Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom
Ano de defesa: | 2019 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas |
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Química
|
Departamento: |
Química
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/18689 |
Resumo: | In this work, the heating profile of water, dimethyl sulfoxide (DMSO), acetonitrile (CH3CN) and ethanol (EtOH) and their solutions doped with imidazolium based ionic liquids (ILs) mono- (CnMIMBr, n = 4,6,8,10,12,14, and 16) and dicationic (Di-CnMIMBr n = 4,6,8 and 10), analogue ILs with BF4 anion (CnMIMBr, n = 4,8 and 14) and sodium bromide (NaBr) and sodium acetate (CH3CO2Na) were evaluated under ultrasound irradiation. Results showed that water and DMSO have a linear heating profile while CH3CN and EtOH follow a logarithmic profile. In general, the doped ILs solution warmed up a little faster than pure solvents, showing that the cationic moiety of ILs did not caused notable changes in the solvents heating profile. The concentration of ILs and the consequent dissociation effects of that were not observed either the experimental conditions tested. Addition of NaBr and CH3CO2Na changed the heating profile of ethanol, resulting in a linear profile. In addition, our results confirmed that experimental parameters such as amplitude of irradiation and volume of solution change significantly the heating profile of solvents. Finally, the heating profile of solvent and ILs doped solvent under conventional heating and stirring (silent experiments) showed that under ultrasound frequency, the cavitation process makes the heating faster and efficient. The dissipated power determination reflected more the heating profile than the heat capacity of solvent indicating that the heating rate in US reveals the cavitation effects in that medium. Results are important because they showed that the catalytic effects of ILs in chemical reactions or solvent effects in micro extraction processes under US irradiation can be retained without raising the temperature and without decomposition of ILs or products. |
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2019-10-29T16:09:38Z2019-10-29T16:09:38Z2019-03-29http://repositorio.ufsm.br/handle/1/18689In this work, the heating profile of water, dimethyl sulfoxide (DMSO), acetonitrile (CH3CN) and ethanol (EtOH) and their solutions doped with imidazolium based ionic liquids (ILs) mono- (CnMIMBr, n = 4,6,8,10,12,14, and 16) and dicationic (Di-CnMIMBr n = 4,6,8 and 10), analogue ILs with BF4 anion (CnMIMBr, n = 4,8 and 14) and sodium bromide (NaBr) and sodium acetate (CH3CO2Na) were evaluated under ultrasound irradiation. Results showed that water and DMSO have a linear heating profile while CH3CN and EtOH follow a logarithmic profile. In general, the doped ILs solution warmed up a little faster than pure solvents, showing that the cationic moiety of ILs did not caused notable changes in the solvents heating profile. The concentration of ILs and the consequent dissociation effects of that were not observed either the experimental conditions tested. Addition of NaBr and CH3CO2Na changed the heating profile of ethanol, resulting in a linear profile. In addition, our results confirmed that experimental parameters such as amplitude of irradiation and volume of solution change significantly the heating profile of solvents. Finally, the heating profile of solvent and ILs doped solvent under conventional heating and stirring (silent experiments) showed that under ultrasound frequency, the cavitation process makes the heating faster and efficient. The dissipated power determination reflected more the heating profile than the heat capacity of solvent indicating that the heating rate in US reveals the cavitation effects in that medium. Results are important because they showed that the catalytic effects of ILs in chemical reactions or solvent effects in micro extraction processes under US irradiation can be retained without raising the temperature and without decomposition of ILs or products.Neste trabalho, o perfil de aquecimento de água, dimetilsulfóxido (DMSO), acetonitrila (CH3CN) e etanol (EtOH) e de suas soluções dopadas com líquidos iônicos (LIs) mono- (CnMIMBr, n = 4, 6, 8, 10, 12, 14 e 16) e dicatiônicos (Di-CnMIMBr n = 4, 6, 8 e 10) derivados do imidazol, de LIs analogos com ânions BF4 (CnMIMBr, n = 4,8 e 14) e os sais brometo de sódio (NaBr) e acetato de sódio (CH3CO2Na) sob irradiação ultrassônica. Os resultados mostraram que a água e o DMSO têm um perfil de aquecimento linear em função do tempo, enquanto a CH3CN e o EtOH seguem um perfil logarítmico. Em geral, as soluções dopadas com LIs aqueceram levemente mais rápido do que os solventes puros, mostrando que a porção catiônica de LIs não causou mudanças notáveis no perfil de aquecimento dos solventes. Os efeitos da concentração e da dissociação dos LIs não foram observados em nenhuma das condições experimentais testadas. As soluções com NaBr e CH3CO2Na em EtOH apresentaram um perfil de aquecimento linear. Além disso, resultados confirmaram que parâmetros experimentais como amplitude de irradiação e volume de solução alteram significativamente o perfil de aquecimento dos solventes. Finalmente, o perfil de aquecimento dos solventes e dos solventes dopados com LIs sob aquecimento convencional e agitação (experimentos em condição de silêncio) mostraram que sob a freqüência de ultrassom, o processo de cavitação torna o aquecimento mais rápido e eficiente. A determinação da potência dissipada refletiu mais o perfil de aquecimento do que a capacidade calorífica do solvente, indicando que a taxa de aquecimento no US revela os efeitos de cavitação nesse meio. Os resultados são importantes porque mostraram que os efeitos catalíticos dos LIs em reações químicas ou efeitos dos solventes em processos de microextração sob irradiação de US podem ser preservados sem elevar a temperatura e sem a decomposição dos LIs ou produtos.porUniversidade Federal de Santa MariaCentro de Ciências Naturais e ExatasPrograma de Pós-Graduação em QuímicaUFSMBrasilQuímicaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessUltrassomSonoquímicaLíquidos iônicosPerfil de