Synthetic hybrid self-assemblies of nanocrystals

Giovedì 12 dicembre 2024, con inizio alle ore 11:00, presso l'Aula E del DFA, la Dr Valérie Marchi (Institut des Sciences Chimiques, CNRS, Univ. Rennes 1, France) terrà un seminario dal titolo Synthetic hybrid self-assemblies of nanocrystals.

Il seminario si svolge nell’ambito delle attività del Dottorato in Scienza dei Materiali e Nanotecnologie.

La Prof.ssa Valérie Marchi sarà ospite del DFA per una settimana nell'ambito del Progetto di mobilità internazionale di risorse studenti e docenti (Erasmus+ mobility for study) e l’agreement esistente fra l'Università di Rennes 1 ed il DFA.

Abstract. The aim is to bring out new collective optical properties arising from couplings between individual metallic or semiconductor nanocrystals. After a review of the main forces of interaction between particles, we will present the different strategies for assembling nanocrystals. We will present the fabrication of synthetic hybrid self-assemblies formed from biological assemblies (lipids and proteins) and nanocrystals. Precise control of nanocrystal morphology, optimized surface chemistry and formulation then enable 3D assemblies of gold and semiconductor nanorods to be obtained using a physical method of kinetically controlled water drying on a textured solid support. Nanocrystal assemblies can also be directed using artificial proteins. We will show the first examples of reversible assembly of metallic and semiconducting nanocrystals.

References.

1. A. Dif, E. Henry, F. Artzner, M. Baudy-Floc’h, M. Schmutz, M. Dahan and V. Marchi-Artzner, Journal of the American Chemical Society, 2008, 130, 8289–8296.
2. A. Dif, F. Boulmedais, M. Pinot, V. Roullier, M. Baudy-Floc’h, F. M. Coquelle, S. Clarke, P. Neveu, F. Vignaux, R. L. Borgne, M. Dahan, Z. Gueroui and V. Marchi-Artzner, J. Am. Chem. Soc., 2009, 131, 14738–14746.
3. E. Henry, A. Dif, M. Schmutz, L. Legoff, F. Amblard, V. Marchi-Artzner and F. Artzner, Nano Lett., 2011, 11, 5443–5448.
4. T. Bizien, J.-C. Ameline, K. G. Yager, V. Marchi and F. Artzner, Langmuir, 2015, 31, 12148–12154.
5. K. L. Gurunatha, A. C. Fournier, A. Urvoas, M. Valerio-Lepiniec, V. Marchi, P. Minard and E. Dujardin, ACS Nano, 2016, 10, 3176–3185.

Bio. Valerie Marchi graduated in Condensed Matter, Chemistry and Organization at University Pierre Marie Curie (Paris) in 1994. Since then she consolidated her experience in the field of Molecular recognition between complementary lipidic membranes achieving a full position as Research scientist (C.N.R.S.), Collège de France, Paris in 1998. From 2003 She is an international expert for the European Research Council (ERC) and for the IFCPRA (Indo-french centre for the promotion of advanced research) national Expert for the ANR, the C’Nano Ile de France, PhD and HDR defenses jury member (3/year).Since 2009, she is the Research director (C.N.R.S.) (section 12) at the institut de Sciences chimiques de Rennes, Université Rennes 1, UMR 6226 CNRS where she is currently working.

Main topics of the research activity in Rennes. V. Marchi's group (SCR, Rennes) has an expertise in synthesis, chemical functionnalization and characterization of nano-objects as well as self-assembling of nanoparticles. Recent works of this group were oriented toward Biology-Nanoscience interface (biofunctionnalisation of nanoparticle, peptide directed nanotube assembly etc). This group was involved in several papers demonstrating the possibility to target and modulate the self- assembling of targeted proteins such as tubulin or actin using protein-nanoparticle hybrids with a controlled stoichiometry, using quantum dots (Nanoletters 2009, JACS 2009, Nanoletters 2011) or magnetic nanoparticles (Nature Nanotech in press). This group also investigated gold nanorods or quantum rods structured assemblies obtained with short peptidic ligands by SAXS and SEM (ACS Nano 2012 and Small 2014). The group has also explored the ability of the nanoparticles to activate biocatalysts such as hydrogenases to induce photoelectrochemical reactions at the surface of the nanoparticles (Chem. Comm. 2014, PCCP 2013, Chem. Comm 2015, Bioelectrochemistry 2015, Elect. Comm 2018). Finally her research focuses currently on the self-assemblies of nanoparticles driven by synthetic complementary proteins (ACS Nano 2016) and the optical properties of these nanostructured materials (Langmuir 2015, Nano letters 2011). The group develops also original synthesis of bioactivated gold nanoclusters for biomedical applications.