简介：Graphene氧化物(去)由于它的唯一的性质和潜在的应用吸引了广泛的注意。这里，我们报导调查去是的nanosheets为毛状的气体的一个静止阶段色析法(GC)分离。GO列，由一条新一步舞涂层途径制作了，308的显示出的平均McReynolds常数，建议GC静止阶段的中等极的性质。GO静止阶段与好山峰形状为不同类型的analytes完成好分离，特别为结合Hanalytes，例如白酒和胺。不同保留行为变静止从常规静止阶段的阶段可以从它和analytes的多重相互作用发源，包含结合H，dipole–dipole，–叠并且散相互作用。而且，去列与相对标准差(RSD%)显示出好分离重制度不到0.24%(n ；= ；5)在analytes的保留时间。

简介：Sn(OH)4waspreparedbytheconventionalsolutionprecipitatemethod,followedbysupercriticalCO2drying.TheresultantSn(OH)4wasdividedintothreealiquotsandcalcinedat400,600and800°C,respectively,thusSnO2nanoparticleswithaveragecrystallitesizesof5,10and25nmwereobtained.Furthermore,threeSnO2thickfilmgassensors(denotedassensorsS-400,S-600andS-800)werefabricatedfromtheaboveSnO2nanoparticles.Theadhesionofsensingmaterialsonthesurfaceofaluminatubeisgood.ComparedtothesensorsS-600andS-800,sensorS-400showedamuchhighersensitivityto1000μL/Lethanol.Ontheotherhand,sensorS-800showedamuchlowerintrinsicresistanceandimprovedselectivitytoethanolthansensorsS-400andS-600.X-Raydiffraction(XRD),transmissionelectronmicroscopy(TEM)andselectiveareaelectrondiffraction(SAED)measurementswereusedtocharacterizetheSnO2nanoparticlescalcinedatdifferenttemperatures.Thedifferencesinthegassensingperformanceofthesesensorswereanalyzedonthebasisofscanningelectronmicroscopy(SEM).

简介：Basedonageneralclassificationandcharacteristiccomparisonoftheexistingmodels,anewmodelfornon-catalyticgas-solidreactionsisproposedandageneralformulationforthemodelintermsofthesolidconversion,X,ispresentedinthispaper.Themodel,referredtothegeneralizedmodel,isdemonstratedtobeapplicabletoanysolidreactantofgeneralstructurerangingfromhighlyporoustononporousmaterials.Itisshownthatthegeneralizedmodelincorporatesthegrainandporestructureforasolidpelletandcanbereducedtothegrainandrandomporemodelsasextremecases.

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简介：Thecellulosetris(4-methylbenzoate)hasbeensynthesisedbythecatalyticmethodandwassupportedatGasChromQ.Theabsorptioncapabilityofcellulosetris(4-methylbenzoate)usedasagaschromatographicstationaryphasewascharacterizedbychromatographicmethodandtheClausius-Clapeyronequation.However,n-alcohols(C1-C8)weresuccessfullyseparatedonthecolumnpackedwithGasChromQcoatedwithcellullosetris(4-methylbenzoate).

简介：IntroductionTheelectrochemicalreductionofO2wasinvestigatedwidelyduringthepasttwodecades.O2-canreactwithvariousorganiccompounds.O2-asanewsynthesisreagenthasbeenbeingexplored.

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简介：Theinfluencesofmagnesiumandferricionsintheirdifferentratiosontherateofgypsumcrystallizationwerestudiedundertheconditionssimilartothoseofwetflue-gasdesulfurization(WFGD).TheresultsshowthatadditionofbothMg2+andFe3+increasedinductiontimeanddecreasedthegrowthefficiencyupto50%comparedwiththebaseline(withoutimpurities)dependingontheconcentrationandthetypeofimpurity.TheeffectsofMg2+andFe3+onthesurfaceenergyandtherateofnucleationwereestimatedbyemployingtheclassicalnucleationtheory.Thesurfaceenergydecreasedby8%and14%withtheadditionof0.02mol/Lmagnesiumorferricions,respectively,comparedtothebaseline.Mg2+andFe3+madethegrowthrateofthe(020),(021)and(040)facesofgypsumcrystalamuchgreaterreduction,whichleadstotheformationofneedlecrystalscomparedtothebaselinewhichfavorstheformationofplateorflakes.Furthermore,anedgedetectionprogramwasdevelopedtoquantifytheeffectsofimpuritiesonthefiltrationrateofgypsumproduct.Theresultsshowthattheinhibitionefficiencyofthepresenceof0.02mol/LMg2+andFe3+onthefiltrationrateofgypsumcrystalrangesfrom22%to39%.

简介：Inthiswork,areliableandsensitivemethodfordetectingpolybrominateddiphenylethers(PBDEs)hasbeendevelopedbythecombinationofliquid–liquidextractionandgaschromatography–massspectrometry.PBDEswereextractedfromalargevolumeofwaterbyliquid–liquidextractionandpurifiedbysilicagelchromatography.Inordertoreducethedeviation,dibromobiphenylwasexploitedastheinternalstandardtominimizedifferencesamongtheinjections.Thequantificationwasperformedusinganexternalstandard.Goodlinearcorrelationcoefficients(>0.991)andawidelinearityrange(1.0–500.0ng/L)indicatedthesteadinessoftheproposedmethod.Moreover,thesatisfactoryrecovery(>75%)suggestedthatsuccessfuldeterminationofPBDEsinriverwaterhadbeenachieved.Furthermore,thedeductionbehaviorofPBDEsinriverwatercouldbeinferredaccordingtotheresults.

简介：Usingfourβ-cyclodextrinderivatives,2,6-di-O-benzyl-3-O-heptanonyl-β-CD,2,6-di-O-benzyl-3-O-octanonyl-β-CD,2,3-di-O-benzyl-6-O-heptanonyl-β-CD,and2,3-di-O-benzyl-6-O-octanonyl-β-CD,aschiralstationaryphasesofcapillarygaschromatography(CGC),theenantiomersofSharplessepoxideswerewellseparated.Theenantiomerexcessvalues(e.e.%)ofsomechiralSharplessepoxideswerealsodeterminedsuccessfullyusingtheseCDs.

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简介：Twocystine-bearing1,3-bridgedcalix[4]areneswereusedasthecoatingsofthequartzcrystalmicrobalance(QCM)withgoldelectrodes.Thetwocalix[4]arenederivativeswereself-assembledontothegoldelectrodesurfacebythecovalentattachmentbetweenthedi-sulfurandgold.Thecompoundofcystine-bearingbi-phenylalanine1,3-bridgedcalix[4]arene(CPC)withlongeralkylchainhadbetterself-assembledcapacityontothefreshsurfacesofgoldelectrodethanthatofcystine-bearing1,3-bridgedcalix[4]arene(CC)withcomparablyshorteralkylchain.ThemodifiedQCMsensorswereusedtorecognizethebutylamineisomersingas.TheresultsshowedthattheQCMcoatedwithbothcompoundshadpreferentialaffinityton-butylamine,theni-butylamine,t-butylamineintherangeoflowconcentrations,indicatingthatintherecognitionprocess,thesterichindranceeffectplayedanimportantrolewhenformingcomplexwithguestmolecules.Whentheconcentrationsoftheanalyteswereincreased,thepolarityandthemagnetismofthebutylaminebecamedeterminativefactors.Thereversibilitywasimprovedgreatlyandtheequilibriumtimewasmuchshorterontheself-assembledfilmthanonthefilmobtainedbydroppingcoating.