兰大纳米化学教学文案.ppt

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1、兰大纳米化学3.Whyinterfacesareimportant?Answer:Thepropertiesofcandeterminedthefunctionandtheextrinsicpropertiesofamaterials.Wecanchangethematerials’functionbychangethepropertiesoftheinterfaces.Themoleculebetweentheinnerandtheinterfaceareunderdifferentforce

2、,whichcausetheinterfacemoleculehavespecialpropertiesthanthesidemolecule.4.Whichisbetterinself-assembly:noncovalentorcovalentbonding?Answer:Ithinkthenoncovalentbondingisbetter,becausethenoncovalenteffectismorereversible,thatcanmakethemoleculecombinedo

3、ntheirown,andgetalowerenergy,theyaremorestable,besidestheycanalsohaveself-healing.Butwhenusingcovalentbonding,oncehavingrandomerror,itismoredifficulttorepairandveryhardtogetthelowestenergy.5.WhatistheadvantagesofSAMSovertheothermolecularassemblysyste

4、ms,suchasLBfilmsandliquidcrystals?Answer:SAMScanusetoimprovethematerial’ssurfacefunctionsuchasapplyingtoreducefriction,anti-wearandsoon.SAMShastheadvantagesofhighorderandorientation,highdensity,lowstructurefaultandstability.SAMScanadapttoavarietyofsu

5、rfacesandalsocanchangethetypeofchaintoachievedifferentkindsofeffect.6.Imagewhatyoucoulddowithchemicalpatterns?Answer:Itisusedfortheimmobilizationofenzyme,andtheenzymemoleculeismodifiedonthecarrier.Thesurfacemodificationofmedicalmaterials,suchastheuse

6、ofheparintoimprovetheirbiocompatibilityinvivo7.Whataretheuniquepropertiesofcarbonnanotubes?Answer:Carbonnanotubesaregenerallyregardedasthesinglehardestmaterialsknowntoman.Asinglewallednanotubeisabletowithstandapressurethatamountsto24GPaNanotubesareal

7、soknowntohavekineticpropertiesthatmakethemgetnestedwitheachother.Thereisanoutstandingtelescopingpropertythattheytendtodisplaywithtimeandthisusuallyinvolvesslidingoftheinnercorenanotube.Thisslidingoccurswithverylittleornofrictionatallandusuallyleadsto

8、rotationalbearing.Thenanotubestructureusuallyhasaneffectontheelectricalpropertiesofgrapheneowingtoitselectronicstructurethatisquiteunique.Somesuperconductivitypropertieshavealsobeenregisteredwithsomeofthesenanotubesandalthoughthereareseveralotherexp