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SUMMARY:Some problems concerning the dynamics of interfaces: (i) Marangoni
  motions of soluble surfactants and (ii) Bubble bursting at a compound int
 erface - Howard Stone\, Princeton University
DTSTART:20140521T120000Z
DTEND:20140521T130000Z
UID:TALK52229@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:Interfaces control many aspects of the thermodynamics and\ndyn
 amics of multiphase materials. Not surprisingly\, questions about the\ndyn
 amics of interfaces\, e.g. their flow and response to forces\, occur in\nc
 olloid science\, fluid mechanics and other areas of science and\nengineeri
 ng. In this talk we describe two distinct problems that we have\nstudied w
 here interfaces control the mechanical response of the system.\nFirst\, we
  describe an experiment where the degree of miscibility of an\namphiphile 
 controls the area over which a surface-tension-driven flow is observed at 
 the interface of water and air. We report universal features of the surfac
 e velocity distribution and identify a scaling law for the area over which
  the flow is observed.  An analytical description is offered for some of t
 hese observations. Second\, we study bubble bursting at a compound air/oil
 /water-with-surfactant interface and document the hitherto unreported form
 ation and dispersal into the water column of submicrometre oil droplets. W
 e show that dispersal results from the detachment of an oil spray from the
  bottom of the bubble towards water during bubble collapse. Perhaps surpri
 singly\, we provide evidence that the droplet size is selected by physicoc
 hemical interactions between oil molecules and the surfactants rather than
  by hydrodynamic effects.
LOCATION:MR3\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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