Determination and calculation of micro-structural parameters of SDS/BA/H2O micelle

The micro-structural characteristics of sodium dodecyl sulfate (SDS)/benzyl alcohol (BA)/H2O micelle were studied by the methods of theoretical calculation, viscosity, dynamic light scattering, and Raman spectra. The radius of the spherical micelle was about 22.86–35.85 nm. The maximum length of rod-like micelle could reach up to 250.95 nm. In the micelle, the carbon chain of SDS was not completely stretched but still bended. The total chain length of SDS molecule in the micelle appeared to be 2 nm approximately. Both the axis ratio and the shape factor of rod-like micelles increased with the increase of aggregation number. The intrinsic viscosity and relative viscosity of spherical micelles were less than those of the rod-like micelles. The relative viscosity and critical micelle concentration values decreased gradually with the increase of BA content. The second critical micelle concentration of surfactant could also be determined through viscosity method.