Foam Stability Study of Dilute Aqueous Nonionic Fluorinated Surfactant Systems

Abstract

Foaming properties of dilute aqueous nonionic fluorinated surfactants, perfluoroalkyl sulfonamide ethoxylate, C₈F1₇SO₂N (C₃H₇)(CH₂CH₂O)_nH (abbreviated as C₈F₁₇EO_n, n = 10, 20) has been studied at 25°C. Both the surfactants produced a large volume of foams that are stable for several hours to a few days depending upon the surfactant concentration. The foam stability increases with increasing the surfactant concentration within the studied surfactant concentration limit. The C₈F₁₇EO₁₀ /water system shows higher foam stability than that of the C₈F₁₇EO₂₀ /water system. The foaming properties of the present systems show good correlation between dynamic surface tension properties and the dilatational surface elasticity.

DOI: 10.3126/jncs.v22i0.522

Journal of Nepal Chemical SocietyVol. 22, 2007 pp. 47-54