Dissolution without disappearing

Multicomponent gas exchange for CO 2 bubbles in a microfluidic channel

Suin Shim, Jiandi Wan, Sascha Hilgenfeldt, Prathamesh D. Panchal, Howard A. Stone

Research output: Contribution to journalArticle

Abstract

We studied the dissolution dynamics of CO2 gas bubbles in a microfluidic channel, both experimentally and theoretically. In the experiments, spherical CO2 bubbles in a flow of a solution of sodium dodecyl sulfate (SDS) first shrink rapidly before attaining an equilibrium size. In the rapid dissolution regime, the time to obtain a new equilibrium is 30 ms regardless of SDS concentration, and the equilibrium radius achieved varies with the SDS concentration. To explain the lack of complete dissolution, we interpret the results by considering the effects of other gases (O2, N2) that are already dissolved in the aqueous phase, and we develop a multicomponent dissolution model that includes the effect of surface tension and the liquid pressure drop along the channel. Solutions of the model for a stationary gas bubble show good agreement with the experimental results, which lead to our conclusion that the equilibrium regime is obtained by gas exchange between the bubbles and liquid phase. Also, our observations from experiments and model calculations suggest that SDS molecules on the gas-liquid interface form a diffusion barrier, which controls the dissolution behaviour and the eventual equilibrium radius of the bubble. This journal is

Original languageEnglish (US)
Pages (from-to)2428-2436
Number of pages9
JournalLab on a Chip
Volume14
Issue number14
DOIs
StatePublished - Jul 21 2014

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Microfluidics
Carbon Monoxide
Sodium dodecyl sulfate
Dissolution
Sodium Dodecyl Sulfate
Gases
Bubbles (in fluids)
Liquids
Behavior Control
Surface Tension
Diffusion barriers
Pressure drop
Surface tension
Experiments
Pressure
Molecules

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Chemistry(all)
  • Biomedical Engineering

Cite this

Dissolution without disappearing : Multicomponent gas exchange for CO 2 bubbles in a microfluidic channel. / Shim, Suin; Wan, Jiandi; Hilgenfeldt, Sascha; Panchal, Prathamesh D.; Stone, Howard A.

In: Lab on a Chip, Vol. 14, No. 14, 21.07.2014, p. 2428-2436.

Research output: Contribution to journalArticle

Shim, Suin ; Wan, Jiandi ; Hilgenfeldt, Sascha ; Panchal, Prathamesh D. ; Stone, Howard A. / Dissolution without disappearing : Multicomponent gas exchange for CO 2 bubbles in a microfluidic channel. In: Lab on a Chip. 2014 ; Vol. 14, No. 14. pp. 2428-2436.
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