Desenvolvimento de pigmentos nanométricos encapsulados.

Detalhes bibliográficos
Ano de defesa: 2004
Autor(a) principal: Lopes, Kirian Pimenta
Orientador(a): Leite, Edson Roberto lattes
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de São Carlos
Programa de Pós-Graduação: Programa de Pós-Graduação em Química - PPGQ
Departamento: Não Informado pela instituição
País: BR
Palavras-chave em Português:
Química
Pigmentos inorgânicos
Nanopartículas
Encapsulamento
Método de Pechini
Nanocompósitos
Área do conhecimento CNPq:
CIENCIAS EXATAS E DA TERRA::QUIMICA
Link de acesso: https://repositorio.ufscar.br/handle/ufscar/6545
Resumo: In the present study, perovskite-type NiTiO3 ceramic pigments were prepared by the polymeric precursor method, originally proposed by Pechini. The transluscent and viscous polymeric resin was characterized by thermogravimetric analysis. The product of the resin s pyrolysis, also known as "puff", was desagglomerated and calcined at different temperatures, under room atmosphere. The evolution of the crystalline phase with increasing heat treatment temperature was studied by X-ray diffraction (XRD). A comparative study of the characteristics of the ceramic pigments, which resulted from the calcination of the attrition-milled "puff", was made. The calcined powders presented high specific superficial area values, as determined by the BET method. The pigment colors were measured by the CIE - L*a*b* colorimetric system. It was observed, through the colorimetrics coordinates, that the pigments are yellow. The morphology of the prepared NiTiO3 powders was studied by scanning electron microscopy. A mean particle diameter of approximately 30nm was estimated through transmission electron microscopy (TEM) measurements. The isoelectric point of the particles dispersed in ethanol was determined. Afterwards, the attrition-milled, nanometric, single-phase pigments, calcined at 600ºC for 2 hours, were coated with an amorphous SiO2 layer. The encapsulation was done by a sol-gel process. Moreover, the encapsulation was confirmed through TEM characterization, X-ray dispersive energy analysis and a shift on the position of the isoelectric point of the dispersed particles
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spelling Lopes, Kirian PimentaLeite, Edson Robertohttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783657E4http://lattes.cnpq.br/71791076501421472016-06-02T20:36:42Z2004-06-082016-06-02T20:36:42Z2004-04-08LOPES, Kirian Pimenta. Development of encapsulated nanometric pigments. 2004. 94 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2004.https://repositorio.ufscar.br/handle/ufscar/6545In the present study, perovskite-type NiTiO3 ceramic pigments were prepared by the polymeric precursor method, originally proposed by Pechini. The transluscent and viscous polymeric resin was characterized by thermogravimetric analysis. The product of the resin s pyrolysis, also known as "puff", was desagglomerated and calcined at different temperatures, under room atmosphere. The evolution of the crystalline phase with increasing heat treatment temperature was studied by X-ray diffraction (XRD). A comparative study of the characteristics of the ceramic pigments, which resulted from the calcination of the attrition-milled "puff", was made. The calcined powders presented high specific superficial area values, as determined by the BET method. The pigment colors were measured by the CIE - L*a*b* colorimetric system. It was observed, through the colorimetrics coordinates, that the pigments are yellow. The morphology of the prepared NiTiO3 powders was studied by scanning electron microscopy. A mean particle diameter of approximately 30nm was estimated through transmission electron microscopy (TEM) measurements. The isoelectric point of the particles dispersed in ethanol was determined. Afterwards, the attrition-milled, nanometric, single-phase pigments, calcined at 600ºC for 2 hours, were coated with an amorphous SiO2 layer. The encapsulation was done by a sol-gel process. Moreover, the encapsulation was confirmed through TEM characterization, X-ray dispersive energy analysis and a shift on the position of the isoelectric point of the dispersed particlesNo presente trabalho, pigmentos cerâmicos do tipo perovskita NiTiO3 foram preparados utilizando-se o método dos precursores poliméricos derivado do método originalmente proposto por Pechini. A resina polimérica, translúcida e viscosa, foi caracterizada usando-se análise termogravimétrica. O produto da pirólise da resina, denominado de puff , foi desaglomerado e calcinado a diferentes temperaturas, sob atmosfera ambiente, permitindo-se o acompanhamento da evolução das fases cristalinas por DRX. Foi feito um estudo comparativo das características dos pigmentos cerâmicos obtidos das calcinações após a moagem mecânica de alta energia do puff desaglomerado. Os pós resultantes das calcinações apresentaram elevados valores de área superficial específica, determinada pelo método de BET. A cor dos pigmentos foi medida utilizando-se o sistema colorimétrico CIE-L*a*b*. Os valores das coordenadas colorimétricas mostraram pigmentos de coloração amarela. A morfologia dos pós de NiTiO3 foi verificada por microscopia eletrônica de varredura. Pela microscopia eletrônica de transmissão observou-se partículas nanométricas, com diâmetro médio igual a 30nm. Determinou-se o ponto isoelétrico das partículas dispersas em etanol. A seguir, os pigmentos nanométricos e monofásicos, calcinados a 600ºC/2h, após moagem em atritor, foram recobertos com uma camada amorfa de SiO2. A reação de encapsulamento foi efetuada pelo método sol-gel. Tal encapsulamento foi confirmado por MET, pela variação do ponto isoelétrico das partículas dispersas em etanol e também por análise de energia dispersiva de raios X (EDX)Universidade Federal de Sao Carlosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Química - PPGQUFSCarBRQuímicaPigmentos inorgânicosNanopartículasEncapsulamentoMétodo de PechiniNanocompósitosCIENCIAS EXATAS E DA TERRA::QUIMICADesenvolvimento de pigmentos nanométricos encapsulados.Development of encapsulated nanometric pigmentsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL2.pdfapplication/pdf4044960https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/6545/1/2.pdf085d7be3acaf0d2b8412cc70f1ae83f7MD51THUMBNAIL2.pdf.jpg2.pdf.jpgIM Thumbnailimage/jpeg9048https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/6545/2/2.pdf.jpg67cb47aaa12b9818b9f279f29c8db392MD52ufscar/65452019-09-11 02:59:16.065oai:repositorio.ufscar.br:ufscar/6545Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-05-25T12:51:25.260156Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false
dc.title.por.fl_str_mv Desenvolvimento de pigmentos nanométricos encapsulados.
