简介:Basedonthegivenreactionconditionandmedium,thegrowthofmicro-andnanocrystalscanbedividedintofourtypes,growthinsolutionatnormalpressure,hydrothermalgrowth,solvothermalgrowth,andmolten-saltgrowth.Whenthewaterororganicsolventasthereactionmedium,surfactant,suchassodiumdodecylbenzenesulfonate,canbeaddedtoregulatethe
简介:Rare-earthcoordinationpolymers(RECPs),asafamilymemberofcoordinationpolymers(CPs),havebeenpreparedandstudiedwidely.Thankstotheircharacteristicpropertiesandfunctions,RECPshavealreadybeenusedinvariousapplicationfieldsrangingfromcatalysistodrugdelivery.Inrecentyears,CPswithtunablemorphologiesandsizeshavedrawnincreasinginterestandattractiveattention.ThisreviewpresentstherecentresearchprogressofRECPmicro/nanomaterials,andemphasizesthepreparation,propertiesandbroadapplicationsofthesefascinatingmaterials.
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。
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.
简介:Ahumanfacewithcomplex3Dstructureismachinedwithamodifiedfix-lengthcompensationmethodinthispaper.ThefastdevelopmentofMEMS(MicroElectromechanicalSystems)hasstronglyenhancedtheapplicationofnewharderworkmaterials.Asalowcost,flexible,goodrepeatablemachiningprocesswithnegligibleprocessforces,micro-EDMmillingiswellsuitedforfreeformmetallicmicrostructures.Amajorprobleminmicro-EDMmillingofcomplex3Dstructureistheelectrodewear.AnewCAMsystembasedontheUGsoftwareplatformisdevelopedinordertogetgoodaccuracyandhigherefficiency.Acorrectioncoefficientisintroducedanddeducedforthemodifiedfix-lengthcompensationmethod.Usingthismethodahumanfacewithcomplex3Dstricterismachinedsuccessfullybymicro-EDMmilling.
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。
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.