SIMULATION OF BICONTINUOUS MICROEMULSIONS - COMPARISON OF SIMULATED REAL-SPACE MICROSTRUCTURES WITH SCATTERING EXPERIMENTS

摘要: The ubiquitous scattering peak found in all disordered bicontinuous microemulsions, when measurements are made with an oil-water contrast, is attributed to the existence of two length scales system. lengths, d and ξ, appear explicitly Debye correlation function for microemulsion a phenomenological model proposed by Teubner & Strey [J. Chem. Phys. (1987), 87, 3195–3200] (T–S model). precise physical meaning these however, was not clear original paper. Cahn's scheme simulating morphology late-stage spinodal decomposition phase-separating two-component alloy extended case microemulsions equal volume fraction oil water. In simulation, scale {\bar d}=2π/{\bar k}, representing average interdomain distance (proportional domain size), another parameter z, relating dispersion size Δk/{\bar k} = (z + 1)−1/2, imposed. It shown that ratio ξ/d T–S unique 1/z. Cahn gives both real-space structure exact calculation corresponding intensity. A criterion given realisation terms universal range (i.e. ξ/d). having ratio, also implies I(Q) satisfies certain scaling relation. Our SANS data used support validity such