FLUID INTERFACE TENSIONS NEAR CRITICAL END-POINTS

Novel local free-energy functionals are presented, generalizing the de Gennes-Fisher critical-point ansatz, for obtaining fluid interface tensions near critical end points and critical wall tensions. Nonclassical exponents, proper analyticity in T, etc., are embodied. New "interpolated linear-model" and "trigonometric" parametric equations of state then lead to universal ratio estimates K +/K- congruent-to -0.83, (K+ + K-)/K congruent-to 0.1(2), for the amplitudes K of the critical and K +/- of the noncritical/wall tensions.