Cloud Point Phenomenon in Ionic Micellar Solutions: A SANS Study
2001; American Chemical Society; Volume: 17; Issue: 9 Linguagem: Inglês
10.1021/la001215p
ISSN1520-5827
AutoresSanjeev Kumar, Vinod K. Aswal, Andleeb Z. Naqvi, Prem S. Goyal, KABIR‐UD‐DIN KABIR‐UD‐DIN,
Tópico(s)Spectroscopy and Quantum Chemical Studies
ResumoWe 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 (Bu4NBr). 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 [Bu4NBr] and temperature. The spectra obtained with Bu4NBr addition show micellar growth. The temperature increase has different effects on 0.1 and 0.15 M Bu4NBr systems. Further, the ionic micelles show characteristics of nonionics for 0.2 M Bu4NBr 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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