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Effect of foam films on gas diffusion
P Nguyen Quoc1, Pacelli L J Zitha, Peter K Currie
1Department of Applied Earth Sciences, Delft University of Technology, Mijnbouwstraat 120, Delft, 2628 RX, The Netherlands.
Journal of Colloid and Interface Science
|November 18, 2005
Summary
We investigated gas permeability through soap films, finding it decreases with more films due to cumulative resistance. Our model explains this, considering gas solubility and salinity effects.
Area of Science:
- Physical Chemistry
- Colloid Science
- Materials Science
Background:
- Foams in porous media involve complex lamellar arrangements.
- Understanding gas diffusion through soap films is crucial for foam-based applications.
- Previous models often overlook gas solubility and salinity effects.
Purpose of the Study:
- To experimentally determine gas permeability through single and multiple soap films.
- To investigate the influence of film number and surfactant concentration on permeability.
- To develop a phenomenological model for gas diffusion across soap films.
Main Methods:
- Experimental setup with a straight tube containing freely standing soap films.
- Two novel methods for gas diffusion flux determination: pH changes (NH3) and mass spectrometry (argon).
- Fabrication of soap films using sodium dodecyl sulfate solutions.
Main Results:
- Single film permeability: 3.50±0.04 x 10⁻² cm/s (argon), 3.18±0.07 x 10⁻⁴ cm/s (NH3).
- Permeability significantly decreases with an increasing number of films.
- Model predicts sharp permeability decrease with higher surfactant concentration due to adsorption.
Conclusions:
- Soap film systems offer a simplified model for gas diffusion in porous media foams.
- Cumulative resistance of multiple films significantly impacts overall gas permeability.
- The developed model accurately predicts film permeability, incorporating gas solubility and salinity.