Effect of salt and fatty n-alcohols in the viscosity behavior of emulsified surfactants/oil/water systems

COLL 255

Iran Parra, iranparra@gmail.com1, Gerson Chávez, genrich2000@hotmail.com2, Carlos E. Avendaño2, Bélgica Bravo, belgicabravo@yahoo.es2, Fredy Ysambertt, ysambertt@yahoo.com2, Ana Beatriz Caceres, caceresana7@cantv.net2, and Nelson Márquez, nelsonm@reacciun.ve2. (1) Laboratorio de Petroquímica y Surfactantes, Departamento de Química, Universidad del Zulia, Maracaibo, 526, Venezuela, (2) Lab. Petroquímica y Surfactantes, Departamento de Química-Facultad de Ciencias, Universidad del Zulia, Maracaibo, 526, Venezuela
Emulsified surfactant-oil-water (SOW) systems are found to exhibit a sharp change in viscosity near the optimum formulation for three-phase (microemulsions) behaviour. When the formulation is scanned through the three-phase transition by changing (in turn) of variables, the viscosity passes through a minimum. The phase transition and viscosity behaviour of the emulsified systems was studied achieved unitdimensional scans modifying the nature and concentration of salt and fatt n-alcohols (co-surfactants) as physicochemical formulation in anionic surfactants/water/oil systems. Each of the pre-equilibrated systems was emulsified according to a consistent procedure (given shear rates and mixing time). The phase behaviour was studied using conductimetric mensurations. The result obtained is consistent with the fact that for a low viscosity and for unitary water-oil ratio, the phenomenon is symmetrically similar as the interfacial tension variation. The concept of generalized formulation expression was used.
 

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