Impact of the environmental conditions on the stoichiometry of magnetite nanoparticles


 AHLeGall    24/09/2021 : 21:55

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24/09 : soutenace de thèse de Phoomipat Jungcharoen (Université de Rennes 1, Géosciences Rennes)

Phoomipat Jungcharoen (Université de Rennes 1, Géosciences Rennes) soutient sa thèse, intitulée "Impact of the environmental conditions on the stoichiometry of magnetite nanoparticles", le vendredi 24 septembre 2021 à 14:00,

Devant le jury :

Reviewers

- Alexandre Gelabert, Maître de Conférences - Institut de Physique du Globe de Paris
- 
Grégory LefèvreChargé de Recherche CNRS - Chimie ParisTech

Examiners

- Aline DIA, Directrice de Recherche CNRS - Géosciences Rennes

- Fabienne GAUFFRE, Directrice de Recherche CNRS - Institut des Sciences Chimiques de Rennes

- Khalil HANNA, Professeur Université de Rennes 1 - École National Supérieur de Chimie de Rennes

Supervisor
- 
Rémi MARSAC, Chargé de Recherche CNRS - Géosciences Rennes

- Mathieu PÉDROT, Maître de Conférences - Géosciences Rennes

 

Keywordsmagnetite, maghemite, stoichiometry, solubility, solid-solution, geochemical speciation model, XMCD

 

Abstract:

Magnetite nanoparticles (MNs, 10 nm) are ubiquitous in natural environment and are widely used in many applications (environmental remediation, catalysis, energy storage, and medical therapy, etc.) due to their physical and chemical properties (optical, magnetic, semiconductor and large specific surface). However, stoichiometric MNs are drastically sensitive to the presence of oxygen and pH condition. This thesis aimed to study the evolution of the stoichiometry of magnetite and to develop predictive model of magnetite solubility under various parameters (pH, redox potential, oxidation, recharge, overloading of dissolved Fe(II), and the presence of organic ligands) by combining laboratory experimentation, synchrotron spectroscopy and geochemical modeling.



Contact OSUR

Phoomipat Jungcharoen (Université de Rennes 1, Géosciences Rennes) / @