1999Proc. R. Soc. Lond On the interfacial properties of micrometre-sized water droplets.pdf

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1、Downloadedfromrspa.royalsocietypublishing.orgonApril2,2011Ontheinterfacialpropertiesofmicrometre-sizedwaterdropletsincrudeoilA.Yeung,T.Dabros,J.CzarneckiandJ.MasliyahProc.R.Soc.Lond.A1999455,3709-3723doi:10.1098/rspa.1999.0473EmailalertingserviceReceivefreeemailalertswh

2、ennewarticlescitethisarticle-signupintheboxatthetopright-handcornerofthearticleorclickhereTosubscribetoProc.R.Soc.Lond.Agoto:http://rspa.royalsocietypublishing.org/subscriptionsThisjournalis©1999TheRoyalSocietyDownloadedfromrspa.royalsocietypublishing.orgonApril2,2011On

3、theinterfacialpropertiesofmicrometre-sizedwaterdropletsincrudeoilByA.Yeung1,T.Dabros2,J.Czarnecki1andJ.Masliyah31SyncrudeCanadaLimited,EdmontonResearchCentre,9421-17Avenue,Edmonton,Alberta,CanadaT6N1H42NaturalResourcesCanada,CANMET,1OilPatchDrive,SuiteA202,Devon,Alberta

4、,CanadaT9G1A83DepartmentofChemicalandMaterialsEngineering,UniversityofAlberta,Edmonton,Alberta,CanadaT6G2G6Received11February1999;accepted24February1999Theremarkablestabilityofwater-in-crudeoilemulsionsisduetothepresenceofacomplexadsorbedlayeratthesurfacesofthedispersed

5、droplets.Exceptforitsroleasastericbarrier,littleisknownabouttheinsitupropertiesofthisinterfacialstructure.Inthisstudy,newinsightsintotheadsorbedlayerareprovidedbydirectmicrometre-scalemeasurements.Atlowcrudecontentinthebulkwhere,accordingtointerfacialtensionisotherms,th

6、ereshouldbelittleornosurfactantsonthedropletsurface,theadsorbedlayerdisplayspronouncedrigidityandiscapableofpreventingcoalescenceandcoagulationofthedroplets.SuchinterfacesarehighlydissipativeandcanbewelldescribedbytheBoussinesq–Scrivenmodel.Asthesupplyofsurfaceactivemat

7、erialsinthebulk(i.e.thecrudecontent)increases,theadsorbedlayertransformsfromarigidstructuretoafluidinterface.Thisfluidlayercontinuestoinhibitcoalescence,althoughsignsofweakinterdropletadhesionbegintoappear.Underareacompression,thefluidinterfacewilldischargemicrometre-sized

8、emulsiondropletsintotheoilphaseviaa‘budding’mechanism.Keywords:crudeoil;emulsionstability;interfacialpropertie