光誘導介電泳驅(qū)動下微米粒子動力學數(shù)值模擬.pdf

1、東南大學碩士學位論文光誘導介電泳驅(qū)動下微米粒子動力學數(shù)值模擬姓名：尹芝峰申請學位級別：碩士專業(yè)：機械工程；機械制造及其自動化指導教師：倪中華20110526ABSTRACTABSTRACTLabon—achiptechnologyisusuallyutilizedforparticles’transportation，collecting，separationanddetectionAsakindofimportanttechonolg

2、yformanipulatingandanalyzingparticles，lightinduceddielectrophoresis(LIDEP)hasboththeadvantageofdielectrophoresis(noncontactandnondestructive)andtheadvantageofopticaltweezertechonolgy(flexibleandcontrollable)andisgraduall

3、ybeingappliedtolabonachip，becomingahotspotintheareaofparticlemanipulationtechonologyNumericalSimulationonparticles’UDEPisanimportanttoolforexploringandimprovingLIDEPbemuseofthecomplexprocessandthehighcostofexperimentaleq

4、uipmentsAsaresult，findingallaccurateandefficientnumericalsimulationmethodisthekeypointanddiffcultyInthispaperanumericalsimulationmethod(MDFEM)combiningmoleculardynamics(MD)simulationandfiniteelementmethod(FEM)isintroduce

5、dtosimulateLIDEPofmicronparticlesandoptimizeoflightinducedringelectrodes’parametersFirstlyforces，suchasdielectrophoresisforce，electrostaticforce，fluidicforceetc，ofmicrocolloidsunderseveralfieldsareanalyzedandnumericalmod

6、elcharacterizingparticles’movementsisbuiltinthispaper；nextlyFEMmodelisbuiltbasedonLIDEPstructureandthegeneralprocessofMD—FEMsimulationmethodisgivencombiningMDSecondlythecomponentsandprincipleofLIDEPplatformaswellasproces

7、sing，physicalmodelandequivalentcircuitofthechiparedicussed；particles’capturingtransportationandcollectingarealsoachievedbasedontheplatformandringelectrodesThirdlytheparticles’distributionbeforeandaftertheinputofsignaland

8、virtualelectrodesaresimulatedbyMD—FEMAtthesametime，theeffectonpartilces’movementscausedbymicroforcesandtheprincipleof“pearlchains”areanalyzedandMDFEMsimulationmethodisverifiedbycorrespondingexperimentsFinallythemotionofp

9、olystyrenebeadscapturedbyringelectrodeswithdifferentparametersissimulatedbasedonMDFEMandcomparedwithexperimentsontheplatformTheeffectonequilibrationtimeforcapaturingparticlecausedbyelectrodes’dimension，voltageandhalothic

10、knessarealsoanalyzedThesimulationresultsindicatethatnegativedielectrophoresishappenswhenpolystyrenebeads(R=5am)affectedbythesignal(1MHz，20Vpp)andringelectrodesandthebeadsbothinsideandoutsidetheringaredistributedincentral

11、symmetryWhentheelectrode’Sinnerradiusincreasesform35∥mto55gm，theaveragedistancebetweenparticleandringcenterafterequilibration(ADPC)increasesabout137加1landtheequilibrationtimeincreasesabout306sWhiletheinnerradiusislesstha

12、n3毗m，particlespileupWhentheelectrod’Sthicknessincreasesfiom10／zmto30“m，ADPCdecreasesslightlyandtheequilibrationtimeincreasessightlyIncreasingthesignalvoltageanddecreasingthethicknessofopticaltransitionareacanimproveparti

13、cles’positioningequilibriumefficiencyGaussianfunctionismoresuitableforsimulatingopticaltransitionareathanstepfunctionandlinearfunctionAtthesametime，correspondingexperimentssuggestthatthereleativeerrorbetweensimulationdat