The reference inhomogeneous Percus-Yevick approximation for a dimerizing fluid near a hard wall

The inhomogeneous OZ equation, together with the LMBW equation for the density profile, with the bulk associating fluid taken as a reference system, is solved. Wertheimʹs description of the reference fluid, which provides an adequate description of chemical association far from the surface, is used. In the vicinity of the surface, the reference inhomogeneous PY closure is formulated and applied. The theory of Wertheim for bulk association is combined, for what we believe is the first time, with a pair level theory for inhomogeneous fluids. A few preliminary results for this reference approach are reported.