Abstract
Measured lifetimes are reported for air bubbles trapped between insoluble monolayers and the bulk aqueous substrate in a Langmuir-Wilhelmy trough under conditions of constant surface pressure. Results for all films studied, octadecanol and myristic, oleic and gondoic acids, indicate that monolayer collapse is a decisive factor in determining bubble stability. The presence of nascent reservoirs of collapsed film capable of rapid respreading appears responsible for the observed loss of stability. The results also challenge the generally held belief that the stability of evanescent bubbles is directly proportional to the Gibbs elasticity of the monolayer.
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