SIMPLE SALTS EFFECTS ON THE CHARACTERISTICS OF THE SHEAR THICKENING EXHIBITED BY AN AQUEOUS MICELLAR SOLUTION OF CTAB NASA1/

In this experimental work we investigate the effect of the addition of simple salts such as NaNO3, NaBr, NaCl, NaF on the rheological behavi our of an aqueous micellar solution of CTAB 0.1 M with NaSal at the co ncentration of 0.019 M. Experimental results indicate that the rheolog ical characteristics of the solution CTAB/NaSal exhibiting shear thick ening (critical shear rate corresponding to the occurrence of the shea r-induced structure, amplitude of the phenomenon, slope corresponding to the shear thinning evolution following the maximum viscosity) are p rogressively, but differently affected by the addition of the inorgani c salts. The effect of only a simple screening of electrostatic intera ctions is shown by the addition of small amounts of NaF.