Journal ArticleDOI
Thermodynamics of Ionic Surfactant Adsorption with Account for the Counterion Binding: Effect of Salts of Various Valency
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In this paper, the effect of counterion binding on the surface tension and surface potential of ionic surfactant solutions is accounted for theoretically, and a formalism which enables one to obtain the counterion adsorption isotherm corresponding to a given surface activations is presented.Abstract:
The effect of counterion binding on the surface tension and surface potential of ionic surfactant solutions is accounted for theoretically. It turns out that no every couple of surfactant and counterion adsorption isotherms are thermodynamically compatible. To solve the problem, we develop a formalism which enables one to obtain the counterion adsorption isotherm corresponding to a given surfactant adsorption isotherm. Further, these adsorption isotherms are integrated to obtain the respective expression for the surface tension. The results are extended to the case when the solution contains ionic−nonionic surfactant mixtures and electrolytes of various valency. The integral, which takes into account the electrostatic interactions, is solved analytically for aqueous solutions containing 1:1, 2:1, 1:2, and 2:2 electrolytes. It is demonstrated that the derived equations can be applied to process experimental data for the surface tension as a function of the surfactant and salt concentrations. As a result on...read more
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Colloidal Particles at Liquid Interfaces
TL;DR: Particles at liquid interfaces - an introduction B. P. Binks and T. Horozov, and Theory for interactions between particles in monolayers, a review.
Journal ArticleDOI
Adsorption and surface tension of ionic surfactants at the air–water interface: review and evaluation of equilibrium models
TL;DR: In this paper, a series of old and new equilibrium tension models are reviewed and evaluated for single premicellar ionic surfactants at the air-water interface with or without added salt with a common ion.
Journal ArticleDOI
Disjoining pressure in thin liquid foam and emulsion films—new concepts and perspectives
TL;DR: In this paper, a topical survey of the disjoining pressure in thin liquid foam and emulsion films from both the experimental and the theoretical points of view is presented, focusing on films stabilized by surfactant/polyelectrolyte mixtures.
Journal ArticleDOI
Role of surfactant type and concentration for the mean drop size during emulsification in turbulent flow.
TL;DR: The performed theoretical analysis of drop-drop interactions, in the emulsification equipment, shows that a strong electrostatic repulsion between the colliding drops impedes the drop- drop coalescence in the latter systems, so that smaller emulsion drops are obtained in comparison with the theoretically predicted ones.
Journal ArticleDOI
Mixed Solutions of Anionic and Zwitterionic Surfactant (Betaine): Surface-Tension Isotherms, Adsorption, and Relaxation Kinetics
Krassimir D. Danov,Stefka D. Kralchevska,Peter A. Kralchevsky,Kavssery P. Ananthapadmanabhan,Alex Lips +4 more
TL;DR: Experimental surface-tension isotherms of mixed solutions of two surfactants, sodium dodecyl sulfate (SDS) and cocoamidopropyl betaine (Betaine), measured by means of the Wilhelmy plate method to determine correctly the equilibrium surface tension.
References
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TL;DR: The forces between atoms and molecules are discussed in detail in this article, including the van der Waals forces between surfaces, and the forces between particles and surfaces, as well as their interactions with other forces.
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Surfactants and Interfacial Phenomena
TL;DR: In this paper, the Gibbs equation is used to calculate the area per Molecule at the interface by using the Gibbs Equation (GEE) of the Gibbs equilibrium. But the Gibbs equations are not applicable to surface-active agents.
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Principles of colloid and surface chemistry
Paul C. Hiemenz,Raj Rajagopalan +1 more
TL;DR: Colloid and surface chemistry - scope and variables sedimentation and diffusion and their equilibrium solution thermodynamics - osmotic and Donnan equilibria the rheology of dispersions static and dynamic light scattering and other radiation scattering surface tension and contact angle - application to pure substances adsorption from solution and monolayer formation colloidal structures in surfactant solutions - association colloids adsorction at gas-solid interfaces van der Waals forces the electrical double layer and double-layer interactions electrophoresis and other electrokinetic phenomena electrostatic and polymer-induced
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LI. A contribution to the theory of electrocapillarity
TL;DR: A contribution to the theory of electrocapillarity is given in this paper, where it is shown that the theory can be applied to the field of electrochemysics as well as physics.