简介：Carbonnanotubes(CNTs)canbefluidizedintheformoffluidlikeagglomeratesmadeofmanythree-dimensionalsub-agglomerates,havingamulti-stageagglomerate(MSA)structureandcontaininglargeamountsoftwistingCNTsofmicrometermagnitude.

简介：一系列碳nanotubes/TiO2nanotubes(CNTs/TNTs)合成光催化剂被CNT的加入成功地在HNO3洗准备过程。分别地，这些光催化剂被XRD，N2物理吸附，UVvis弥漫的反射光谱学，TEM和拉曼光谱学描绘，他们的photocatalytic活动被把methy1橘子(瞬间)用作模型混合物测试。另外，合并的CNT的数量的效果，锻烧温度和在合成光催化剂的photocatalytic活动的催化剂的数量系统地被调查。结果证明CNTs/TNTs合成展览高得多的photocatalytic活动比TNT或CNT的独自一个。

简介：Surfaceeffectsonthepersistencelengthofquasi-one-dimensionalnanomaterialsareinvestigatedbyusingthetheoryofsurfaceelasticityandthecore–shellmodelofnanobeams.Asimpleandunifiedexpressionisprovidedtodeterminethepersistencelengthofnanowiresandnanotubeswithanyregularpolygonalcross-sections.Itisdemonstratedthatsurfaceeffectshaveadistinctinfluenceonthepersistencelengthwhenthecharacteristicsizesofmaterialsshrinktonanometers.Thisworkishelpfulnotonlyforunderstandingthesize-dependentbehaviorofnanomaterialsbutalsoforthedesignofdevicesbasedonnanotubesornanowires.

简介：磁铁矿(Fe3O4)nanotubes被减少综合赤铁矿准备(在5%H2+95%Ar空气的-Fe2O3)nanotubes，然后磁赤铁矿(-Fe2O3)nanotubes被重新氧化获得Fe3O4nanotubes。nanotube结构被不崩溃或在整个减少的高温度和重新氧化的过程的sintering。Fe3O4和-Fe2O3nanotubes的coercivities综合了与一样的阶段并且类似的尺寸比另外的nanostructures高两个都被发现分别地，是340.22Oe和342.23Oe。吸附的磷酸盐和nanotube结构为这高coercivity被认为负责。

简介：Analyticalsolutionsfortheelasticpropertiesofavarietyofbinarynanotubeswitharbitrarychiralityareobtainedthroughthestudyofsystematicmolecularmechanics.Thismolecularmechanicsmodelisfirstextendedtochiralbinarynanotubesbyintroducinganadditionaloutof-planeinversiontermintotheso-calledstick-spiralmodel,whichresultsfromthepolarbondsandthebucklingofbinarygraphiticcrystals.Theclosed-formexpressionsforthelongitudinalandcircumferentialYoung’smodulusandPoisson’sratioofchiralbinarynanotubesarederivedasfunctionsofthetubediameter.Theobtainedinversionforceconstantsarenegativeforalltypesofbinarynanotubes,andthepredictedtubestiffnessislowerthanthatbytheformerstick-spiralmodelwithoutconsiderationoftheinversionterm,reflectingthesofteningeffectofthebucklingontheelasticpropertiesofbinarynanotubes.Theobtainedpropertiesareshowntobecomparabletoavailabledensityfunctionaltheorycalculatedresultsandtobechiralityandsizesensitive.ThedevelopedmodelandexplicitsolutionsprovideasystematicunderstandingofthemechanicalperformanceofbinarynanotubesconsistingofIII–VandII–VIgroupelements.

简介：Analumina-supportedcobaltaerogelcatalystpreparedfromasol-gelandasupercriticaldryingmethodwasusedinthecatalyticdecompositionofmethane.Thephysical-chemicalpropertiesofthecatalystwerecharacterizedanditsactivityformethanedecompositionwasinvestigated.Theeffectsofcalcinationandreactiontemperaturesontheactivityofthecatalystandthemorphologyofthecarbonnanotubesproducedwerediscussed.ACoAl2O4spinelstructureformedinthecalcinedcatalyst.Thequantityofthenanotubesproducedinthereactionincreaseswiththeamountofcobaltinthereducedcatalyst.Ahigherreactiontemperatureleadstoahigherreactionrate,thoughfasterdeactivationofthecatalystoccurswiththechange.Thecarbonnanotubesgrownonthecatalysthavesmoothwallsanduniformdiameterdistribution.

简介：Ananalyticalmodelisdevelopedtostudythesurfaceeffectsonthevibrationbehaviorincludingthenaturalfrequencyandthecriticalflowvelocityoffluid-conveyingnanotubesembeddedinanelasticmedium.TheeffectsofsurfaceelasticityandresidualsurfacestressareaccountedthroughthesurfaceelasticitymodelandtheYoung-Laplaceequation.AWinkler-typefoundationisemployedtomodeltheinteractionofnanotubesandthesurroundingmedium.Theresultsshowthatthesurfaceeffectshavemoreprominentinfluencesonthenaturefrequencywithsmallernanotubethickness,largeraspectratioandlargerelasticmediumconstants.Bothsurfacelayersandtheelasticmediumenhancethestabilityofnanotubes.Thisstudymightbehelpfulfordesigningthefluid-conveyingnanotubedevicesinNEMSandMEMSsystems.

