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11 Apr 2024

Job Information

Organisation/Company
Sorbonne University - Paris Intitute of Nanosciences
Department
Institut des Nanosciences de Paris
Research Field
Physics » Surface physics
Physics » Chemical physics
Physics » Optics
Researcher Profile
First Stage Researcher (R1)
Country
France
Application Deadline
Type of Contract
Temporary
Job Status
Full-time
Hours Per Week
38
Offer Starting Date
Is the job funded through the EU Research Framework Programme?
Not funded by a EU programme
Is the Job related to staff position within a Research Infrastructure?
No

Offer Description

Keywords: Soft condensed matter physics, Granular matter, Complex fluids, Aqueous foams, Fluid mechanics, Experiments

Aqueous foams provide a promising route towards sustainable applications in a variety of domains, such as innovative construction, soil remediation, tissue engineering, or smart filters…. However, controlling the morphology and the functional properties of foamed materials constitutes a difficult task. This is due to the intrinsic aging processes at play in liquid foams before the hardening step [1], among which coarsening is challenging to be counteracted. Along this process, sometimes called “thermodynamic capitalism” because big bubbles grow at the expense of small ones, the foam microstructure is strongly altered. Therefore, the final microstructural features of the material are very sensitive to the coarsening kinetics or its eventual arrest. Actually, strong scientific questions remain about coarsening, especially in the case of liquid foams made with complex fluids, such as particle suspensions, concentrated emulsions or colloidal pastes. Here we propose to study coarsening dynamics of aqueous foams made from particles suspended in a yield stress fluid.

The objective of the thesis will be to set experiments to probe the coarsening of such foams with controlled parameters (bubble size, gas/particle/complex fluid volume fractions) and ageing conditions. The foam structure and dynamics will be studied using several techniques combining surface and bulk probes of the microstructure and its local rearrangements. The investigations will be designed in order to identify the conditions for which coarsening is efficiently counteracted by the particles confined between the gas bubbles, in terms of particle concentration, particle shape, particle/bubble size ratio, and rheological behavior of the suspending fluid. The analysis of the experiments will benefit from results of coarsening experiments currently performed on-board the International Space Station [2, 3], where gravity-induced flows are suppressed. The results will yield the basis to elaborate a scaling model predicting coarsening arrest.

[1] “Foam: Structure and Dynamics“, Cantat, Cohen-Addad, Pitois et al, Oxford University Press (2013)

[2] Pasquet, Cohen-Addad, Pitois et al, Soft Matter (2023) 19, 6267-6279

[3] Galvani, Cohen-Addad, Pitois et al, Proc. Natl. Acad. Sci. U.S.A. (2023) 120, e2306551120

 

Techniques/methods: Millifluidic, optical and fluorescence microscopy, multiple light scattering, x-ray microtomography, image and data analysis, mathematical modelling

Where to apply

E-mail
sylvie.cohen-addad@insp.upmc.fr

Requirements

Research Field
Physics » Surface physics
Education Level
Master Degree or equivalent
Skills/Qualifications

Background in condensed matter physcis, and/or soft condensed matter, and/or chemical engineering, and/orfluid mechanics

A pronounced taste for experimental work is required, as well as ability to work in a team.

Specific Requirements

Good abilities with Python langage

Languages
ENGLISH
Level
Good

Additional Information

Benefits

The PhD will aquire skills  in experimental research technics such as millifluidic, optical and fluorescence microscopy, multiple light scattering, x-ray microtomography, image and data analysis, mathematical modelling.

The PhD wil aquire deep knowledge and comprehensive understanding of soft condensed matter physcics, with fundamental aspects an underlying applications on complex fluids

Selection process

The candidate should send CV + motivation letter + references by email to Sylvie.cohen-addad@insp.upmc.fr and to olivier.pitois@univ-eiffel.fr.

If these elements matches the required profile, an interview by visioconference will be set.

Website for additional job details

Work Location(s)

Number of offers available
1
Company/Institute
Sorbonne university
Country
France
City
paris
Postal Code
75005
Street
4 place Jussieu
Geofield

Contact

City
Paris
Website
Street
4 place Jussieu
Postal Code
75005
E-Mail
sylvie.cohen-addad@insp.upmc.fr
olivier.pitois@univ-eiffel.fr

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