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SUMMARY:Can bubble interactions in foams accurately be described by a pote
 ntial? - Hhler\, R (Pierre et Marie Curie\, Institut des Nanosciences de P
 aris\, Paris-Est)
DTSTART:20140228T093000Z
DTEND:20140228T101500Z
UID:TALK51151@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Elastic interactions between neighboring bubbles in a foam are
  of fundamental importance for the rheological behavior and osmotic pressu
 re of this material (1\,2). In many recent simulations these interactions 
 have been modeled by a potential\, depending on the distance between neigh
 boring bubble centers. Previous surface evolver studies and experiments st
 rongly suggest that this potential is anharmonic\, depending on local pack
 ing topology (2\,3). In contrast\, a recent confocal microscopy study of e
 mulsions concludes that the potential should to a good approximation be ha
 rmonic (4). We compare new 3D Surface Evolver simulations of wet foams to 
 these various previous results and discuss to what extent bubble interacti
 ons are accurately represented in terms of a potential. We also discuss on
  this basis how osmotic pressure and capillary pressure in foams scale wit
 h liquid fraction in the vicinity of the jamming transition. \n\n(1) M. Le
  Merrer\, S. Cohen-Addad\, R. Hohler\, PRL 2012. Cohen-Addad\, Hohler\, Pi
 tois\, Annual Review of Fluid Mechanics 2013. (2) A. Maestro\, W. Drenckha
 n\, E. Rio\, R. Hohler\, Soft Matter\, 2013. Hohler\,Cheung Sang\, Lorence
 au\, Cohen-Addad\, Langmuir 2008 (3) Mason et al PRE 1997 (4) Jorjadze\, P
 ontani\, Brujic PRL 2013 \n
LOCATION:Seminar Room 1\, Newton Institute
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