title: Shape and size of highly concentrated micelles in CTAB/NaSal solutions by Small Angle Neutron Scattering (SANS).
abstract: Highly concentrated micelles in CTAB/NaSal solutions with a fixed salt/surfactant ratio of 0.6 have been studied using Small Angle Neutron Scattering (SANS) as a function of temperature and concentration. A worm-like chain model analysis of the SANS data using a combination of a cylindrical form factors for the polydisperse micellar length, circular cross-sectional radius with Gaussian polydispersity, and the structure factor based on a random phase approximation (RPA) suggests that these micelle solutions have a worm-like micellar structure that is independent of the concentration and temperature. The size of the micelle decreases monotonically with increasing temperature and increases with concentration. These observations indicate that large micelles are formed at low temperature and begin to break up to form smaller micelles with increasing temperature.
authors: Low Energy Neutron Source (LENS), Center for the Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408, United States. ncdas@indiana.edu
authors: Narayan Ch
authors: NCh
authors: Das
authors: Hu
authors: H
authors: Cao
authors: Helmut
authors: H
authors: Kaiser
authors: Garfield T
authors: GT
authors: Warren
authors: Joseph R
authors: JR
authors: Gladden
authors: Paul E
authors: PE
authors: Sokol