Síntese controlada de óxido de grafeno obtida em reator de bancada
Ano de defesa: | 2020 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Presbiteriana Mackenzie
|
Programa de Pós-Graduação: |
Engenharia de Materiais e Nanotecnologia
|
Departamento: |
Escola de Engenharia Mackenzie (EE)
|
País: |
Brasil
|
Palavras-chave em Português: | |
Área do conhecimento CNPq: | |
Link de acesso: | https://dspace.mackenzie.br/handle/10899/28456 |
Resumo: | Graphene oxide (GO) synthesis on a large scale is a reality, but aspects such as reduction of residues produced, reduction of reagents used, reproducibility with quality control are still factors that need to be explored. Thus, reducing the amounts of oxidizing reagents used while maintaining the same experimental synthesis conditions can be a good strategy to improve production processes in large quantities. Based on this line of thinking, the present work proposes a detailed study of use of different graphite /oxidizing reagents (mG/mROxi) proportions in the GO production, aiming to study their limiting conditions that provides good yield, structural quality and economy. Using the improved Hummers method, three samples containing different masses of graphite (called GO 3.0 g, GO 4.5 g and GO 6.0 g) were produced using a bench reactor to ensure the reproducibility of this process. From a structural and composition point of view, all prepared samples had the same characteristics, such as: degree of oxidation, interplanar distances and ID/IG ratio. However, from the exfoliation process of these samples in liquid phase, morphological and structural differences were verified. Through the AFM analyzes it was possible to observe the majority production of graphene oxide nanoforms containing between 1-5 layers with good structural quality, and lateral size up to 1.5µm for the GO 3.0 g and GO 4.5 g samples. However, in the GO 6.0 g sample, rounded micrometric graphitical sheets were observed, containing specific regions similar to “graphene islands”, however the analyzes obtained by this technique were not conclusive for this sample. Therefore, increasing the amount of graphite from 3.0 g to 4.5 g while maintaining the amount of oxidizing reagents produced materials with physicochemical characteristics similar to those of a commercial sample. Thus, a study detailing of mG/mROxi proportions in a controlled manner can be an efficient strategy for the production of GO with structural quality and scale up. |
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2021-12-15T19:36:30Z2021-12-15T19:36:30Z2020-12-18ANDRADE , Carolina Santos de. Síntese controlada de óxido de grafeno obtida em reator de bancada. 2020. 54 f.Dissertação( Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo.https://dspace.mackenzie.br/handle/10899/28456Graphene oxide (GO) synthesis on a large scale is a reality, but aspects such as reduction of residues produced, reduction of reagents used, reproducibility with quality control are still factors that need to be explored. Thus, reducing the amounts of oxidizing reagents used while maintaining the same experimental synthesis conditions can be a good strategy to improve production processes in large quantities. Based on this line of thinking, the present work proposes a detailed study of use of different graphite /oxidizing reagents (mG/mROxi) proportions in the GO production, aiming to study their limiting conditions that provides good yield, structural quality and economy. Using the improved Hummers method, three samples containing different masses of graphite (called GO 3.0 g, GO 4.5 g and GO 6.0 g) were produced using a bench reactor to ensure the reproducibility of this process. From a structural and composition point of view, all prepared samples had the same characteristics, such as: degree of oxidation, interplanar distances and ID/IG ratio. However, from the exfoliation process of these samples in liquid phase, morphological and structural differences were verified. Through the AFM analyzes it was possible to observe the majority production of graphene oxide nanoforms containing between 1-5 layers with good structural quality, and lateral size up to 1.5µm for the GO 3.0 g and GO 4.5 g samples. However, in the GO 6.0 g sample, rounded micrometric graphitical sheets were observed, containing specific regions similar to “graphene islands”, however the analyzes obtained by this technique were not conclusive for this sample. Therefore, increasing the amount of graphite from 3.0 g to 4.5 g while maintaining the amount of oxidizing reagents produced materials with physicochemical characteristics similar to those of a commercial sample. Thus, a study detailing of mG/mROxi proportions in a controlled manner can be an