• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2014.tde-16012015-105512
Document
Author
Full name
Aline dos Santos Lira Durães
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Fantini, Marcia Carvalho de Abreu (President)
Brito, Giancarlo Esposito de Souza
Martins, Tereza da Silva
Title in Portuguese
Sílica mesoporosa ordenada luminescente
Keywords in Portuguese
Espalhamento de raios X a baixos ângulos
Física da Matéria Condensada
Isotermas de Adsorção de Nitrogênio
Luminescência
Abstract in Portuguese
O objetivo desse projeto foi o de produzir sílica mesoporosa ordenada (SMO) do tipo SBA-15 com fósforos. A incorporação dos fósforos às paredes da sílica foi realizada através de um único processo de síntese. Os métodos experimentais utilizados para caracterização das amostras foram: RBS (Rutherford Backscattering Spectrometry) para a análise química, SAXS (Small Angle X Ray Scattering), XRD (X Ray Diffraction) e NAI (Nitrogen Adsorption Isotherms) para a análise estrutural destes materiais, além da fotoluminescência. Para a caraterização morfológica complementar das amostras, foi utilizado o SEM (Scanning Electron Microscopy). A incorporação de Eu na matriz de sílica preserva a estrutura de poros ordenada. Os resultados de XRD mostraram a formação de óxidos de európio. A partir dos resultados obtidos observaram-se diferentes efeitos da presença e ausência de sobrenadante durante o período de secagem nas amostras preparadas, como por exemplo, alterações de morfologia. As amostras preparadas com sobrenadante apresentaram menor área superficial e volume de poros. Materiais que mantiveram o sobrenadante apresentaram maior conteúdo de Eu e maior intensidade de luminescência.
Title in English
Luminescent Ordered Mesoporous Silica
Keywords in English
Beams
Condensed Matter Physics
Luminescence
Nitrogen Adsorption Isotherms
Small Angle X Ray Scattering
Abstract in English
The aim of this project was to synthesize ordered mesoporous silica (OMS) with phosphorus. The incorporation of phosphorus to the silica walls was performed by means of a one pot synthesis process. The experimental methods used to characterize the samples were: RBS (Rutherford Backscattering Spectrometry) for chemical analysis, SAXS (Small Angle X Ray Scattering), XRD (X Ray Diffraction) and NAI (Nitrogen Adsorption Isotherms) for structural analysis, besides fluorescence. SEM (Scanning Electron Microscopy) was used for complementary morphological characterization of the samples. The Eu incorporation in the silica matrix preserves the ordered mesoporous structure. The XRD results showed the presence of europium oxides. The presence and absence of the liquid solution during the drying process caused the formation of samples with different properties, as, for example, modification in morphology. Samples prepared in the presence of the liquid solutions showed smaller surface area and pore volume. Materials prepared with the liquid solution during the drying process presented larger Eu content and higher photoluminescence intensity.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
DuraesAline.pdf (3.66 Mbytes)
Publishing Date
2015-02-23
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • DURAES, A. S. L., et al. Luminescent hexagonal ordered mesoporous silica with Eu and Y. In Hybrid Materials 2011, Strasbourg, 2011. Hybrid Materials 2011., 2011. Abstract.
  • DURAES, A. S. L., et al. Sílica mesoroprosa luminescente com európio incorporado. In 5o Encontro Nacional sobre Terras Raras, João Pessoa, PB, 2012. Anais 5o Encontro Nacional sobre Terras Raras., 2012. Resumo.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.