Statistical Thermodynamics of Adsorbates with Non-symmetrical Lateral Interactions

F. ROMÁ; A. J. RAMIREZ-PASTOR

PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS

The American Physical Society

Lugar: USA; Año: 2004 vol. 69 p. 36124 - 36135

1063-651X

The exact adsorption thermodynamics of particles with nonsymmetrical ad-ad interactions on a onedimensional space is presented. The asymmetry is introduced by considering the lateral interactions depending on the orientation of the adsorbed molecules. The adsorption process is monitored by following the adsorption isotherm, the thermodynamic factor, the differential heat of adsorption, and the configurational entropy of the adlayer. A rich variety of different behaviors is found with respect to the standard lattice gas of interacting monomers. The resulting thermodynamic description may also be applicable to adsorption and transport of nonspherical molecules in low-dimensional systems such as carbon nanotubes.