1975 Volume 48 Issue 6 Pages 1760-1763
The properties of black film, the surface tension of solution and the foam stability in the aqueous solutions of polyoxyethylene-type nonionic surfactants containing various electrolytes were studied. The additional tension \barΔ of black films showed a maximum and a minimum in the concentration range of electrolytes of 1×10−5–1 N. The concentration at this minimum shifted in accordance with the lyotropic series of anions. The surface tension was unaffected by the electrolyte of the concentration less than about 1×10−2 N, whereas \barΔ exhibited a maximum in this range. The overall rate of growth of the black film was found to be proportional to \barΔ over a wide range of electrolyte concentration. The effects of electrolytes on the foam stability were discussed being based upon the properties of the black films.
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