Light-Scattering and Small-Angle Neutron-Scattering Investigations of Double-Tailed Surfactants in Aqueous Solutions

摘要

Aqueous solutions of sodium p-(1-pentylheptyl)benzenesulfonate (6-PhC sub 12 SNa) at 45 exp 0 C were investigated using static and dynamic light scattering (LS) and static small-angle neutron scattering (SANS) measurements. The SANS studies in D sub 2 O were performed in the concentration range 0.0099-0.0991 M; Guinier radii (R/sub G/) of 13.7 to 16.6 A were determined. Scattering curves for the more concentrated solutions show an interaction peak which arises from intermicellar correlations; the effect of added NaCl, at a constant surfactant concentration of 0.0845 M, on these interactions was also studied. The SANS measurements were complemented by static and dynamic LS studies on 0.0845 M 6-PhC sub 12 SNa in H sub 2 O, with and without added salt. Non-single exponential behavior was observed in the intensity autocorrelation functions, and two interpretations of the slow process(es) are briefly discussed. (ERA citation 08:046971)