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87 个结果
  • 简介:一步舞预告的处理,阳极化,被用来激活基于的polyacrylonitrile(平底锅)碳纤维而不是平淡的二拍子的圆舞预告的处理,有SnCl2的促进感受性和有PdCl2的激活。基于平底锅的碳纤维的graphitization上的阳极化预告的处理的效果作为功能被调查捏催化剂。基于平底锅的碳纤维在导致活跃地点的形成的H3PO4电解质被阳极化,它从而便于下列无电捏涂层。碳纤维当面并且缺席捏涂层热被对待,结构的变化被X光检查衍射和拉曼光谱学描绘,哪个显示基于平底锅的碳纤维的graphitization被阳极化处理和催化剂加速捏。用阳极化的碳纤维,平淡的二拍子的圆舞预告的处理,促进感受性和激活,不被需要。

  • 标签: 聚丙烯腈基碳纤维 PAN基碳纤维 阳极氧化处理 石墨阳极 氧化预处理 X射线衍射
  • 简介:镁为生物医学的应用作为革命可被细菌破坏的金属被建议了。然而,镁的腐蚀太快速,不能匹配织物愈合的率并且另外,展出局部性的腐蚀机制。因此为他们的实际使用控制镁的腐蚀行为是必要的。这篇论文包括地在代表性的镁的开发考察研究进步基于合金,包括象体积一样的Mg-Ca,Mg-Sr,Mg-Zn和Mg-REE合金系统金属性的玻璃。他们的微观结构,机械性质和腐蚀行为上的alloying元素的影响被总结。机械并且腐蚀性质做镁合金也演员组合金与那些比较被讨论。而且,这评论也盖住为生物医学的应用在镁合金上在可能减解的涂层的领域里执行的研究。钙磷酸盐和可被细菌破坏的聚合物涂层基于使用的不同准备技术被讨论。我们也在镁合金底层的腐蚀行为上比较不同涂层的效果。

  • 标签: 可降解生物材料 镁基合金 审查 生物医学应用 大块金属玻璃 变形镁合金
  • 简介:Thisstudydealtwiththeelectrostrictiveresponsesofpolyurethane(PU)actuatorswithdifferentmicrophaseseparationstructure,whichwasapromisingcandidateforamaterialusedinpolymeractuators.InordertoconstructPUswithdifferenthigher-orderstructure,PUswithvarioustypesofpolyolweresynthesized:poly(neopentylglycoladipate)(PNAD),poly(tetramethyleneglycol)(PTMG),andpoly(dimethylsiloxnae)(PDMS).SynthesizedPUwascharacterizedbyFouriertransform-infrared(FT-IR)spectroscopyandgelpermeationchromatography(GPC).ThermalanalysisandmechanicalpropertiesofPUfilmswerecarriedoutwithdifferentialscanningcalorimetry(DSC)andUTM(universaltestingmachine),respectively.AndPUactuatorwasformedinatypeofmonomorph,whichwasmadebycarbonblackelectrodesonthebothsurfacesofPUfilmbyspincoatingmethod.ActuationbehaviorwasmainlyinfluencedonmicrophaseseparationstructureandmechanicalpropertyofPU.Inresult,PUactuatorwithPNAD,polyesterurethane,hadthelargestfield-induceddisplacement.

  • 标签: 聚酯聚氨酯 执行机构 傅立叶变换红外光谱 多元醇 微相分离结构 基础
  • 简介:称片的方法被用来调查不同水泥(灰)浆的不饱和的水运输。锋利的弄湿前面存在在期间的试验性的结果表演浇运输,运输能被一个非线性的散开方程描述,;搬运有水的各种各样的规则材料满足的不同材料展览的系数。所有各种各样的水里的水泥(灰)浆的苍蝇灰减少运输系数的增加满足,甚至变化运输机制。

