EFFECT OF ETHOXYLATED NONYL-PHENOLS ON INTERFACIAL RHEOLOGICAL PROPERTIES OF OIL WATER SYSTEMS/

Interfacial rheological properties of different Hungarian crude oilwat er systems were determined in wide temperature and shear rate range an d in presence of ethoxylated nonyl-phenols with ethoxy group number be tween 10 and 40. The fundamental conclusion of the experimental result s is that the interfacial viscosity, the non-Newtonian flow behavior a nd the activation energy of the viscous flow drastically decrease in p resence of non-ionic surfactants. Modification of these interfacial rh eological properties increase with decreasing ethoxy group number and increasing tenside concentration and temperature. The most radical cha nge was observed in presence of NPEO10. As a summary it was evidenced that the interfacial rheology is an efficient and powerful detection t echnique, which may enhance our knowledge on formation, structure, pro perties and behavior of interfacial layers formed in oil/water systems . Thus, similar studies will probably accelerate the progress signific antly not only in oil recovery but also in all areas of colloid scienc e and technology.