Static and dynamic light scattering and surface tension
measurements were used to study the effects of various
pentanol isomers on sodium dodecyl sulfate (SDS) micelles in 0.5 M
NaCl. The addition of any of the
pentanol isomers increased both the average hydrodynamic radius,
〈R
h〉, and the average radius of
gyration,
〈R
g〉; however, the magnitude of the effect
depended on both temperature and pentanol isomer. By
comparing
the ratio of these two measures of micellar size, it was found that the
addition of pentanol promotes an
elongation of the rodlike micelles. The effects of the pentanol
isomers on the critical micellar concentration
also were determined. Once more the various isomers did not all
behave identically. Last, the effect of
temperature on micellar size in the presence of the various isomers was
determined. In all cases an increase
in temperature resulted in a decrease in mean micellar size; once more
the overall effect depended on the
isomer in solution.
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