简介：

简介：

简介：

简介：Alkalimetalhydroxideandhydridecompositesystemscontainbothprotic(HbondedwithO)andhydridichydrogen.Theinteractionofthesetwotypesofhydridesproduceshydrogen.Theenthalpyofdehydrogenationincreasedwiththeincreaseofatomicnumberofalkalimetals,i.e.,-23kJ/molH2forLiOH-LiH,55.34kJ/molH2forNaOH-NaHand222kJ/molH2forKOH-KH.Thesethermodynamiccalculationresultswereconsistentwithourexperimentalresults.H2wasreleasedfromLiOH-LiHsystemduringballmilling.ThedehydrogenationtemperatureofNaOH-NaHsystemwasabout150℃;whereasKOHandKHdidnotinteractwitheachotherduringtheheatingprocess.Instead,KHdecomposedbyitself.Inthesethreesystems,NaOH-NaHwastheonlyreversiblehydrogenstoragesystem,theenthalpyofdehydrogenationwasabout55.65kJ/molH2,andthecorrespondingentropywasca.101.23J/(molH2K),sothetemperatureforreleasing1.0barH2wasashighas518℃,showingunfavorablethermodynamicproperties.TheactivationenergyforhydrogendesorptionofNaOH-NaHwasfoundtobe57.87kJ/mol,showinggoodkineticproperties.

简介：在自然，微生物涉及岩石捱过，在从矿物质的金属的动员，并且在金属降水和免职。这些微生物原则和过程能被改编对待微粒固体浪费。特别从金属珍视获得的稳固的矿物质(沥滤的称为的简历)的金属的微生物增溶是在采矿工业的一种著名技术。我们这里集中于非采矿矿物质浪费为包含金属的稳固的浪费的处理表明基于采矿的技术的适用性。从微粒苍蝇灰的在案例研究介绍的、微生物引起的金属动员(从市政的稳固的浪费焚化发源)而铅，铬，和镍被2，11和32%分别地动员，由Acidithiobacilli导致了>80%的镉，铜，和锌动员。另外，形成HCN细菌的潜力(Chromobacteriumviolaceum，Pseudomonasfluorescens)当面对稳固的材料成长时，被调查动员金属(例如，包含铜的矿石，电子碎片，花的汽车催化变换器)。C。violaceum从有细密纹理的镍粉末作为tetracyanonickelate动员镍被发现有能力。黄金是微生物引起地是的solubilized从电子废物的dicyanoaurate。另外，氰化物建筑群铜在切碎的打印电路板碎片的生物处理期间被检测。水溶性的铜和铂氰化物也在花的汽车的处理期间被检测催化变换器。

简介：

简介：

简介：Metal-organicframeworks(MOFs)haveattractedmuchattentionasadsorbentsfortheseparationofCO2fromfluegasornaturalgas.Here,atypicalmetal-organicframeworkHKUST-1(alsonamedCu-BTCorMOF-199)waschemicallyreducedbydopingitwithalkalimetals(Li,NaandK)andtheywerefurtherusedtoinvestigatetheirCO2adsorptioncapacities.Thestructuralinformation,surfacechemistryandthermalbehaviorofthepreparedadsorbentsampleswerecharacterizedbyX-raypowderdiffraction(XRD),thermo-gravimetricanalysis(TGA)andnitrogenadsorption-desorptionisothermanalysis.TheresultsshowedthattheCO2storagecapacityofHKUST-1dopedwithmoderatequantitiesofLi+,Na+andK+,individually,wasgreaterthanthatofunmodifiedHKUST-1.ThehighestCO2adsorptionuptakeof8.64mmol/gwasobtainedwith1K-HKUST-1,anditwasca.11%increaseinadsorptioncapacityat298Kand18barascomparedwithHKUST-1.Moreover,adsorptiontestsshowedthatHKUST-1and1K-HKUST-1displayedmuchhigheradsorptioncapacitiesofCO2thanthoseofN2.Finally,theadsorption/desorptioncycleexperimentrevealedthattheadsorptionperformanceof1K-HKUST-1wasfairlystable,withoutobviousdeteriorationintheadsorptioncapacityofCO2after10cycles.

简介：Polymer/metalcompositesegmentalJanusnanoparticles(NPs)aresynthesizedbysequentialgrowthagainstpoly(4-vinylpyridine)(P4VP)crosslinkedcP4VP-PSJanusNPs.AJanusclusterofpoly(4-vinylpyridine)-block-polystyrene(P4VPb-PS)diblockcopolymerisself-organizedafterabsorptionontoasilicapatchysphereviahydrogenbonding.SelectivecrosslinkingofP4VPleadstotheformationofrobustcP4VP-PSJanusNPs.WithinthecP4VPdomain,functionalspeciessuchasmetalsarepreferentiallygrownbyinsitureduction.Otherthiol-cappedpolymers,forexample,thiol-cappedpoly(Nisopropylacrylamide)(PNIPAM-SH),canbeconjugatedontotheoppositesidetoformpolymer/metaltriplesegmentalJanusNPs.ThehyperthermiaeffectofAuNPofPNIPAM-Au@cP4VP-PSbynearinfrared(NIR)irradiationcantriggerafasttransitionfromamphiphilictohydrophobicoftheJanusNPsatlowsurroundingtemperature.De-stabilizationoftheemulsionisNIRtriggeredalthoughthesystemtemperatureisbelowLCST(~32°C).

简介：Thecarbynecompound[Br（CO）2（Py）2Mo（≡CC6H5）]（Py=pyridine）（1a）reactswithCo2（CO）8,Fe2（CO）9andMn2（CO）10togivetetrahedraltri-metalclustercompoundsCo2Mo（μ3-CC6H5）Br（CO）8（Py）2（2）,Fe2Mo（μ3-CC6H5）Br（CO）9（Py）2（3）andMn2Mo（μ3-CC6H5）Br（CO）10（Py）2（4）respectively.Tri-metalclustercompoundCo2Mo（μ3-CC6H5）Br（CO）8-（bipy）（bipy=α,α’dipyridyl）（5）ispreparedinasimilarreactionsequencefrom[Br（CO）2（bipy）Mo（≡CC6H5）]（1b）andCo2（CO）8.IR,1Hand13CNMRspectraldataofthesecompoundsarereportedanddiscussed.Thecrystalstructureofcompound（5）hasbeendeterminedbyX-raydiffraction.

简介：

简介：Millimeterandterahertzwavephotodetectorshaveawiderangeofapplications.However,thestate-of-the-arttechniqueslagfarbehindtheurgentdemandduetothestructureandperformancelimitations.Here,wereportsensitiveanddirectmillimeterandterahertzwavephotodetectionincompactInGaAs-basedsubwavelengthohmicmetal–semiconductor–metalstructures.Thephotoresponseoriginatesfromunidirectionaltransportationofnonequilibriumelectronsinducedbysurfaceplasmonpolaritonsunderirradiation.ThedetectedquantumenergiesofelectromagneticwavesarefarbelowthebandgapofInGaAs,offering,tothebestofourknowledge,anoveldirectphotoelectricconversionpathwayforInGaAsbeyonditsbandgaplimit.Theachievedroomtemperaturerisetimeandnoiseequivalentpowerofthedetectorare45μsand20pW·Hz^-1∕2,respectively,atthe0.0375THz(8mm)wave.Thedetectedwavelengthistunablebymountingdifferentcouplingantennas.Roomtemperatureterahertzimagingofmacroscopicsamplesataround0.166THzisalsodemonstrated.Thisworkopensanavenueforsensitiveandlarge-areauncooledmillimeterandterahertzfocalplanararrays.

简介：Wesuggestalowcross-talkplasmoniccross-connectorbasedonametal/insulator/metalcavityandwaveguides.Weseparatelyinvestigatetheisolatedcavitymode,thewaveguidemode,andthecombinationofcavityandwaveguidemodesusingafinite-differenttime-domainmethod.Duetoresonanttunnelingandthecutofffrequencyoftheoddwaveguidemode,ourproposedstructureachievesahighthroughputtransmissionratioandeliminatescross-talk.Furthermore,theproposedstructurehasabroadbandtunabilityof587nm,whichcanbeachievedbymodulatingthecavityairgapthickness.Thisstructureenablestheminiaturizationofphotonicintegratedcircuitsandsensingapplications.

