Contact : Anne Chantal Gouget-Laemmel
Participants : Anne Chantal Gouget-Laemmel, François Ozanam
One of the challenges in catalysis - a major pillar of green chemistry - is the recycling and reuse of catalysts that are often based on expensive and rare metals. Among the different solutions, the supported catalysis allows the attachment of catalysts on a solid support which, once engaged in a chemical reaction in liquid phase, can be recovered by simple filtration. Our approach is to use macroporous silicon with a very large specific surface as a substrate for robust and reproducible bonding of functional molecular layers via Si-C bonds followed by post-modification by catalysts. We particularly study the grafting of methacrylate polymers by SI-RDRP (Surface-Initiated Reversible Deactivation Radical Polymerization) terminated by different chemical functions to load a high concentration of two types of salen catalysts based on transition metals. The ultimate goal is to make multi-catalysis where several reactions could be achieved in a single step.
(left) scanning electron microscopy image of a 21 µm thick porous silicon layer. (right) schematic of the grafted molecular structure having two catalytic centers.
Recent PhD theses : Nacim Zidelmal (Charmmmat, 2018), Rafaela Bechara (Ecole Polytechnique, 2024)
Postdocs : Erigène Bakangura (Charmmmat, 2020-2021)
Collaborations : ICMMO (Orsay), INSA/Greman (Tours)
Funding : Charmmmat
Recent publications :
[Bakangura2022] Bakangura, E., Roger, P., Soares, R. S. B., Mellah, M., Barroca-Aubry, N., Gouget-Laemmel, A. C., Ozanam, F., Costa, L., Baltaze, J. P., Schulz, E., Post-Modification of Copolymers Obtained by ATRP for an Application in Heterogeneous Asymmetric Salen Catalysis, MOLECULES, 2022, 27, 4654
https://doi.org/10.3390/molecules27144654
[Gouget-Laemmel2023] Gouget-Laemmel, A. C., Zidelmal, N., Soares, R. S. B., Barroca-Aubry, N., Dragoe, D., Costa, L., Lepoittevin, B., Salmi-Mani, H., Mellah, M., Henry-de-Villeneuve, C., Ozanam, F., Schulz, E., Roger, P., Direct Quantitative Characterization of Polymer Brushes Obtained by Surface-Initiated ATRP on Silicon, ACS APPLIED POLYMER MATERIALS, 2023, 5, 517-528
https://doi.org/10.1021/acsapm.2c01632
[Zidelmal2018] Zidelmal, N., Aubry-Barroca, N., Lepoittevin, B., Mellah, M., Costa, L., Ozanam, F., Gouget-Laemmel, A. C., Schulz, E., Roger, P., Synthesis, characterization and catalytic properties of salen-containing polymers obtained by atom transfer radical polymerization, POLYMER, 2018, 135, 261-270
https://doi.org/10.1016/j.polymer.2017.12.019