简介：Athoroughunderstandingonthemechanicalpropertiesofcarbonnanotube(CNT)isessentialinextendingtheadvancedapplicationsofCNTbasedsystems.However,conductingexperimentstoestimatemechanicalpropertiesatthisscaleisextremelychallenging.Therefore,developmentofmechanisticmodelstoestimatethemechanicalpropertiesofCNTsalongwiththeintegrationofexistingcontinuummechanicsconceptsiscriticallyimportant.ThispaperpresentsacomprehensivemoleculardynamicssimulationstudyonthesizedependencyandpotentialfunctioninfluenceofmechanicalpropertiesofCNT.Commonlyusedreactivebondorder(REBO)andadaptiveintermolecularreactivebondorder(AIREBO)potentialfunctionswereconsideredinthisregard.Young'smodulusandshearmodulusofCNTsarederivedbyintegratingclassicalcontinuummechanicsconceptswithmoleculardynamicssimulations.TheresultsindicatethatthepotentialfunctionhasasignificantinfluenceontheestimatedmechanicalpropertiesofCNTs,andtheinfluenceofpotentialfieldismuchhigherwhenstudyingthetorsionalbehaviourofCNTsthanthetensilebehaviour.

简介：Inthisstudy,one-dimensionaltitaniananotubes(TNTs)weresynthesizedusingacombinedprocessofchemicalandhydrothermaltreatments,andtheiractivitiesforthephotocatalyticreactionsofselectedgaseouspollutantsatsub-ppmlevelsweredetermined.Additionally,thepropertiesoftheTNTswereexaminedusingselectedspectroscopicmethods.TheannealedTNTsshowedhigherphotocatalyticactivitiesforthefourtargetcompoundsthandidtheunannealedTNTs.Forallthetargetcompoundsexceptbenzene,theeffectoftheannealingtemperatureonthedegradationefficiencywasdifficulttodeterminebecausealldegradationefficiencieswereveryhigh.However,forbenzene,whichdecomposedwithalowefficiency,thedegradationactivitiesoftheTNTsincreasedasthetreatmenttemperaturewasincreasedfrom250to300℃,whiletheydecreasedslightlywhenthetemperaturewasincreasedfrom300to400℃.ThesefindingsconfirmthepresenceofanoptimalannealingtemperatureforthesynthesisofTNTs.Moreover,theaveragedegradationextentsforbenzene,toluene,ethylbenzene,ando-xylenedecreasedfrom92%,96%,99%,and98%to77%,86%,92%,and94%,respectively,astheairstreamflowrateincreasedwithintherangeof1-4L/min.Theaveragedegradationextentsdecreasedfrom12%,75%,87%,and88%to3%,29%,46%,and51%,respectively,astheinputconcentrationincreasedfrom0.4to1.9ppm.Overall,thesefindingssuggestthatone-dimensionalTNTscanbeeffectivelyutilizedforthedegradationofgaseouspollutantsunderoptimaloperationalconditions.

简介：Dispersionofmulti-walledcarbonnanotubesinpoly(p-phenylene)compositeexposedtotoluenewasexperimentallyinvestigated.3mgofmulti-walledcarbonnanotubeswithnominalsizeof20nmwascompoundedwith30mgofpoly(p-phenylene)withthepresenceofterpineolasbindinginitiator.Toinvestigateanoptimalconditionforhomogenizingallconstituents,ultrasonicationwithanoutputpowerof750Wwasemployedwithcompoundingtimeof3,10,20and30min.WithFTIRanalyses,itcouldbeconfirmedthathomogeneouscompositeofmulti-walledcarbonnanotubesandpoly(p-phenylene)couldbeprepared.SEManalyseswerealsoconductedtoexaminethedispersionofmulti-walledcarbonnanotubesinthepolymermatrix.Thenintrinsicelectricalresistanceofthecompositesafterbeingexposedtotoluenewasalsoinvestigated.Itwasfoundthatthecompositefilmpreparedwithultrasonicationfor20mincouldprovidesufficientlysensitiveresponsewithrespecttovariedconcentrationoftoluene.

简介：Multi-walledcarbonnanotubes(MWNTs)with20nmouterdiameterwerepreparedbychemicalvapordepositionofethyleneusingultrafinesurface-modifiedacicularα-Fecatalystparticles.ThegrowthmechanismofMWNTsonthelargercatalystparticlesareattributedtotheinteractionbetweentheFenanoparticleswiththesurface-modifiedsilicalayer.Thisinteraction-mediatedgrowthmechanismisillustratedbystudyingtheelectronic,atomicandcrystalpropertiesofsurface-modifiedcatalystsandMWNTsproductsbycharacterizationwithX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),highresolutiontransmissionelectronmicroscopy(HRTEM),thermalgravimetricanalysis(TGA)andRamanspectra.

简介：Ironcatalystnanoparticleswerepreparedonsiliconwafersbyspin-coatingcolloidalsolutionscontainingironnitrate,polyethyleneglycol(PEG)andabsoluteethanol.Theeffectsofvariousspin-coatingconditionswereinvestigated.Thefindingsshowedthatthesizeoftheironparticleswasgovernedbythecompositionofthecolloidalsolutionusedandthatahighangularspeedwasresponsiblefortheformationofathincolloidalfilm.Theeffectofangularaccelerationonthesizeanddistributionoftheironparticleswerefoundtobeinsignificant.Itwasobservedthatalongerspin-coatingdurationprovokedtheagglomerationofironparticles,leadingtotheformationoflargeparticles.Wealsoshowedthatsingle-walledcarbonnanotubescouldbegrownfromthesmallestironcatalystnanoparticlesafterthechemicalvapordepositionofmethane.