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15 个结果
  • 简介:Basedonthegivenreactionconditionandmedium,thegrowthofmicro-andnanocrystalscanbedividedintofourtypes,growthinsolutionatnormalpressure,hydrothermalgrowth,solvothermalgrowth,andmolten-saltgrowth.Whenthewaterororganicsolventasthereactionmedium,surfactant,suchassodiumdodecylbenzenesulfonate,canbeaddedtoregulatethe

  • 标签: 英语 阅读 理解 纳米材料与技术
  • 简介:Rare-earthcoordinationpolymers(RECPs),asafamilymemberofcoordinationpolymers(CPs),havebeenpreparedandstudiedwidely.Thankstotheircharacteristicpropertiesandfunctions,RECPshavealreadybeenusedinvariousapplicationfieldsrangingfromcatalysistodrugdelivery.Inrecentyears,CPswithtunablemorphologiesandsizeshavedrawnincreasinginterestandattractiveattention.ThisreviewpresentstherecentresearchprogressofRECPmicro/nanomaterials,andemphasizesthepreparation,propertiesandbroadapplicationsofthesefascinatingmaterials.

  • 标签: COORDINATION POLYMER METAL-ORGANIC framework RARE earth
  • 简介:有嵌入的金属性的Ninanocrystal(Ni-BaTiO3)的取向附生的BaTiO3电影成功地在SrTiO3(001)上被制作通过激光的单人赛水晶的底层分子的横梁取向附生(L-MBE)技术。高决定传播电子显微镜学(HRTEM)和有Kramers-Kronig分析方法的电子精力损失光谱(鳗)被采用描绘微观结构,基本分发和这些电影的电子结构。HRTEM结果建议BaTiO3的结构与a=0.399nm和c=0.403nm的格子参数是四角形的。精力散X光检查光谱学(EDX)证实了在BaTiO3取向附生的电影成功地嵌入的金属性的Ninanocrystal。Ni-BaTiO3合成电影与NiNC轮流出现的取向附生的BaTiO3(110)层是复合的数组(111)层。而且,嵌入Ninanoparticles导致的不合身的衣服脱臼的存在被HRTEM图象清楚地也表明。鳗的NiL2,3边表明处于他们的金属性的状态的NiNC在BaTiO3矩阵一致地被嵌入。关于在Ni鳗的L3边的大约7eV的化学移动也被观察。在这些电影的BaTiO3的光乐队差距是大约3.84eV,高,比3.55,为纯BaTiO3的eV在空间拍摄温度。

  • 标签: 纳米复合薄膜 微结构 高分辨透射电子显微镜 钛酸钡薄膜 激光分子束外延 电子能量损失谱
  • 简介:Themajorobjectiveofthisresearchwastodiscusstheeffectsofloadingrateontheflexural-tensionpropertiesanduniaxialcompressivestrengthofmicro-surfacingmixtureusingthree-pointbendingtestanduniaxialcompressivetestrespectively.Asapreventivemaintenancesurfacetreatmentonasphaltpavement,micro-surfacingwasformedonthebasisoftheISSArecommendationofanoptimummicro-surfacingdesign.Testswereconductedoverawiderangeoftemperaturetoinvestigatethedifferenceofpropertiesfromlowloadingratetoarelativelyhighloadingrate.Three-pointbendingtestwasusedtostudytheflexuralstrength,strainandmodulusofmicro-surfacingmixture,anduniaxialcompressivetestwascarriedouttoobtaintherelationshipbetweenstrengthandtheloadingrateaswellastemperature.Theexperimentalresultsshowedthatflexuralstrengthathighloadingratewaslargerthanthatatlowloadingrate.Theflexuralstrengthdifferencebetweenlowandhighloadingrateenlargedwhenthetemperaturerose.Theflexuralstrainathighloadingrateincreasedcomparedwithresultsofthelowloadingrate.Resultsoftheflexuralmodulusrevealedthatmicro-surfacingmixtureexhibitedbetteranti-crackingcharacteristicatlowtemperaturewhengivenarelativelylowloadingrate.Resultsofuniaxialcompressivetestrevealedthatthestrengthdifferenceofmicro-surfacingamongdifferentloadingratesincreasedwiththeincreaseoftemperature.Thelogarithmrelationshipbetweenthestrengthandloadingrateoverawiderangeoftemperaturewasobtainedtocomparetheexperimentalandpredictedvalues,whichresultinginareasonableconsistency.