  • 标签: 水上运输 水泥材料 非饱和水流 运输系数
  • 简介:Graphene由于它的非凡的物理、化学的性质在许多应用与大潜力作为新碳nanoform出现了。特别,graphene和它的衍生物也作为新部件在生物医学的领域里正在获得很多兴趣为生物传感器,织物工程,和药交货。这评论介绍graphene,graphene的简历效果和它的衍生物的唯一的性质,特别和房间的他们的相互作用和为癌症诊断和治疗的基于graphene的生物传感器和nanomedicines的发展。

  • 标签: 细胞生物学 石墨 基础 生物传感器 设备 化学性质
  • 简介:Fluoropolymeranddifferentkindsofsilicaparticleswereusedforcontrollingsurfacechemistryandmorphology,respectively.Asuperhydrophobicsurfaceoriginatedfromstrawberry-likeorquincunx-shapedcompositesilicaparticleswasobtained.Thedualsizeparticlesareobtainedbyutilizingthegraftofdifferentmodifiedsilicaparticleswithepoxyfunctionalgroupandaminefunctionalgroup.Thismakesthesurfaceoffilmformacompositeinterfacetohaveirregularbinarystructurewhichplaysanessentialroleintrappingairbetweenthesubstratesurfaceandtheliquiddropletstobenecessaryforhighcontactangleandlowcontactanglehysteresis.Themaximumcontactangleforwateronthehybridfilmisabout174±2°andthecontactanglehysteresisislessthan2°.Thesurfacemorphologies,roughnessandthewettabilityonthesurfaceoffilmscontainingdifferentstructuralsilicaparticleswerecompared.Itwasshownthatthehierarchicalirregularlystructurewithalowroughnessfactorandhighair-trappedratioisindispensableforsuperhydrophobicsurface.Althoughthisstructuralsurfacesbasedoncompositesilicaparticlesplayavitalroleingoverningthesurfacewettability,itisnecessarytocombinewithalowsurfaceenergytomakethesurfacesuperhydrophobic.

  • 标签: 分级不规则结构 硅石 颗粒物 含氟聚合物
  • 简介:Machinetoolhasbeenwidelyusedintheproductionofthemilitaryandcivilian.Themachiningprecisionoftheworkpieceisthedirectreflectionforthemachiningperformanceofmachinetool.Withtheimprovementforrequirementofthemachiningprecision,improvingtheaccuracyofmachiningisbecomingimportant.Guidewayandspindlearethekeymotioncomponentsthatdecidedtheshape,therelativepositionandthesurfaceroughnessoftheworkpiece.Inordertoadapttotherequirementsoftheworkpiecemachining,thispaperanalyzestheerrorsofguidewayandspindlethataffecttheaccuracyoftheprocessing,establishesthemotionrelationsforeveryerrorsofguidewayinmachiningprocess,identifiestheregularforthestraightness,bendingoftheguidewayandrotatingerrorofspindlethatinfluencestheworkpiecesurface.Finally,accordingtothecorrelationanalysisofthemeasuredandthesimulationresults,themotionerrorofmachinetoolisidentified,whichlaysthefoundationforimprovingtheaccuracyofmachinetoolinnextstep.

  • 标签: CORRELATION analysis ERROR IDENTIFICATION GUIDEWAY ERROR
  • 简介:ThefracturetoughnessandfractureworkofAl2O3/SiCprismaticceramiccompositeswasevaluatedinthispaper,whichshowedthefractureenergywasimprovedgreatly.Basedontheobservationforcrackpropagationandfracturemorphology,thefracturebehavioroftheprismaticcompositeswasanalyzed.Inthebendingtest,thecompositesdisplayedanon-catastrophicbehaviorandagracefulfailurewithreasonableload-carryingcapability.

