Influence of fatty n-alcohols as cosurfactants in the micellization of polyethoxylate alcohol surfactants

COLL 222

Gerson Chávez, genrich2000@hotmail.com1, Giovanny Arenas1, Bélgica Bravo, belgicabravo@yahoo.es1, Ana Beatriz Caceres, caceresana7@cantv.net1, Nelson Márquez, nelsonm@reacciun.ve1, and Fredy J. Ysambertt, ysambertt@yahoo.com2. (1) Lab. Petroquímica y Surfactantes, Departamento de Química-Facultad de Ciencias, Universidad del Zulia, Maracaibo, 526, Venezuela, (2) Departamento de Química. Facultad de Ciencias, Universidad del Zulia, Avenida Universidad Edificio Grano de Oro, Modulo II, Maracaibo, Apdo. 526, Venezuela
The physicochemical properties of adsorption and association of nonionic surfactants mixed type polyethoxylated alcohols (APE) with EON = 10 in the water/air interface at different concentrations of 1-butanol, 1-hexanol, 1-octanol and 1-decanol as co-surfactants, was studied. The surface tension was measured as a function of the concentration of the surfactantes mixture (Cs) using the ring Du Nouy method to 25 oC. The critical micelle concentration (CMC), maximum surface excess concentration, minimum area per molecule at the solution/air interface, the effectiveness of the surface tension reduction, and the free energy of micellization and adsorption for this surfactantes mixture, was determined. These physicochemical parameters showed that the fatty n-alcohols are excellent cosurfactants which favor the micellization process of the APE surfactants mixture. A mathematical model can be expressed to predict this effect.
 

Fundamental Research in Colloid and Surface Chemistry
6:00 PM-8:00 PM, Monday, August 20, 2007 BCEC -- East Registration, Poster

Division of Colloid & Surface Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007