Abstract
Abstract The present studies were performed to see the influence of counterion size on the viscosity behaviour of 0.3M sodium dodecyl sulphate micellar solutions at 30° C. Some symmetrical quaternary ammonium salts (R4NBr where R=H, CH3, C2H5, n-C3H7 or n-C4H9) and two organic salts (thiamine hydrochloride and guanidine hydrochloride, THCl and GuHCl)) were used for deriving the counterions. The viscosity decreased, increased and again decreased as the concentration of R4NBr was progressively increased (no initial fall was detected with (n-C4H9)4NBr). The |ηr| was always higher with the combination SDS-(C2H5)4NBr than with SDS-(n-C3H7)4NBr. The results are interpreted in the light of adsorption/intercalation of the counterions or their electrostrictive/hydrophobic nature. Similar reasoning is invoked for THCl addition. The viscosity results of GuHCl addition are discussed with reference to its water structure breaking nature.
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