简介：Carbonnanotube(CNT)reinforcedaluminummetalmatrixcompositeswereweldedbyelectronbeamweldingandthemicrostructuresofweldedjointswereinvestigated.TheresultshowedthattheinterfacialreactionhappenedbetweentheCNTsandAlmatrix,whichresultedinproducingbrittleAl_4C_3compoundsinelectronbeamwelds.Theextentofinterfacialreactionvariesgraduallyinthedepthandwidthdirection.ThelengthofthereactantsAl_4C_3becameshortduotothetemperaturegradientinthemoltenpool.ThequantityandsizeofAl_4C_3compoundsincreasedwiththeincreaseofbeamcurrentandthedecreaseofweldingspeedinthemiddlezoneofweld.However,noneedle-likephaseAl_4C_3wasobservedinHAZ.

简介：Inthiswork,dynamicbucklingofarestedlaminananocompositeplateisconsidered.Theplatesarearmedwithsinglewalledcarbonnanotubes(SWCNTs)toobtaintheireffectivecharacteristic;Mori-Tanakamodelisapplied.Accordingtosinusoidalsheardeformationtheory(SSDT),theequationsofgoverningareobtainedusingHamilton'sprincipalandenergymethod.Forcalculatingthedynamicstabilityregion(DIR)ofthestructureBolotin'sandNavier'smethodsareapplied.TheinfluencesofnumberandorientationangleoflayersvolumepercentofSWCNTs,geometricalparametersandelasticmediumofplatesareshownontheDIRofsystem.ResultsshowthatenhancingvolumepercentofSWCNTsincreasestheresonancefrequency.Also,theaccuracyofthisstudyiscomparedwithotherworks

简介：Inthiswork,dynamicbucklingofarestedlaminananocompositeplateisconsidered.Theplatesarearmedwithsinglewalledcarbonnanotubes(SWCNTs)toobtaintheireffectivecharacteristic;Mori-Tanakamodelisapplied.Accordingtosinusoidalsheardeformationtheory(SSDT),theequationsofgoverningareobtainedusingHamilton'sprincipalandenergymethod.Forcalculatingthedynamicstabilityregion(DIR)ofthestructureBolotin'sandNavier'smethodsareapplied.TheinfluencesofnumberandorientationangleoflayersvolumepercentofSWCNTs,geometricalparametersandelasticmediumofplatesareshownontheDIRofsystem.ResultsshowthatenhancingvolumepercentofSWCNTsincreasestheresonancefrequency.Also,theaccuracyofthisstudyiscomparedwithotherworks.

简介：Bimetalliccobalt-rutheniumnanocatalystssupportedoncarbonnanotubes(CNTs)arepreparedusingmicroemultiontechniquewithwater-to-surfactantratiosof0.5—1.5.ThenanocatalystswereextensivelycharacterizedbydifferentmethodsandtheiractivityandselectivityinFischer-Tropschsynthesis(FTS)havebeenassessedinafixed-bedmicroreactor.Thephysicochemicalpropertiesandperformanceofthenanocatalystswerecomparedwiththecatalystpreparedbyimpregnationmethod.Verynarrowparticlesizedistributionhasbeenproducedbythemicroemulsiontechniqueatrelativelyhighloadingsofactivemetals(15wt%Coand1wt%Ru).AccordingtoTEMimages,smallCoparticles(2—7nm)weremostlyconfinedinsidetheCNTs.Comparingwiththecatalystpreparedbyimpregnation,theuseofmicroemulsiontechniquewithwatertosurfactantratioof0.5decreasedtheaveragecobaltoxideparticlesizeto4.8nm,thedispersionwasalmostdoubledandthereductionincreasedby28%.Activityandselectivitywerefoundtobedependentonthecatalystpreparationmethodandwater-to-surfactantratio(aswellascobaltparticlesizes).COconversionincreasedfrom59.1%to75.1%andtheFTSrateincreasedfrom0.291to0.372gHC/(gcath).C5+liquidhydrocarbonsselectivitydecreasedfrom92.4%to87.6%.

