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SUMMARY:MechE Colloquium: Friction: from building the pyramids to the anat
 omy of individual contacts at the nanoscale
DTSTART:20180313T121500
DTEND:20180313T131500
DTSTAMP:20260527T103220Z
UID:161d97edf82bd7d87e7b98325a706798443f3efd0765ecdab7f989ea
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Daniel Bonn\, Director of van der Waals-Zeeman Institute
 \, University of Amsterdam\nAbstract:\nI will discuss the rheology and mec
 hanical properties of wet granular materials\, and show why the behavior c
 an be very subtle. Once one understands the mechanical properties\, I will
  show that one can use this knowledge to construct the perfect sandcastle 
 or to understand why the ancient Egyptians wetted the desert sand with wat
 er before sliding heavy stones over it (Figure).\n\nI will then go on to s
 how some new results on friction at the microscopic scale\, between 2 grai
 ns. Amonton’s famous friction law states that the friction force is prop
 ortional to the normal force since both are proportional to the area of co
 ntact. However\, for spherical grains\, the contact area is not proportion
 al to the normal force\, as shown by Hertz long ago. We use a new fluoresc
 ence technique that allows us to probe the real area of contact between 2 
 rough surfaces. In our case\, we conclude that important deviations from A
 monton’s law are observed.\n\nBio:\nDaniel Bonn is director of the van d
 er Waals-Zeeman Institute of the University of Amsterdam. He is also group
  leader of the Soft Matter Group\, which  totals about 30 people. Before 
 coming to Amsterdam recently\, he was a CNRS research director at the Ecol
 e Normale Supérieure in Paris\, where he led the ‘complex fluids’ gro
 up. He published more than 250 papers on wetting\, complex fluids\, hydrod
 ynamics and mechanics. In the past few years\, he developed a large amount
  of industrial collaborations such as with Michelin\, SKF and Unilever\, S
 hell\,  DSM\, Akzo Nobel\, ASML etc. Bonn is also co-founder of the start
 up company GreenA that just received a Round A investment from a venture c
 apital firm.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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