Abstract
By using the measured values of surface tension in SDBS (sodium dodecylbenzene sulphonate) solutions, the ratio of surface excess of DBS- (dodecylbenzene sulphonate ion) at the liberation of single bubbles from a capillary tube to that in equilibrium was investigated. The effect of both DBS- and the coexisting salts on the ratio was also examined.
Used coexisting salts were NaCI, MgCl2 and AlCl3. The surface tension at the liberation was determined by measurement of the pressure required to liberate bubble from a vertical capillary tube immersed in the test solutions (method of maximum bubble pressure). The surface tension of the solutions in equilibrium was also measured by the Whilhelmy method.
