The extension of the project aims to reinforce the dynamics initiated by the Labex during the period 2012-2019 on transversal research on interactions at fluid-solid interfaces by opening up to research on the durability of interfaces and the control of interactions.

Compared to the first project, the number of subjects is reduced and focuses on transversal research involving people from different research groups, which is the aim and originality of this proposal. The proposed project is based on the three components of the general problem of interactions at fluid-solid interfaces, while relying on the results and perspectives of Labex I to offer a coherent but innovative scientific scope. The first subject focuses on the effect of the fluid and the environment on the first layers of material. The second subject deals with approaches aimed at improving the functions or properties of interfaces by structuring surfaces. Finally, the third subject deals with the effect of solid and fluid boundary interactions on the first layers of fluid. The three subjects are in fact linked and research at their interfaces is possible as described below. In addition to understanding and modeling the interaction mechanisms at the interfaces, particular attention is paid to the durability of the interfaces and to the control of interactions. Durability is a key point for the applicability of new interfaces in real systems and the control of interactions by functionalization or by actuators is a means of improving the efficiency of industrial systems.

The project will rely on the many tools for analyzing and structuring surfaces, in particular the recently acquired FIB, available at the Pprime Institute. The GAP Equipex project and the Prométée platform provide facilities for the analysis of materials and their interfaces under extreme conditions representative of aeronautical applications. These facilities will be essential for carrying out the proposed research.

In the initial Labex project, the content of all work-packages was initially defined. More recently, calls for projects have been launched to promote new knowledge in the research developed. During the second Labex programming (2020-2024), which is a full call for proposals, support will be balanced between the consolidation of certain conclusive interdisciplinary actions initiated during the previous program and the promotion of certain questions to come.