兰大纳米化学ppt课件

1.Listsomeproductsclaimtobe“nano-product”andgiveyouropinionsaboutwhethertheyarereal“nano”ornot.,Answer:Inmydailylife,mymobilephonemaybecomehotwhenplayinggamesorhavingbatterycharging,soIboughtaheatsinkmadeofnano-material(graphene).Ithinkifthematerialisreallymadeofgraphene,itisareal“nano-product”becauseNano-materials,referstothesizeofitsstructuralunitsbetween1nmto100nmrange.,1,2.Whatdoyouexpecttobenefitfrom“nano-technology”,Answer:Iwanttousethe“nano-technology”tomakemehaveanundyinglife.Whensomeorgansinmybodybecomeweaker,Imayusethe“nano-technology”tochangethemandmakemehaveasoundbodyandlivelong.,2,3.Whyinterfacesareimportant?,Answer:Thepropertiesofcandeterminedthefunctionandtheextrinsicpropertiesofamaterials.Wecanchangethematerialsfunctionbychangethepropertiesoftheinterfaces.Themoleculebetweentheinnerandtheinterfaceareunderdifferentforce,whichcausetheinterfacemoleculehavespecialpropertiesthanthesidemolecule.,3,4.Whichisbetterinself-assembly:noncovalentorcovalentbonding?,Answer:Ithinkthenoncovalentbondingisbetter,becausethenoncovalenteffectismorereversible,thatcanmakethemoleculecombinedontheirown,andgetalowerenergy,theyaremorestable,besidestheycanalsohaveself-healing.Butwhenusingcovalentbonding,oncehavingrandomerror,itismoredifficulttorepairandveryhardtogetthelowestenergy.,4,5.WhatistheadvantagesofSAMSovertheothermolecularassemblysystems,suchasLBfilmsandliquidcrystals?,Answer:SAMScanusetoimprovethematerialssurfacefunctionsuchasapplyingtoreducefriction,anti-wearandsoon.SAMShastheadvantagesofhighorderandorientation,highdensity,lowstructurefaultandstability.SAMScanadapttoavarietyofsurfacesandalsocanchangethetypeofchaintoachievedifferentkindsofeffect.,5,6.Imagewhatyoucoulddowithchemicalpatterns?,Answer:Itisusedfortheimmobilizationofenzyme,andtheenzymemoleculeismodifiedonthecarrier.Thesurfacemodificationofmedicalmaterials,suchastheuseofheparintoimprovetheirbiocompatibilityinvivo,6,7.Whataretheuniquepropertiesofcarbonnanotubes?,Answer:Carbonnanotubesaregenerallyregardedasthesinglehardestmaterialsknowntoman.Asinglewallednanotubeisabletowithstandapressurethatamountsto24GPaNanotubesarealsoknowntohavekineticpropertiesthatmakethemgetnestedwitheachother.Thereisanoutstandingtelescopingpropertythattheytendtodisplaywithtimeandthisusuallyinvolvesslidingoftheinnercorenanotube.Thisslidingoccurswithverylittleornofrictionatallandusuallyleadstorotationalbearing.Thenanotubestructureusuallyhasaneffectontheelectricalpropertiesofgrapheneowingtoitselectronicstructurethatisquiteunique.Somesuperconductivitypropertieshavealsobeenregisteredwithsomeofthesenanotubesandalthoughthereareseveralotherexperimentsthatdisagreewiththisassertion,thesereportscontinuetocreateastiramongexperts.Thethermalpropertiesofcarbonnanotubesarequiteuniquetoobecausethesenanotubesaremostlyexpectedtohavegoodconduction.Ballisticconductionisactuallyapropertythatisshownbythenanotubesastheygoabouttheirthermalconduction.Anothervitalissueinthepropertiesofthesenanotubesistheissueoftoxicity.Whendealingwithnanotechnology,manyexpertshaveraisedseveralquestionsaboutthetoxicityofthenanotubes.Thisstudyandresearchisstillinitsearlystagesandthereisquitealotcriticismstillgoingon.Itisexpectedthatovertheyearstheresultswillhelptogiveexpertsalittlemoreunderstandingofhowthesenanotubesdealwiththequestionoftoxicity.,7,8.WhyresearchersrediscoveredGraphenewasgivenNoblePrize?,Answer:ItsaworthyNobel,forthesimplereasonthatgraphenemaybeoneofthemostpromisingandversatilematerialseverdiscovered.Itcouldholdthekeytoeverythingfromsuper-smallcomputerstohigh-capacitybatteries.Grapheneisstrongerandstifferthandiamond,yetcanbestretchedbyaquarterofitslength,likerubber.Itssurfaceareaisthelargestknownforitsweight.Theenergyapplicationsofgraphenearealsoextraordinarilyrich.Companiescurrentlyusingcarbonnanotubestocreatewearableelectronicsarebeginningtoswitchtographene,whichisthinnerandpotentiallylessexpensivetoproduce.Muchoftheemergingresearchisdevotedtodevisingmorewaystoproducegraphenequickly,cheaplyandinhighquantities.Besides,thegraphenealsohaveotheradvantages.,8,9.Intheabovementionedmethodsforsynthesizingnanopaticles,whichonedoyouprefer?Why?,Answer:Comparedtochemicalmethods,Iprefertousephysicalmethodsbecausetheuseofphysicalmethodscanreducetheoccurrenceofchemicalreactions,thatwillreducepollution,inaddition,thephysicalmethodismoresimplethanchemicalmethods,andeasytocontrol.,9,10.Trydrawanenergybanddiagramofametalandan-typesemiconductor,inwhichillustrate“Valenceband”,”Conductionband”,“Bandgap”and“Fermilevel”,Answer:,10,11.TrydrawaenergydiagramofthedyesensitizedTIO2SolarCell,Answer:,11,12.Whenexcitedbylights,whatwouldhappentothetwonanoparticlesAandB?,Answer:A:Theelectronsontheshellvalencebandareexcitedtotheconductionbandandthentransferredtotheconductionbandofthecore,thecavityoftheshellistransferredtothenuclearvalenceband.B:ThepriceoftheelectronicexcitationtotheconductionbandonShell1,leavingsomeholesinthepriceabove.,12,13.Whatistheadvantagesofcontrolleddrugdeliverysystemscomparedwithconventionalmethods?,Answer:Prolongtheefficacytime,reducethefrequencyofadministrationReducethedamagetothebodyImprovetheutilizationrateofdrugsDrugsarereleasedinspecificlocation,13,14.Ifyouareworkingonbionics,whichbiologi