dc.title.alternative.eng.fl_str_mv Development of encapsulated nanometric pigments
title Desenvolvimento de pigmentos nanométricos encapsulados.
spellingShingle Desenvolvimento de pigmentos nanométricos encapsulados.
Lopes, Kirian Pimenta
Química
Pigmentos inorgânicos
Nanopartículas
Encapsulamento
Método de Pechini
Nanocompósitos
CIENCIAS EXATAS E DA TERRA::QUIMICA
title_short Desenvolvimento de pigmentos nanométricos encapsulados.
title_full Desenvolvimento de pigmentos nanométricos encapsulados.
title_fullStr Desenvolvimento de pigmentos nanométricos encapsulados.
title_full_unstemmed Desenvolvimento de pigmentos nanométricos encapsulados.
title_sort Desenvolvimento de pigmentos nanométricos encapsulados.
author Lopes, Kirian Pimenta
author_facet Lopes, Kirian Pimenta
author_role author
dc.contributor.authorlattes.por.fl_str_mv http://lattes.cnpq.br/7179107650142147
dc.contributor.author.fl_str_mv Lopes, Kirian Pimenta
dc.contributor.advisor1.fl_str_mv Leite, Edson Roberto
dc.contributor.advisor1Lattes.fl_str_mv http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783657E4
contributor_str_mv Leite, Edson Roberto
dc.subject.por.fl_str_mv Química
Pigmentos inorgânicos
Nanopartículas
Encapsulamento
Método de Pechini
Nanocompósitos
topic Química
Pigmentos inorgânicos
Nanopartículas
Encapsulamento
Método de Pechini
Nanocompósitos
CIENCIAS EXATAS E DA TERRA::QUIMICA
dc.subject.cnpq.fl_str_mv CIENCIAS EXATAS E DA TERRA::QUIMICA
description In the present study, perovskite-type NiTiO3 ceramic pigments were prepared by the polymeric precursor method, originally proposed by Pechini. The transluscent and viscous polymeric resin was characterized by thermogravimetric analysis. The product of the resin s pyrolysis, also known as "puff", was desagglomerated and calcined at different temperatures, under room atmosphere. The evolution of the crystalline phase with increasing heat treatment temperature was studied by X-ray diffraction (XRD). A comparative study of the characteristics of the ceramic pigments, which resulted from the calcination of the attrition-milled "puff", was made. The calcined powders presented high specific superficial area values, as determined by the BET method. The pigment colors were measured by the CIE - L*a*b* colorimetric system. It was observed, through the colorimetrics coordinates, that the pigments are yellow. The morphology of the prepared NiTiO3 powders was studied by scanning electron microscopy. A mean particle diameter of approximately 30nm was estimated through transmission electron microscopy (TEM) measurements. The isoelectric point of the particles dispersed in ethanol was determined. Afterwards, the attrition-milled, nanometric, single-phase pigments, calcined at 600ºC for 2 hours, were coated with an amorphous SiO2 layer. The encapsulation was done by a sol-gel process. Moreover, the encapsulation was confirmed through TEM characterization, X-ray dispersive energy analysis and a shift on the position of the isoelectric point of the dispersed particles
publishDate 2004
dc.date.available.fl_str_mv 2004-06-08
2016-06-02T20:36:42Z
dc.date.issued.fl_str_mv 2004-04-08
dc.date.accessioned.fl_str_mv 2016-06-02T20:36:42Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.citation.fl_str_mv LOPES, Kirian Pimenta. Development of encapsulated nanometric pigments. 2004. 94 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2004.
dc.identifier.uri.fl_str_mv https://repositorio.ufscar.br/handle/ufscar/6545
identifier_str_mv LOPES, Kirian Pimenta. Development of encapsulated nanometric pigments. 2004. 94 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2004.
url https://repositorio.ufscar.br/handle/ufscar/6545
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv application/pdf
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dc.publisher.program.fl_str_mv Programa de Pós-Graduação em Química - PPGQ
dc.publisher.initials.fl_str_mv UFSCar
dc.publisher.country.fl_str_mv BR
publisher.none.fl_str_mv Universidade Federal de São Carlos
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