aquecimento de solventesPoder de dissipação do ultrassomUltrasoundSonochemistryIonic liquidSolvents heating profileDissipated ultrasonic powerCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICAEfeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassomEffect of the structure of ionic liquids derived from imidazol in the warm-up of molecular solvents under ultrasound irradiationinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisFrizzo, Clarissa Piccininhttp://lattes.cnpq.br/0029279904716491Zanatta, NiloMello, Paola de Azevedohttp://lattes.cnpq.br/2189500441942469Lourega, Rogerio Vesciahttp://lattes.cnpq.br/3322409815207121http://lattes.cnpq.br/3850098783982857Krüger, Nícolas1006000000006008339c8fa-17c5-4531-bcb5-111d15cb015cbce38a22-3090-4304-a757-b8a33e7ebdc9798773ff-ec37-46f0-b925-27d7c30a6c20b65e4edd-8764-4de1-a6fa-5ec448ea52eda30ec6bf-5e81-490b-87ea-eb85a0c63eb6reponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALDIS_PPGQUIMICA_2019_KRUGER_NICOLAS.pdfDIS_PPGQUIMICA_2019_KRUGER_NICOLAS.pdfDissertação de Mestradoapplication/pdf2070897http://repositorio.ufsm.br/bitstream/1/18689/1/DIS_PPGQUIMICA_2019_KRUGER_NICOLAS.pdf29c9d966532fc6525be530a60e17b89cMD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom |
dc.title.alternative.eng.fl_str_mv |
Effect of the structure of ionic liquids derived from imidazol in the warm-up of molecular solvents under ultrasound irradiation |
title |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom |
spellingShingle |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom Krüger, Nícolas Ultrassom Sonoquímica Líquidos iônicos Perfil de aquecimento de solventes Poder de dissipação do ultrassom Ultrasound Sonochemistry Ionic liquid Solvents heating profile Dissipated ultrasonic power CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom |
title_full |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom |
title_fullStr |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom |
title_full_unstemmed |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom |
title_sort |
Efeito da estrutura de líquidos iônicos derivados do imidazol no aquecimento de solventes moleculares sob irradiação com ultrassom |
author |
Krüger, Nícolas |
author_facet |
Krüger, Nícolas |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Frizzo, Clarissa Piccinin |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0029279904716491 |
dc.contributor.advisor-co1.fl_str_mv |
Zanatta, Nilo |
dc.contributor.referee1.fl_str_mv |
Mello, Paola de Azevedo |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/2189500441942469 |
dc.contributor.referee2.fl_str_mv |
Lourega, Rogerio Vescia |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/3322409815207121 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3850098783982857 |
dc.contributor.author.fl_str_mv |
Krüger, Nícolas |
contributor_str_mv |
Frizzo, Clarissa Piccinin Zanatta, Nilo Mello, Paola de Azevedo Lourega, Rogerio Vescia |
dc.subject.por.fl_str_mv |
Ultrassom Sonoquímica Líquidos iônicos Perfil de aquecimento de solventes Poder de dissipação do ultrassom |
topic |
Ultrassom Sonoquímica Líquidos iônicos Perfil de aquecimento de solventes Poder de dissipação do ultrassom Ultrasound Sonochemistry Ionic liquid Solvents heating profile Dissipated ultrasonic power CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Ultrasound Sonochemistry Ionic liquid Solvents heating profile Dissipated ultrasonic power |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
In this work, the heating profile of water, dimethyl sulfoxide (DMSO), acetonitrile (CH3CN) and ethanol (EtOH) and their solutions doped with imidazolium based ionic liquids (ILs) mono- (CnMIMBr, n = 4,6,8,10,12,14, and 16) and dicationic (Di-CnMIMBr n = 4,6,8 and 10), analogue ILs with BF4 anion (CnMIMBr, n = 4,8 and 14) and sodium bromide (NaBr) and sodium acetate (CH3CO2Na) were evaluated under ultrasound irradiation. Results showed that water and DMSO have a linear heating profile while CH3CN and EtOH follow a logarithmic profile. In general, the doped ILs solution warmed up a little faster than pure solvents, showing that the cationic moiety of ILs did not caused notable changes in the solvents heating profile. The concentration of ILs and the consequent dissociation effects of that were not observed either the experimental conditions tested. Addition of NaBr and CH3CO2Na changed the heating profile of ethanol, resulting in a linear profile. In addition, our results confirmed that experimental parameters such as amplitude of irradiation and volume of solution change significantly the heating profile of solvents. Finally, the heating profile of solvent and ILs doped solvent under conventional heating and stirring (silent experiments) showed that under ultrasound frequency, the cavitation process makes the heating faster and efficient. The dissipated power determination reflected more the heating profile than the heat capacity of solvent indicating that the heating rate in US reveals the cavitation effects in that medium. Results are important because they showed that the catalytic effects of ILs in chemical reactions or solvent effects in micro extraction processes under US irradiation can be retained without raising the temperature and without decomposition of ILs or products. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-10-29T16:09:38Z |
dc.date.available.fl_str_mv |
2019-10-29T16:09:38Z |
dc.date.issued.fl_str_mv |
2019-03-29 |
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.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/18689 |
url |
http://repositorio.ufsm.br/handle/1/18689 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.cnpq.fl_str_mv |
100600000000 |
dc.relation.confidence.fl_str_mv |
600 |
dc.relation.authority.fl_str_mv |
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dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Química |
dc.publisher.initials.fl_str_mv |
UFSM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Química |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.source.none.fl_str_mv |
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UFSM |
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