简介:通过表面压(π)-单分子面积(A)等温线研究了二茂铁亚胺环钯化合物的气-液界面行为。结果表明:升高亚相的温度、降低滴加成膜物质的浓度和挤压速度、挤压前停留一段时间均有利于亚相上形成致密、稳定的Langmuir膜。其原因可能是升高亚相温度能够增强亚相水分子和其表面成膜物质的流动性,降低挤压速度和挤压之前停留一段时间能够使聚集的成膜物质分散,从而有利于成膜物质在亚相表面形成致密、稳定的Langmuir膜。在优化的单层膜形成条件下,制备了二茂铁亚胺环钯化合物的Langmuir-Blodgett膜,其层数与紫外-可见光谱中的最大紫外吸收呈现良好的线性关系,表明此Langmuir-Blodgett膜具有良好的纵向均匀性和结构周期性,也进一步证实了亚相表面形成了致密、稳定的Langmuir膜。
简介:PolymerLBfilmscontainingphotofuntionalgroupswerepreparedbythecopolymerizationofN-dodecylacrylamide(DDA),whichhasanexcellentpropertytoformastablemonolayerandLBmultilayerswithphotofunctionalmonomers.Tris(2,2’-bipyridine)rutheniumcomplex,Ru(bpy)32+,oneofthemostwell-knownredox-activesensitizer,wasincorporatedintotheDDAcopolymer.ThephotogalvaniceffectbasedonthephotoinducedelectrontransferusingtherutheniumcomplexinthepolymerLBmonolayerwasdiscussed.
简介:PhotoelectrochemicalPropertiesofaFerroceneDerivativeandItsLangmuir-BlodgettFilmXiawensheng(夏文胜);YeXianzeng(叶宪曾);HuangChunhui(...
简介:采用化学方法制备直径约100μm的超大尺寸氧化石墨烯,利用Langmuir-Blodgett自组装法将其逐层沉积于基体表面,制备透明导电薄膜。经过高温还原后,平坦、紧密排列结构的石墨烯薄膜具有高导电性及透明度。在86%的透明度下,获得的表面电阻为605-/sq,此光电性质优于用化学气相沉积法在Ni表面生长的薄膜。该方法具有易操作、成本低、便于工业化大规模生产等优势。
简介:InordertoobtaincreditabledataanapplicablemethodtooptimizeparametersoftheLangmuirprobesandcircuitsinastationarylaboratorydeviceisinvestigatedandanexperimentalcriterionoftheprobedimensionisdeveloped.ToobtaintheelectrontemperatureanddensitytheElectronEnergyDistributionFunction(EEDF)approachwithlesscomputingtimeandmoreaccurateresultsisapplied,insteadoftheconventionalslopeapproach.Moreovertheinfluenceofthevesselwallmaterialsontheplasmadensityisdiscussedbriefly,indicatingthatthedielectricwallishelpfultoenhancingtheelectrondensity.
简介:大旋涡模拟(LES)被用来调查形成对照的动态特征砍骚乱(圣)和在表面的兰米尔循环(LC)混合了层(SML)。圣被在SML强迫的风通常导致。LC能被包括强迫的风,波浪和旋涡的角色的波浪水流相互作用驾驶。LES结果证明LC压制水平速度并且极大地修改顺风的速度侧面,但是增加垂直速度。LC的强壮的downwelling喷气加速并且增加向下作为与圣塞相比精力搬运垂直旋涡粘性KL的m比混合的圣斯特朗的由LC导致的大得多有二个地点。他们位于2s3s(司烧深度规模)并且SML的更低的层分别地。它的价值和位置随着时间周期性地变化。相反,最大的K圣导致的m位于SML的中间的深度。LC产生的狂暴的动能(TKE)由在TKE和Km是明显的。因此,LC的parameterization不能完全基于TKE。为深SML,在LC的大规模旋涡的传送对流起一个主要作用在向下,精力和LC的运输能导致更强壮的速度砍(SML底附近的S2)。另外,LC导致的大规模旋涡和S2总是正在变化,它需要充分在LC的parameterization被考虑。
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简介:ThisstudypresentstheLangmuirandFaradayprobemeasurementsconductedtodeterminetheplumecharacteristicsoftheBUSTLabmicrowaveelectrothermalthruster(MET).Thethruster,designedtooperateat2.45GHzfrequency,isrunwithhelium,argonandnitrogengasesasthepropellant.Forthemeasurements,thepropellantvolumeflowrateandthedeliveredmicrowavepowerlevelsarevaried.Experimentswithnitrogengasrevealedcertainoperationregimeswhereaveryluminousplumeisobserved.Withtheuseofin-house-builtLangmuirprobesandaFaradayprobewithguardring,thrusterplumeelectrontemperature,plasmadensityandioncurrentdensityvaluesaremeasured,andtheresultsarepresented.ThemeasurementsshowthatMETthrusterplumeeffectsonspacecraftwilllikelybesimilartothoseofthearcjetplume.Itisobservedthatthemeasuredplumeionfluxlevelsareverylowforthehighvolumeflowratesusedfortheoperationofthisthruster.
简介:Insituphotochromicprocessinthemonolayerofaphotochromicspiropyranderivativewithoutlongalkylchain,wasinvestigated.Thephotochromismattheair/waterinterfaceunderdiffernetsurfacepressureswasstudiedbysurfacepressure-areaisotherms,surfacepressure-timecurves,area-timecurvesandBrewsteranglemicroscopy.Bothformsofthecompoundwerefoundtoformmonolayersattheair/waterinterfacealthouhgitdoesnothavelongalkylchain.Alargeareaexpansioninthemonolayercorrespondingtoazreo^thorderreactionwasfoundattheinitialstageoftheUVlightirradiation.Aseriesofdynamicinvestigationsrevealedthatathighpressureafterphasetransitioninthemonolayer,thesurfacepressurechangesgreatlyumderalternativeirradiationofUVandvisiblelight.Anobviousmorphologicalchangeaccompanyingwiththephotochromismwasobservedinsitu.
简介:本文从弱湍动等离子体理论出发,由Vlasov方程导出了Maser效应作用机制下共振波的演化规律;并且讨论了尘埃等离子体电子束入射情况下,共振Langmuir波的增长率。研究结果表明,Maser效应比其它不稳定性(如本文中论及的束流不稳定性等)能更好的解释空间中的反常Langmuir辐射现象。