Micellar growth in mixed anionic/cationic surfactant solutions: Sodium dodecyl sulfate/octyltrimethylammonium (cas 15461-38-8) bromide system

Add time:08/21/2019    Source:sciencedirect.com

Static and dynamic light scattering, pulsed-gradient FT-NMR, viscosity, and surface tension are measured for the sodium dodecyl sulfate (SDS)/octyltrimethylammonium bromide (OTAB)/water system (below a total surfactant concentration of 1% by weight). Results in the single-phase micellar region (SDS-rich side) are consistent with the sphere-to-rod transition in micellar shape at a mixing ratio OTAB/(SDS + OTAB) ∼ 0.2. The phase behavior around the critical micelle concentration is also studied. Observed phase diagram in the dilute region is discussed on the basis of the change in the micellar composition with the total surfactant concentration.

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