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Reference : UMR5221-GLAMAS0-005
Workplace : MONTPELLIER
Date of publication : Wednesday, November 06, 2019
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 27 November 2019
Proportion of work : Full time
Remuneration : 2500-3000€ (CNRS references)
Desired level of education : PhD
Experience required : 1 to 4 years
The post-doctoral fellow will be part of the Soft Matter team at the Charles Coulomb Laboratory (L2C) at the University of Montpellier. He will work under the supervision of Gladys Massiera, as well as with Martin In on a microencapsulation process for the EPIC project. This project is part of a collaboration with two process engineering laboratories, the Chemical Engineering Laboratory (LGC) in Toulouse and the GEPEA (Nantes - Saint Nazaire). Its objective is to develop at a pilot scale an encapsulation process based on the generation of calibrated drops of aqueous phase and their coating through a liquid-liquid interface by centrifugation. The objective is to produce monodispersed capsules of controlled size, content and shell thickness. This project is based on the cDICE process (Continuous Droplet Interface Crossing Encapsulation, Patent EP2456550 A1, July 2010) patented by L2C. The final goal of the project is to build a prototype that meets industrial requirements in terms of capsule size (around 100 microns), shell thickness and production rate.
The candidate will be in charge of working on two fundamental aspects for understanding the conditions of passage and applying this knowledge on a pilot scale. He will have to:
(i) continue and deepen our current understanding on the droplet crossing of a liquid interface on an experimental set-up
(ii) propose and test several chemical systems for the solidification of shells and capsules and quantify the characteristics of the capsules resulting from the selected hydrodynamic parameters, such as shell thickness and mechanical strength.
The candidate will contribute to the project in different ways:
- Study and analysis of the droplet passage through an interface (image analysis using matlab or python), quantification of strain fields and velocity field and volume entrained by the passage,
- Proposal and evaluation of several chemical systems for the solidification of the capsule shell. Definition of objectives (specifications) two microencapsulation applications. Evaluation of the chosen systems using microfluidics (double emulsion), on our single-drop pilot, and then on a prototype in collaboration with the LGC to test the production rate.
- Capsule characterization: encapsulation rate, shell thickness, mechanical characteristics, chemical resistance (release condition).
Candidates must have a doctorate in physics, physico-chemistry, mechanics or process engineering and research skills in microfluidics, image analysis and physico-chemistry. Other essential criteria for this position are a good knowledge of image analysis, encapsulation, microfluidics. Ability to work in a team on multidisciplinary projects is required. Autonomy, and ability to plan and design experiments, as well as the ability to analyze, criticize, and communicate the results will also be necessary for the project. The candidate will have to show an ability to evolve and develop his/her skills quickly. Finally, a good command of spoken and written English is required as well as fluency in report or publication writing.
The Charles Coulomb laboratory is a joint CNRS - University of Montpellier unit. It is a physics laboratory whose expertise ranges from semiconductor physics to soft matter, and composed of experimental physicists and theorists. The laboratory is part of Labex Numev and is involved in many local, national and international collaborations at the interface with other sciences.
The candidate will join the soft matter team, which benefits from weekly intra-team scientific seminars and regular seminars with external speakers. The team has extensive equipment in colloidal size characterization, microscopy, rheology, meso-structure, interface characterization, light diffusion, fast camera acquisition, interface characterization, polymer and surfactant physico-chemistry.
Constraints and risks
Travels to the LGC in Toulouse as well as for presentations at conferences are to be planned.
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