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Ostwald ripening of aqueous microbubble solutions
Sota Inoue1, Yasuyuki Kimura1, Yuki Uematsu2
1Department of Physics, Kyushu University, Fukuoka 819-0395, Japan.
The Journal of Chemical Physics
|December 31, 2022
Summary
This study investigates microbubble stability, finding their size distribution is time-independent. Bubble radius changes follow Ostwald ripening theory, aligning with experimental data and LSW theory predictions.
Area of Science:
- Physical Chemistry
- Colloid Science
- Fluid Dynamics
Background:
- Bubble solutions have diverse applications in cleaning, water treatment, and agriculture.
- Understanding bubble stability and interfacial charge is crucial but incomplete.
- Physicochemical properties of microbubbles require further investigation.
Purpose of the Study:
- To experimentally investigate the kinetics of radii in aqueous microbubble solutions.
- To analyze bubble radius dynamics in the context of Ostwald ripening.
- To validate theoretical models like Lifshitz-Slezov-Wagner (LSW) theory with experimental data.
Main Methods:
- Experimental investigation of microbubble radii kinetics.
- Image analysis to track individual bubble growth and shrinkage.
- Comparison of experimental data with Ostwald ripening and LSW theories.
Main Results:
- Bubble radii distributions, scaled by mean radius and total number, were time-independent.
- Bubble radius evolution is governed by diffusion-limited Ostwald ripening.
- Experimental coefficients align quantitatively with LSW theory, with slight deviations explained by finite volume fraction.
Conclusions:
- The study confirms Ostwald ripening as the dominant mechanism for microbubble radius kinetics.
- LSW theory accurately predicts microbubble behavior, with minor adjustments for finite volume effects.
- Detailed analysis of shrinkage dynamics in small microbubbles provides new insights.
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