INVESTIGADORES
BULNES Fernando Manuel
artículos
Título:
Critical behavior of repulsively interacting particles adsorbed on disordered triangular lattices
Autor/es:
M. A. PERARNAU; P. M. CENTRES; F.M. BULNES; A. J. RAMIREZ-PASTOR
Revista:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Editorial:
ROYAL SOC CHEMISTRY
Referencias:
Lugar: Cambridge; Año: 2010 vol. 12 p. 13280 - 13286
ISSN:
1463-9076
Resumen:
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A
simple model for amorphous solids, consisting of a triangular lattice with a
fraction of attenuated bonds randomly distributed (which simulate the presence
of defects in the surface), is used here to find out, by using grand canonical
Monte Carlo simulations, how the adsorption thermodynamics of repulsively
interacting monomers is modified with respect to the same process in the
regular lattice. The degree of disorder of the surface is tunable by selecting
the values of (1) the fraction of attenuated bonds ρ (0 ≤ ρ ≤ 1) and (2)
the attenuation factor r (0 ≤ r ≤ 1), where r is defined
as the ratio between the value of the lateral interaction associated to an
attenuated bond and that corresponding to a regular bond. Adsorption isotherm
and differential heat of adsorption calculations have been carried out showing
and interpreting the effects of the disorder. A rich variety of behavior has
been observed for different values of ρ and r, varying between two
limit cases: bond-diluted lattices (r = 0 and ρ ≠ 0) and
regular lattices (r = 1 and any value of ρ). In
addition, the critical behavior of the system was studied, showing that the
orderdisorder phase transition observed for the regular lattice survives,
though with modifications, above a critical curve (ρrtemperature).