"Preparation and .. Pltysieoeltentieal Studies of. Cationie and Mixed Surfaetants"

Abstract

A clear understanding of the process of micellization is necessary for rational interpretation of the effect of structural and environmental factors on the value of the critical micelle concentration (CMC). So the determination of thermodynamic parameters of micellization and adsorption has played an important role in developing such an understanding about the behavior of surfactants in their media

Monolayer formation by mixed surfactants system is of theoretical interest and industrial importance. One of the most important aspects of surfactants adsorption air-water interface is its relationship to reduction of surface tension. Monolayer formation affects such important phenomena as contact angle with a solid surface (affecting flotation), rate of wetting of a • solid, and foaming (with applications in enhanced oil recovery or fire extinguishers). Since surfactants used in these applications are rarely single component system, it is important to understand monolayers composed of more than one surfactant (mixed monolayer). Regular solution theory or a first-term Margules expression can be used to model the. thermodynamic nonideality in formation of mixed monolayer.