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Study of the aggregation of nonylammonium chloride in aqueous solutions of sodium chloride by vapor pressure osmometry |
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| Authors: | M Ballesteros C Coronel P A Galera-Gmez |
| Institution: | a Departamento de Química Analítica, Universidad de Alcalá de Henares, Alcalá de Henares, Madrid, Spain b S. Departamental de Química Analítica, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain c Departamento Quimica Física Farmacéutica, Facultad de Farmacia Universidad Complutense, 28040 Madrid, Spain |
| Abstract: | We determined osmotic coefficients from vapor pressure osmometry (VPO) measurements on aqueous solutions of nonylammonium chloride in the presence of NaCl at 30°C. VPO data were subsequently used to determine the critical micelle concentration (CMC) of the solutions of this surfactant. The values of this parameter obtained from VPO are well correlated with those obtained from light scattering. No premicellar aggregation was observed at surfactant concentrations below the CMC. The osmotic coefficients below the CMC may be evaluated from the extended form of the Debye–Hückel equation. Above the CMC, the dependence of the osmotic coefficient on the surfactant concentration was indicative of the occurrence of aggregation rather than the interactions in the system. Some comments are made on the uncertainty in the value of some parameters in micellar solutions and possible source of error using the VPO technique in these solutions. |
| Keywords: | Osmotic coefficients Nonylammonium chloride NaCl aqueous solutions |
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