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Stability of cellular foam generated from amphoteric surfactant aqueous solution
Kae Fujita1, Tamiya Kishimoto, Kazutaka Nagao
1Department of System Science, Graduate School of Engineering, Okayama University of Science, 1-1, Ridai-cho, Okayama 700-0005, Japan.
Environmental Sciences : an International Journal of Environmental Physiology and Toxicology
|November 11, 2006
Summary
This study explored cellular foam stability using amphoteric surfactants in a bubble column. Foam stability increased with pH, except at neutral conditions (pH 7).
Area of Science:
- Colloid and Surface Science
- Materials Science
Background:
- Cellular foam stability is crucial in various industrial applications.
- Understanding foam behavior in aqueous surfactant solutions is key to controlling its properties.
Purpose of the Study:
- To investigate the stability of cellular foam generated from amphoteric surfactant solutions.
- To determine the effect of pH on foam stability in a bubble column.
Main Methods:
- Experiments were conducted in a standard bubble column.
- The thinning of foam films was analyzed using the Reynolds equation.
- pH levels of the amphoteric surfactant aqueous solution were systematically varied.
Main Results:
- A typical growth and collapse process of cellular foam was observed.
- Foam stability increased with rising pH under both acidic and basic conditions.
- Critical film thickness ranged from 100 to 400 nm.
- Cellular foam was notably absent at pH 7.
Conclusions:
- pH significantly influences the stability of amphoteric surfactant-based cellular foam.
- Optimal foam stability is achieved in non-neutral pH conditions.
- The findings provide insights into foam behavior for potential applications.
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