Study of the non-covalent coating of graphene-coated cobalt magnetic nanoparticles with pyrene-tagged dendritic poly(vinylidene fluoride)

Enrique Folgado (1) , Marc Guerre (1) , Nidhal Mimouni (2) , Vincent Collière (2) , Christian Bijani (2) , Kathleen Moineau-Chane Ching (2) , Anne-Marie Caminade (2) , Vincent Ladmiral (1) , Bruno Ameduri (1) , Armelle Ouali (1)

1 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 LCC - Laboratoire de chimie de coordination

This study investigates the non-covalent coating of cobalt magnetic nanoparticles (MNPs) involving a graphene surface with pyrene-tagged dendritic poly(vinylidene fluoride) (PVDF). Dendrimers bearing a pyrene moiety were selected to play the role of spacers between the graphene surface of the MNPs and the PVDF chains, the pyrene unit being expected to interact with the surface of the MNPs. The pyrene-tagged dendritic spacer 11 decorated with ten acetylenic units was prepared and fully characterized. Azido-functionalized PVDF chains were then grafted onto each branch of the dendrimer using Huisgen’s [3 + 2] cycloaddition reaction. Next, the association of the resulting pyrene-tagged dendritic PVDF 13 with commercially available Co/C MNPs by π -stacking interactions was studied by fluorescence spectroscopy. Evaluated were the stability of the π -stacking interactions when the temperature increased and the reversibility of the process when the temperature de- creased. Also, hybrid MNPs were prepared from pyrene-tagged dendrimers decorated either with acetylenic functions ( 11 ) or with PVDF branches ( 13 ), and they were characterized by transmission electron microscopy and comparative elemental analysis was carried out with naked MNPs.

Mots clés: Dendrimers; Magnetic nanoparticles; Pyrenes; Poly(vinylidenefluoride); π-stacking; pyrenes; poly(vinylidenefluoride); magnetic nanoparticles; dendrimers

Domaines: Polymères; Matériaux

Enrique Folgado, Marc Guerre, Nidhal Mimouni, Vincent Collière, Christian Bijani, et al.. Study of the non-covalent coating of graphene-coated cobalt magnetic nanoparticles with pyrene-tagged dendritic poly(vinylidene fluoride). ChemPlusChem, 2019, 84 (1), pp.78-84. ⟨10.1002/cplu.201800471⟩. ⟨hal-01996630⟩