Reference : UMR7643-ANNDUJ-008
Workplace : PALAISEAU
Date of publication : Friday, July 29, 2022
Scientific Responsible name : Henry Hervé
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 November 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Numerical study of membrane formation through diffusive and hydrodynamic transports during NIPS (Non solvent Induced Phase Separation)
Water filtering membranes are a nm thin layer of polymers. To make them mechanically stable they are attached to a porous layer of a a few μm. The properties of this membrane supporting layer have a dramtic effect on the effectiveness ofthe membrane and on its durability. This porous layer is formed during a phase separation process between a polymer ad a solvant (spinodal decomposition).This can be induced either by a temperature change or by the diffusion of the solvant outside of the mmixture or by the diffusion of a non solvent inside the mixture. In all cases, the homogeneous mixture evolved toward a state where polymer rich regions coexist with polymer poor regions. While the mechanism leading to the membrane microstructure are well known it is difficult to link the membrane properties ith the details of the chemical process because of the complicated geometrical structure that are present.
During this PhD we will develop a mathematical model of the phase separation induced by diffusive transport that can be applied to the specificities of membrane formation and we will then take into account hydrodynamic effects to study the later stages of the process. The model will be validated through comparison of numerical predictions with experimental results obtained by a partner group in an ANR collaborative project.
PMC is one of 22 laboratories located at the Ecole polytechnique research centre working on the frontier of knowledge on the major interdisciplinary scientific, technological and societal issues.
Within the Teaching and Research Department of Ecole polytechnique, PMC (Laboratoire de Physique de la Matière Condensée) is a mixed research unit (Ecole polytechnique/CNRS) whose work is organized around two fundamental topics that are the nanosciences and the physics of Irregularity.
We try to understand the solid, liquid or intermediate states (gel, pastes, foams…)of matter (structure, properties, phenomena of sets related to the interactions between the particles that compose it), the condensed matter physics is a science that is upstream of innumerable technological advances.
The PhD student will be enrolled in the PhD programme of the IPP doctoral school that is a multi disciplinary doctoral school which hosts around 900 doctoral students, supervised by more than 800 researchers (including 550 HDRs), in 30 research laboratories (UMR CNRS, INRIA, CEA). The Doctoral contract is funded by a collaborative ANR project that involves three partner laboratories: the PMC, the LIONS at CEA and the IEM (European membrane institute) in Montpellier. The aim of the project is to develop modeling strategies for the description of membrane formation through a comparison between simple experiments and numerical models.
The candidate must have a master degree in engineering and/or physics. The post requires sound knowledge of statistical Physics, Fluid dynamics and scientific computing. A high level of communication skills, both oral and written ( English required) to be able to present at conferences and write articles in scientific publications, and sound knowledge of IT. We are looking for a PhD fellow who will be able to become fully involved with the project, with a thirst for knowledge, a certain independence of thought and strong motivation to develop skills in Physics. In addition, the candidate must be able to work in a team on a multi-disciplinary project.
Applications must include a detailed resume; at least two references (people who may be contracted); a cover letter of one page; a one-page résumé of the dissertation for the master; grades for the master 1 or 2 or the engigneering degree.
We talk about it on Twitter!