The coffee-drop phenomenon and its time fluctuations: Self-sustained oscillations in colloidal liquids
- Authors: Yakhno T.A.1, Yakhno V.G.1
-
Affiliations:
- Institute of Applied Physics
- Issue: Vol 62, No 3 (2017)
- Pages: 347-354
- Section: Theoretical and Mathematical Physics
- URL: https://journals.rcsi.science/1063-7842/article/view/199030
- DOI: https://doi.org/10.1134/S1063784217030288
- ID: 199030
Cite item
Abstract
The instant coffee model has been taken to study self-sustained oscillations in liquid dispersive media using dynamic self-organization processes in drying droplets that stay sessile on a solid wetted substrate. The width of the formed ring and the dynamics of mechanical properties of the drying sediment and the way they fluctuated over 11 h of the experiment have been measured. Analysis has shown a high degree of correlation between these indicators. This dynamics reflects processes that develop in the examined liquid medium. The possible mechanism of self-sustained oscillations, which is related to the aggregation–disaggregation of the colloidal phase and fluctuations of the interphase tension, has been discussed. The practical significance of this work is that fluctuation processes in liquid dispersive media need to be taken into account as a natural source of systematic measurement error.
About the authors
T. A. Yakhno
Institute of Applied Physics
Author for correspondence.
Email: yakhta13@gmail.com
Russian Federation, Nizhny Novgorod, 603950
V. G. Yakhno
Institute of Applied Physics
Email: yakhta13@gmail.com
Russian Federation, Nizhny Novgorod, 603950