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SUMMARY:IGM Colloquium: Friction: from building the pyramids to the anatom
 y of individual contacts at the nanoscale
DTSTART:20180313T121500
DTEND:20180313T131500
DTSTAMP:20260609T210825Z
UID:c62e2e08f19c6ce33d788b1d258290c3612c86e8fd8c42f5a3300a01
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Daniel Bonn\, director of van der Waals-Zeeman Institute
  of the University of Amsterdam\nI will discuss the rheology and mechanica
 l properties of wet granular materials\, and show why the behavior can be 
 very subtle. Once one understands the mechanical properties\, I will show 
 that one can use this knowledge to construct the perfect sandcastle\, or t
 o understand why the ancient Egyptians wetted the desert sand with water b
 efore sliding heavy stones over it (Figure).\nI will then go on to show so
 me new results on friction at the microscopic scale\, between 2 grains. Am
 onton’s famous friction law states that the friction force is proportion
 al to the normal force since both are proportional to the area of contact.
  However for spherical grains\, the contact area is not proportional to th
 e normal force\, as shown by Hertz long ago. We use a new fluorescence tec
 hnique that allows us to probe the real area of contact between 2 rough su
 rfaces. In our case\, we conclude that important deviations from Amonton
 ’s law are observed.\n\nBio:\nDaniel Bonn is director of the van der Waa
 ls-Zeeman Institute of the University of Amsterdam. He is also group leade
 r of the Soft Matter Group\, which  totals about 30 people. Before coming
  to Amsterdam recently\, he was a CNRS research director at the Ecole Norm
 ale Supérieure in Paris\, where he led the ‘complex fluids’ group. He
  published more than 250 papers on wetting\, complex fluids\, hydrodynamic
 s and mechanics. In the past few years\, he developed a large amount of in
 dustrial collaborations such as with Michelin\, SKF and Unilever\, Shell\,
   DSM\, Akzo Nobel\, ASML etc. Bonn is also co-founder of the startup com
 pany GreenA that just received a Round A investment from a venture capital
  firm.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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