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SUMMARY:What keeps sand-castles standing? The physics of wet granular matt
 er - Prof. Stefan Herminghaus\,  MPI for Dynamics and Self-Organization\, 
 Göttingen\, Germany
DTSTART:20100129T140000Z
DTEND:20100129T150000Z
UID:TALK22251@talks.cam.ac.uk
CONTACT:Erika Eiser
DESCRIPTION:Dry granulates\, like the sand that easily runs through the or
 ifice of an hourglass\, behave like fluids in many physical aspects. As so
 me liquid is added\, however\, they transform into a pasty material\, from
  which stable sculptures can be made. It turns out that the physics of thi
 s pasty texture\, which is a consequence of the wettability of the grains 
 and the liquid interfaces spanning between them\, is not as complex as it 
 may seem at first glance. There are certain regularities on the basis of w
 hich we can understand\, for instance\, why the  mechanical properties of 
 wet sand are remarkably independent of the liquid content: nobody needs a 
 recipe for building sand castles! The talk tries to elucidate these regula
 rities and  dwells on  static as well as dynamic aspects of liquid  struct
 ures in wet granular piles.\n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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