Abstract
Viscosity measurements under Newtonian flow conditions have been made to study the effect of organic additives on the micellar association of 0.2 M cetylpyridinium chloride (CPC) in aqueous medium at 30 °C containing different fixed concentrations of potassium salts (mainly KCl). 1-Hexanol (C6OH) and n-heptylamine (C7NH2) were used as the organic additives, and relative viscosity (ηr) vs [additive] plots were constructed for various KCl concentrations (0−2 M). In each case, after reaching a maximum, the |ηr| decreased on further addition of the additive (i.e., a peaked behavior). An interesting phenomenon of progressive shifting of the peak position toward lower [additive] was observed with increase in KCl concentration. This peak shift was found to be dependent on nature of the counterion but almost independent on the co-ion nature. The start of viscosity decrease at lower [additive] may be due to the fact that in the presence of KCl (because of its salting-out nature), the palisade layer gets saturated ...
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