Film Elasticity and Film Stabilization in Firefighting Foam Stabilized by Solid Particles

Abstract:

The structure of the thin liquid films determines the stability of foams and emulsions. In this work the bubbles stretched length with different hollow SiO₂ particles concentration is measured when the foam has been stilled for different time. The results show that the bubbles stretched length is longer than that of bubbles when the foam is free of hollow SiO₂ particles even when the foam has been stilled for 500mins. The bubbles stretched length increases with increasing the concentration of hollow SiO₂ particles. A strong hydration effect leaves a large volume of hydration layers on the solid particles surfaces in aqueous solutions. The water in hydration layers can help the film keep a certain thickness. The existence of hydration forces leads that two particles cannot be too close each other. The high concentration surfactant limited in the fixed area helps the film keep good elasticity. Therefore the film has a long life time with compatible thickness and elasticity and the three-phrase foam is upper stable.

• Periodical: Key Engineering Materials (Volume 744)
• Pages: 346-349
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.744.346
• Online since: July 2017
• Authors: Xiu Juan Li, Rui Song Guo*, Min Zhao
• Keywords: Elasticity, Film, Particle, Stability, Three-Phase Foam

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