Although less common than aqueous-based foam, non-aqueous foam has numerous uses in a broad range of
industries. The vast quantity of work on understanding
foam has been conducted on aqueous systems and many
of the underlying concepts concerning foam generationand stability can be applied to non-aqueous systems. In
both type of systems, high surface viscoelasticity, and
barriers that prevent foam-film rupture promote foam
stability. However, the low gas/liquid surface tension
of non-aqueous systems limits adsorption to their gas/
liquid interface and reduces the possibility of generating
stable foam films. Certain specialty surfactants have
been found to provide stable oil-based foam, and parti-cles having adequate wetting properties can adsorb to
the interface and block foam-film rupture. Furthermore,
binary liquid systems and multi-phase condensed media
have proven to be effective in stabilizing non-aqueous-based foam. Extended these principles to different types
of non-aqueous fluids will surely lead to new foaming
systems and applications.
Although less common than aqueous-based foam, non-aqueous foam has numerous uses in a broad range of
industries. The vast quantity of work on understanding
foam has been conducted on aqueous systems and many
of the underlying concepts concerning foam generationand stability can be applied to non-aqueous systems. In
both type of systems, high surface viscoelasticity, and
barriers that prevent foam-film rupture promote foam
stability. However, the low gas/liquid surface tension
of non-aqueous systems limits adsorption to their gas/
liquid interface and reduces the possibility of generating
stable foam films. Certain specialty surfactants have
been found to provide stable oil-based foam, and parti-cles having adequate wetting properties can adsorb to
the interface and block foam-film rupture. Furthermore,
binary liquid systems and multi-phase condensed media
have proven to be effective in stabilizing non-aqueous-based foam. Extended these principles to different types
of non-aqueous fluids will surely lead to new foaming
systems and applications.
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