Effect of Temperature on the Surface Tension of Soluble and Insoluble Surfactants of Hydrodynamical Importance

Abstract

The effect of temperature on the surface tension of soluble and insoluble surfactants was investigated at an air-water interface. Equilibrium surface tension measurements were performed using the Wilhelmy plate technique in which both temperature and concentration were varied systematically. Insoluble surfactants (oleyl alcohol and hemicyanine) and soluble surfactants (Triton X-100 and sodium dodecyl sulfate (SDS)) were used since they are commonly used in hydrodynamic experiments in which the effects of surfactants on free surface dynamics are studied. The principal result of this investigation is that the surface tension of the above-mentioned surfactants decreases linearly with temperature, independent of concentration, with the exception of oleyl alcohol whose surface tension becomes relatively independent of temperature above 23 °C. The adequacy of standard models for surfactant behavior in describing these data is considered.

Stimuli-Responsive Behavior of PNiPAm Microgels under Interfacial Confinement

“…The change in surface tension with temperature, becomes different when water-soluble surfactants are present. 76 This slope in the surface tension-temperature diagram is characteristic for individual surfactants adsorbed to the air/water interface. 76 While a detailed molecular interpretation of the temperature-dependent interface behavior of linear PNiPAm chains is not within the scope of this article, the temperature-dependent surface pressure may be qualitatively interpreted as a change in the surfactant properties of the PNiPAm due to the change in molecular structure upon collapse.…”

Micellar Aggregation Behavior of Alkylaryl Sulfonate Surfactants for Enhanced Oil Recovery

“…Two factors govern surface tension: the interaction between liquid molecules, and the density difference between gas and liquid phases, and both of these factors are related to temperature. Hence, an increase in temperature weakens the intermolecular attraction, and the difference in density between the two phases is also reduced by the increase in temperature [35,36], resulting in lowering of the surface tension and CMC of aqueous AMS solutions.…”

Controlling negative and positive photothermal migration of centimeter-sized droplets

“…The heating rate is so small that a simulation system almost shows a linear response to the total light intensity. Surface tension values depending on the temperature refer to ones in past studies [32,34,35]. These steps are iterated until the relative error is less than 10 −4 .…”