A two-dimensional-reference interaction site model theory for solvation structure near solid-liquid interface.

We develop a new equation to describe solvation structure near solid-liquid interface at the atomic-level. The developed equation focuses on anisotropy of solvation structure near the interface by using two-dimensional density distribution of solvent along two directions, one of which is perpendicular to the interface and the other is parallel to the interface. As a first application of the equation, we treat a system where a solid modeled by an atomistic wall is immersed in solvent water. The preferential adsorption position of water molecules and the change of water orientation by charging the wall are discussed.