Quantum dots and platelets are a class of materials with great application promises and their self-assembly is a current subject of intense research. Hence, a better fundamental understanding of inter-particle interactions is a key challenge. An important component of inter-particle interaction is due to the surfactant coating of the nanocrystals. The density of the brush, the way the ligands self-assemble on the particle is thought to have an important effect on the short-range interaction between the nanocrystals. However, this interface is to date very poorly known since quantitative structural information is very difficult to obtain in solution. Here our aim is to use SANS to characterize the structure of the ligand brush and the nanoparticle/solvent interface. By using contrast variation between an hydrogen/deuterium organic solvent, a hydrogenated ligand and the particle we will measure the ligand brush thickness and density as a function of the particle shape (spheres or 2D platelets) and size. We will also quantify the degree of solvent penetration in the ligand brush, yielding an unprecedented view of the nanoparticle/solvent interface in solution.