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1、Anal.Chem.2009,81,23032310ParticleTrappinginHigh-ConductivityMediawithElectrothermallyEnhancedNegativeDielectrophoresisSeungkyungPark,MehtiKoklu,andAliBeskok*AerospaceEngineeringDepartment,OldDominionUniversity,Norfolk,Virginia23529Wedemonstratenegati
2、vedielectrophoresis(DEP)trap-Activecontrolofcolloidalmotioncanbeachievedthroughthepingofparticlesfromhigh-conductivitymediausingaapplicationofavarietyofphysicalforces,includingmechanical,4novelplanarmicroelectrodethatallowselectrothermal?uidic,optical
3、,acoustic,electrokinetic,andelectromagnetic.enhancementofDEPtraps.DEPforceandelectrothermalAmongtheseforces,dielectrophoresis(DEP)hasseveraladvan-?owmotionareinvestigatedusingascalinganalysis,tagessuchasremotemanipulationofparticlesbyelectric?eldnumer
4、icalsimulations,andexperiments.Resultsshowcontrolandsimplecon?gurationofdeviceswithoutmechanical5thattheDEPtrappingisenhancedbylateraltransportofmovingcomponents.DEPisthemotionofpolarizableparticlesparticlestowardthecapturezonesduetoelectrothermalthat
5、aresuspendedinanionicsolutionandsubjectedtoaspatially?ow,whereasDEPtrappingoccurredonlyinlimitednonuniformelectric?eld.Whenthepolarizabilityoftheparticlesspatialrangeswithoutthe?owmotion.Theelectrother-islargerthanthatofthe?uid,theparticlesmovetowardr
6、egionsmallyenhancedDEPwillbroadenthelimitofelectroki-ofthehighelectric?elddensity(positiveDEP).Ifthe?uidisneticmanipulationsinhigh-conductivitymedia.Bypro-morepolarizablethantheparticles,theparticlesmoveawayfromvidingpatternedtrappingzonesthatcanactas
7、target-thehighelectric?elddensity(negativeDEP).Itispossibletospeci?cattachment/detectionsites,thepresenteddeviceinducefrequency-speci?cvariationsinparticlepolarizabilityusingallowsdevelopmentofbiosensorapplicationsforrapidacelectric?elds,whichfurthere
8、nrichestherealmofDEPdetectionofpathogensandothermicroorganismswithinapplications.apracticalrangeofbufferconductivity.PositiveDEPhasbeenutilizedfortrappingandseparatingcolloidalparticlesbyseveralresearchersusinginterdigitated,grid,6point-and-li
