简介:Nanomaterialspossessintriguingopticalpropertiesthatdependsensitivelyonsize,shape,andmaterialcontentofthestructures.Controllingsuchstructuralcharacteristicsofthenanostructuresallowsthetailoringoftheirphysicalandchemicalproperties,e.g.optical,electronic,andcatalytic,toachievewhatisdesiredforspecificapplicationsofinterest.Thisreviewwillcoverthedevelopmentofvariousshapesforsilverandgoldnanomaterialswithemphasisontheirrelationtoopticalproperties.Examplesofvariousmodernsyntheticmethodsandcharacterizationtechniquesarehighlighted.Theinfluenceofthemetalnanomaterial'sshapeandopticalabsorptiononsurfaceenhancedRamanscattering(SERS)andafinalnoteonnewemergingapplicationsofmetalnanostructuresarealsodiscussed.
简介:Fibrestressofglassfibrereinforcedpolymericcopmositesonloadisdeterminedbyusingopticalfibreasmodelfiberandbymeansoflaserinterferencemethod.Inaddition,theoriginationoffibrestressduringmouldingprocessofcompositesandtherelationbetweenfiberstressofloadedcompositesandexternalstressareexamined.Theexperimentsshowthatfibrestressisrelatedtomolecularstructureofinterfacialmaterialsandstructureofinterfaciallayers.Whenstressistransferredfrommatrixtofibre,eachinterfaciallayerhasdifferentstressgradientanddeformability.Thispropertycanbecharacterizedbyintroducinganinterfacialstresstransfercoefficientktothetwo-phasemodel.
简介:Ionimplantationisapowerfulmethodforfabricatingnanoparticlesindielectric.Fortheactualapplicationofnanoparticlecomposites,acarefulcontrolofnanoparticleshastobeachieved.Inthisletter,thesize,distributionandmorphologyofAgnanoparticlesarecontrolledbycontrollingtheioncurrentdensity,ionimplantationsequenceandionirradiationdose.SinglelayerAgnanoparticlesareformedbyAg+ionimplantationatcurrentdensityof2.5μA/cm2.ByAgandCuionssequentialimplantation,thesizeofsinglelayerAgnanoparticlesincreases.While,byCuandAgionssequentialimplantation,uniformAgnanoparticleswithwidedistributionareformed.ThemorphologyofAgnanoparticleschangestohollowandsandwichednanoparticlesbyCu+ionirradiationtodosesof3×1016and5×1016ions/cm2.TheopticalabsorptionpropertiesofAgnanoparticlesarealsotailoredbytheseways.
简介:Thispaperintroducesthefundamentalprincipleandfeaturesofmagneto-opticalstoragetechnology,anddiscusesthetrendandaseriesofkeytechniquesforincreasingthedatastoragedensityofmagneto-opticaldisk.ThethreewaysincludingMOmedia,recordingmethodandreadoutmethodforincreasingthediskcapacityhavebeendiscussed.Moreover,theimportancewiththeexchange-coupledeffectbetweenthemagneticlayersandrecordingdomainmorphologyisemphasized.
