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Penn Physicists Help Show Math Behind Growth of "Coffee Rings"


January 18, 2013

slightly stretched particles Last year, a team of University of Pennsylvania physicists showed how to undo the "coffee-ring effect," a commonplace occurrence when drops of liquid with suspended particles dry, leaving a ring-shaped stain at the drop's edges. Now the team is exploring how those particles stack up as they reach the drop's edge, and they discovered that different particles make smoother or rougher deposition profiles at the drop edge, depending on their shape. Full Story

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University of Pennsylvania

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