Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x
Ano de defesa: | 2016 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal do Maranhão
|
Programa de Pós-Graduação: |
PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIA DOS MATERIAIS/CCSST
|
Departamento: |
COORDENAÇÃO DO CURSO DE CIENCIA E TECNOLOGIA - IMPERATRIZ/CCSST
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://tedebc.ufma.br:8080/jspui/handle/tede/1341 |
Resumo: | Materials consisting of amino acids are of great interest in the application in nonlinear optical (NLO) and are being studied more carefully because they have properties better than the potassium dihydrogen phosphate (KDP), the material most commonly used for Second Generation Harmonic (SHG). In this work, the crystals of L-arginine hydrobromidric monohydrate (LAHBr) and L-arginine hydrochloridric monohydrate (LAHCl) were grown at room temperature (25° C) by the method of slow evaporation of solvent. Were also synthesized hydrochlorobromidric L-arginine monohydrate crystals (LAHClBr) from the mixture of the compounds in equimolar proportions 1:3, 1:1 and 3:1. These five crystals were characterized by the techniques of X-Ray Fluorescence (XRF), Diffraction X-Ray (XRD), Raman Spectroscopy, Thermogravimetry (TG), Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC). The chemical composition of the single crystal was analyzed by X-ray Fluorescence (XRF) and compositions obtained were: C6H14N4O2•HCL0.14BR0.86•H2O (LAHCl0,14Br0,86), C6H14N4 O2•HCL0.42BR0.58•H2O (LAHCl0,42Br0,58), e C6H14N4O2•HCL0.63BR0.37•H2O (LAHCl0,63Br0,37). The structural parameters of the crystals were characterized by X-ray diffraction (XRD) in association with the Rietveld refinement. The all samples crystallize with the monoclinic structure (space group P21) and the unit cell volume of LAHClxBr1-x series decreases with increasing concentration of chlorine in the composition of the samples. The vibrational modes were observed by Raman Spectroscopy. The Raman spectrum experiments have shown that bands associated with lattice modes undergo blue shifts as the concentration of chorine ion is increased in addition to complement the results obtained by XRD technique. The thermal analysis of TG, DTA and DSC showed that the crystals analyzed show a decrease in temperature of the characteristic exothermic phase transition event, as well as increasing in the melting temperature of the material, with increasing chlorine concentration. The crystals LAHBr, LAHClBr and LAHCl to lose water of hydration suffer phase transformation goes to anhydrous phase without change in structure (monoclinic-monoclinic) and present structural phase transition around 150 oC. |
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SANTOS, Adenilson Oliveira dos016.759.989-57031.059.583-55http://lattes.cnpq.br/4194578916311023PEREIRA, Adriano Bezerra2017-05-05T19:27:14Z2016-07-29PEREIRA, Adriano Bezerra. Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x. 2016. 76 f. Dissertação (Programa de Pós-Graduação em Ciência dos Materiais) - Universidade Federal do Maranhão, Imperatriz, 2016.http://tedebc.ufma.br:8080/jspui/handle/tede/1341Materials consisting of amino acids are of great interest in the application in nonlinear optical (NLO) and are being studied more carefully because they have properties better than the potassium dihydrogen phosphate (KDP), the material most commonly used for Second Generation Harmonic (SHG). In this work, the crystals of L-arginine hydrobromidric monohydrate (LAHBr) and L-arginine hydrochloridric monohydrate (LAHCl) were grown at room temperature (25° C) by the method of slow evaporation of solvent. Were also synthesized hydrochlorobromidric L-arginine monohydrate crystals (LAHClBr) from the mixture of the compounds in equimolar proportions 1:3, 1:1 and 3:1. These five crystals were characterized by the techniques of X-Ray Fluorescence (XRF), Diffraction X-Ray (XRD), Raman Spectroscopy, Thermogravimetry (TG), Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC). The chemical composition of the single crystal was analyzed