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We have observed the cloud point (CP) in the ionic surfactant sodium dodecyl sulfate (SDS) in the presence of 0.2 M tetra- n -butylammonium bromide (Bu 4 NBr). To study the changes taking place in the system approaching the CP, we have performed SANS studies with 0.3 M SDS as a function of [Bu 4 NBr] and temperature. The spectra obtained with Bu 4 NBr addition show micellar growth. The temperature increase has different effects on 0.1 and 0.15 M Bu 4 NBr systems. Further, the ionic micelles show characteristics of nonionics for 0.2 M Bu 4 NBr as the temperature was raised. The overall phenomenon is conjectured in light of gradual displacement of water from the clefts which characterize the micellar surface.
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Kumar et al. (2001) studied this question.
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