efficient strategy for the production of GO with structural quality and scale up.A síntese de óxido de grafeno (GO) em larga escala já é uma realidade, porém aspectos como redução de resíduos produzidos, redução de reagentes utilizados, reprodutibilidade com controle de qualidade ainda são fatores que precisam ser explorados. Dessa maneira, reduzir as quantidades de reagentes oxidantes usados mantendo iguais as condições experimentais de síntese, pode ser uma boa estratégia para melhorar processos de produção em grandes quantidades. Com base nessa linha de pensamento, o presente trabalho propõe um estudo detalhado do uso de diferentes proporções da relação grafite/reagentes oxidantes (mG/mROxi) na síntese do GO, objetivando produzir uma condição limite desta proporção que propicie bom rendimento, qualidade estrutural e economia. Utilizando-se o método de Hummers melhorado, três amostras contendo diferentes massas de grafite (denominadas GO 3,0 g, GO 4,5 g e GO 6,0 g) foram produzidas utilizando um reator de bancada para garantir a reprodutibilidade do processo. Do ponto de vista estrutural e de composição, todas as amostras preparadas apresentaram as mesmas características, tais como: grau de oxidação, distâncias interplanares e razão ID/IG. No entanto, a partir do processo de esfoliação destas amostras em fase líquida, diferenças morfológicas e estruturais foram verificadas. Através das análises de AFM foi possível observar a produção majoritária de nanofolhas de óxido de grafeno contendo entre 1-5 camadas com boa qualidade estrutural e tamanho lateral até 1,5 µm para as amostras GO 3,0 g e GO 4,5 g. No entanto, na amostra GO 6.0 g observou-se folhas grafíticas micrométricas arredondadas, contendo regiões específicas parecidas a “ilhas de grafeno”, porém as análises obtidas por essa técnica não foram conclusivas para esta amostra. Assim sendo, o aumento da quantidade de grafite de 3,0 g para 4,5 g mantendo a quantidade de reagentes oxidantes produziu um material com características físico-químicas similares a de uma amostra comercial. Dessa maneira, um estudo detalhando da proporção mG/mROxi de forma controlada pode ser uma eficiente estratégia para produção de GO com qualidade estrutural e aumento de escala.Universidade Presbiteriana Mackenzieapplication/pdfporUniversidade Presbiteriana MackenzieEngenharia de Materiais e NanotecnologiaUPMBrasilEscola de Engenharia Mackenzie (EE)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessóxido de grafenoprodução escalonadasíntese controladamétodo de Hummers melhoradoCNPQ::ENGENHARIASSíntese controlada de óxido de grafeno obtida em reator de bancadainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisRibeiro, Héliohttp://lattes.cnpq.br/0766240077339002Andrade , Ricardo Jorge Espanholhttp://lattes.cnpq.br/2704277390841473Fechine, Guilhermino José Macêdohttp://lattes.cnpq.br/8109533360196619Silva, Wellington Marcos dahttp://lattes.cnpq.br/2635568268883901Andrade, Carolina Santos degraphene oxidestaggered productioncontrolled synthesisimproved Hummer`s method.reponame:Biblioteca Digital de Teses e Dissertações do Mackenzieinstname:Universidade Presbiteriana Mackenzie (MACKENZIE)instacron:MACKENZIEORIGINALCarolina Santos de Andrade.pdfCarolina Santos de Andradeapplication/pdf2993562https://dspace.mackenzie.br/bitstream/10899/28456/1/Carolina%20Santos%20de%20Andrade.pdf6421c105151fdf542df480957bc30641MD51CC-LICENSElicense_urlapplication/octet-stream49https://dspace.mackenzie.br/bitstream/10899/28456/2/license_url4afdbb8c545fd630ea7db775da747b2fMD52license_textapplication/octet-stream0https://dspace.mackenzie.br/bitstream/10899/28456/3/license_textd41d8cd98f00b204e9800998ecf8427eMD53license_rdfapplication/octet-stream0https://dspace.mackenzie.br/bitstream/10899/28456/4/license_rdfd41d8cd98f00b204e9800998ecf8427eMD54LICENSElicense.txttext/plain2108https://dspace.mackenzie.br/bitstream/10899/28456/5/license.txt1ca4f25d161e955cf4b7a4aa65b8e96eMD55TEXTCarolina Santos de Andrade.pdf.txtCarolina Santos de 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Digital de Teses e Dissertaçõeshttp://tede.mackenzie.br/jspui/PRI |
dc.title.por.fl_str_mv |
Síntese controlada de óxido de grafeno obtida em reator de bancada |
title |
Síntese controlada de óxido de grafeno obtida em reator de bancada |
spellingShingle |
Síntese controlada de óxido de grafeno obtida em reator de bancada Andrade, Carolina Santos de óxido de grafeno produção escalonada síntese controlada método de Hummers melhorado CNPQ::ENGENHARIAS |
title_short |
Síntese controlada de óxido de grafeno obtida em reator de bancada |
title_full |
Síntese controlada de óxido de grafeno obtida em reator de bancada |
title_fullStr |
Síntese controlada de óxido de grafeno obtida em reator de bancada |
