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Reference : UMR6303-CHRLAB-001
Workplace : DIJON
Date of publication : Thursday, January 31, 2019
Type of Contract : FTC Scientist
Contract Period : 6 months
Expected date of employment : 1 April 2019
Proportion of work : Full time
Remuneration : arround 2000 euros per month (after tax)
Desired level of education : PhD
Experience required : Indifferent
Colloids are common in our everyday life starting from our own body to construction materials. They are composed of nanometric or micrometric particles dispersed in a gas, a liquid or a solid. Colloids are generally shape, size and charge polydisperse. In theoretical studies polydispersity is often ignored, as solving the single-sized or monodisperse problem is often sufficiently complicated. However, as real experiments are always performed on at least slightly polydisperse systems it is essential to rationalize the effects of this pervasive phenomenon which can have profound consequences on the phase behavior.
In a recent theoretical work , in collaboration with the experimental teams of B. Cabanes and L. Goehring, some clear progresses have been obtained in the understanding of these systems by combining Monte Carlo simulations at the level of the colloids only with the calculation of the effective pair potentials based on various developed techniques which allow to both account for the surface charge regulation of the colloids and their polydispersity [2-3]. In particular, these simulations allowed to reproduce the phase behavior observed for various industrially produced aqueous silica nanoparticle dispersions, including the fractionation of the latter in several crystalline phases .
The main aim of this project is to consolidate these recent findings by performing, with these original and predictive numerical tools, an intensive simulation campaign to prospect for new colloidal crystal phases. A second goal is to develop and improve the present Monte Carlo simulation code to allow either the simulation on very large systems or the calculation of the exact phase boundaries.
 Bareigts G.; Interactions and Structures in Polydisperse Suspensions of Charged Spherical Colloids, PhD Thesis, Dijon, France, 14 th of December 2018.
 Bareigts, G.; Labbez, C.; Jellium and Cell Model for Titratable Colloids with Continuous Size Distribution, Journal of Chemical Physics, 149, 244903, 2018.
 Bareigts, G.; Labbez, C.; Effective Pair Potential between Charged Nanoparticles at High Volume Fractions, Physical Chemistry Chemical Physics, 19(6), p. 4787-4792, 2017
 Cabane, B.; Li, J.; Artzner, F.; Botet, R.; Labbez, C.; Bareigts, G.; Sztucki, M.; Goehring, L.; Hiding in Plain View: Colloidal Self-Assembly from Polydisperse Populations, Physical Review Letter, 116(20), 208001, 2016
- Monte Carlo simulations
- Mean field theory calculations
- Simulation result analysis
- Code developpment (Fortran, C)
Very good skills in:
- Statistical mechanics
- Programming (Fortran, C/C++)
- Monte Carlo techniques
- Mean Field Theory
You will be expected to show initiative, imagination and to be highly motivated.
The Laboratory Interdisciplinaire Carnot de Bourgogne (ICB), jointly operated by CNRS, University of Burgundy and University of Technology Belfort-Montbéliard, counts 300 Physicists, Chemists, Engineers and Technicians in Dijon, Le Creusot, Châlon-sur-Saône & Belfort (Sevenans) campuses. They develop new optical functionalities and new materials for industry, medicine and telecommunications.
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