Structure and phase equilibria of microemulsions

摘要: We present a simple phenomenological model to describe the phase equilibria and structural properties of microemulsions. Space is divided into cells side ξ; each cell filled with either pure water or oil. Surfactant molecules are presumed form an incompressible fluid monolayer at oil–water interface. The characterized by size‐dependent bending constant K(ξ), which small for ξ≥ξK, de Gennes–Taupin persistence length. predicts middle‐phase microemulsion length scale ξ≊ξK coexists dilute phases surfactant in oil water. (These have ξ≊a, being molecular length.) On same ternary diagram, we find also two regions two‐phase equilibrium involving upper‐ lower‐phase microemulsions that coexist almost At low temperatures and/or high values bare constant, K0≡K(a), may be entirely precluded separation lamellar phase...