简介:Anon-linearoptical(NLO)materialwassynthesizedbymeansofasimplemethod.Thismaterialcanbeappliedinelectro-optical(EO)devices,suchasEOswitchesandmodulators.TheDisperseRed1(DR1)wasdopedinpolymethyl-methacrylate-co-glycidylmethacrylate(PMMA-co-GMA)astheNLOactivechromophore.Thesynthesisprocessandmaterialstructurewereexpressed.Thethermalproperties,surfacemorphologyandopticalcharacteristicsofthematerialwereinvestigatedbymeansofdifferentialscanningcalorimetry(DSC),thermogravimetricanalysis(TGA),atomicforcemicroscopy(AFM),andm-linestechnique.Usingthereflectiontechnique,thevalueoftheelectro-opticalcoefficientγ33wasmeasuredas11pm/Vatawavelengthof1310nm.AnEOswitchwithnanosecondresponsebasedonthismaterialhasbeenfabricated.
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简介:[Hmim]3PW12O40wasdevelopedandusedintheacetalizationofcarbonylcompoundsinexcellentyields.Theionicliquid-heteropolyacidhybridcompoundandreactionmediumformedtemperature-dependentphase-separationsystemwiththeeaseofproductaswellascatalystseparation.Thecatalystwasrecycledmorethan10timeswithoutanyapparentlossofcatalyticactivity.
简介:由有固有的技巧此处,在房间膜上与高度选择的离子隧道和泵在液体从盐内容产生可观的bioelectricity的生物系统启发了一只充分不能生活的、单个杯子圆锥形的nanopores收获精力被表明。圆锥形的nanopores被显示出被取决于离子散开的方向的电解质集中坡度控制的否定地控告的玻璃里的离子当前的校正(ICR)。ICR的度与向前增加被提高集中差别。当集中坡度相对地被使用时,不平常的校正倒置被观察。有单个nanopore的最大的力量产量接近104 pW。这个灵巧、成本效率的收获精力的系统有潜力驱动干净精力的恢复种的微小的生物医学的设备或构造未来。
简介:FlavonolswereextractedfromAcanthopanaxSenticosusHarmsbySoxhletextraction(SE),atmosphericpressuremicrowave-assistedextraction(AMAE)andpressurizedmicrowave-assistedextraction(PMAE).Theinfluencesofexperimentalconditions,suchasconcentrationofethanolintheeluent,microwaveirradiationtime,etc.ontheextractionyieldwerestudied.Fourflavonols(hyperin,rutin,quercitrinandquercetin)intheextractsweredeterminedquantitativelybyHPLCmethod.TheexperimentalresultsdemonstratetheadvantagesofPMAEandAMAEoverthoseofconventionalSE,thatistheextractiontimeisdramaticallyreduced,andtheyieldsofflavonolsareeffectiveimproved.AlthoughtheyieldofflavonolsishigherandtheextractiontimeisshorterbyPMAEthanthoseofAMAE,flavonolsareeasytobedecomposedoveracertaintime.
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简介:Thesynthesisandcharacterizationoffournewsilicon-linkedlanthanocenecomplexeswithpendantphenylgroupsoncyclopentadienewerereported.Basedonthedataofelementalanalyses,MSandIR,thecomplexeswerepresumedtobeunsolvatedanddimericcomplexes[Me2Si(C5H3CMe2C6H5)2LnC1]2[Ln=Er(1),Gd(2),Sm(3),Dy(4)].InconjunctionwithAlEt3orsodiumhydrideastheco-catalyst,thesecomplexescouldefficientlycatalyzethepolymerizationofmethylmethacrylate(MMA).Whenthenanometricsodiumhydridewasusedasaco-catalyst,thecomplexeswerehighlyeffectiveforthepolymerizationofMMA.Atlowtemperatureandinshorttime,in[MeESi(C5H3CMe2C6H5)2LnC1]2/NaH(nanometric)system,thepolymerwasobtainedinmorethan80%yieldandthemolecularweightwasgreaterthan105.Theactivityreachedthatoforganolanthanidehydrideasasingle-componentcatalyst.In]MeESi(C5H3CMe2C6H5)2ErC1]2/Nail(nanometric)system,theeffectsofthemolarratioofMMA/catalystandcatalyst/co-catalyst,andthetemperatureonpolymerizationwerestudied.