简介:在为光玻璃BK7的擦伤过程的有弹性塑料的转变政体和易碎可锻的转变政体被分析基于赫兹波方程和被魏建议的压力比率理论。为有变量被有限元素模拟的ABAQUS软件基于精力破裂理论模仿的砂砾间隔距离的光玻璃BK7的交往的擦伤进程。为光玻璃BK7的双砂砾交往擦伤测试在DMG超声的70-5上被执行线性,由哪个有限元素模拟的可靠性被验证。细工品的表面形态学被扫描电子显微镜学(SEM)分析,它证明沟的宽度随擦伤深度和砂砾间隔距离的增加显然增加了。沟的宽度的结果与模拟结果一致。表面下的损坏层被蚀刻的HF酸的方法分析,它证明有交叉的裂缝的一个区域。抓的力量被KISTLER的threedimensional测力计测量,它证明第二抓的力量随抓深度和砂砾间隔距离的增加增加了。在第二处擦伤的力量在第一次是比那小的,它与Griffith破裂理论一致。
简介:Nanocapacitors和nonvolatile铁电体随机存取记忆要求nanoscale有铁电体性质的薄电影涂层。一维的铁电体nanofibers由于记忆设备元素的维数的减少将减少探讨并且有点增加存储能力的事实在铁电体记忆设备被使用。展出铁电体性质的新奇ZnO/BaOnanocomposite纤维被大音阶的第五音从大音阶的第五音胶化线路导出的electrospinning在非编织的网孔形式准备了。平均直径的薄圆柱的nanofibers100nm被获得了,他们的形态学被SEM和AFM图象证实。在electrospinning过程,纤维形态学上的工作距离的效果被学习,它证明没有祷告和减少,在11和15厘米之间的那工作距离能在这在工作距离生产纤维范围增加纤维直径。粉末XRD被用来鉴别阶段和EDX分析证实了ZnO/BaO的存在。绝缘、非线性的光性质也被学习了。绝缘的研究证明ZnO/BaO合成nanofibers在323K从铁电体经历阶段转变到paraelectric。
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简介:ThedistributedopticalfibersensingtechnologywasusedtoinvestigatethefracturebehavioroftheEpoxyAsphaltMixture.Thespatialdistributionandvariationofthestraindevelopmentwithcrackpropagationwereacquiredusingthebrillouinopticaltime-domainreflectometerthroughtheloadingexperimentsofthecompositebeamstructure.Inaddition,afiniteelementmodelofthecompositebeamstructurewasdevelopedtoanalyzethemechanicalresponsesoftheepoxyasphaltmixtureusingtheextendedfiniteelementmethod.Theexperimentalresultsshowthatthedevelopmentofcrackpropagationbecomesinstablewiththeincreaseoftheload,andlargerloadswillgeneratedeepercracks.Moreover,thenumericalresultsshowthatthemechanicalresponseofthecracktipchangeswiththecrackpropagation,andtheworstareasthatsubjectedtocrackdamagearelocatedonbothsidesofthecompositebeamstructure.
简介:在苏打石灰玻璃里嵌入的银nanoclusters(NC)被电的fieldassisted散开(EFAD)并且连续退火综合。样品被紫外力的吸收光谱学,光致发光光谱学,X光检查光电子光谱学(XPS),和一生大小描绘。银的生长聚类的试验性的结果表演被退火的温度和居住时间赞成。同样传播、退火的玻璃样品在紫外刺激下面在550nm附近显示出光致发光,它能与L中心和Ag3的存在被联系+簇。并且增加在SPR的外观的结果达到顶点的退火的温度和居住时间并且光紧张减少因为Ag3+簇长大进Agnanoparticles。
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简介:Anovelsolubleπ-conjugatedpolymer,poly[(3-acetylpyrrole-2,5-diyl)p-(N,N-dimethylamino)azobenzylidene](PAPDMAABE),wassynthesizedbycondensationof3-acetylpyrrolewith4-aldehyde-4'-dimethylaminoazobenzene(ADMAA).ThechemicalstructureofPAPDMAABEwascharacterizedbyFouriertransforminfraredspectroscopy(FTIR),1H-NMR,andUV-Vis-NIRspectra.Transmissionelectronmicroscope(TEM)analysisforPAPDMAABEindicatesthatpartofPAPDMAABEisincrystalstate,duetotheshort-rangeorderofthepolymer.Thermogravimetricanalysis(TGA)curveshowsthatthepolymerhasgoodthermalstabilityanditsdecompositiontemperatureis248℃.TheopticalbandgapofPAPDMAABEobtainedfromtheopticalabsorptionspectrumisabout1.73eV.Theresonantthird-ordernonlinearopticalpropertyofPAPDMAABEat532nmwasstudiedusingdegeneratefour-wavemixing(DFWM)technique.Theresonantthird-ordernonlinearopticalsusceptibilityofthepolymerisabout7.48×10-8esu.