Adsorption of amphiphilic dimers at surfaces

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:230

Article

Wu, DW ; Aranovich, GL ; Donohue, MD

关键词: asymmetric dimers;    interface;    adsorption isotherm;    thermodynamic equilibrium;    lattice theory;    amphiphiles;   

DOI  :  10.1006/jcis.2000.7059

来源: Elsevier

【 摘 要 】

Adsorption of amphiphilic dimers is analyzed in the framework of density functional Ono-Kondo theory. There are three configurations for dimers absorbed at a surface: one parallel to the surface and two perpendicular to the surface (AB and BA, with A or B touching the surface, respectively). Densities of molecules in each configuration are calculated from density functional theory and compared to Monte Carlo simulation data. There is good agreement between theory and simulations. It is shown that the parallel configuration is preferred over the perpendicular configuration, except when there are very strong asymmetries in intermolecular forces. In most cases, the parallel configuration is even preferred over the combination of the two perpendicular configurations, (C) 2000 Academic Press.

【 授权许可】

Free