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Application of Click chemistry for the elaboration of hybrid multilayer architectures – MULTICLICK

Submission summary

The 'Polymer Materials Engineering' (IMP, UMR 5223, Lyon) and the 'Léon Brillouin Laboratory' (LLB, UMR 12, Saclay) are the two CNRS partners involved in this highly interdisciplinary project. Electrostatically driven LbL self-assembly is the most studied and applied technique for the elaboration of multilayer coatings. Although more developed on planar (2D) substrates, significant efforts have been focused on the elaboration of multilayer architectures on spherical (3D) substrates. This process relies on the specific and sequential interactions between a 2D or 3D substrate with oppositely charged polyelectrolytes. It allows for an easy tuning of the properties/applications of these multilayer architectures from the choices of the substrate, the nature of the polyelectrolytes, counter-ions and various organic, inorganic or bioinspired charged architectures. Even if it generally involves environmentally friendly water based processes, LbL assembly using charged and polar materials is also a main limitation of this technology. Indeed, counter-ion mobility and reversibility of the electrostatic interactions must be considered. Also, this process excludes an important part of macromolecular materials, i.e. uncharged polymers. This can be explained by the specificity and the easy processing of this method which mainly relies on consecutive immersions of charged substrates in aqueous solutions of oppositely charged polymers/architectures. The proposal associated to this request for ANR funding is based on an innovative method for the elaboration of organic and hybrid multilayer thin films and nanoparticles, each layer being associated covalently by click chemistry. This versatile chemistry is based on the catalyzed irreversible cycloaddition of an alkyne (R-CCH) and an azide (R-N3), yielding a 1,2,3-triazole aromatic ring. This chemical pathway is playing an important role in the evolution of functional macromolecular materials. Indeed, its high specificity, selectivity and quantitativity, the absence of residuals and by-products, the high tolerance in aqueous, hydro-alcoholic or organic media will allow this project to be successful. Linear macromolecules having alkyne or azide functionalities randomly distributed along their backbone, and platinum nanoparticles having alkyne functionalities covering their surface will be prepared as the organic and inorganic parts of the targeted 2D and 3D hybrid multilayer architectures. Sequential click chemistry processes will be then applied to covalently bound the elementary bricks described above from the 2D or 3D substrates. Beside the characterization techniques fully accessible at the IMP and LLB laboratories (e.g. NMR, UV, IR, SEC, TGA, DSC, ellipsometry, SFM, TEM, SEM, XPS, DLS...) neutron scattering and reflectivity experiments will be performed for the detailed characterization of the different multilayer architectures prepared, using contrast matching between different alternating layer systems. These 2D and 3D processes will be then extended to other objects issued from a tailored library of azide and alkyne functionalized organic and inorganic components. Compared to the usual methods for the elaboration of multilayer thin films, the use of click chemistry will significantly expand the chemical nature and the diversity of the components of these new coatings as well as their applications/properties. These objectives will be achieved by the close and complementary collaboration between the young researchers organized as a team for this project. This project will imply an interdisciplinary methodology as well as realistic and clearly identified objectives. This ambitious and outstanding project will have a significant impact in the field of functional coatings and hybrid nanoparticles and will be a valuable contribution in term of innovation to the themes developed by the IMP and the LLB. This highly benefic collaborations will lead in the future to other joined actions involving research, teaching, mobility and exchanges. The combination of the partners involved will allow for the development of an innovative approach impossible to realize without such complementary synergies. The defined project will be conducted in a privileged scientific environment involving close collaborations (e.g. mobility and meetings...) between outstanding research laboratories in the field of polymer materials. These will be important assets for the professional perspective of the future recruited post-doctorate.

Project coordination

Eric DROCKENMULLER (Université)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

Help of the ANR 138,000 euros
Beginning and duration of the scientific project: - 36 Months

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