A SMALL-ANGLE NEUTRON-SCATTERING STUDY OF WORM-LIKE MICELLES

The structure of a cationic worm-like micelle at two concentrations, d ilute and semi-dilute in aqueous solution, was studied by a combinatio n of small-angle neutron scattering (SANS) and light scattering. It is found that the shape of the micelles can be best described as a rod w ith a large aspect ratio. SANS data were determined for the systems un der shear. For the semi-dilute solution, we observed that the scatteri ng pattern became anisotropic, as expected. Anisotropy was observed in the dilute solution, but only after a threshold shear rate was exceed ed. Details of the anisotropic patterns, moreover, depended on the mic elle concentration.