Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/5157
Título: Properties of patchy colloidal particles close to a surface: a Monte Carlo and density functional study
Autor: Gnan, Nicoletta
Heras, Daniel de las
Tavares, José Maria
Gama, Margarida M. Telo da
Sciortino, Francesco
Palavras-chave: Directional Attractive Forces
Hard-Sphere Fluid
Associating Fluids
Critical-Behavior
Simulation
Coexistence
Model
Crystals
Liquids
Mixture
Data: 28-Ago-2012
Editora: Amer Inst Physics
Citação: GNAN, N.; [et al] – Properties of patchy colloidal particles close to a surface: a Monte Carlo and density functional study. Journal of Chemical Physics. ISSN: 0021-9606. Vol. 137, nr. 8 (2012)
Relatório da Série N.º: 084704
Resumo: We investigate the behavior of a patchy particle model close to a hard-wall via Monte Carlo simulation and density functional theory (DFT). Two DFT approaches, based on the homogeneous and inhomogeneous versions of Wertheim's first order perturbation theory for the association free energy are used. We evaluate, by simulation and theory, the equilibrium bulk phase diagram of the fluid and analyze the surface properties for two isochores, one of which is close to the liquid side of the gas-liquid coexistence curve. We find that the density profile near the wall crosses over from a typical high-temperature adsorption profile to a low-temperature desorption one, for the isochore close to coexistence. We relate this behavior to the properties of the bulk network liquid and find that the theoretical descriptions are reasonably accurate in this regime. At very low temperatures, however, an almost fully bonded network is formed, and the simulations reveal a second adsorption regime which is not captured by DFT. We trace this failure to the neglect of orientational correlations of the particles, which are found to exhibit surface induced orientational order in this regime.
Peer review: yes
URI: http://hdl.handle.net/10400.21/5157
DOI: 10.1063/1.4746428
ISSN: 0021-9606
Aparece nas colecções:ISEL - Física - Artigos



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