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Doctoral Thesis
DOI
https://doi.org/10.11606/T.76.1999.tde-09092008-095955
Document
Author
Full name
Roberto Weider de Assis Franco
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1999
Supervisor
Committee
Gonzalez, Jose Pedro Donoso (President)
Gandra, Flavio Cesar Guimarães
Nascimento, Otaciro Rangel
Rabbani, Said Rahnamaye
Zanotto, Edgar Dutra
Title in Portuguese
Estudo de compósitos poliméricos e vidros fluoroindatos por ressonância magnética.
Keywords in Portuguese
Compósitos
RMN
RPE
Vidros.
Abstract in Portuguese
Foram estudados compósitos poluméricos e vidros fluoroindatos utilizando as espectroscopias de Ressonância Magnética Nuclear (RMN) pulsada e Ressonância Paramagnética Eletrônica (RPE). O estudo de RMN do 1H nos compósitos baseado no polímero polióxido de etileno e partículas de carbono permitiu diferenciar as mobilidades das cadeias poluméricas e identificar as contribuições destas fases. A partir das medidas de RPE foi possível sugerir uma interpretação das interações entre as partículas de carbono nos compósitos. Nos vidros fluoroindatos foi estudado o processo de cristalização, sendo acompanhada sua influência na relaxação nuclear do 19F. A cristalização foi observada por RPE nos vidros dopados com Cu2+, Mn2+ e Gd3+, sendo verificadas as alterações locais causadas por este processo.
Title in English
Magnetic resonance study of polymeric composites and fluoroindate glasses.
Keywords in English
Composites
EPR
Glasses
NMR.
Abstract in English
Polymeric composites and fluoroindate glasses were studied using pulsed Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies. Study of the composite formed by the polymer poly-ethylene oxide and carbon particles allowed us to distinguish the mobilities of polimeric chains and to identify the contributions from different phases. From EPR measurements it was possible to suggest an interpretation of the interactions between carbon particles in the composites. The main objective in the fluoroindate glasses study was to follow the crystallzation process. The 19F NMR measurements allowed to the observation of the influence of this process in the nuclear relaxation. The crystallization was also tracked by EPR spectroscopy in the doped glasses with the paramagnetic ions Cu2+, Mn2+ and Gd3+. This was accomplished by observing the local alterations caused by that process.
 
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RobertoFrancoD.pdf (4.02 Mbytes)
Publishing Date
2008-09-10
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • BLOISE JúNIOR, A.C., et al. Nuclear magnetic resonance study of PEO-based composite polymer electrolytes. Eletrochimica Acta, 2001, vol. 46, p. 1571-1579.
  • CARVALHO, J.F., et al. Optical and magnetic characterization of pure and vanadium doped Bi12TiO20 sillenite crystals. Optical Materials, 1999, vol. 13, n. 3, p. 333-338.
  • CARVALHO, J.F., et al. Vanadium characterization in BTO:V sillenite crystals. Materials Research, 1999, vol. 2, n. 2, p. 87-91.
  • FRANCO, R, et al. Magnetic resonance study of the crystallization behavior of InF3-based glasses doped with Cu2+, Mn2+ and Gd3+ [doi:10.1016/j.jnoncrysol.2006.02.107]. Journal of Non-Crystalline Solids [online], 2006, vol. 352, n. -3, p. 3414-3422.
  • FRANCO, R.W.A., et al. Differential scanning calorimetry, x-ray diffraction and 19F nuclear magnetic resonance investigations of the crystallization of InF3-based glasses. Journal of Chemical Physics, 1998, vol. 109, n. 6, p. 2432-2436.
  • FRANCO, R.W.A., et al. Electric and magnetic properties of polymer electrolyte/carbon black composites. Solid State Ionics, 1998, vol. 113, n. -3, p. 149-160.
  • FRANCO, R.W.A., et al. NMR and DSC polymer electrolyte-carbon black composites. Solid State Ionics, 2000, vol. 136, p. 1181-1187.
  • RODELLA, C.B., et al. Chemical and structural characterization of V2O5/TiO2 catalysts. Journal of Vaccum Science and Technology. Part A, 2001, vol. 19, n. 4, p. 1158-1163.
  • RODELLA, C.B., et al. Surface characterization of V2O5/TiO2 catalytic system. Physica Status Solidi. A, 2001, vol. 187, n. 1, p. 161-169.
  • RODELLA, C.B., et al. V2O5/TiO2 catalytic xerogels: method of preparation and characterization. Journal of Sol-Gel Science and Technology, 2002, vol. 25, n. 1, p. 75-82.
  • RODELLA, C.B., et al. V2O5/TiO2 catalytic xerogels: Raman and EPR studies. Journal of Sol-Gel Science and Technology, 2002, vol. 25, n. 1, p. 83-88.
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