  Close to a solid surface, the properties of a fluid deviate significantly
from their bulk values. In this context, we study the surface adsorption
profiles of a symmetric binary liquid confined to a slit pore by means of
molecular dynamics simulations; the latter naturally entails that mass and
concentration are locally conserved. Near a bulk consolute point, where the
liquid exhibits a demixing transition with the local concentration as the order
parameter, we determine the order parameter profiles and characterise the
relevant critical scaling behaviour, in the regime of strong surface
attraction, for a range of pore widths and temperatures. The obtained order
parameter profiles decay monotonically near the surfaces, also in the presence
of a pronounced layering in the number density. Overall, our results agree
qualitatively with recent theoretical predictions from a mesoscopic
field-theoretical approach for the canonical ensemble.
