Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2009-09-11
Pap. Phys. 1, 010001 (2009)
Physics
Condensed Matter
Soft Condensed Matter
9 pages, 8 figures
Scientific paper
10.4279/pip.010001
The adsorption of Ar on substrates of Li is investigated within the framework of a density functional theory which includes an effective pair potential recently proposed. This approach yields good results for the surface tension of the liquid-vapor interface over the entire range of temperatures, T, from the triple point, T_t, to the critical point, T_c. The behavior of the adsorbate in the cases of a single planar wall and a slit geometry is analyzed as a function of temperature. Asymmetric density profiles are found for fluid confined in a slit built up of two identical planar walls leading to the spontaneous symmetry breaking (SSB) effect. We found that the asymmetric solutions occur even above the wetting temperature T_w in a range of average densities rho*_ssb1 <= rho*_av <= rho*_ssb2, which diminishes with increasing temperatures until its disappearance at the critical prewetting point T_cpw. In this way a correlation between the disappearance of the SSB effect and the end of prewetting lines observed in the adsorption on a one-wall planar substrate is established. In addition, it is shown that a value for T_cpw can be precisely determined by analyzing the asymmetry coefficients.
Sartarelli Salvador A.
Szybisz Leszek
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