Nanostructured materials exhibit important density of interfacial area, and this often gives them remarkable properties. In the specific field of thermal transport properties tailoring, a general wellknown trend is the reduction of thermal conductivity in nanocrystalline systems while compared to the bulk ones due to phonon scattering at the interface. Nevertheless, this rule has exceptions and counterexamples , like enhancement of thermal transport in nanofluids [1] and in polar nanomaterials [2], have been already observed. Our presentation will be focused on such atypic cases, with investigations about porous matrices filled by liquid. It will be demonstrated that significant enhancement of the thermal conductivity of such "solid/liquid" nanocomposite systems occurs in comparison with the pristine empty porous matrix. We will also show that the magnitude of such enhancement is directly related to the specific surface area of the interface separating solid and liquid phases. Eventually, the crucial impact of the adsorbed liquid layer on thermal properties in such nanocomposites will be discussed. In this presentation, the analytical model developed to describe the thermal conductivity features in the considered system will be exposed.