SCALING PROPERTIES OF A SPIN MODEL OF MICROEMULSIONS

Large scale Monte Carlo simulations are used to study the scaling prop erties of a new spin model of microemulsions near a critical temperatu re. The critical exponent beta of the order parameter (water concentra tion) and the correlation-length exponent nu are in excellent agreemen t with those of the 3D Ising model and are also in complete agreement with the experimental measurements. However, nu and beta for the same model but in a porous medium, modeled by a percolation system, do not agree with those of either the dilute or the random-field Ising model.