engleski

Properties of Cationic Surfactants in Pure and Mixed States

The solution properties of the cationic surfactants dodecyl-, tetradecyl-, and hexadecylammonium chloride as well as hexadecyltrimtehylammonium bromide in pure and mixed states have been studied. Their adsorption at the air/solution interface and micellar properties (the critical micelle concentration, counterion binding, thermodynamic of micellization, hydrodynamic radius, etc.) were evaluated by surface tension, conductance and light scattering measurements. The surfactant mixed non-ideally in both the mixed films and in mixed micelles. A change of counterion binding was observed compared to the pure states. The composition of mixed films and mixed micelles, the corresponding activity coefficients, and the interaction parameters were determined using the regular solution theory.

adsorption; association; surfactants

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