Magnetite core-shell nano-composites with chlorine functionality: preparation by miniemulsion polymerization and characterization

Magnetic composite particles with a magnetic core consisting of superparamagnetic iron oxide and a cover layer of hydrophobic polyvinylbenzylchloride are described. The magnetite was prepared by precipitation starting with mixed iron II and iron III salts and coating of the solid with oleic acid. The coating is conducted via the liquid–liquid phase transfer. Thereby oleic acid adsorbed on the magnetite surface. In a second step the oleic acid treated magnetite was coated with polyvinylbenzylchloride in a miniemulsion polymerization to get a protective layer. The obtained magnetite core-shell nano-composites with chlorine functionality were characterized by different methods: particle size measurement, acid treatment, iron content, morphology and elemental profiles across the composite particles diameter. The test result reveals the binding of the iron oxide inside the composites which can be also recognize in TEM pictures.

[1]  H. Toma,et al.  Preparation and characterization of (3-aminopropyl) triethoxysilane-coated magnetite nanoparticles , 2004 .

[2]  A. Kholmetskii,et al.  A novel route for the preparation of magnetic fluids , 2005 .

[3]  P. E. Laibinis,et al.  Polymerization of Olefin-Terminated Surfactant Bilayers on Magnetic Fluid Nanoparticles , 2000 .

[4]  Filimonov,et al.  Physical and Chemical Properties of Magnetite and Magnetite-Polymer Nanoparticles and Their Colloidal Dispersions. , 1999, Journal of colloid and interface science.

[5]  K. Müllen,et al.  Surface Functionalized ZnO Particles Designed for the Use in Transparent Nanocomposites , 2005 .

[6]  T. Banert,et al.  Preparation of highly filled super-paramagnetic PMMA-magnetite nano composites using the solution method , 2006 .

[7]  K. Landfester.  Polyreactions in miniemulsions. , 2001 .

[8]  S. K. Awasthi,et al.  Initial droplet size distribution in miniemulsion polymerization , 2003 .

[9]  R. A. Pereira,et al.  X-ray studies on compositions of polyurethane and silica , 2001 .

[10]  M. R. Pereira,et al.  Polymer–filler interactions and mechanical properties of a polyurethane elastomer , 2000 .

[11]  H. Gu,et al.  Oleic acid coating on the monodisperse magnetite nanoparticles , 2006 .

[12]  C. Fee,et al.  Preparation of magnetically susceptible polyacrylamide/magnetite beads for use in magnetically stabilized fluidized bed chromatography. , 1997, Biotechnology and bioengineering.

[13]  Markus Antonietti,et al.  Polyreactions in miniemulsions , 2002 .

[14]  C. D. Vasconcelos,et al.  Synthesis and characterization of poly(ethyl methacrylate-co-methacrylic acid) magnetic particles via miniemulsion polymerization , 2006 .

[15]  Magnetic hydrophilic methacrylate-based polymer microspheres designed for polymerase chain reactions applications. , 2004, Journal of chromatography. B, Analytical technologies in the biomedical and life sciences.

[16]  Jun Li,et al.  Preparation of Fe3O4/polystyrene composite particles from monolayer oleic acid modified Fe3O4 nanoparticles via miniemulsion polymerization , 2009 .

[17]  A. G. Ramazanova,et al.  Adsorption of surfactants on superfine magnetite , 2002 .

[18]  Yen Wei,et al.  Electromagnetic functionalized polyaniline nanostructures , 2005 .

[19]  H. Schmid,et al.  Liquid–liquid phase transfer of magnetite nanoparticles , 2009 .

[20]  D. Briggs,et al.  Practical surface analysis: By auger and x-ray photoelectron spectroscopy , 1983 .

[21]  I. Dumazet-Bonnamour,et al.  Colloidal dispersion of magnetite nanoparticles via in situ preparation with sodium polyoxyalkylene di-phosphonates , 2000 .

[22]  Frank Caruso,et al.  Magnetically directed self-assembly of submicron spheres with a Fe3O4 nanoparticle shell , 2002 .

[23]  K. Landfester,et al.  Magnetic Polystyrene Nanoparticles with a High Magnetite Content Obtained by Miniemulsion Processes , 2003 .

[24]  Michael D. Kaminski,et al.  Preparation and characterization of hydrophobic superparamagnetic magnetite gel , 2006 .

[25]  M. Winnik,et al.  Fluorescent polymer particles by emulsion and miniemulsion polymerization , 2003 .

[26]  D. Ryan,et al.  Formation and characterization of superparamagnetic cross-linked high amylose starch , 2000 .

[27]  Markus Antonietti,et al.  Encapsulation of magnetite in polymer particles via the miniemulsion polymerization process , 2001 .

[28]  L. Falkenburg,et al.  Polymerization of styrene in the presence of fatty acid methyl esters , 1952 .

[29]  W. Tolberg,et al.  Peroxide catalyzed polymerization of styrene in pure fatty methyl esters , 1953 .