简介：Metal-semiconductor-metalphotodetectorsonsemi-insulatingGaAswithinterdigitalelectrodesshowedsignificantenhancementinthespectralresponseinthenear-infraredregionastheelectrodespacingisreduced.Thephotocurrentforthedevicewith5μminterdigitalspacingisfiveordersofmagnitudehigherthanthedarkcurrent,andtheroomtemperaturedetectivityisontheorderof2.4×1012cmHz1∕2W-1at5Vbias.Furthermore,thespectralresponseofthisdevicepossessesstrongdependenceonthepolarizationofincidentlightshowingpotentialplasmoniceffectswithonlymicroscaledimensions.Theseexperimentaldatawereanalyzedusingopticalsimulationtoconfirmtheresponseofthedevices.

简介：

简介：Interactionsofpolyvinylpyrrolidone(PVP)withmetalchlorides(MgCl2,CaCl2,KC1andBaC12)havebeeninvestigatedbyviscometricandspectrophotometrictechniquesinaqueoussolutions.Intrinsicviscosity[η]of(PVP)hasshownadiscontinuitywithvaryingconcentrationofmetalchlorides.ThedecreasingorderofeffectivenessofcationisK1+＞Ca2+＞Mg2+＞Ba2+forpoly(vinylpyrrolidone)solution.ChangesintheabsorptionspectraofthecosoluteswereobservedinthepresenceofPVPinthelowerlimitoftheUV-visibleregioni.e.200-210nm.ThesechangeswereattributedtointeractionofPVPmoleculeswiththecosolutemolecules.Astheconcentrationofthecosoluteincreased,aredshiftinthepeakswasobserved,indicatinganincreaseininteractionbetweenPVPandcosolutes.

简介：Infusionreactordesign,firstwallisonekindofplasma-facingcomponents(PFCs),whichwillbeirradiatedbyhighenergyneutronsandotherparticle,aswellasworkunderhighplasmaheatflux.Theyshouldbeconsideredcarefully.Manyexperimentsand

简介：TheinteractionsbetweenmetalionssuchasZn2+,Pb2+,Mn2+,Hg2+,Cd2+,Ni2+andchitosanhavebeeninvestigatedusingthemodelclustermodelmethodanddensityfunctionalmethod.FulloptimizationandfrequencyanalysisofallclustermodelshavebeenperformedemployingB3LYPhybridmethodat3-21Gbasissetlevelexceptmetalionswhichwereinvokedtouseeffectivecorepotential(ECP)method.Theenergychanges,andthemainstructuralparametershavebeenobtainedduringthetheoreticalstudyoftheadsorptionofmetalionsonthechitosan.Thecalculationsshowedthatthecoordinationmodesofmetalionswithchitosanmodelsweredifferent,thegeometriesofMn2+,Zn2+,Cd2+,Hg2+,Pb2+ionscoordinatedwithtwonitrogenatomsandtwooxygenatomsweredistortedtetrahedral,whilethesquareplanarstructureofNi2+coordinatedtwonitrogenatomsandtwooxygenatomswasobserved.Theheatofreactionbetweensixmetalionsandchitosanmodelsshowedtheorder:Mn2+＞Ni2+＞Zn2+＞Pb2+＞Hg2+＞Cd2+,thissuggestedthatthecoordinationstrengthofMn2+＞Ni2+＞Zn2+＞Pb2+＞Hg2+＞Cd2+.

简介：

简介：在一台半导体设备构造一根相连的金属线的原子被电子流动在高密度搬运。这现象被称为electromigration，它可以引起线失败。以便描绘electromigration失败，比较研究被执行，一些典型现象为薄、大的结构由破裂力学对待。薄结构的一个例子，被破裂力学对待，是硅石为通讯系统的光纤维。在由electromigration的一根金属线的损坏生长在光纤维使遭到了到静态的疲劳的硅石与裂缝生长比较被描绘。另外，简短比较在大结构在electromigration失败和一些破裂现象之间被做。