Hubbard Penny L, McGrath Kathryn M, Callaghan Paul T
MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6001, New Zealand.
Langmuir. 2006 Apr 25;22(9):3999-4003. doi: 10.1021/la052998n.
Diffusion-diffusion correlation measurements by NMR are used to investigate the degree of orientational order in the lamellar phase of Aerosol OT (bis(2-ethylhexyl) sodium sulfosuccinate) and water at a range of surfactant concentrations (25, 33, and 50 wt %). We show that true isotropy of the domains is found at the lowest concentration but that at higher concentrations deviations from isotropy can be found, as evidenced by asymmetry on the 2D correlation distributions. We further discuss the significance of asymmetry in diffusion-diffusion exchange experiments, 2D distributions that should always be symmetric in steady state.
