Síntese de pigmentos cerâmicos inorgânicos nanométricos e encapsulados com estrutura core-shell pela rota dos precursores poliméricos
The present work has as objective the development of ceramic pigments based in iron oxides and cobalt through the polymeric precursor method, as well as study their characteristics and properties using methods of physical, chemical, morphological and optical characterizations.In this work was use...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/12746 |
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| Resumo: | The present work has as objective the development of ceramic pigments based
in iron oxides and cobalt through the polymeric precursor method, as well as
study their characteristics and properties using methods of physical, chemical,
morphological and optical characterizations.In this work was used iron nitrate,
and cobalt citrate as precursor and nanometer silica as a matrix. The synthesis
was based on dissolving the citric acid as complexing agent, addition of metal
oxides, such as chromophores ions and polymerization with ethylene glycol.
The powder obtained has undergone pre-ignition, breakdown and thermal
treatments at different calcination temperatures (700 °C, 800 °C, 900 °C, 1000
°C and 1100 °C). Thermogravimetric analyzes were performed (BT) and
Differential Thermal Analysis (DTA), in order to evaluate the term
decomposition of samples, beyond characterization by techniques such as BET,
which classified as microporous materials samples calcined at 700 ° C, 800 º C
and 900 º C and non-porous when annealed at 1000 ° C and 1100 º C, X-ray
diffraction (XRD), which identified the formation of two crystalline phases, the
Cobalt Ferrite (CoFe2O4) and Cristobalite (SiO2), Scanning Electron
Microscopy (SEM) revealed the formation of agglomerates of particles slightly
rounded;and Analysis of Colorimetry, temperature of 700 °C, 800 °C and 900
°C showed a brown color and 1000 °C and 1100 °C violet |
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