材料科学与工程专业英语13-unit 19-20 nanostructured materialsppt课件

.,1,材料科学与工程专业英语SpecialEnglishforMaterialsScienceandEngineering,Part4nanostructuredmaterialsUnit19NanotechnologyandnanostructuredmaterialsUnit20creationofnanostructuredmaterials,.,2,WhatisaNanomaterial?,“.materialsstructuredonthesub-100nanometerscale,whichmaybeassembledandorganisedtoyieldnanodevicesandnanosystemsthatpossessneworimprovedproperties.”ICSTIStatementonNanotechnology,.,3,Typesofnanostructuredmaterials,NanoparticlesSpecialnanostructuresNanofilmsnanocomposites,.,4,Propertiesofnanomaterials,Lithography:光刻Etching：刻蚀Semiconductor:半导体Self-organization:自组装Fabrication：构建,thechangesofthechemicalproperties:increaseofthesurfacetovolumeratioThechangesofthephysicalproperties:sizeparameterssmallerthansomecriticallengthwithcertainproperties,.,5,Electric/opticaleffects,DeBrogliewavelength:德布罗意波Discreteenergylevel:能级分裂,DifferentsamplesofCdSenanocrystalsintoluenesolution,.,6,Electric/opticaleffects,Quantumdots：量子点Quantumwell:量子阱Quantumwire:量子线,.,7,Magneticeffects,Ferromagnieticmaterials:铁磁性材料Thermalmotion:热运动Permanentmagnetic:永磁性的Paramagnet：顺磁体Superparamagnetism：超顺磁性Giantmagnetoresistiveeffect:巨磁阻效应,.,8,Mechanicaleffects,Dislocation:位错,L,Frank-Readmechanism,.,9,Unit20Creationofnanostructuredmaterials,.,10,Schematiccomparisonoftop-downandbottom-upapproaches,.,11,Top-downtechniquesBulkmaterialsMechnaicalattrition:机械研磨Ballmilling:球磨Ionimplantation:离子注入ThinfimsMicro/nanostructuringLithography光刻蚀Etching刻蚀,top-downandbottom-upapproaches,.,12,top-downandbottom-upapproaches,Bottoom-uptechniquesBulkmaterialsSol-gel溶胶-凝胶Precipitation沉淀Flamepyrolysis火焰分解Electrodeposition电沉积Clusterassembly/consolidation簇组装/固化ThinfimsSelf-assembly自组装Self-limitaionSelf-alignme