Probing simultaneously the volume and surface structure of nanospheres adsorbed at a solid-liquid interface by GISANS |
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Authors: | F Cousin J Jestin G Chaboussant S Gautrot A Menelle and F Ott |
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Institution: | (1) CEA-CNRS, IRAMIS, Laboratoire Léon Brillouin, 91191 Gif-sur-Yvette, France |
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Abstract: | We demonstrate in this paper the possibilities offered by
Grazing Incidence Small Angle Neutron Scattering (GISANS) for the study of
solid/liquid interfaces. We present experimental results obtained by
Specular Neutron Reflectivity (SNR) and GISANS on a model system made of
silica nanospheres adsorbed on a silicon wafer by electrostatic interactions
both at solid/air interface and solid/liquid interfaces. At the solid/liquid
interface, we demonstrate that grazing incidence scattering enables to
discriminate the surface and the bulk scattering. The surface structure
factor derived from GISANS shows that the nanospheres are organized as a
repulsive liquid system, with a surface fraction occupation consistent with
values obtained by SNR. This original setup highlights a direct correlation
between the structure of the silica nanospheres in solution and their
organization on the surface: due to the strong electrostatic repulsions
between spheres, their organization at the surface is close to the
projection in 2D of the 3D organization of the nanospheres in solution. |
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Keywords: | |
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