In this work, they study the interaction between small water aggregates and hydroxylated graphite surfaces by means of quantum calculations. The hydroxylated graphite surfaces are modelled by anchoring OH groups on the face of a graphite crystallite of nanometer size. studied, by means of ab initio methods, the adsorption of water molecules on a OH group anchored on the face or on the edges of a graphite cluster modelling nanometer-size graphite crystallites. The calculations have been done by using the ONIOM method that partition the system into a small DFT clustering cluing the OH group and its nearest neighbor C atoms method for the rest of the graphite cluster. These calculations show that the OH group can act as a nucleation center for small water aggregates,containing up to 3–5 molecules, with mean adsorption energies per water molecule that range between 16.7 and 32.2 kJ/mol above the face, and between 19.3 and 34.2 kJ/mol above the edge of the hydroxylated graphite cluster.The present adsorption energies evidence a much stronger interaction between water and the hydroxylated graphite surface than between water and bare graphite surface (6.8 kJ/mol for a single water molecule adsorbed on bare graphite as already shown above a defective graphite surface containing COOH groups adsorbed either on the face or on the edge of graphite clusters.