The research involves using an analytical solution of the Gibbs-Tolman-Koenig-Buff equation to calculate the microwire surface tension. The classical theory of nucleation and the statistical theory of density were used to determine dependencies for the surface energy of a cylindrical particle. It was shown that within the linear theory, both approaches produce similar results. However, within the nonlinear theory, the results may differ. The article presents an analysis of the analytical solutions of equations for a cylindrical surface within the van der Waals linear and nonlinear theories.