  Application of "complete scaling" [Kim et al., Phys. Rev. E 67, 061506
(2003); Anisimov and Wang, Phys. Rev. Lett. 97, 25703 (2006)] to the
interfacial behavior of fluids shows that Tolman's length, a curvature
correction to the surface tension, diverges at the critical point of fluids
much more strongly than is commonly believed. The amplitude of the divergence
depends on the degree of asymmetry in fluid phase coexistence. A new universal
amplitude ratio, which involves this asymmetry, is introduced. In highly
asymmetric fluids and fluid mixtures the Tolman length may become large enough
near criticality to be detected in precise experiments with microcapillaries
and in simulations.
