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Previous issue date: 2012-04-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / 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 ? C
and 900 ? C and non-porous when annealed at 1000 ? C and 1100 ? 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 / O presente trabalho tem como objetivo o desenvolvimento de pigmentos
cer?micos a base de ?xidos de ferro e cobalto atrav?s do m?todo dos
precursores polim?ricos, bem como o estudo de suas caracter?sticas e
propriedades atrav?s de m?todos de caracteriza??es f?sicas, qu?micas,
morfol?gicas e ?pticas. Neste trabalho foi utilizado nitrato de ferro e citrato de
cobalto como precursores e s?lica nanom?trica como matriz. A s?ntese foi
baseada na dissolu??o do ?cido c?trico, como agente complexante; adi??o dos
?xidos met?licos, como ?ons crom?foros e polimeriza??o com etileno glicol. O
P? obtido passou por pr?-calcina??o, desagrega??o e tratamentos t?rmicos em
diferentes temperaturas de calcina??o (700 ?C, 800 ?C, 900 ?C, 1000 ?C e 1100
?C). Foram feitas An?lises de Termogravimetria (TG) e An?lise T?rmica
Diferencial (DTA), a fim de se avaliar a termodecomposi??o das amostras,
al?m de caracteriza??es por t?cnicas como BET, que classificou como
materiais microporosos as amostras calcinadas a 700 ?C, 800 ?C e 900 ?C e
n?o porosos quando calcinados a 1000 ?C e 1100 ?C; Difra??o de Raios-X
(DRX), que identificou a forma??o de duas fases cristalinas, a Ferrita de
Cobalto (CoFe2O4) e a Cristobalita (SiO2); Microscopia Eletr?nica de Varredura
(MEV), que revelou a forma??o de aglomerados de part?culas ligeiramente
arredondadas; e an?lise de colorimetria na regi?o do UV-Vis?vel, verificando a
varia??o e o potencial de cromaticidade do pigmento que a temperaturas de
700 ?C, 800 ?C e 900 ?C apresentou a cor marrom e a 1000 ?C e 1100 ?C a cor
violeta
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12746 |
| Date | 09 April 2012 |
| Creators | Mac?do, D?rcia S?mia Santos Moura de |
| Contributors | CPF:06296687877, http://lattes.cnpq.br/2365059843175411, Moraes, M?rcio Luiz Varela Nogueira de, CPF:01157194745, http://lattes.cnpq.br/2573306822477569, Nascimento, Rubens Maribondo do, CPF:80732810400, http://lattes.cnpq.br/8671649752936793, Paskocimas, Carlos Alberto |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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