title: Self-assembly mechanism of nanoparticles of Ni-based Prussian Blue analogues at the air/liquid interface: a synchrotron X-ray reflectivity study.
abstract: Prussian Blue analogue (PBA) nanoparticles can be self-assembled at air/liquid interfaces to build novel materials with interesting magnetic features. Herein, we study the influence of the size of PBA Cs0.4 Ni[Cr(CN)6 ]0.9 and K0.25 Ni[Fe(CN)6 ]0.75 nanoparticles on the self-assembly behavior by synchrotron X-ray reflectivity. Both nanoparticles show similar Z-potential values. The phospholipid dipalmitoylphosphatidylcholine and the amino surfactant dimethyldioctadecylammonium have been used as Langmuir monolayers to anchor the PBA nanoparticles and study the interplay of forces directing the self-assembly of the nanoparticles at the surfactant/liquid interface. Whereas Cs0.4 Ni[Cr(CN)6 ]0.9 nanoparticles with a diameter of 8 nm form an incomplete layer at the surfactant/water interface, the larger K0.25 Ni[Fe(CN)6 ]0.75 nanoparticles with a diameter of 20 nm generate complete layers that can be stacked to one another. The size of the PBA nanoparticles is the main parameter determining the final arrangement at the air/liquid interface, due to the different extent of interparticle interaction. This study aims at the rationale design of PBA nanoparticles for an effective interfacial self-assembly, ultimately leading to functional materials.
authors.affiliation: Max Planck Institute of Colloids and Interfaces, Department of Interfaces, Science Park Golm, 14476, Potsdam (Germany). jjginer@uco.es.|University of Córdoba, Department of Physical Chemistry, Campus de Rabanales, 14014 Córdoba (Spain). jjginer@uco.es.|Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia, San Sebastián (Spain). jjginer@uco.es.
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Giner-Casares
authors.affiliation: Instituto de Ciencia Molecular, Universidad de Valencia, Calle Catedrático José Beltrán 2, 46980 Paterna (Spain).
authors.forename: Miguel
authors.initials: M
authors.lastname: Clemente-León
authors.affiliation: Instituto de Ciencia Molecular, Universidad de Valencia, Calle Catedrático José Beltrán 2, 46980 Paterna (Spain).
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
authors.affiliation: Max Planck Institute of Colloids and Interfaces, Department of Interfaces, Science Park Golm, 14476, Potsdam (Germany).
authors.forename: Gerald
authors.initials: G
authors.lastname: Brezesinski
mesh_terms: D005295:Ferrocyanides / Q000737:chemistry*; D053758:Nanoparticles; D009532:Nickel / Q000737:chemistry*; D017356:Synchrotrons; D014965:X-Rays
chemical_list: D005295:Ferrocyanides; D009532:Nickel; C000170:ferric ferrocyanide
keywords: nanoparticles; phospholipids; supramolecular chemistry; surfactants; synchrotron radiation