Critical behavior of interacting monomers adsorbed on one-dimensional channels arranged in a triangular cross-sectional structure: Mixed interactions along and across the channels

PASINETTI P. M.; ROMÁ F.; RICCARDO J. L.; RAMIREZ PASTOR A. J.

JOURNAL OF CHEMICAL PHYSICS

AMER INST PHYSICS

Año: 2010 vol. 132 p. 54111 - 54117

0021-9606

Monte Carlo simulations and finite size scaling analysis have been carried out to study the critical behavior in a submonolayer lattice gas which mimics a nanoporous environment. In this model, the adsorbent is modeled as one dimensional channels of equivalent adsorption sites arranged in a triangular cross sectional structure. Two kinds of lateral interaction energies have be enconsidered: (1) wL interaction energy between nearest neighbor particles adsorbed along a single channel and (2) wT interaction energy between particles adsorbed across nearest- neighbor channels. We focus on the Case of repulsive transverse (wT>0) and attractive longitudinal (wL<0) lateral interactions, where a rich variety of structural orderings are observed in the adlayer depending on the value of the parameters kBT/wT (being kB theBoltzmannconstant) and wL /wT.The results reveal the existence of a first order phase transition in the adlayer between a low- temperature“condensed” phase and a high- temperature“ disordered” phase.