  • 标签:
  • 简介:Diamond-likecarboncoatingshavebeenusedassolidlubricatingcoatingsinvacuumtechnologyfortheirgoodphysicalandchemicalproperties.Inthispaper,thehybridtechniqueofunbalancedmagnetronsputteringandplasmaimmersionionimplantation(PIll)wasadoptedtofabricatediamond-likecarbon-basedfunctionallygradientfilm,N/TiN/Ti(N,C)/DLC,onthe304stainlesssteelsubstrate.ThefilmwascharacterizedbyusingRamanspectroscopyandglancingX-raydiffraction(GXRD),andthetopographyandsurfaceroughnessofthefilmwasobservedusingAFM.Themechanicalpropertiesofthefilmwereevaluatedbynano-indentation.Theresultsshowedthatthesurfaceroughnessofthefilmwasapproximately0.732nm.Thehardnessandelasticmodulus,fracturetoughnessandinterfacialfracturetoughnessofN/TiN/Ti(N,C)/DLCfunctionallygradientfilmwereabout19.84GPa,190.03GPa,3.75MPa.m1/2and5.68MPa@m1/2,respectively.ComparedwiththatofDLCmonolayerandC/TiC/DLCmultilayer,thisDLCgradientfilmhasbetterqualitiesasasolidlubricatingcoating.

  • 标签: 类金刚石 功能 梯度薄膜 氮化钛 AFM 拉曼散射光谱
  • 简介:交流阻抗是一个新方法由电气化学的参数的变化在水和和水泥浆糊的变硬的过程期间学习毛孔结构和水和度的变化。采用的交流阻抗方法,我们与苍蝇灰和炉渣学习了水和和水泥浆糊的变硬的过程,并且在阻抗参数上分析了不同水和年龄,水文件夹比率和矿物质混合的影响。而且,我们由测试方法和X光检查衍射的常规孔把结果与那些作比较方法。结果证明那交流阻抗能在水泥和具体研究作为一种新技术被拿。

  • 标签: 交流阻抗法 水泥基材料 水化过程 X射线衍射法 硬化过程 电化学参数
  • 简介:Grapheneisaremarkablematerialwithgreatpotentialinmanyapplicationsduetoitschemicalandphysicalproperties.Inthisreviewwebrieflypresenttherecentresearchprogress(2016-2018)ingrapheneandgraphene-basednanomaterialssynthesisanddiscussthepracticalaspectsofusingthematerialsproducedviathesemethodsfordifferentgraphene-basedapplications.

  • 标签: GRAPHENE SYNTHESIS NANOMATERIALS graphene-based applications
  • 简介:StructurehealthmonitoringbasedondiagnosticLambwaveshasbeenfoundtobeoneofthemostpromisingtechniquesrecently.Thispaperhasabriefreviewofthenewdevelopmentsonthismethodincludingthebasicnovelofthemethod,fundamentalsandmathematicsofLambwavepropagation,narrowbandandwidebandLambwaveexcitationmethods,optimizationofexcitationfactorsanddiagnosticLambwaveinterpretationmethods.

  • 标签: A结构健康监测 无损检测 射线检验 兰姆播 SHM
  • 简介:Polyacrylate-basedconductivecoatingswerepreparedfrompolyacrylateemulsionasmatrixandcarbonblack(CB)whosesurfacewastreatedwithtitanatecouplingagentasconductingparticles.OnekindoforganiccrystalwasaddedtostudyitseffectsontheelectricalconductivityandPTC(positivetemperaturecoeffi-cient)effectoftheconductivecoatings.ExperimentalresultsshowthatthecoatingscontainingonlypolyacrylateemulsionandCBexhibitanexcellentelectricalconductivitybutbadPTCeffect,andwhenorganiccrystalisadded,PTCeffectischaracterizedandcanincreaseby2ordersofmagtitude.Thecriticaltransformationtemperatureofpolyacrylateemulsion/CBPTCcompositesisdecidedbymeltingpointoforganiccrystals.

  • 标签: 聚丙烯酸酯 导电涂层 正温度系数效应 PTC效应 炭黑