静电纺丝的原理和应用

ElectrospinningGroupNo.62008-12-27GROUP11CatalogOurintroductionrelateto:HistoryMechanismApplicationTechniqueGROUP11HistoryFormhalsetc.thefirstpatentBecauseofthefilterindustry:conventionalextrusion-and-drawingprocessesNanotechnologypromotion&Publicationexplode1934Mid-1990snowGapGROUP11HistoryThepublicationincreaseGROUP11MechanismpolymersolutionsormeltsGROUP11MainProcess1.Taylorcone2.repulsiveforcesovercomesurfacetension:jet3.radialchargerepulsion:Splitting4.CollectGROUP11JetstudyPIG.Jetimagesofa2wt%solutionofPEO(a)Stablejet(E=0.5kV/cm,Q=4ml/min)(b)Unstablejet(E=0.67kV/cm,Q=0.1ml/min,1msexposure)(c)close-upoftheonsetofinstability(E=0.67kV/cm,Q=0.1ml/min,18nsexposure)envelopeconeY.M.Shinetal.Appl.Phys.Lett.78(2001):1149-1151GROUP11JetStabilityTherearemanyfactorsinfluencejetstabilityTherearetwomainkindsofinstabilities:①Rayleighinstabilityaxisymmetric,suppressedwhenEandσexceedathreshold②Whippinginstabilitynonaxisymmetric,including:electricallydrivenbendinginstabilityaerodynamicallydriveninstabilityGROUP11JetStabilityFIG.Operatingdiagramshowingstabilitytransitionsfora2wt%solutionofPEOinwater.Whiteregion:theoreticalsteadyjet;lightgrayregion:theoreticalRayleighunstable;darkgrayregion:theoreticalwhippingunstable;cross-hatchedregion:theoreticalcomparableinstabilitytoRayleighandwhippingmodes.Circles:experimentaldata.Y.M.Shinetal.Appl.Phys.Lett.78(2001):1149-1151GROUP11BendinginstabilityFIG.Shapeoftheenvelopecone:experimentvstheory.Pointsshowcalculatedradiiofsuccessiveloops.Experimentalpointsweremeasuredfromaphotograph.A.L.Yarinetal.J.Appl.Phys.89(2001):3018-3026GROUP11FocusingApparatusLeonM.BellanaandH.G.CraigheadJ.Vac.Sci.Technol.B24(2006):3179-3183GROUP11Variables&ParameterelectricalfieldStrength;fluidflowrate;workingdistancebetweentheelectrodesprocessvariablesViscosity;Electricalconductivity;surfacetension;solventvolatility;SolutionvariablesTemperaturePressureHumidityEnvironmentalvariablesGROUP11ProcessVariablesJ.M.Deitzeletal.Polymer42(2001):261-272GROUP11ProcessVariablesJ.M.Deitzeletal.Polymer42(2001):261-272GROUP11ProcessVariablesJ.M.Deitzeletal.Polymer42(2001):261-272GROUP11entanglementconcentration(Ce)SolutionVariablesη0zeroshearrateviscosityηsthesolventviscosityηspspecificviscosityGROUP11MorphologywithCeMatthewG.McKeeetal.Macromolecules,37(2004):1760-1767GROUP11DiameterwithCeGROUP11entanglementnumber(ne)solnAnotherSolutionΦpPolymervolumefractionMwWeight-averagemolecularweightMeEntanglementmolecularweightinthemelt(Me)solEntanglementmolecularweightinthesolutionS.L.Shenoyetal.Polymer46(2005):3372–3384GROUP11EffectofHumidityEnvironmentalVariablesPS/THFfiberselectrospunundervaryinghumidity:(a)25%,(b)31-38%,(c)40-45%,(d)50-59%,(e)60-72%.Macromolecules2004,37,573-578CherylL.Casperetal.TheconceptofbreathfiguresGROUP11AssemblyTechnique(1)1070rpmATheronetal.Nanotechnology12(2001):384–390GROUP11GROUP11AssemblyTechnique(2)DanLietal.Adv.Mater.16(2004):361-366GROUP11AssemblyTechnique(3)GROUP11DamingZhangandJiangChanginSICCASAdv.Mater.19(2007):3664-3667protrusionsGROUP11GROUP11time-dependentarrangementofthepatternedprotrusionsGROUP11Hollow&core-shellnanofibersfabricatedbyelectrospinningAssemblyTechnique(4)①Twocoaxialcapillaries②DepositanddissolveOrganicfiberdepositdissolveGROUP11③ElectrospunbyemulsionDrugsolutionPEO-FITC/PEG-LLEA/SDSPolymerdrugmixtureDrugemulsionGROUP11NewelectrospunmethodA.L.YarinandE.ZussmanPolymer45(2004):2977–2980UpwardneedlelesselectrospinningGROUP11Science’sopiniontoelectrospinningGROUP11Science’sopiniontoelectrospinningGROUP11Science’sopiniontoelectrospinningGROUP11Nanofiber-reinforcedcompositesNanofiber-basedmembranesandsmartclothesBiomedicalusage:especiallyfortissuescaffold,drugdeliveryNanofiber-basedsupportsforenzymesandcatalystsNanofiber-basedsensorsNanofiber-basedelectrodematerialNanofiber-basedelectronicandopticaldevicesNanofibersassacrificialtemplatesApplicationConclusionGROUP11TeamworkersSC07014026崔忠慧SC07014027丁尚军SC07014036解俊杰SC07014038梁宵SC07014039刘大安SC07014064张郡凌GROUP11HappyNewYear!