Abstract
A tension measuring apparatus for the bubble film was developed and the dynamic property of the bubble film generated from solutions of a nonionic surfactant, polyoxyethylene 9-octadecenyl ether, in the absence and the presence of acid dyes (C. I. Acid Red 134 and Green 25) was studied. The apparatus enables the measurement of the dynamic property of the liquid film in the bubble form with separating of the elastic and viscous contribution. Surfactant molecules are preferentially adsorbed to the interface that is newly formed by the extension of the bubble film. In the semi-static condition, however, the existance of the adsorption of C. I. Acid Red 134, with large hydrophobic moiety, on gas-liquid interface is undeniable. In the system that contains surfactant in such a large excess as occurring the large micelle formation, dynamic property of the foam film is not affected by the addition of acid dyes.
