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Capillary force repels coffee-ring effect
2010
Physical Review E
When a coffee drop dries on a solid surface, it leaves a ringlike deposit along the edge and this is known as the "coffee-ring effect." We find a different motion of particles repelling the coffee-ring effect in drying droplets; the motion of particles that is initially toward the edge by the coffee-ring effect is reversed toward the center by a capillary force. The reversal takes place when the capillary force prevails over the outward coffee-ring flow. We discuss the geometric constraints for
doi:10.1103/physreve.82.015305
pmid:20866682
fatcat:2lzskusqbjazbbolk3ajptfwxe