Growth dynamics of microbubbles on microcavity arrays by solvent exchange: Experiments and numerical simulations

Peng, S, Spandan, V, Verzicco, R, Lohse, D and Zhang, X 2018, 'Growth dynamics of microbubbles on microcavity arrays by solvent exchange: Experiments and numerical simulations', Journal of Colloid and Interface Science, vol. 532, pp. 103-111.


Document type: Journal Article
Collection: Journal Articles

Title Growth dynamics of microbubbles on microcavity arrays by solvent exchange: Experiments and numerical simulations
Author(s) Peng, S
Spandan, V
Verzicco, R
Lohse, D
Zhang, X
Year 2018
Journal name Journal of Colloid and Interface Science
Volume number 532
Start page 103
End page 111
Total pages 9
Publisher Academic Press
Abstract Solvent exchange is a flow process to induce a transient oversaturation for forming nanobubbles or nanodroplets on solid surfaces by displacing the solution of gases or droplet liquids with a controlled flow of a poor solvent. In this work, we experimentally and numerically investigate the effect of the flow rate and other control parameters on the formation of microbubbles on hydrophobic cavity arrays during the solvent exchange process. We find that the growth rate, location, and number density of microbubbles are closely related to flow rate, solvent concentration, cavity distance, and spatial arrangement. Higher growth rates and number densities of the bubbles were obtained for faster solvent exchange flow rates. The competition of neighbouring growing bubbles for dissolved gas is greatly alleviated when the inter-cavity distance is increased from 13 µm to 40 µm. The effects of the flow rate and the cavity spacing on the bubble growth are in agreement with the observations from our three-dimensional numerical simulations. The findings reported in this work provide important insight into the formation of multiple interacting surface microbubbles under various flow conditions. The understanding may be extended to a smaller scale for the growth of surface nanobubbles during solvent exchange, which is much harder to visualize in experiments.
Subject Physical Sciences not elsewhere classified
Keyword(s) Growth dynamics
Hydrophobic cavity arrays
Solvent exchange
Surface nanobubbles
DOI - identifier 10.1016/j.jcis.2018.07.111
Copyright notice © 2018 Elsevier Inc. All rights reserved.
ISSN 0021-9797
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