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Univ. Paris-Saclay
Heterogeneous chemistry at liquid/solid and liquid /vapor interfaces under environmental conditions investigated by Near-Ambient Pressure XPS.
Héloise Tissot
LCPMR, Université Pierre-et-Marie-Curie, Paris et Ligne TEMPO, Synchrotron SOLEIL
Mercredi 09/07/2014, 11:00-12:00
CEA-Saclay, NIMBE Bât. 127, pièce 26

               The interaction of liquid water with gases or surfaces plays a major role in many processes of heterogeneous catalysis, electrochemistry, and environmental chemistry.  Near Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS) is an excellent method for the investigation of the interfacial chemistry. In newly developed NAP-XPS setups, the work pressure in the analysis chamber is raised up to 20 mbar. In those conditions, not only solid/gas interfaces are investigable by NAP-XPS, but also liquid water/solid and vapor/ liquid interfaces.

I will present two illustrative examples relevant to environmental molecular chemistry. First, I will demonstrate that core-level XPS can monitor the hydration process of the interlayer counterions of swelling clays. Second, I will show how XPS reveals the ion segregation at the vapor/ liquid water interface of sodium halide solutions.

Contact : David CARRIERE

 

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