The effects of concentration, pressure, and temperature on the diffusion coefficient and correlation length of SDS micelles

The effects of sodium dodecyl sulfate (SDS) concentration (less than or equal to 10 mass %), temperature (35 and 50 degreesC), and pressure (0.1 to 100 MPa) on the cooperative diffusion coefficient and static correlation length of micelles in solutions in 1 M NaCl were studied using static and dynamic light scattering. These data are interpreted in terms of models of dilute and semidilute solutions of rod-like polymers. The results indicate that the effects of pressure are most significant near the crossover concentration between dilute and semidilute solution behavior. This concentration is a function of temperature and pressure because both of these thermodynamic parameters affect the mean micellar size.