The effect of temperature on viscosity has been investigated for aqueous sodium halide solutions of hexadecyldimethylammonium chloride (C16DAC), tetradecyldimethylammonium chloride and bromide (C14DAC, C14DAB), and dodecylammonium chloride (ClzAC) in semidilute regime. If the relative viscosity, depending on shear rate, is extrapolated to zero shear rate and is plotted against the micelle concentration, the scaling law vre? -(c -C O )~ holds. The exponent, x , for alkyldimethylammonium halides amounts to 1.2-1.8 within temperatures up to the lower consolute phase boundary, independent of the sort of surfactant. On the other hand, the reduced viscosity at zero shear rate of CIJIAC in 1.4 M NaCl is considerably higher than those of C14DAC in 2.6 and 2.8 M NaCl and CllDAB in 4.3 M NaBr. The viscosity of ClzAC in 0.3

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