title: Synthesis and studies of water-soluble Prussian Blue-type nanoparticles into chitosan beads.
abstract: A new approach to the synthesis of highly stable aqueous colloids of coordination polymer nanoparticles was developed by using water-soluble chitosan beads as template and as stabilizing agent. The method consists in the synthesis of nanocomposite beads containing cyano-bridged coordination polymer nanoparticles via step-by-step coordination of the metal ions and the hexacyanometallate precursors into the chitosan pores and then water solubilization of these as-obtained nanocomposite beads. We obtain a large range of M(2+)/[M'(CN)(6)](3-)/chitosan (where M(2+) = Ni(2+), Cu(2+), Fe(2+), Co(2+), Mn(2+) and M' = Fe(3+) and Cr(3+)) nanocomposite beads and their respective aqueous colloids containing coordination polymer core/chitosan shell nanoparticles. The nanocomposite beads and the corresponding aqueous colloids were studied by Infrared (IR) and UV-Vis spectroscopy, nitrogen sorption (BET), Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM) and magnetic analyses, which reveal the presence of homogeneously dispersed uniformly-sized cyano-bridged coordination polymer nanoparticles. The detailed studies of the static and dynamic magnetic properties of these nanoparticles show the occurrence of a spin-glass like behavior presumably produced by intra-particle spin disorder due to the low spin exchange energy characterizing these materials.
authors.affiliation: Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1, Chimie Moléculaire et Organisation du Solide, Université Montpellier II, Place E. Bataillon, 34095 Montpellier cedex 5, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Folch
authors.forename: Joulia
authors.initials: J
authors.lastname: Larionova
authors.forename: Yannick
authors.initials: Y
authors.lastname: Guari
authors.forename: Karine
authors.initials: K
authors.lastname: Molvinger
authors.forename: Carlos
authors.initials: C
authors.lastname: Luna
authors.forename: Claudio
authors.initials: C
authors.lastname: Sangregorio
authors.forename: Claudia
authors.initials: C
authors.lastname: Innocenti
authors.forename: Andrea
authors.initials: A
authors.lastname: Caneschi
authors.forename: Christian
authors.initials: C
authors.lastname: Guérin
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry; D005295:Ferrocyanides / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry / Q000648:ultrastructure; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D012995:Solubility; D014867:Water / Q000737:chemistry
chemical_list: D003102:Colloids; D005295:Ferrocyanides; D014867:Water; D048271:Chitosan; C000170:ferric ferrocyanide