Abstract
Alkyl ethoxy sulfates represent an interesting class of ionic surfactants whose micellar properties depend on the number of ethoxy (EO) groups in their hydrophilic heads. A systematic experimental investigation was carried out on pure, monodisperse samples of dodecyl ethoxy sulfates having one, two, four, and six EO groups. Specifically, the effects of salt concentration (0.1−1.0 M NaCl) and temperature (25−45 °C) on micelle shape and size were investigated through dynamic and static light scattering and viscosity measurements. The classical DLVO potential was utilized to quantitatively analyze the effect of intermicellar interactions. In addition, quantitative consistency between the light scattering and viscosity results was demonstrated. It was found that the micelle shape and size of these surfactants are determined through an interplay of electrostatic interactions between the charged sulfate groups and steric interactions between the hydrated EO groups. This interplay can be tuned by varying the num...
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