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Reference : UPR3079-LUDBRU-010
Workplace : ORLEANS
Date of publication : Tuesday, August 13, 2019
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 November 2019
Proportion of work : Full time
Remuneration : Gross monthly 2617 €
Desired level of education : PhD
Experience required : 1 to 4 years
Researcher's activities will form part of a transdisciplinary research project granted by the laboratory common to two research groups of the laboratory “Extreme conditions and Materials: High Temperature and Irradiation” (Conditions Extrêmes et Matériaux: Haute Température et Irradiation, CEMHTI):
• The group Materials and Resonance: Conception, Characterization & Applications who aims at enhancing his know-how in Magnetic Resonance Imaging (MRI) to study in situ the capillarity in ceramics
• The group Transparent (glass) Ceramics and Refractory Ceramics who studies capillary impregnation phenomena at the origin of the refractories corrosion by slag considered as reactive impregnation.
He/she will work under the supervision of Emmanuel de Bilbao, Associate Professor (habilitated) at the University of Orléans (Refractories group), and Vincent Sarou-Kanian, Research Engineer at the CNRS (MRI group).
Refractory materials are widely used in the industry of high-temperature material processes (steel making, glass making, cement making...) because of their exceptional properties under extreme conditions, namely at high temperature and in presence of corrosive agents. They also are used in new applications in the field of new energy production (biomass gasification, dangerous industrial waste incineration and waste gasification). Although refractories have been studied for a long time, designing new high-performance refractory materials is still challenging for raw materials suppliers as well as refractory producers while predicting and optimising the durability of adapted refractory materials requires the knowledge of a lot of properties since corrosion proceeds from multi-physics mechanisms involving reaction kinetics and transport – diffusion for gases, capillarity for liquids. Focusing on slag impregnation, the impregnation is mainly driven by capillary suction. The Refractory Ceramics group has developed different experiments for modelling and simulating this impregnation mechanism. It is now aimed to develop an experiment allowing for the monitoring of in situ non-reactive impregnation using MRI. Unlike X-ray computed tomography, the acquisition time of MRI is compatible with impregnation kinetics of concern.
An MRI device has been developed by the MRI group to monitor in situ impregnation of porous media with liquid. The capillary rising test consists of putting a cylindrical sample above a container full of liquid and putting the assembly inside the NRM probe to follow the imbibition front dynamically. Preliminary tests performed in 1D configuration have shown the reliability of the approach.
The objectives of the project are now:
- To improve the experiment protocol and the interpretation of the results to obtain information on the space and time evolution of the saturation.
- To extend the 1D measurement technique to 2D and 3D.
The post-doctoral fellow shall contribute to MRI experiments of capillary impregnation of porous media with liquid by combining MRI techniques with relaxation time measurement.
- Sample preparation
- Improvement (if needed) and validation of the dedicated device
- Capillary test
The applicant is expected to have:
- Recent PhD thesis (< 2 years)
- skill in research attested by, at least, one paper as first author or second author in topics in relation to the activities of the project;
- strong skills in MRI
- Skills in porous media characterization based on relaxation time measurement (Laplace inversion) would be appreciated
- General knowledge about porous medium and specific characterization techniques
- Appetite for experiment development and RMN methodology
- very positive attitude for working in a team, on a multidisciplinary project (material science, physics
- organisational ability and ability to learn and develop one's skills
- fluent French and English, written and spoken.
CEMHTI research unit (UPR 3079, Orléans, France) belongs to CNRS (unit of the Chemistry Institute). The laboratory is located in CNRS campus on two sites (high-temperature site and cyclotron).
The laboratory develops strong skills and original tools at national and international level to study physical and chemical properties of mater in extreme conditions.
The researcher will work in the High-Temperature site and will join the group MRI.
Constraints and risks
Short periods of travel (1 or 2 weeks) should be expected
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