简介：摘要：聚苯醚(PPO)具有优异的耐高温、易加工、低介电等特性，在电子领域具有广泛的应用潜力。本文以改性聚苯醚(MPPO)为基体，将改性氮化硼(BN)、碳纳米管(CNTs)作为复合填料，通过溶液混合、热压工艺制备出具有高导热系数的聚苯醚基复合材料。在60 wt%改性BN的基础上，提高CNTs的填充率可以大幅提升复合材料的导热性能。当CNTs的填充率为4.0 wt%时，复合材料的导热系数提高到4.12 W/(m·K)，相比单一BN填料下复合材料导热系数提升了37.8%，是纯树脂基体的17.2倍. 所制备的复合材料将在电子设备热管理领域具有非常大的应用潜力。

简介：采用搅拌铸造法制备了CNTs／ZM5镁合金复合材料。测试了铸态条件下复合材料的高温力学性能，并对微观组织和断口形貌进行了观测和分析。研究结果表明：CNTs／ZM5复合材料具有良好的高温力学性能，在拉伸速度为lmm／min以及温度为150℃时其抗拉强度可达149．92MPa，但是，碳纳米管加入量过多会导致偏聚，从而使高温性能下降。

简介：BimetallicFe-Mnnanocatalystssupportedoncarbonnanotubes(CNTs)werepreparedusingmicroemulsiontechniquewithwater-to-surfactantratiosof0.4-1.6.ThenanocatalystswereextensivelycharacterizedbydifferentmethodsandtheiractivityandselectivityinFischer-Tropschsynthesis(FTS)havebeenassessedinafixed-bedmicroreactor.Thephysicochemicalpropertiesandperformanceofthenanocatalystswerecomparedwiththecatalystpreparedbyimpregnationmethod.Verynarrowparticlesizedistributionhasbeenproducedbythemicroemulsiontechniqueatrelativelyhighloadingofactivemetal.TEMimagesshowedthatsmallmetalnanoparticlesintherangeof3–7nmwerenotonlyconfinedinsidetheCNTsbutalsolocatedontheoutersurfaceoftheCNTs.Usingmicroemulsiontechniquewithwatertosurfactantratioof0.4decreasedtheaverageironparticlesizesto5.1nm.Thereductionpercentageanddispersionpercentagewerealmostdoubled.Activityandselectivitywerefoundtobedependentonthecatalystpreparationmethodandaverageironparticlesize.COconversionandFTSrateincreasedfrom49.1%to71.0%and0.144to0.289gHC/(gcath),respectively.WhiletheWGSratedecreasedfrom0.097to0.056gCO2/(gcath).C5+liquidhydrocarbonsselectivitydecreasedslightlyandolefinsselectivityalmostdoubled.

简介：针对搅拌摩擦加工法制备的碳纳米管增强铝基复合材料的主要碳纳米管团聚缺陷,提出超声波衰减法对加工质量进行无损评价,通过改变搅拌摩擦加工次数得到不同团聚程度的碳纳米管增强铝基复合材料;根据超声衰减理论分别测量各个试样的衰减系数,从宏观上对团聚缺陷进行评价,最大和最小衰减系数相差50倍,通过超声特征扫描成像检测法验证了评价结果的有效性;同时测量了搅拌摩擦加工次数为3次和6次的纯铝试样的衰减系数分别是0.032、0.029dB/mm,基本排除了在搅拌摩擦加工后纯铝晶粒变化对试验结果带来的影响;最后又采用超声衰减法从微观角度对团聚缺陷进行评价,随着搅拌次数增加,衰减系数从0.178dB/mm变化到0.025dB/mm,每搅拌1次衰减系数降低约1倍,可以得出团聚程度越严重,衰减系数越高。

简介：通过溶胶凝胶方法制备SiO2修饰的碳纳米管（SiO2-CNTs）为载体材料,利用微波辅助加热化学还原方法制备Pt/SiO2-CNTs电催化剂。然后分别利用扫描电子显微镜和能量散射谱仪对Pt/SiO2-CNTs电催化剂的表面形貌和元素组成进行了表征。在酸性介质中,采用循环伏安法研究了Pt/SiO2-C电催化剂对乙醇氧化的电催化活性。与商用催化剂PtRu/C电催化剂相比,在相同催化剂载量和实验条件下,Pt/SiO2-CNTs电催化剂具有更好的催化活性和抗CO中毒能力。

