Interfacial Properties of a Catanionic Surfactant
Citations Over TimeTop 14% of 1996 papers
Abstract
Interfacial properties of aqueous solutions containing the catanionic surfactant n-hexylammonium n-dodecyl sulfate (AM-DS) are reported. The cmc (1.0 mmol dm-3) and equilibrium surface tensions γeq were measured by DuNouy ring tensiometry. Dynamic surface tensions γ(t) were measured in the range 5 ms to 10 s using the maximum bubble pressure technique. Neutron reflection measurements were used to determine the area per molecule as and the surface excess Γ as a function of concentration, as well as the structure in the monolayer. Data from these experiments were combined to analyze the γ(t) decays in terms of asymptotic solutions to the Ward and Tordai equation. During the initial adsorption period the dynamic surface tensions were all consistent with this diffusion-controlled mechanism. However, toward the end of the process, for concentrations below the cmc, there is some evidence for a weak adsorption barrier. Using measured quantities, the barrier strength was estimated as between 5 and 15 kJ mol-1 at 25 °C.
Related Papers
- → Dependence of the surfactant solutions surface tension on the concentration and on the temperature(2021)10 cited
- → Interfacial Tension Behavior of an Acidified Oil/Surfactant System(1994)12 cited
- Influences of surface tension of acid solution and contact angle of rock on the cleanup efficiency of surfactant(2008)
- → Alveolar Surface Tension and Lung Surfactant(1986)147 cited
- → The Influence of Surfactant Physicochemical Properties on Pulmonary Interfacial Flow Analogues(1997)