title: Inorganic-organic nanocomposites based on sol-gel derived magnesium fluoride.
abstract: Monodispersed magnesium fluoride nanoparticles are utilized for the first time to prepare transparent inorganic-organic nanocomposite materials with improved mechanical properties. The fluorolytic sol-gel synthesis route has been modified for the preparation of monodispersed magnesium fluoride nanoparticles with a size of 2-3 nm. MgF(2) particles are effectively stabilised against agglomeration by phosphonic acids, which strongly bind to the particles and lead to an increased compatibility of the inorganic particles with the organic polymers. This way, highly transparent nanocomposite materials with up to 20 wt% magnesium fluoride in different acrylates are obtained, featuring high dispersion of MgF(2) particles in the polymer matrix and an increased hardness by the factor of 2. The nature of interaction between phosphonic acids and magnesium fluoride is thoroughly investigated by IR and NMR showing a monodentate coordination of phosphonates to the particle's surface.
authors: Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Straße 2, 12489, Berlin, Germany.
authors: Johannes
authors: J
authors: Noack
authors: Larissa
authors: L
authors: Schmidt
authors: Hans-Jürgen
authors: HJ
authors: Gläsel
authors: Monika
authors: M
authors: Bauer
authors: Erhard
authors: E
authors: Kemnitz
mesh_terms: D005459:Fluorides / Q000737:chemistry*; D007287:Inorganic Chemicals / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009930:Organic Chemicals / Q000737:chemistry*; D010316:Particle Size; D044367:Phase Transition; D012996:Solutions; D013499:Surface Properties
chemical_list: D007287:Inorganic Chemicals; D046911:Macromolecular Substances; D017616:Magnesium Compounds; D009930:Organic Chemicals; D012996:Solutions; C031288:magnesium fluoride; D005459:Fluorides