The critical exponent of Tolman's length

The change of surface tension with curvature is governed by a microscopic length, delta , introduced by Tolman. It is shown that this length diverges weakly at the liquid-gas critical point of the penetrable-sphere model, with an exponent ( mu - beta -1), where mu is the exponent of the surface tension, and beta of the orthobaric densities. This result is compared with those derived from Landau-Ginzburg-Wilson Hamiltonians.