  In the paper a bridge functional for the closure relation of the
three-dimensional reference interaction model (3DRISM) equations is proposed.
The effectiveness of the bridge for the aqueous solutions of the carbon
nanomaterials is tested. In the paper two classes of systems are investigated:
(i) infinitely diluted aqueous solutions of the Lennard-Jones (LJ) spheres and
(ii) infinitely diluted aqueous solution of the carbon nanotubes(CNT). The
bridge functional is fitted to the molecular simulation data. It is shown that
for all the investigated systems the bridge functional can be approximated by
the exponential function which depends only on the solute/solvent size ratio.
It is shown that by using the proposed bridge functional is possible (i) to
predict accurately the position of the first peak of the water oxygen density
distribution function (DDF) around the solute, (ii) to improve the accuracy of
the predictions of the first peak's height of the water oxygen DDF around the
solute (iii), to predict correctly the water hydrogen DDF behavior in the
vicinity of the CNT.
