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1、LETTERSOptofluidiccontrolusingphotothermalnanoparticlesGANGL.LIU1,2,JAEYOUNKIM1,YULU1ANDLUKEP.LEE1,2*1BiomolecularNanotechnologyCenter,BerkeleySensorandActuatorCenter,DepartmentofBioengineering,UniversityofCaliforniaatBerkeley,Berkeley,California94720,USA2
2、UCSFandUCBJointGraduateGroupinBioengineering,UniversityofCalifornia,SanFrancisco,California94143,USA*e-mail:lplee@berkeley.eduPublishedonline:18December2005;doi:10.1038/nmat1528hotothermalmetallicnanoparticleshaveattractedvapour.Incontrast,theoriginalliqu
3、idcontactlineispinnedand24significantattentionowingtotheirenergy-conversionliquidlostinevaporationisreplenishedfromtheinteriorregion.1–4Pproperties.Here,weintroduceanoptofluidicapplicationThevapourinthecolderaircondensesalmostimmediatelyafterthebasedonadire
4、ctoptical-to-hydrodynamicenergyconversionevaporationanddropletsformveryclosetoorevenincontactwithusingsuspendedphotothermalnanoparticlesneartheliquid–airtheliquid–airinterface.Thedropletsthencoalescewitheachotherinterface.Usinglightbeamswithsubmilliwattpo
5、wer,weandgrowintolargeronesthateventuallymergewiththeoriginalcandriveandguideliquidflowinmicrofluidicchannelstoliquidbodyandextenditscontactline.Previousstudieshaveshown25transportbiomoleculesandlivingcellsatcontrolledspeedsthatthedropletcoalescencecanfacil
6、itateflowsignificantly,andanddirections.Previously,avarietyofmethodsforcontrollingthesurfacewettingbythecoalesceddropletsalsoassiststheadvancemicroscaleliquidflowhavebeendevelopedowingtotheoftheliquid–airinterface.ThePNPsaredrawntowardsthenewincreasingintere
7、stformicrofluidics-basedbiochemicalanalysiscontactlinebecauseoftheliquidmotionandconvection.The5systems.However,ourmethoddispenseswiththeneedforaboveprocessescanoccurrepeatedlyandconcurrently,andthe6–89,10complexpumpandvalvedevices,surfacechemistryandliqui
8、dflowcanbecontinuousifthelightilluminationistranslated11–14electrodepatterning,oranyotherfurtherefforttowardsalongwiththeadvancingliquid–airinterface.15,16substratefabrication.Instead,ouroptofluidiccontrolmethodInanexp
