Adsorption Isotherms of Bitumen/Aqueous Solutions of Intan-100
Adsorption isotherms for pure bitumen/aqueous solution of the non-ionic surfactant Intan-100 have been determined as a function of temperature using enhanced video pendant drop technique. The area/molecule occupied by the surfactant at the bitumen/water interface is about 3 times higher at 30&deg;C than at 60&deg;C at which maximum packing occurs. Isotherms for the model system heptane/aqueous solutions of Intan-100 indicate that maximum packing is not possible in the temperature range 20-60&deg;C. This fact implies that bitumen/water interface is a unique system where the natural surfactant present in the bitumen is playing a competitive role at the interface.
Mohammed
RA
Department of Production, Intevep, S.A., Caracas, 1070-A, Venezuela
Lorenzo
MD
Mari&ntilde;o
J
Cohen
J