Abstract
Abstract The water/ethanol solutions of surfactants and/or their mixtures are very often used in practice. Alcohol changes largely, among others adsorption, aggregation and wetting properties of the surfactants. Therefore, measurements of the surface tension of the water/ethanol solution of rhamnolipid were made. For this purpose the du Nouy ring method was applied. The measured values of the surface tension of rhamnolipid water/ethanol solution were compared to those calculated using the Miller et al., Connors equations as well as independent adsorption method. These results were also analyzed taken into account the contributions of the adsorbed rhamnolipid and ethanol in the mixed film pressure at the water/ethanol solution-air interface. This analysis allowed us to determine the mutual effect of rhamnolipid and ethanol on their adsorption at the solution-air interface. The adsorption of the rhamnolipid and ethanol was discussed on the basis of the Gibbs, Langmuir and Frumkin equations of the adsorption isotherm. The tendency of rhamnolipid and ethanol to adsorb at the solution-air interface was discussed based on the Gibbs free energy of adsorption which was determined using different methods. The obtained results and their analysis show that there is not a synergetic effect in the water surface tension reduction by the ethanol and rhamnolipid mixture adsorption.
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