materiales cerámicos. síntesis y procesado - Universidad ...

VIII Congreso Nacional de
Materiales - Valencia 2004
075 In-depth profile analysis by glow discharge – time of fight mass spectrometry
N. Bordel 1 , R. Pereiro 2 , J. Pisonero 1 , B. Fernández 2 , A. Menéndez 2 , A. Sanz-Medel 2
1 Departamento de Física. Universidad de Oviedo. C/ Calvo Sotelo s/n, 33007 Oviedo.
2 Departamento de Química Física y Analítica. Universidad de Oviedo. C/Julian Clavería, 33006 Oviedo.
The suitability of a glow discharge time-of-flight mass spectrometer (GD-TOFMS) developed in our group for the direct analysis of coated
samples was examined. The GD-TOFMS system powered with direct current was employed to analyse conducting coated samples and
the qualitative and quantitative profiles were obtained. Also, by powering the equipment with radiofrequency, the system was used to
analyse non-conducting materials (in particular glasses). The developed GD-TOFMS offers several important analytical features,
including a good long-term stability, high mass resolving power, and good precision for isotope ratio measurements. Moreover, the high
acquisition velocity of the complete mass spectrum of any sample by using the time of flight mass spectrometer offers a great advantage
for the analyse of unknown samples.
143 Preparción y caracterización de bicapas antireflectivas de ZnO/ZnS obtenidas por spray pirolisis
M.C. Lópeza* , J.P. Espinosb , D. Leinena , F. Martina ,J.R. Ramos-Barradoa 3 Laboratorio de Materiales&Superficie (Unidad asociada al CSIC). Departamentos de Física Aplicada e Ingeniería Química.
Facultad de Ciencias. Universidad de Málaga. E-29071 Málaga (Spain)
b . Instituto de Ciencias de Materiales. CSIC. Isla de la Cartuja. Sevilla
Mediante la técnica de Spray Pirólisis Químico, se han obtenido bicapas ZnO/ZnS para ser usadas como capas antireflexivas en células
solares, utilizando como precursores tiourea y acetato de zinc dihidratado o dicloruro de zinc. Las propiedades ópticas, estructurales,
morfológicas y de composición se han determinado para los distintos precursores de Zinc. Mediante XPS y desbastado por Ar + se ha
analizado la variación en profundidad de la composición de las bicapas obteniéndose que en ningún caso hay contaminación de carbón
u otras especies químicas que modifiquen el índice de refracción de la bicapa, aunque las intercaras obtenidas con dicloruro de zinc
dihidratado son más abruptas.
112 Silicon nitride and titanium nitride coatings on 316 stainless steel by atmospheric pressure CVD in a
fluidized bed reactor (FBR-CVD)
J.Perez-Mariano, S.Borros and C.Colominas
Grup d’Enginyeria Molecular, Institut Químic de Sarrià (GEM-IQS)
Via Augusta 390, 08017 Barcelona,Catalonia ( Spain)
Silicon nitride and titanium nitride coatings have been deposited on 316 stainless steel by Atmospheric Pressure Chemical Vapor
Deposition (AP-CVD) in a Fluidized Bed Reactor (FBR) from a reactive gas mixture of ammonia, hidrogen and SiCl4 or TiCl4,
respectively. Argon was used in both cases to fluidize a bed of alumina particles contained in the reaction chamber. Scanning electronic
microscopy, glow discharge optical emission spectroscopy, X-ray diffraction, infrarred spectroscopy and X-ray photoelectronic
spectroscopy are used to investigate the morphology, chemical composition and structural properties of the films. The results indicate
that silicon nitride coatings were amorphous, non-stoichiometric and electrically insulating. In the case of titanium nitride, smooth and
gold-colored coatings were obtained. In both cases, the deposition rate was in the range of 1 m to 1.5 m per hour and it was observed
the formation of a chromium nitride interlayer several microns thick under the coating. Present results show that AP-CVD in fluidized bed
reactors is a promising cost-effective technique for the deposition of homogeneous sub-micron layered ceramic structures.
122 Surface modification of polymers for tissue engineering aplications
L. Francesch 1 , E. Garreta 1 , A. Paz 1 , M. Balcells 2 , R. Förch 3 , S. Borrós 1 *
1 Laboratori de Ciència dels Materials-GEM IQS, Institut Químic de Sarrià (IQS)
2 Harvard University-Massachusetts Institute of Technology, Biomedical Engineering Department, Cambridge, USA
3 Max Planck Institut für Polymer Forschung, Mainz, Germany
A new monomer has been synthesized, a pentafluorophenyl acrylate, that has been polymerised by Plasma Enhanced Chemical Vapor
Deposition by soft ionization techniques. The polymer leaves labile groups on the surface, which facilitate a fast reaction with biotin and
streptavindin to attach biotinylated molecules in an easy way. Other monomers, such as acrylic acid and allylic alcohol, have also been
polymerised by plasma, leading to a surface with functional character that would result into a versatile platform for further linkage of
biotinylated biomolecules to promote cell attachment.
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