| The dynamic and equilibrium surface tensions of a nonionic surfactant not previously available to industry, septaethyleneglycol monononyl ether (C9-7EO), were measured in pure water and with various salts. Experimental results indicate that the adsorption mechanism is primarily diffusion-controlled and is noticeably affected by the presence of inorganic salts. A thorough examination at a number of concentrations yields free energies of adsorption and micellization, surface concentration, and the rate of demicellization in concentrated solutions. Although the salt solutions lower the free energy of adsorption significantly, the salts also act to stabilize micellar aggregates which may have a detrimental effect on a desired detergency process. |
