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1、weekendingPRL104,128303(2010)PHYSICALREVIEWLETTERS26MARCH2010DryingofComplexSuspensions1,23245LeiXu(徐磊),AlexisBerge`s,PeterJ.Lu(陸述義),Andre´R.Studart,AndrewB.Schofield,672HidekazuOki(沖秀一),SimonDavies,andDavidA.Weitz1DepartmentofPhysics,TheChineseUniversityofHongKong,Shati
2、n,HongKong2DepartmentofPhysicsandSEAS,HarvardUniversity,Cambridge,Massachusetts02138,USA3De´partementdephysique,E´coleNormaleSupe´rieure,75005Paris,France4ComplexMaterials,DepartmentofMaterials,ETHZurich,8093Zurich,Switzerland5TheSchoolofPhysics,UniversityofEdinburgh,Ed
3、inburghEH93JZ,UnitedKingdom6Shinagawa-ku,141-0032Tokyo,Japan7AkzoNobelCorporate,R320WiltonCentre,RedcarTS104RF,UnitedKingdom(Received29July2009;published24March2010)Weinvestigatethe3Dstructureanddryingdynamicsofcomplexmixturesofemulsiondropletsandcolloidalparticles,usin
4、gconfocalmicroscopy.Airinvadesandrapidlycollapseslargeemulsiondroplets,forcingtheircontentsintothesurroundingporousparticlepackatarateproportionaltothesquareofthedropletradius.Bycontrast,smalldropletsdonotcollapse,butremainintactandaremerelydeformed.Asimplemodelcoupling
5、theLaplacepressuretoDarcyslawcorrectlyestimatesboththethresholdradiusseparatingthesetwobehaviors,andtherateoflarge-dropletevacuation.Finally,weusethesesystemstomakenovelhierarchicalstructures.DOI:10.1103/PhysRevLett.104.128303PACSnumbers:47.57.s,47.55.N,47.56.+rThedry
6、ingofsuspensionsofcolloidalparticlesgiveslidifiedpack,throughoutwhichemulsiondropsaredis-risetoaplethoraoffascinatingphenomena,fromthepersed;afrontofairthenpassesthroughtheentiresystem.coffee-ringeffect[1]toepisodiccrackpropogation[2]Whenthisdryingfrontreacheslargeemulsi
7、ondroplets,theandthefractalpatternsarisingfrominvasionpercolationdropletsunexpectedlycollapseandtheirinternalcontents[3].Dryingofcolloidalsuspensionsisalsoimportantareforcedintotheporespacebetweenthesurroundingtechnologically:paintsandothercoatingsdependoncol-colloids,d
8、rivenbyanimbalanceofpressuresatthedrop-loidalparticlesformanyoftheirkeyproperties,manyletsinterfaceswithairand