title_full_unstemmed |
Síntese controlada de óxido de grafeno obtida em reator de bancada |
title_sort |
Síntese controlada de óxido de grafeno obtida em reator de bancada |
author |
Andrade, Carolina Santos de |
author_facet |
Andrade, Carolina Santos de |
author_role |
author |
dc.contributor.advisor-co1.fl_str_mv |
Ribeiro, Hélio |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/0766240077339002 |
dc.contributor.advisor1.fl_str_mv |
Andrade , Ricardo Jorge Espanhol |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/2704277390841473 |
dc.contributor.referee1.fl_str_mv |
Fechine, Guilhermino José Macêdo |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/8109533360196619 |
dc.contributor.referee2.fl_str_mv |
Silva, Wellington Marcos da |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/2635568268883901 |
dc.contributor.author.fl_str_mv |
Andrade, Carolina Santos de |
contributor_str_mv |
Ribeiro, Hélio Andrade , Ricardo Jorge Espanhol Fechine, Guilhermino José Macêdo Silva, Wellington Marcos da |
dc.subject.por.fl_str_mv |
óxido de grafeno produção escalonada síntese controlada método de Hummers melhorado |
topic |
óxido de grafeno produção escalonada síntese controlada método de Hummers melhorado CNPQ::ENGENHARIAS |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS |
description |
Graphene oxide (GO) synthesis on a large scale is a reality, but aspects such as reduction of residues produced, reduction of reagents used, reproducibility with quality control are still factors that need to be explored. Thus, reducing the amounts of oxidizing reagents used while maintaining the same experimental synthesis conditions can be a good strategy to improve production processes in large quantities. Based on this line of thinking, the present work proposes a detailed study of use of different graphite /oxidizing reagents (mG/mROxi) proportions in the GO production, aiming to study their limiting conditions that provides good yield, structural quality and economy. Using the improved Hummers method, three samples containing different masses of graphite (called GO 3.0 g, GO 4.5 g and GO 6.0 g) were produced using a bench reactor to ensure the reproducibility of this process. From a structural and composition point of view, all prepared samples had the same characteristics, such as: degree of oxidation, interplanar distances and ID/IG ratio. However, from the exfoliation process of these samples in liquid phase, morphological and structural differences were verified. Through the AFM analyzes it was possible to observe the majority production of graphene oxide nanoforms containing between 1-5 layers with good structural quality, and lateral size up to 1.5µm for the GO 3.0 g and GO 4.5 g samples. However, in the GO 6.0 g sample, rounded micrometric graphitical sheets were observed, containing specific regions similar to “graphene islands”, however the analyzes obtained by this technique were not conclusive for this sample. Therefore, increasing the amount of graphite from 3.0 g to 4.5 g while maintaining the amount of oxidizing reagents produced materials with physicochemical characteristics similar to those of a commercial sample. Thus, a study detailing of mG/mROxi proportions in a controlled manner can be an efficient strategy for the production of GO with structural quality and scale up. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020-12-18 |
dc.date.accessioned.fl_str_mv |
2021-12-15T19:36:30Z |
dc.date.available.fl_str_mv |
2021-12-15T19:36:30Z |
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 |
ANDRADE , Carolina Santos de. Síntese controlada de óxido de grafeno obtida em reator de bancada. 2020. 54 f.Dissertação( Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo. |
dc.identifier.uri.fl_str_mv |
https://dspace.mackenzie.br/handle/10899/28456 |
identifier_str_mv |
ANDRADE , Carolina Santos de. Síntese controlada de óxido de grafeno obtida em reator de bancada. 2020. 54 f.Dissertação( Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo. |
url |
https://dspace.mackenzie.br/handle/10899/28456 |
dc.language.iso.fl_str_mv |
por |
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por |
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http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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Universidade Presbiteriana Mackenzie |
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Engenharia de Materiais e Nanotecnologia |
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UPM |
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Brasil |
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Universidade Presbiteriana Mackenzie |
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