offres de post-doctorats

AFM study at liquid/liquid interface (NEW)

Funding is available for a 18-month post-doctoral fellowship at the Institute for separation Chemistry of Marcoule close to CEA Marcoule and Avignon.

The topic of interest is a study using an AFM technique for probing a liquid-liquid (LL) interface containing compling agents for "operando" follow-up  of the ion transfer between two immiscible liquid phases as well as the associated hydrodynamic effects through measurements of variations in the (visco)elastic properties of the LL interface. This proposal is at the interface between physics, chemistry and the separation science.

The ideal candidate should preferably hold a PhD in soft-matter or in physical chemistry and have prior experience in interface science. Eligible candidate should have defended his/her Phd no longer than two years before the beginning of the postdoc. Interest in developments with millifluidic set-up and investigations using (non-)linear optical techniques are required. Prior knowledge of these techniques is not mandatory but will be considered as an asset.

Collaboration will take place with some teams of ISEC in Marcoule CEA (ISEC) who work on ion separation process and kinetics analysis (A. LELIAS, F. LAMADIE and A. MAGNALDO) and with an expert in AFM techniques on LL interface with Dr L. COSTA at CBS institute in Montpellier.

Starting date is flexible but should not be later than January 2021.

Interested candidates should send by email their CV, motivation letter and their list of publications along with the names of two references to Olivier DIAT (L2IA team), Michaël ODORICO (L2ME team) or Luc Girard (L2IA team) (Olivier.diat@cea.fr;michael.odorico@cea.fr; luc.girard@enscm.fr).

Be aware that once selected, 2 months at minima are required to fulfil the administrative procedures of the CEA.

Gross salary: 2850¤ minimum

study of the interfacial layer and of the anisotropy of water dynamics within aqueous solutions confined in model silica materials

Contrat postdoctoral CEA de 12 mois au LNER à partir de septembre/octobre 2020

The understanding and the prediction of macroscopic behavior of nanoporous materials in aqueous solutions in the fields of geochemistry, construction, environment, effluent treatment, catalysis, and nuclear, require the use of geochemical modeling. This modeling is often carried out with softwares (PHREEQC, JChess, etc.) which take into account thermodynamic concepts and kinetics laws obtained from experiments performed in dilute media (concentration of dissolved ions, pH, kinetics and thermodynamic constants...). These nanoporous materials which can be cementitious materials, geopolymers, biomaterials, membranes, corrosion products, clay materials, secondary minerals... consist in a set of confined media of a few nanometers completely or partially filled with water and ions in which the validity of these concepts and laws has not been demonstrated. This validation is really important since the processes occurring in their nanoporosity such as ion sorption, phase precipitation, dissolution and recondensation, diffusion are different from those occurring with dense material in aqueous solution and are at the origin of their macroscopic properties. 

Read more...

Candidate profile :

The young doctor have to be independent, both in terms of materials synthesis and characterization. A good knowledge of scattering techniques is required (at least SAXS). Moreover, this project is a fundamental study which requires curiosity to carry out a bibliographic work and to communicate with the various collaborators. Finally, good writing skills are essential in order to publish articles.

Contact : Diane REBISCOUL (diane.rebiscoul at cea.fr),

synthèse et caractérisation structurale de phases minérales d'uranium de référence pour l'identification de phases porteuses d'uranium en environnement minier par slrt

Contrat postdoctoral CEA de 12 mois au LIME à partir de juin 2020

Dans le cadre d’un projet de recherche collaboratif entre le CEA et Orano, une étude est menée pour détecter et identifier les phases porteuses d’uranium dans les résidus des traitements miniers et les stériles par spectrofluorimétrie laser à résolution temporelle (SLRT). La spectroscopie SLRT est un outil de spéciation permettant de sonder l’environnement chimique local de l’uranyle. Néanmoins, l’identification des phases uranifères au sein d’un échantillon prélevé sur site par SLRT repose sur l’utilisation d’un modèle chimiométrique construit à partir d’une base de spectres de référence. Afin d’enrichir et diversifier la base de spectres de référence la préparation et la caractérisation structurale d’échantillons uranifères synthétiques au sein de trois familles principales s’avèrent nécessaire. Ces familles phases minérales sont les oxyhydroxydes, les sulfates et silicates d’uranyle. L’acquisition des spectres SLRT des phases synthétisées et la mise en évidence de l’impact de la chimie de coordination de l’ion uranyle sur les spectres enregistrés constitue le second volet de ce travail.

Qualifications :

  • Docteur en chimie des matériaux,
  • Cristallochimiste possèdant des compétences en synthèse par voie aqueuse (précipitation directe et hydrothermale) et par chimie du solide,
  • Autonomie en identification, résolution structurale et quantification de phases par DRX sur poudre et monocristal,
  • Connaissance des différentes techniques de caractérisations MEB, Raman, ATG/ATD, …,
  • Des connaissances en chimie de l’uranium et chimie du cycle du combustible nucléaire seraient appréciées.

Contacts : Stéphanie SZENKNECT (stephanie.szenknect at cea.fr), Adel MESBAH (adel.mesbah at cea.fr) et Nicolas DACHEUX (nicolas.dacheux at umontpellier.fr)
Financement : CEA DEN
Référence : PsD-DEN-20-0049

Offres d'emplois