Adsorption Behavior and Dilational Rheology of the Cationic Alkyl Trimethylammonium Bromides at the Water/Air Interface

Abstract

The dynamic and equilibrium surface tensions of C(n)TAB solutions for n = 12, 14, and 16 are studied using ring and bubble pressure tensiometry. Together with respective literature values, including neutron reflectivity and dilational surface rheology measurements, the experimental data are analyzed on the basis of two theoretical models, the Frumkin model and a modified reorientation model that takes into account an intrinsic compressibility of adsorbed surfactant molecules. It turns out that this new reorientation model, earlier applied to nonionic surfactant adsorption layers, is also applicable to ionic surfactants and superior to the Frumkin isotherm. All adsorption properties of one particular surfactant can be described by a single set of model parameters.

Effect of polyelectrolytes on (de)stability of liquid foam films

“…C n TAB. 30,31 As our knowledge a comparison between surface rheology data of different surfactant systems and their impact on foam lm stability is still missing. It is even more complex for surface rheology data of polymer-surfactant mixtures.…”

The study of the foaming ability of some surfactants

“…The ability to absorption at the interphase boundary and aggregation in the bulk solution is significant for each surfactant [6,7]. Adsorbing at interfaces and forming micelles the surfactants contribute to dissolution, emulsification, foaming and some other processes that occur in solutions [4].Along with the surface activity of the surfactant itself, the foaming ability of a surfactant is characterized by the mechanical strength and viscosity of the films formed [2,4,6].Methods for determining the ability of the foaming ability can be divided into static and dynamic although this division is rather conventional; and taking into account the equipment used in the studies in some cases there is no difference between these methods [5,6]. Determination by dynamic methods is carried out under continuous mechanical action on the solution to prevent the possibility of running off the foam from it [3,5].…”

“…The ability to absorption at the interphase boundary and aggregation in the bulk solution is significant for each surfactant [6,7]. Adsorbing at interfaces and forming micelles the surfactants contribute to dissolution, emulsification, foaming and some other processes that occur in solutions [4].…”

“…Methods for determining the ability of the foaming ability can be divided into static and dynamic although this division is rather conventional; and taking into account the equipment used in the studies in some cases there is no difference between these methods [5,6]. Determination by dynamic methods is carried out under continuous mechanical action on the solution to prevent the possibility of running off the foam from it [3,5].…”

“…Along with the surface activity of the surfactant itself, the foaming ability of a surfactant is characterized by the mechanical strength and viscosity of the films formed [2,4,6].…”