Penn Physicists Help Show Math Behind Growth of "Coffee Rings"
Physicists Arjun Yodh and D.J. Durian and their groups explore how particles stack up as they reach an evaporating drop's edge. The different particles make smoother or rougher deposition profiles depending on their shape.
Read more about this work in:
APS Physics Forum: http://physics.aps.org/articles/v6/7