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Reference : UMR7636-FREAUG-013
Workplace : PARIS 05
Date of publication : Thursday, September 03, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 5 October 2020
Proportion of work : Full time
Remuneration : between 2696 and 3800 euros before taxes
Desired level of education : PhD
Experience required : Indifferent
As part of a collaborative research project between physicists at PMMH-ESPCI UMR7636 Gulliver Laboratory UMR 7083 "Bacteria confined in drops: a model of active thermal bath", funded by the Institute of Engineering and Systems Sciences (INSIS) of the CNRS for a period of 12 months.
In a bath of active particles, or active thermal bath, a passive object will undergo agitation, resembling Brownian motion. However, the diffusive properties, the collective mixing behavior, and the possibility of self-organization bestow on the driven passive objects novel emergent properties, far beyond the classical Brownian motion.
This project aims at exploring these new properties using a population of swimming bacteria confined into droplets. The specific goal of this postdoctoral position is:
1. to study the fluctuating motion of an inner droplet encapsulated inside a larger one that contains bacteria when systematically changing the radii of the two droplets.
2. to characterize the motion of solid passive objects of different shapes dispersed in a droplet containing bacteria. We expect to observe interesting and novel self-organization phenomena when several of these objects are dispersed inside the droplet.
The outcome of the experimental measurements will be compared with several propositions recently developed to describe active thermal baths in the framework of out-of-equilibrium stochastic thermodynamics..
Design the experiments and techniques to support and advance the research project.
Analyze and interpret data and results and write scientific reports and publications
Contribute to the writing of scientific projects
Write scientific articles and ensure scientific monitoring of the field
Present the results at internal scientific meetings, project meetings, and national and international scientific congresses
We are looking for a motivated candidate with expertise in optical microscopy and image analysis and training in statistical physics, physics of liquids and / or complex systems. A working knowledge of microfluidics and the active ingredient is also an asset.
Ability to communicate both written and oral in English for project reports and scientific meetings.
Ability to analyze and synthesize scientific results.
Autonomy with rigor for methodology and quality.
Interpretation of data and translation of results.
Writing of scientific manuscripts and research projects.
The position is based at the PMMH Laboratory located on the Jussieu campus of Sorbonne University. PMMH's “Granular media and active fluids” team headed by Prof. Eric Clément (Sorbonne University). The post-doctoral fellow will also use the confocal microscope from the Gulliver laboratory on the Vauquelin campus of ESPCI in conjunction with Dr Teresa Lopes-Leon, CR at CNRS and also a 3D nano-printing device managed by the PMMH.
The PMMH Group has recently developed an activity on the physical processes involved in swimming and the motility of microorganisms such as bacteria. More generally, the PMMH laboratory has developed a very wide spectrum of activities at the interface between physics and mechanics which also include biology problems.
Gulliver's group specializes in the soft matter of active systems and complex fluids and in particular, Dr Teresa Lopez-Leon at Gulliver has developed encapsulation techniques using microfluidic methods.
Constraints and risks
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