Journal
PHYSICAL REVIEW E
Volume 82, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.82.015305
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Funding
- Creative Research Initiatives (Functional X-ray Imaging) of MEST/NRF
- National Research Foundation of Korea [2006-0050683] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 the capillary force and the reverse motion. Our findings of reversal phenomena would be important in many scenarios of drying colloidal fluids.
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