The characterization of transport properties of nanostructures is central to numerous works in condensed matter physics. This is particularly true in fundamental research works on quantum properties of electronic transport across nano-objects (quantum dots, nanotubes), or in the field of molecular electronics or molecular spintronics. The main theme of this project is to study the quantum electronic transport properties of materials with strong electronic correlations in the regime of strong spatial confinement. When the size of a metallic or semi-conducting nanoparticle is reduced, the confinement of electronic wave functions in a tiny volume leads to a discrete electronic spectrum. As this electronic spectrum can be studied with tremendous precision by tunneling spectroscopy, it becomes possible to determine the energy levels distribution. This distribution can then be compared to theoretical predictions or numerical simulations. The study of quantum dots or nanoparticles with only a few electrons is particularly interesting because of the existing analogies with other many-body systems such as the electronic cloud surrounding individual atoms, atoms nucleus and cold atomic traps, which have defined several paradigms of many-body physics. Thus, the possibility to probe electronic energy levels distributions in materials with strong correlations provides us a mean to characterize these electronic correlations. Numerous progresses achieved in the synthesis of nanocrystals of various shapes and compositions provide us the opportunity to probe the discrete spectrum of nanoparticles with strong electronic correlations. This project will imply three partners who provide together all the required competences to achieve the tunneling spectroscopy of chemically-synthesized nanocrystals. Partner 1 and 3 are localized in Laboratoire Photons et Matière (LPEM), which is on the campus of ESPCI (Paris) and partner 2 is localized in Laboratoire de Physique des Solides (LPS) in Orsay. Partner 1, who is the coordinator of this project, is expert in the field of strongly correlated electronic systems and also has expertise in the synthesis and manipulation of metallic nanocrystals. Parter 2 is expert in mesoscopic physics, hybrids systems, Josephson junctions. Partner 3 is a group of physic-chemists, experts in the synthesis and characterization of nanocrystals of different shapes and composition, as well as in ligands exchange. A first part of the project is to study the statistical distribution of electronic levels of metallic (Au) and superconducting nanocrystals (Pb) obtained by chemical synthesis methods. A second part of this project is about the study of out of equilibrium transport properties of Mott nanocrystal, i.e. nanocrystals made from materials with characteristics properties of Mott insulators, in particular, NiO and VO2. A third part of this project is to measure the tunnel magnetoresistance of spinel nanocrystals MFe2O4 (M=Co,Ni), in order to test the spin-filtering abilities of these junctions. Finally, the fourth and last part of this project is to characterize the transport properties perpendicularly to thin films of insulating oxides such as VO2 and the spinels MFe2O4, using a n AFM/STM, working at low temperature and high magnetic field.