Phase behavior and Physicochemical Properties of Water/ Cetyltrimethylammonium bromide -Propanol/Allylbenzene Micellar Systems

摘要

Water-propanol/ cetyltrimethylammonium bromide/allylbenzene micellar systems were formulated. The ratio (w/w) of n-propanol/ cetyltrimethylammonium bromide equals 2/1. The extent of the micellar region as function of temperature was determined. The micellar systems were characterized by the volumetric parameters, density, excess volume, ultrasonic velocity and isentropic compressibility. The micellar densities increase with the increase in the water volume fraction. Excess volumes increase with the water volume fraction and temperature. Ultrasonic velocities increase with water volume fraction up to 0.8 then decrease. Ultrasonic velocities increase with temperature for water volume fractions below 0.8 and increase for water volume fractions above 0.8. Isentropic compressibilities decrease with the water volume fraction up to 0.8 then increase. Isentropic compressibilities increase with temperature for water volume fractions below 0.8 and decrease for water volume fractions above 0.8. Structural transitions from water-in-oil to bicontineous to oil-in-water occur along the micellar phase. The particle hydrodynamic diameter of the oil-in-water micellar systems decrease with temperature. In the diluted region nanoemulsions systems were observed.