Thermal insulators from frozen aqueous foams

Thermal insulators from frozen aqueous foams 

In order to design a composition of foaming agents and to select the optimum technological parameters for frozen foam production and deposition on soils, the stability of foams from various foaming agents has been studied [115]. Focused were the internal foam 

The study of the foam lifetime versus concentration for the widely used foaming agents Volgonate (at Ap = 10 kPa) indicates that foam stability decreases visibly at concentrations less than 0.1%. The rate of diffusion bubble expansion gradually decreases, starting from concentrations -1%. Additional rise in foam stability is obtained with addition of various additives (electrolytes, water soluble polymers, fatty alcohols, etc.). 

Initial size of gas bubbles and the lifetime of a foam from 2% solutions of various surfactants. 

NP20 sulphates sulphonates benzene- Volgonate methyl-diethyl- 

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Thermal insulators from frozen aqueous foams... 

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