Etude de la chimie de l'eau en présence d'ions dans des silices nanoporeuses
Résumé
Prediction of material behaviors regarding their interactions with
water is interesting for geochemistry and requires the use of
modelling. Thermodynamic models and rate laws integrated in
computer programs (PHREEQC, JChess…) used to predict
materials dissolution kinetics and phase transformation integrate
data obtained from experiments performed in diluted media. Due to
the fact that most of the materials in these domains are nanoporous
filled with water and ions (clay materials, secondary minerals
formed from rocks, alteration layer of glasses…) and the validity of
these models and rate laws are still not proven yet, thus, prediction
can be defective.1 The strong interaction between water and the
surface in confined media are not considered in such calculations.
Furthermore, it is also expected that nanoconfined water molecules are strongly influenced by the presence
of ions through sorption processes at the surface. The ions ability to be solvated also modifiy the electrostatic
interactions in the system. These are really important since it strongly impacts the hydrolysis rate of
materials
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