Capillary force repels coffee-ring effect
SCIE
SCOPUS
- Title
- Capillary force repels coffee-ring effect
- Authors
- Weon, BM; Je, JH
- Date Issued
- 2010-07-26
- Publisher
- AMER PHYSICAL SOC
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12380
- DOI
- 10.1103/PHYSREVE.82.015305
- ISSN
- 1539-3755
- Article Type
- Article
- Citation
- PHYSICAL REVIEW E, vol. 82, no. 1, 2010-07-26
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