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In the present study we compare a structure of a Langmuir film assembled frommagnetic iron oxide nanoparticles on water surface and a structure of the samefilm after its transfer to a solid substrate by the Langmuir-Schaefer method.In contrast to most of related studies, where different techniques are used tocharacterize the films before and after the deposition, we use the samecombination of X-ray reflectometry and Grazing Incidence Small-Angle X-rayscattering. In both cases -- on a liquid and on a solid substrate -- the filmwas identified as a well-ordered monolayer of the nanoparticles laterallyorganized in a two-dimensional hexagonal lattice. However parameters of thelattice were found to be slightly different depending on the type of thesubstrate. It is also demonstrated that Langmuir-Schaefer technique is theright way for deposition of such kind of the particles on a solid substrate.

X-ray scattering characterization of iron oxide nanoparticles Langmuir film on water surface and on a solid substrate