Granular matter is often taken to be part of the class of soft matter
systems whose mechanical properties are well described by the jamming
paradigm. However, emulsions, foams, and colloids are in a first
approximation frictionless spheres. This differs for most granular
materials like sand, snow, salt or sugar; they are not comprised of
spherical particles and definitely possess surface friction.
This talk will discuss in which way granular matter deviates from the
classical jamming paradigm. X-ray tomography (in-house and at the ESRF
synchrotron in Grenoble) allows us to measure the geometrical properties
of packings o frictional spheres and tetrahedra and relate those to
mechanical properties like mechanical stability and dilatancy onset.
About the speaker: http://www.dcf.ds.mpg.de/index.php?id=schroeter&L=3