Publication: Preparación de materiales nanoestructurados de matriz polimérica para apantallamiento de ondas electrómagnéticas
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2012
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2012-06-29
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Abstract
Durante los últimos años, se ha hecho un esfuerzo considerable en el diseño, desarrollo y manufactura de materiales nanocompuestos. De entre ellos, los nanocompuestos que combinan las propiedades funcionales de las nanopartículas con las ventajas de las matrices poliméricas han recibido gran atención. En este trabajo se han sintetizado nanoferritas CuxNi(1-x)Fe2O4 (x=0; 0,25; 0,5; 0,75; 1) en el interior de los poros de una sílice comercial mediante el método de plantilla dura (hard template) a dos temperaturas diferentes (700oC y 900oC). Las nanopartículas se caracterizaron mediante Difracción de Rayos X (DRX) y Espectroscopía Infrarroja (FTIR) para determinar su estructura cristalina y composición; y Magnetometría por Vibración de Muestra (VSM) para analizar sus propiedades magnéticas. Posteriormente se incorporaron las partículas en una matriz epoxídica (DGEBA) en diferentes concentraciones (10, 15, 20 y 25%). La caracterización de los materiales compuestos consistió en un estudio de su morfología mediante Microscopía Electrónica de Barrido (SEM); un análisis térmico por Calorimetría Diferencial de Barrido (DSC) y Termogravimetría (TGA); y un estudio de las propiedades mecánicas mediante Small Punch Test (SPT). __________________________________________________________________________________________________________________________
In recent years, a considerable effort has been made on the development, manufacture and design of nanocomposites materials. Among them, materials which combine the functional properties of nanoparticles with the advantages of polymeric matrixes have received great attention. In this work, Cu-Ni mixed nanoferrites (CuxNi(1-x)Fe2O4; x=0; 0,25; 0,5; 0,75; 1) have been synthesized inside the pores of commercial silica template via the nanocasting route at two different sintering temperatures (700oC y 900oC). The as-synthesized silica/ferrite materials were characterized by X Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Vibrating Sample Magnetometry (VSM) in order to determine their crystalline structure, composition and magnetic behaviour. Moreover, three silica/ferrite compositions were chosen to be dispersed in an epoxy matrix (Diglycidyl ether bisphenol A, DGEBA) at different weight radios (10, 15, 20 and 25%) and their morphology was studied by Scanning Electron Microscopy (SEM). The thermal and mechanical properties of the composites were investigated by Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC) and Small Punch Test (SPT).
In recent years, a considerable effort has been made on the development, manufacture and design of nanocomposites materials. Among them, materials which combine the functional properties of nanoparticles with the advantages of polymeric matrixes have received great attention. In this work, Cu-Ni mixed nanoferrites (CuxNi(1-x)Fe2O4; x=0; 0,25; 0,5; 0,75; 1) have been synthesized inside the pores of commercial silica template via the nanocasting route at two different sintering temperatures (700oC y 900oC). The as-synthesized silica/ferrite materials were characterized by X Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Vibrating Sample Magnetometry (VSM) in order to determine their crystalline structure, composition and magnetic behaviour. Moreover, three silica/ferrite compositions were chosen to be dispersed in an epoxy matrix (Diglycidyl ether bisphenol A, DGEBA) at different weight radios (10, 15, 20 and 25%) and their morphology was studied by Scanning Electron Microscopy (SEM). The thermal and mechanical properties of the composites were investigated by Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC) and Small Punch Test (SPT).
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Materiales nanocompuestos, Nanotecnología, Polímeros, Ondas electromagnéticas