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Reference : UMR5306-MARLEM-003
Workplace : VILLEURBANNE
Date of publication : Tuesday, June 16, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 November 2020
Proportion of work : Full time
Remuneration : Gross salary between 2648 and 2800 € per month, depending on experience (less than 2 years after PhD)
Desired level of education : PhD
Experience required : Indifferent
By foaming (incorporating gas bubbles) and solidifying a hydraulic binder (cement, plaster, geopolymer, calcium phosphate), one can make porous mineral materials combining lightness, low raw material content, and functional properties like thermal insulation (for building materials) or high specific area (materials for waste treatment or bone repair). In addition, they are easier to process as they solidify without heating by dissolution-precipitation.
However, the final properties of the materials (mechanical strength, thermal conductivity, specific area, etc) highly depend on their structure, in particular pore connectivity and homogeneity. Both aspects are controlled by the balance between the stability of the soap films that make the foam, and their solidification by mineral setting. In particular, while the fresh foam structure can be controlled by surfactant charge (Gonzenbach, Angew. Chem. Int. Ed., 2006, Lesov, J. Colloid Interface Sc., 2014), its evolution upon solidification remains largely unknown.
The objective of the postdoc is therefore to probe how mineral precipitation occurs in a single soap film, the elementary unit of an aqueous foam: precipitation kinetics, shape and interactions between precipitates… In particular, we will investigate how these parameters depend on the solution physico-chemistry (mineral-surfactant interaction, ionic strength) and on the highly confining film geometry which may affect reactant transport. In parallel, we will assess the soap film stability (film lifetimes) for the various experimental conditions.
- Setting and running experiments
- Data analysis
- Writing and publishing results
Experimental PhD in soft matter physics, ideally with knowledge in foams, colloid physicochemistry or mineral materials. Maximum 2 year experience after PhD, the candidate must not have defended his/her PhD in the hosting laboratory.
The postdoc will work in Institut Lumiere Matiere (Institute of Light and Matter, CNRS-Université Lyon 1) on la Doua campus in Villeurbanne, in the Liquids and interfaces team.
Funding from Fondation de la Maison de la chimie. For funding reasons, the candidate will be selected mid-July, for a starting date ideally in the last quarter of 2020.
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