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Enhanced Poly(Ionic Liquid) Lubricants: multiscale structure and interfacial properties (H/F)

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General information

Reference : UMR8502-FRERES-002
Workplace : ORSAY
Date of publication : Monday, June 22, 2020
Scientific Responsible name : Frédéric RESTAGNO
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Poly(Ionic Liquid) refer to a special type of polyelectrolyte in which each monomer unit is composed of ionic liquid (IL). They have recently drawn significant attention since they present a unique combination of the properties of ILs (e.g.high thermal, chemical, electrochemical stabilities, interfacial adsorption and enhanced ionic conductivity. . . ) with those of polymer materials (e.g. processability, viscoelasticity, adhesion, film-forming properties, and broad macromolecular design...). On a polymer physicist point of view, the main difference between an ideal polymer melt and PILs stems from the presence of counter-ions and local interactions between IL monomer units due to their amphiphilic nature. Preliminary experiments involving small angle neutron scattering have highlighted the influence of these local interactions on the conformation of PILs chains leading to a deviation from ideal polymer chains conformation. Such a deviation has a strong influence on the bulk viscoelastic properties of PILs which may lead to enhanced lubrication properties. The aim of this PhD project is to understand the role of the macromolecular conformation both in bulk and at interface on the slippage of PILs at interfaces.
In order to answer such question, we plan to combine structural characterization using neutrons and X-ray scattering techniques and slippage measurements using photobleaching based velocimetry measurements.

Work Context

The thesis will take place at the Laboratoire de Physique des Solides in Orsay, in the group Matière Molle aux Interfaces (MMOI https://www.equipes.lps.u-psud.fr/mmoi) composed of 5 permanent researchers, 2 emeritus, 2 engineers, 2 post-docs and 8 PhD students.

The doctoral student will be directly supervised by F. Restagno (CNRS research director) and Alexis Chennevière (LLB CEA - CNRS). The collaboration involves L. Léger from LPS.

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