Missions

This postdoctoral project, based at MATEIS laboratory, focuses on studying the three-dimensional structure and coarsening mechanisms of elastocapillary foams—materials with properties intermediate between liquid and solid states. While surface imaging can measure average bubble growth, it does not always accurately reflect the behavior of these complex systems. X-ray tomography is therefore critical, providing high-resolution 3D imaging suitable for a wide range of liquid fractions and media, from aqueous solutions to polymers and metallic foams.
The MATEIS team has developed rapid X-ray imaging techniques, achieving acquisition times on the order of one minute with spatial resolutions on the micrometer scale. Using a dual tomograph capable of acquiring radiographs at 30 Hz from two distinct angles, it is now possible to monitor foam coarsening in real time—a process previously limited to synchrotron facilities. This project builds on collaborations with the SIMM and ILM laboratories, combining expertise in elastocapillary phenomena, solidification kinetics, and advanced imaging to explore the structural evolution of these materials

Activities

Analyze foams prepared by partner laboratories using X-ray tomography at MATEIS.
Optimize imaging parameters for bubble sizes ranging from tens to hundreds of microns.
Extract structural descriptors, including:
- Bubble size distribution.
- Neighbor count per bubble.
Map the fluid and solid networks within the foam.
Conduct in situ experiments to track the evolution of the microstructure over time.
Tailor acquisition rates to capture both slow and rapid changes.
Consider accessing synchrotron facilities if higher acquisition speeds are required.

Skills

PhD in Physics, Material Science, or Applied Mathematics, with expertise in 3D image analysis, X-Ray tomography, and programming (Python/Matlab). Ability for team work (management of meetings), autonomy, writing skills in english.

Work Context

Work within the MATEIS laboratory (Ceramics and Metal teams, 40 people each). Several tomographs are available on site, in-house training, proposals for synchrotron follow-ups will be drafted. Possible travels to Paris for meetings at ESPCI.
The laboratory is a centre of excellence in Materials Science, with a total of 180 staff members divided into six research teams.
By joining the CNRS, we offer you:
• A stimulating work environment in contact with research staff
• 44 days of holiday/RTT per year
• Excellent working conditions (flexible hours, teleworking)
• A staff restaurant offering lunch at an attractive price
• Partial reimbursement of transport costs (75%) + sustainable mobility allowance of up to £300/year
• A site accessible by public transport + private car park
• Financial contribution to mutual insurance costs

Constraints and risks

No associated risks