处理能进一步由溶解-Mg17Al12进-Mg并且破坏Mg2Si层结构。