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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
22/03/2022 |
Data da última atualização: |
23/01/2024 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SILVA, P. F. da; GOMES, B. F.; LOBO, C. M. S.; CARMO, M.; ROTH, C.; COLNAGO, L. A. |
Afiliação: |
LUIZ ALBERTO COLNAGO, CNPDIA. |
Título: |
Composite graphite epoxy electrodes for in situ electrochemistry coupling with high resolution NMR. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
ACS Omega 2022, v. 7, 2022. |
Páginas: |
4991-5000 |
DOI: |
https://doi.org/10.1021/acsomega.1c05823 |
Idioma: |
Inglês |
Conteúdo: |
The in situ coupling between electrochemistry and spectrometric techniques can help in the identification and quantification of the compounds produced and consumed during electrochemical reactions. The combination of electrochemistry with nuclear magnetic resonance is quite attractive in this respect, but it has some challenges to be addressed, namely, the reduction in the quality of the NMR signal when the metallic electrodes are placed close to or in the detection region. Since NMR is not a passive technique, the convective effect of the magnetic force (magnetoelectrolysis), which acts by mixing the solution and increasing the mass transport, has to be considered. In seeking to solve the aforementioned problems, we developed a system of miniaturized electrodes inside a 5 mm NMR tube (outer diameter); the working and counter electrodes were prepared with a mixture of graphite powder and epoxy resin. To investigate the performance of the electrodes, the benzoquinone reduction to hydroquinone and the isopropanol oxidation to acetone were monitored. To monitor the alcohol oxidation reaction, the composite graphite−epoxy electrode (CGEE) surface was modified through platinization. The electrode was efficient for in situ monitoring of the aforementioned reactions, when positioned 1 mm above the detection region of the NMR spectrometer. The magnetoelectrolysis effect acts by stirring the solution and increases the reaction rate of the reduction of benzoquinone, because this reaction is limited by mass transport, while no effect on the reaction rate is observed for the isopropanol oxidation reaction. MenosThe in situ coupling between electrochemistry and spectrometric techniques can help in the identification and quantification of the compounds produced and consumed during electrochemical reactions. The combination of electrochemistry with nuclear magnetic resonance is quite attractive in this respect, but it has some challenges to be addressed, namely, the reduction in the quality of the NMR signal when the metallic electrodes are placed close to or in the detection region. Since NMR is not a passive technique, the convective effect of the magnetic force (magnetoelectrolysis), which acts by mixing the solution and increasing the mass transport, has to be considered. In seeking to solve the aforementioned problems, we developed a system of miniaturized electrodes inside a 5 mm NMR tube (outer diameter); the working and counter electrodes were prepared with a mixture of graphite powder and epoxy resin. To investigate the performance of the electrodes, the benzoquinone reduction to hydroquinone and the isopropanol oxidation to acetone were monitored. To monitor the alcohol oxidation reaction, the composite graphite−epoxy electrode (CGEE) surface was modified through platinization. The electrode was efficient for in situ monitoring of the aforementioned reactions, when positioned 1 mm above the detection region of the NMR spectrometer. The magnetoelectrolysis effect acts by stirring the solution and increases the reaction rate of the reduction of benzoquinone, because this react... Mostrar Tudo |
Palavras-Chave: |
Electrochemical reactions; Magnetoelectrolysis; Nuclear magnetic resonance. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/232809/1/P-Composite-Graphite8722Epoxy-Electrodes-for-In-Situ-Electrochemistry.pdf
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Marc: |
LEADER 02349naa a2200241 a 4500 001 2141124 005 2024-01-23 008 2022 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1021/acsomega.1c05823$2DOI 100 1 $aSILVA, P. F. da 245 $aComposite graphite epoxy electrodes for in situ electrochemistry coupling with high resolution NMR.$h[electronic resource] 260 $c2022 300 $a4991-5000 520 $aThe in situ coupling between electrochemistry and spectrometric techniques can help in the identification and quantification of the compounds produced and consumed during electrochemical reactions. The combination of electrochemistry with nuclear magnetic resonance is quite attractive in this respect, but it has some challenges to be addressed, namely, the reduction in the quality of the NMR signal when the metallic electrodes are placed close to or in the detection region. Since NMR is not a passive technique, the convective effect of the magnetic force (magnetoelectrolysis), which acts by mixing the solution and increasing the mass transport, has to be considered. In seeking to solve the aforementioned problems, we developed a system of miniaturized electrodes inside a 5 mm NMR tube (outer diameter); the working and counter electrodes were prepared with a mixture of graphite powder and epoxy resin. To investigate the performance of the electrodes, the benzoquinone reduction to hydroquinone and the isopropanol oxidation to acetone were monitored. To monitor the alcohol oxidation reaction, the composite graphite−epoxy electrode (CGEE) surface was modified through platinization. The electrode was efficient for in situ monitoring of the aforementioned reactions, when positioned 1 mm above the detection region of the NMR spectrometer. The magnetoelectrolysis effect acts by stirring the solution and increases the reaction rate of the reduction of benzoquinone, because this reaction is limited by mass transport, while no effect on the reaction rate is observed for the isopropanol oxidation reaction. 653 $aElectrochemical reactions 653 $aMagnetoelectrolysis 653 $aNuclear magnetic resonance 700 1 $aGOMES, B. F. 700 1 $aLOBO, C. M. S. 700 1 $aCARMO, M. 700 1 $aROTH, C. 700 1 $aCOLNAGO, L. A. 773 $tACS Omega 2022$gv. 7, 2022.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Agroindústria de Alimentos. Para informações adicionais entre em contato com ctaa.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Agroindústria de Alimentos. |
Data corrente: |
12/02/2008 |
Data da última atualização: |
12/02/2008 |
Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
Circulação/Nível: |
-- - -- |
Autoria: |
FERNANDES, L. M.; SOUZA, L. G. V.; ASCHERI, J. L. R.; MARCONCINI, J. M.; ANDRADE, C. T.; CARVALHO, C. W. P. |
Afiliação: |
Leonardo M. Fernandes, Embrapa Agroindústria de Alimentos; Luiz G. V. Souza, Embrapa Agroindústria de Alimentos; José L. R. Ascheri, Embrapa Agroindústria de Alimentos; José M. Marconcini, Embrapa Instrumentação Agropecuária, Cristina T. Andrade, UFRJ; C. |
Título: |
Uso de grits de milho na elaboração de material extrusado para embalagem. |
Ano de publicação: |
2007 |
Fonte/Imprenta: |
In: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 3., 2007, Londrina. Anais... São Carlos, SP: Embrapa Instrumentação Agropecuária, 2007. p. 135-137. |
Idioma: |
Português |
Palavras-Chave: |
Biodegradável; Conversão de amido; Glicerol. |
Thesagro: |
Embalagem; Milho. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00759naa a2200229 a 4500 001 1413264 005 2008-02-12 008 2007 bl --- 0-- u #d 100 1 $aFERNANDES, L. M. 245 $aUso de grits de milho na elaboração de material extrusado para embalagem. 260 $c2007 650 $aEmbalagem 650 $aMilho 653 $aBiodegradável 653 $aConversão de amido 653 $aGlicerol 700 1 $aSOUZA, L. G. V. 700 1 $aASCHERI, J. L. R. 700 1 $aMARCONCINI, J. M. 700 1 $aANDRADE, C. T. 700 1 $aCARVALHO, C. W. P. 773 $tIn: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 3., 2007, Londrina. Anais... São Carlos, SP: Embrapa Instrumentação Agropecuária, 2007. p. 135-137.
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