  • 标签: 三点弯曲试验 单轴抗压强度 拉伸性能 加载速率 微表处 混合料
  • 简介:Ahumanfacewithcomplex3Dstructureismachinedwithamodifiedfix-lengthcompensationmethodinthispaper.ThefastdevelopmentofMEMS(MicroElectromechanicalSystems)hasstronglyenhancedtheapplicationofnewharderworkmaterials.Asalowcost,flexible,goodrepeatablemachiningprocesswithnegligibleprocessforces,micro-EDMmillingiswellsuitedforfreeformmetallicmicrostructures.Amajorprobleminmicro-EDMmillingofcomplex3Dstructureistheelectrodewear.AnewCAMsystembasedontheUGsoftwareplatformisdevelopedinordertogetgoodaccuracyandhigherefficiency.Acorrectioncoefficientisintroducedanddeducedforthemodifiedfix-lengthcompensationmethod.Usingthismethodahumanfacewithcomplex3Dstricterismachinedsuccessfullybymicro-EDMmilling.

  • 标签: MICRO-EDM MILLING COMPENSATION cAM
  • 简介:微弧的氧化(毛)/zinc硬脂酸盐(ZnSA)合成涂层经由毛与superhydrophobicZnSA的电极淀积处理并且随后的封上被制作。表面形态学,化学作文和涂层的腐蚀抵抗用扫描电子显微镜学的地排放被调查,Fourier变换红外线,X光检查衍射并且电气化学并且氢进化大小。结果显示毛涂层被下列superhydrophobicZnSA涂层高效地封上。MAO/ZnSA合成涂层显著地由于它的superhydrophobic功能提高了Mg合金Mg-4Li-1Ca的腐蚀抵抗。另外,腐蚀机制为合成涂层被建议并且讨论。

  • 标签: 镁合金 微弧的氧化 Superhydrophobic 涂层 腐蚀
  • 简介:一篇小说微为金属(MFCM)扔保险丝为生产A356铝合金泥浆的过程被建议。MFCM意味着精制金属泥浆从坩锅的底部的插头外面被贴在水平活动的板。在生产软件的3D的帮助下,melt被团结并且由层形成了层。激动人心能由于毁坏树突手臂的shear力量把成分和金属泥浆制服的热散开放在坩锅。A356合金的先令和liquidus温度是559.2和626.3'

  • 标签: 微扔保险丝 激动人心的速度 微观结构 机械性质
  • 简介:Aseriesofflexiblepoly(m-phenyleneisophthalamide)(PMIA)-basedcompositeswithdifferentsizesandmassfractionsofhexagonalboronnitride(hBN)weresuccessfullymanufacturedforthefirsttimeviathecastingtechnique.TheeffectsofmodifiedhBNparticlesonmicrostructure,mechanicalproperties,dielectricpropertiesandthermalconductivitiesoffabricatedcompositeswereinvestigated.TheresultsindicatethatmodifiedhBNparticlesmanifestgoodcompatibilitywiththePMIAmatrix.TheYoung'smodulusandTheat-resistanceindexofPMIA-basedcompositesareincreasedwithincreasingthemassfractionofhBNparticles.Duetoadditionalthermalconductivepathsandnetworksformedbynano-sizedhBNparticles,theK-m/n-hBN-30compositedisplaysthethermalconductivityof0.94W·m^-1·K^-1higherthanthatoftheK-m-hBN-30composite(0.86W·m^-1·K^-1),andmorethan4timeshigherthanthatofneatPMIA.Moreover,theobtainedPMIA-basedcompositesalsoshowlowdielectricconstantandidealdielectricloss.Owingtotheexcellentcomprehensiveperformance,hBN/PMIAcompositespresentpotentialapplicationsinthebroadfieldofelectronicmaterials.

  • 标签: poly(m-phenylene isophthalamide)(PMIA) thermal CONDUCTIVITY hBN PARTICLES
  • 简介:主要介绍了工业CT系统的基本组成部件和影响工业CT检测的关键性能指标,及工业CT在物品检测、地质研究、疲劳裂纹检测、快速成型和逆向工程等实际工程方面的应用情况,展望了工业CT在再制造零部件寿命预测、再制造产品的安全验证和再制造产品的推广前景。

  • 标签: 工业CT 组成 性能
  • 简介:用X光检查的应用程序,有在造的提高的温度,显微镜的损坏进化进程观察和图象的聚丙烯纤维的C80高张力水泥的计算断层摄影术(CT)技术能被获得,基于统计理论和具体内部缺点扩展和显微镜的结构的进化整齐的联合的数字分析。expermental结果证明缺点率在不同温度变化了并且能决定具体降级阀值温度。另外,数据分析能帮助建立在缺点率和温度损坏的效果之间的进化方程,并且鉴别在在高温度的高力量水泥的聚丙烯纤维的增加能改进裂开的抵抗。

  • 标签: 聚丙烯纤维 高强混凝土 缺陷分析 CT图像 高温 混凝土内部缺陷