Hydration of clays: advanced environmental spectroscopies and simulations on the atomic scale

Partenaires du projet
  • Jean-Jacques GALLET, porteur de projet
    LCPMR - Eqp. Surfaces fonctionnalisées et environnementales

  • Virginie MARRY
    Laboratoire PECSA
Description

The PECSA and LCPMR teams involved in this project will study the key parameters controlling the hydration of well characterized synthesized clays, analogous to those used in environmental engineering, in a first step, and of natural smectites, in a second step. The partners will combine advanced spectroscopies with simulations at various scales, down to the molecular level. Besides neutron spectroscopies that give structural and dynamical information on bulk systems, we shall make intensive use of electron spectroscopies, to reveal the nature of the chemical bonds (including hydrogen bonds), the exchangeable cation position and liganding, at the top of clay lamellae and in the inter-lamella region. As we will rely on surface science tools, using the X-Ray Photoelectron Spectroscopy (XPS) instruments of the LCPMR --i.e. the Intermediate Pressure XPS (IP-XPS) (10-3 mbar) and the new Near Ambient Pressure XPS (NAP-XPS) (20 mbar) installed at SOLEIL in September 2012,-- the present proposal aims at providing to our XPS setups, equipments enabling the controlled deposition of clay sheets on flat substrates in clean conditions, for a total sum of 31 376 euros (VAT not included).