Surface Term for the capillary condensations in a slit geometry

IGNACIO URRUTIA; LESZEK SZYBISZ

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2006 vol. 74 p. 172510 - 172514

1098-0121

It is shown that a bare simple model (SFM) proposed some years ago for studing adsorption between two semi-infinite solid walls can be improved by modifying the surface term in the grand potential for the film phase. Such a correction substantially improves the agreement between the predictions for the phase transitions provided by that SFM and results obtained from calculations carried out for 4He with density functional method at zero temperature. The corrective term depends on the strength of the adsorption potential and observables of bulk hellium.