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Previous issue date: 2010-12-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Inorganic pigment comprises a host lattice, which is part of the chromophore
component (usually a transition metal cation) and possible components modifiers,
which stabilize, add or restate the properties pigments. Among the materials with
spinel, ferrites, and the chromite stand out, because they have broad technological
importance in the area of materials, applicability, pigments, catalytic hydrogenation,
thin film, ceramic tiles, among others. The present work, pigments containing
CuFe2O4, CuCr2O4,e CuFeCrO4, were synthesized by a method that makes use of
gelatin as organic precursor using their application to ceramic pigments. The
pigments were characterized by X-ray diffraction (XRD), Infrared spectroscopy,
scanning electron microscopy (SEM) spectroscopy in the UV-visible and Colorimetry.
The results confirmed the feasibility of the synthetic route used, with respect to
powders synthesized, there is the formation of spinel phase from 500?C, with an
increase in crystallinity and the formation of other phases. The pigments were shown
to be crystalline and the desired phases were obtained. The copper chromite have
hues ranging from green to black according to the calcination temperature, while the
copper chromite doped with iron had brownish. The ferrites showed copper color and
darker brown to black, which may indicate an interesting factor because of the
importance of black pigment / Pigmento inorg?nico ? formado por uma rede hospedeira, na qual se integra o
componente crom?foro (normalmente um c?tion de metal de transi??o) e os
poss?veis componentes modificadores, que estabilizam, conferem ou reafirmam as
propriedades pigmentantes. Dentre os pigmentos, as estruturas tipo espin?lio se
destacam por possuir ampla import?ncia tecnol?gica na ?rea de materiais, com
aplica??o em pigmentos, cat?lise de hidrogena??o, filmes finos, revestimentos
cer?micos, dentre outros. No presente trabalho, pigmentos contendo CuFe2O4,
CuCr2O4,e CuFeCrO4 foram sintetizados por uma nova rota qu?mica usando
gelatina como precursor org?nico visando sua aplica??o para pigmentos cer?micos.
Os pigmentos foram caracterizados por difra??o de raios X (DRX), espectroscopia
na regi?o do Infravermelho, Microscopia eletr?nica de varredura (MEV)
espectroscopia na regi?o do UV-Vis?vel e Colorimetria. Os resultados confirmaram a
viabilidade da rota de s?ntese utilizada; Com rela??o aos p?s-sintetizados, observase
a forma??o da fase espin?lio a partir de 500oC, com um aumento da
cristalinidade, bem como a forma??o de outras fases. Os pigmentos se mostraram
cristalinos e as fases desejadas foram obtidas. As cromitas de cobre possuem
tonalidades que v?o do verde ao preto, de acordo com a temperatura de calcina??o,
enquanto que as cromitas de cobre dopadas com ferro obtiveram colora??o marrom.
As ferritas de cobre apresentaram cores bem mais escuras, do marrom ao preto, o
que ? uma caracter?stica interessante devido ? grande import?ncia dos pigmentos
pretos na ind?stria cer?mica
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12705 |
| Date | 10 December 2010 |
| Creators | Costa, Asenete Frutuoso da |
| Contributors | CPF:06117988320, http://lattes.cnpq.br/3318871716111536, Oliveira, Otom Anselmo de, CPF:03936872449, http://lattes.cnpq.br/7903084274135177, Silva, Zelma Rocha da, CPF:09155546315, http://lattes.cnpq.br/9530744851546230, Marinho, ?rika Pinto, CPF:02381892443, http://lattes.cnpq.br/1192938961586608, Pimentel, Patr?cia Mendon?a, CPF:77858239449, http://lattes.cnpq.br/9303372770390061, Melo, Dulce Maria de Ara?jo |
| 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 | English |
| 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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