13C relaxation measurements of molecular motion in micellar solutions

Measurements have been made of the ¹³C nuclear magnetic resonance longitudinal relaxation time T₁ in micellar solutions of sodium lauryl sulphate with different concentration of added sodium chloride. The purpose of the experiment was to see what effect added electrolyte had on the motion of the paraffin chains. It is shown that the methylene group next to the polar head gains more freedom as the electrolyte concentration is increased. The molecular motions inside the micelle do not change.