Effects of Electrolytes on Properties on Black Films and Foam Stability of Aqueous Nonionic Surfactant Solutions

• Published in: Bulletin of the Chemical Society of Japan Vol. 48; no. 6; pp. 1760 - 1763
• Main Author: Yamanaka, Teruko
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 01.06.1975; Chemical Society of Japan
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.48.1760

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.