O.R. MNM │Multifunctional Nanostructured Materials

Manager : Virgille TRANNOY

Description

The research activities that we propose to develop in the framework of this research operation (R.O.) are in the continuity of the work carried out during the 2014-2018 five-year period, namely the elaboration and study of the physical properties of multifunctional nanomaterials. Through the synthesis and consolidation techniques of nanopowders as well as the structural and magnetic characterization techniques implemented, three distinct and complementary research areas are explored.

Nano-SmArc structuring project (video of Labex SEAM)

The first of these fields concerns the study of the nucleation and growth stages of particles during the synthesis of nano-objects. Two systems are mainly explored. On the one hand, we are continuing the work on the influence of external constraints (magnetic field, ultrasound,…) applied to the reaction medium on the morphology and size of nanoparticles. On the other hand, we have determined the conditions for obtaining a new phase with promising piezoelectric properties by hydrolysis in polyol medium. This last work was carried out within the framework of the ANR 2017 SYMPATI project in which we were partners.
 
The second field concerns the study of sintering phenomena of synthesized nanopowders. In particular, we aim at elaborating nanostructured bulk materials with controlled density and controlled grain size and organization. The objective here is to confer to the massive materials, at a macroscopic scale, the remarkable physical properties related to the nanometric character of the initial particles. Here also, we deepen the activities carried out until now concerning the flash sintering (Spark Plasma Sintering) assisted by a magnetic field. In parallel, work on the shaping of a new intermetallic phase is carried out in the framework of a collaboration with an industrial partner through a thesis (third thesis financed by the same industrial partner in 10 years). Finally, a last axis of work concerning the consolidation of nanopowders based on aluminum oxide in order to obtain luminescent and transparent ceramics is carried out. The objective here is to determine the experimental factors allowing to obtain a dense material with a high density of grain boundaries. This activity constitutes an opening towards the O.R. PRET of the MÉCAMÉTA axis. 


Finally, the third and last field of research developed within this R.O. concerns the study of the relationship between microstructure and physical properties of multifunctional nanostructured materials developed by controlling their structural and morphological properties. The underlying objective is to determine the nature of the microstructural parameters at the origin of the physical properties (ferromagnetic and/or piezoelectric) of the studied materials and to optimize these last ones by controlling the parameters. In the case of multifunctional nanostructured materials, we are also interested in the nature of the couplings between the functionalities in order to better control these phenomena. Ces différents points sont abordés selon trois thématiques de recherche. La première de ces thématiques porte sur l’influence de la structure et de la morphologie des nanopoudres magnétiques sur leurs propriétés physiques. Pour la seconde, nous nous intéressons à la nature des interactions de ces mêmes nanopoudres lorsqu’elles sont plus ou moins diluées au sein d’un composé massif ainsi qu’aux effets de couplage à l’interface entre les inclusions et la matrice dans le cas de matériaux composites. La troisième porte sur l’influence des propriétés microstructurales de composés intermétalliques sur les propriétés de transport électrique et thermique.

Outstanding results

Optimization of thin film microstructuring

Nguyen AN, et al. Materials 13 (2020) 1342

Effect of doping and irradiation on ceramics MgAl₂O₄

Spiridigliozzi H, et al. J. Eur. Ceram. Soc. 40 (2020) 3215-21

Influence of flash sintering on the microstructure and mechanical properties of nTiC

Teber A, et al. Int. J. Refract. Met. H. 30 (2012) 64-70 (publication commune PPANAM/MINOS)

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