Next Article in Journal
Scattering on Quasi-Spherical Black-Holes: Features and Beyond
Next Article in Special Issue
Spontaneous Curvature Induced Stretching-Bending Mode Coupling in Membranes
Previous Article in Journal
Acknowledgment to Reviewers of Physics in 2020
Communication

Emergence of Many Mini-Circles from a Coffee Suspension with Mechanical Rotation

1
Faculty of Life and Medical Sciences, Doshisha University, Tatara, Kyotanabe, Kyoto 610-0394, Japan
2
Center for Integrative Medicine and Physics, Institute for Advanced Study, Kyoto University, Kyoto 606-8501, Japan
*
Authors to whom correspondence should be addressed.
Received: 4 December 2020 / Revised: 12 January 2021 / Accepted: 14 January 2021 / Published: 22 January 2021
(This article belongs to the Special Issue Dedication to Professor Michael Tribelsky: 50 Years in Physics)
Drying of an aqueous suspension containing fine granules leads to the formation of a circular pattern, i.e., the coffee-ring effect. Here, we report the effect of mechanical rotation with drying of an aqueous suspension containing a large amount of granular particles as in the Turkish coffee. It was found that wavy fragmented stripes, or a “waggly pattern”, appear in the early stage of the drying process and a “polka-dot pattern” with many small circles is generated in the late stage. We discuss the mechanism of these patterns in terms of the kinetic effect on micro phase-segregation. We suggest that the waggly pattern is induced through a mechanism similar to spinodal decomposition, whereas polka-dot formation is accompanied by the enhanced segregation of a water-rich phase under mechanical rotation. View Full-Text
Keywords: coffee-ring; micro phase-segregation; transition of drying pattern coffee-ring; micro phase-segregation; transition of drying pattern
Show Figures

Graphical abstract

MDPI and ACS Style

Ueno, H.; Shono, M.; Ogawa, M.; Sadakane, K.; Yoshikawa, K. Emergence of Many Mini-Circles from a Coffee Suspension with Mechanical Rotation. Physics 2021, 3, 8-16. https://0-doi-org.brum.beds.ac.uk/10.3390/physics3010003

AMA Style

Ueno H, Shono M, Ogawa M, Sadakane K, Yoshikawa K. Emergence of Many Mini-Circles from a Coffee Suspension with Mechanical Rotation. Physics. 2021; 3(1):8-16. https://0-doi-org.brum.beds.ac.uk/10.3390/physics3010003

Chicago/Turabian Style

Ueno, Hiroshi, Mayu Shono, Momoko Ogawa, Koichiro Sadakane, and Kenichi Yoshikawa. 2021. "Emergence of Many Mini-Circles from a Coffee Suspension with Mechanical Rotation" Physics 3, no. 1: 8-16. https://0-doi-org.brum.beds.ac.uk/10.3390/physics3010003

Find Other Styles

Article Access Map by Country/Region

1
Back to TopTop