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M/F Postdoctoral researcher - Characterization and mechanical study of fibrous materials for lithium extraction

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Français - Anglais

Date Limite Candidature : jeudi 7 octobre 2021

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General information

Reference : UPR22-THIROL-003
Workplace : STRASBOURG
Date of publication : Monday, September 27, 2021
Type of Contract : FTC Scientist
Contract Period : 13 months
Expected date of employment : 1 October 2021
Proportion of work : Full time
Remuneration : From 2675.28 euros gross monthly according to experience
Desired level of education : PhD
Experience required : Indifferent

Missions

Lithium is present almost everywhere in the world in its natural state. It is most often found in the form of ore directly embedded in rock or in underground brines associated with other mineral salts. However, its extraction under reasonable conditions requires a minimum concentration and heavy and polluting means. With the rise of electric vehicles and the growing demand for lithium batteries that accompanies it, it is becoming essential to develop new resources and forms of extraction thereof.
Recently, the company GEOLITH has developed materials based on microfibers with selective absorption properties. They act as a "filter" to selectively capture lithium. This technology (Li-Capt) stands out from the others by being more respectful of the environment and paves the way for less concentrated lithium deposits, in particular geothermal and petroleum water still unexploited to date.
To allow industrialization of this Li-Capt process, a collaborative Research & Development (R&D) and Innovation project between the company GEOLITH and several laboratories in the Grand-Est region has been set up. In this context, the Charles Sadron Institute is recruiting a Postdoctoral researcher to study the mechanical behavior of the Li-Capt material with a view to optimizing the fluid flow of this material conditioned in the form of coils. In particular, it is now known that depending on the tension profile of the coil, it can take more or less "loose" forms or under stress present over-stresses in the center, generating undulations more or less compatible with a role of filtration.
In particular, the study will be focused on the characterization of Li-Capt materials in X-ray tomography under in-situ stresses with controlled environment (hygrometry and temperature). The objective will be to establish a correlation between the microstructure of the material's microfibers, their topologies and the strain fields. Also, to allow optimization of the tension profile for winding but also to take account of its resistance over time, the viscoelastic nature of the material must be studied.

Activities

The problem concerns the in-situ mechanical characterization by X-ray microtomography of fibrous materials as a function of humidity and temperature. A study of the topological optimization for the implementation of a winding of these materials will also be carried out.
- X-ray tomography of the material and of a stack of the uncompressed and compressed material.
- Measurements of material creep and stack creep: tomo RX analysis as a function of time
- Profile of the constraints of the coiled material: evolution of local states as a function of time.

Skills

- Ph. D. in mechanics of materials (fibrous, porous, composites)
- Skills and taste for experimentation: experience of in-situ tests in X-ray microtomography would be appreciated
- Knowledge in numerical modeling: mastery of a calculation code (numerical simulation).

Work Context

The Charles Sadron Institute (ICS) is a CNRS research unit located on the Cronenbourg campus. This multidisciplinary institute dedicated to polymer materials and self-assembled systems employs around 190 people, half of whom are non-permanent. The ICS is organized into 7 research teams, 4 technological platforms and administrative and technical services. The recruited person will be assigned to the MIM team (Mechanics of Interfaces and Multiphase Systems).

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