Adsorption Thermodynamics of Interacting Particles on Self-Similar Substrates: Statistical Fractals

M. S. NAZZARRO; F. NIETO; A. J. RAMIREZ-PASTOR

PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS

Elsevier

Lugar: Amsterdam; Año: 2004 vol. 331 p. 517 - 517

0378-4371

rand canonical Monte Carlo simulations have been performed inorder to study adsorption thermodynamics of pairwise interactingparticles on fractal surfaces. Diffusion-limited aggregates(DLA)have been used as a substrate where interacting particles areadsorbed.In order to obtain aggregates with differentmorphologies,DLA clusters are generated on different stronglycorrelated surfaces.Adsorption isotherm,adsorption energy anddifferential heat of adsorption were calculated for attractive andrepulsive nearest-neighbor (NN)lateral interactions.For the caseof repulsive couplings and low temperatures,four novel orderedphases has been found in the adsorbate,each one corresponding tothe formation of a chessboard-like structure on sites withone,two,three and four NN sites,respectively.The values ofcoverage at which these ordered phases emerge are not symmetricalaround $\theta=0.5$ .This is a consequence of the non