title: Nematic-like organization of magnetic mesogen-hybridized nanoparticles.
abstract: A fluid nematic-like phase is induced in monodisperse iron oxide nanoparticles with a diameter of 3.3 nm. This supramolecular arrangement is governed by the covalent functionalization of the nanoparticle surface with cyanobiphenyl-based ligands as mesogenic promoters. The design and synthesis of these hybrid materials and the study of their mesogenic properties are reported. In addition, the modifications of the magnetic properties of the hybridized nanoparticles are investigated as a function of the different grafted ligands. Owing to the rather large interparticular distances (about 7 nm), the dipolar interaction between nanoparticles is shown to play only a minor role. Conversely, the surface magnetic anisotropy of the particles is significantly affected by the surface derivatization.
authors.affiliation: Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg (UMR7504), Strasbourg Cedex 2, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Demortière
authors.forename: Saïwan
authors.initials: S
authors.lastname: Buathong
authors.forename: Benoît P
authors.initials: BP
authors.lastname: Pichon
authors.forename: Pierre
authors.initials: P
authors.lastname: Panissod
authors.forename: Daniel
authors.initials: D
authors.lastname: Guillon
authors.forename: Sylvie
authors.initials: S
authors.lastname: Bégin-Colin
authors.forename: Bertrand
authors.initials: B
authors.lastname: Donnio
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry; D008280:Magnetics; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide