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Diffusion des Rayons X aux petits angles / Small Angle X-Rays Scattering (SAXS)

X-rays are used to investigate the structural properties of solids, liquids or gels. Photons interact with electrons, and provide information about the fluctuations of electronic densities in heterogeneous matter. A typical experimental set-up is shown on Figure : a monochromatic beam of incident wave vector is selected and falls on the sample. The scattered intensity is collected as a function of the so-called scattering angle 2 teta.
The scattered intensity I(q) is the Fourier Transform of the correlation function of the electronic density.

Small angle scattering experiments are designed to measure I(q) at very small scattering vectors in order to investigate systems with characteristic sizes ranging from crystallographic distances (few Å) to colloidal sizes (up to few microns).


What is measured in a Small Angle X-ray Scattering (SAXS) ?

description of different experiment at  LIONS / LLB:

#737 - Last update : 06/06 2017
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Research The group's current fields of interest are the following: Nanomaterials: In our laboratory, we synthesize and characterize low dimensionality materials (0, 1 and 2D), by all means necessary and available. These materials can often be exfoliated/dispersed in solution leading to some complex/colloidal fluids, exhibiting a very wide range of fascinating behaviors.
Jun Han (PhD), Sergio Gomez (PhD, University of Vigo), Zeliha Cansu Canbek (running PhD), Fabien Hubert (PhD 2009), Benjamin Abécassis (PhD 2006), Fabienne Testard, Olivier Spalla
General objectives  We aim at understanding the microscopic mechanisms controlling the formation of nanoparticles. Different types of NPs are studied in the LIONS and among them gold NPs have already been the subject of several achieved PhD (B. Abécassis and F. Hubert) and on-going in-house studies (J. Han) and collaborative ones (S. Gomez from the Univiersity og Vigo).


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