简介：本文应用了一种方便有效的方法制备了碳纳米管四氧化三铁复合物（CNTs／Fe3O4）修饰电极，并在修饰电极干燥过程中应用了磁场。这种在磁场作用下制备的修饰电极对多巴胺（DA）表现出很强的电催化活性。采用了X射线衍射（XRD）、透射电子显微镜（TEM）对制备出来的碳纳米管四氧化三铁复合物的组成、形貌和结构进行了表征。扫描电子显微镜（SEM）对修饰电极的表面形貌进行了表征，循环伏安法（CV）和示差脉冲伏安法（DPV）对修饰电极的电化学性能进行了表征。实验表明，该电极对多巴胺的电化学氧化具有明显的催化作用。用DPV对多巴胺进行了测定，其氧化峰电流与多巴胺的浓度在6．0×10^-7-4．3×10^-4mol·L^-1范围内呈良好的线性关系，线性相关系数为0．9989，检出限（S／N=3）为3．2×10^-8mol·L^-1。

简介：Carbonnanotube（CNTs）/Fe-Ni/TiO2nanocompositephotocatalystshavebeensynthesizedbyaninsitufluidizedbedchemicalvapordeposition（FBCVD）method.ThecompositephotocatalystswerecharacterizedbyXRD,Ramanspectroscopy,BET,FESEM,TEM,UV-visspectroscopy,andXPS.TheresultsshowedthattheCNTsweregrowninsituonthesurfaceofTiO2.Fe（lll）inTiO2showednochemicalchangesinthegrowthofCNTs.Ni（Ⅱ）waspartlyreducedtometalNiintheFBCVDprocess,andthemetalNiactedasacatalystforthegrowthofCNTs.ThephotocatalyticactivitiesofCNTs/Fe-Ni/TiO2decreasedwiththeriseoftheFBCVDreactiontemperature.ForthesamplesynthesizedatlowFBCVDtemperature（500℃）,morethan90%andnearly50%ofmethylenebluewereremovedunderUVirradiationin180minandundervisiblelightirradiationin300min,respectively.TheprobablemechanismofsynergisticenhancementofphotocatalysisontheCNTs/Fe-Ni/TiO2nanocompositeisproposed.

简介：

简介：采用热处理和机械混合的方法制备CNTs-TiO2锂离子电池负极材料。CNTs-TiO2负极材料的表面形态及物相通过扫描电子显微镜（SEM）、BET比表面积测试和X射线衍射（XRD）仪进行表征;通过充放电循环测试,表征CNTs-TiO2负极材料的充放电库仑效率、充放电性能及循环性能。实验结果表明：CNTs-TiO2在倍率为0.1C时,首次放电比容量达到213mAh·g-1,在第50次循环后,比容量稳定在143mAh·g-1,体现出良好的循环稳定性。

简介：

简介：Bysimultaneouslyemployingbothanelectro-opticmodulatorandcarbonnanotubesaturableabsorber（CNT-SA）inadual-lossmodulator,asubnanosecondsinglemode-lockingpulseunderneathaQ-switchedenvelopewithhighpeakpowerwasgeneratedfromadoublyQ-switchedandmode-locked（QML）Nd:Lu0.15Y0.85VO4laserat1.06μmforthefirsttime,toourknowledge.CNTswithdifferentwallstructures—single-walledCNTs（SWCNTs）,double-walledCNTs（DWCNTs）,andmulti-walledCNTs（MWCNTs）—wereusedasSAsintheexperimenttoinvestigatethesinglemode-lockingpulsecharacteristics.Atpumppowerof10.72W,themaximumpeakpowerof1.312MWwasobtainedwiththeDWCNT.

简介：以CNTs和A1203为载体担载镍催化剂用于二氧化碳甲烷化反应，并研究Ce助剂对Ni／CNTs和Ni／Al2O3的催化剂的催化性能的影响，通过程序升温还原（H2－TPR）、X射线衍射（XRD）、程序升温脱附（H2－TPD）对催化剂进行表征，结果表明，以XCNTs载体的催化剂性能明显优于以Al2O3为载体的催化剂；以CNTs载体催化剂的镍物种易于还原，同时，Ce的加入进一步促进了镍物种的还原，提高镍物种分散性。这些结果最终使Ni—Ce／CNTs在CO2甲烷化中表现出优异的催化性能。