by X-ray Fluorescence (XRF) and compositions obtained were: C6H14N4O2•HCL0.14BR0.86•H2O (LAHCl0,14Br0,86), C6H14N4 O2•HCL0.42BR0.58•H2O (LAHCl0,42Br0,58), e C6H14N4O2•HCL0.63BR0.37•H2O (LAHCl0,63Br0,37). The structural parameters of the crystals were characterized by X-ray diffraction (XRD) in association with the Rietveld refinement. The all samples crystallize with the monoclinic structure (space group P21) and the unit cell volume of LAHClxBr1-x series decreases with increasing concentration of chlorine in the composition of the samples. The vibrational modes were observed by Raman Spectroscopy. The Raman spectrum experiments have shown that bands associated with lattice modes undergo blue shifts as the concentration of chorine ion is increased in addition to complement the results obtained by XRD technique. The thermal analysis of TG, DTA and DSC showed that the crystals analyzed show a decrease in temperature of the characteristic exothermic phase transition event, as well as increasing in the melting temperature of the material, with increasing chlorine concentration. The crystals LAHBr, LAHClBr and LAHCl to lose water of hydration suffer phase transformation goes to anhydrous phase without change in structure (monoclinic-monoclinic) and present structural phase transition around 150 oC.Materiais constituídos por aminoácidos são de grande interesse na aplicação em óptica nãolinear (NLO) e estão sendo estudados com maior atenção por apresentarem propriedades melhores do que o material mais utilizado para Geração de Segundo Harmônico (SHG); dihidrogenofosfato de potássio (KDP). Neste trabalho os monocristais de L-arginina hidrobromídrica monohidratada (LAHBr) e L-arginina hidroclorídrica monohidratada (LAHCl) foram crescidos à temperatura ambiente (25°C), pelo método de evaporação lenta do solvente. Também foram sintetizados cristais de L-arginina hidroclorobromídrica monohidratada (LAHClBr), a partir da mistura dos dois compostos, nas proporções molares 1:3, 1:1 e 3:1. Esses cinco cristais foram caracterizados pelas técnicas de Fluorescência de raios-X (FRX), Difração de raios-X (DRX), Espectroscopia Raman, Termogravimetria (TG), Análise Diferencial Térmica (DTA) e Calorimetria Exploratória Diferencial (DSC). A composição química dos monocristais foi analisada por FRX e as composições são: C6H14N4O2•HCL0.14BR0.86•H2O (LAHCl0,14Br0,86), C6H14N4O2•HCL0.42BR0.58•H2O (LAHCl0,42Br0,58), e H14N4O2•HCL0.63BR0.37•H2O (LAHCl0,63Br0,37), para as amostras de LAHClBr 1:3, LAHClBr 1:1 e LAHClBr 3:1, respectivamente. Os parâmetros estruturais dos cristais foram caracterizados por DRX em associação com o refinamento de Rietveld, onde observamos que todas as amostras se cristalizam com a estrutura monoclínica (grupo espacial P21) e que o volume da célula unitária da série LAHClxBr1-x diminue com o aumento da concentração de Cloro na composição das amostras. Os modos vibracionais foram observados por Espectroscopia Raman. Os espectros Raman mostraram que as bandas associadas aos modos de rede sofreram blue shifts com o aumento da concentração de Cl, além de complementar os resultados obtidos pela técnica de DRX. As análises térmicas de TG, DTA e DSC mostraram que os cristais analisados apresentaram uma diminuição de temperatura do evento exotérmico característico de transição de fase com o aumento da concentração de Cl, bem como, aumento da temperatura em que ocorre a fusão do material. Os cristais de LAHBr, LAHClBr e LAHCl ao perderem água de hidratação sofrem transformação de fase indo para a fase anidra sem mudança na estrutura cristalina monoclínicamonoclínica) e apresentam uma transição de fase estrutural em torno de 150 oC.Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-05-05T19:27:14Z No. of bitstreams: 1 AdrianoPereira.pdf: 4552452 bytes, checksum: c5dc1a24e3fc6e843a7a494ecc39cb39 (MD5)Made available in DSpace on 2017-05-05T19:27:14Z (GMT). No. of bitstreams: 1 AdrianoPereira.pdf: 4552452 bytes, checksum: c5dc1a24e3fc6e843a7a494ecc39cb39 (MD5) Previous issue date: 2016-07-29Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ)Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA)application/pdfporUniversidade Federal do MaranhãoPROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIA DOS MATERIAIS/CCSSTUFMABrasilCOORDENAÇÃO DO CURSO DE CIENCIA E TECNOLOGIA - IMPERATRIZ/CCSSTL-argininaDifração de raios-XEspectroscopia RamanTransição de faseEstabilidade térmicaL-arginineRaman SpectroscopyX-ray diffractionPhase transitionThermal StabilityFísica da Matéria CondensadaCaracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-xStructural and thermal characterization of crystals of L-Arginine • HClxHBr1-xinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFMAinstname:Universidade Federal do Maranhão (UFMA)instacron:UFMAORIGINALAdrianoPereira.pdfAdrianoPereira.pdfapplication/pdf4552452http://tedebc.ufma.br:8080/bitstream/tede/1341/2/AdrianoPereira.pdfc5dc1a24e3fc6e843a7a494ecc39cb39MD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82255http://tedebc.ufma.br:8080/bitstream/tede/1341/1/license.txt97eeade1fce43278e63fe063657f8083MD51tede/13412023-01-18 14:50:08.225oai:tede2: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Biblioteca Digital de Teses e Dissertaçõeshttps://tedebc.ufma.br/jspui/PUBhttp://tedebc.ufma.br:8080/oai/requestrepositorio@ufma.br||repositorio@ufma.bropendoar:21312023-01-18T17:50:08Biblioteca Digital de Teses e Dissertações da UFMA - Universidade Federal do Maranhão (UFMA)false |
dc.title.por.fl_str_mv |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x |
dc.title.alternative.eng.fl_str_mv |
Structural and thermal characterization of crystals of L-Arginine • HClxHBr1-x |
title |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x |
spellingShingle |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x PEREIRA, Adriano Bezerra L-arginina Difração de raios-X Espectroscopia Raman Transição de fase Estabilidade térmica L-arginine Raman Spectroscopy X-ray diffraction Phase transition Thermal Stability Física da Matéria Condensada |
title_short |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x |
title_full |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x |
title_fullStr |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x |
title_full_unstemmed |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x |
title_sort |
Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x |
author |
PEREIRA, Adriano Bezerra |
author_facet |
PEREIRA, Adriano Bezerra |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
SANTOS, Adenilson Oliveira dos |
dc.contributor.advisor1ID.fl_str_mv |
016.759.989-57 |
dc.contributor.authorID.fl_str_mv |
031.059.583-55 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/4194578916311023 |
dc.contributor.author.fl_str_mv |
PEREIRA, Adriano Bezerra |
contributor_str_mv |
SANTOS, Adenilson Oliveira dos |
dc.subject.por.fl_str_mv |
L-arginina Difração de raios-X Espectroscopia Raman Transição de fase Estabilidade térmica |
topic |
L-arginina Difração de raios-X Espectroscopia Raman Transição de fase Estabilidade térmica L-arginine Raman Spectroscopy X-ray diffraction Phase transition Thermal Stability Física da Matéria Condensada |
dc.subject.eng.fl_str_mv |
L-arginine Raman Spectroscopy X-ray diffraction Phase transition Thermal Stability |
dc.subject.cnpq.fl_str_mv |
Física da Matéria Condensada |
description |
Materials consisting of amino acids are of great interest in the application in nonlinear optical (NLO) and are being studied more carefully because they have properties better than the potassium dihydrogen phosphate (KDP), the material most commonly used for Second Generation Harmonic (SHG). In this work, the crystals of L-arginine hydrobromidric monohydrate (LAHBr) and L-arginine hydrochloridric monohydrate (LAHCl) were grown at room temperature (25° C) by the method of slow evaporation of solvent. Were also synthesized hydrochlorobromidric L-arginine monohydrate crystals (LAHClBr) from the mixture of the compounds in equimolar proportions 1:3, 1:1 and 3:1. These five crystals were characterized by the techniques of X-Ray Fluorescence (XRF), Diffraction X-Ray (XRD), Raman Spectroscopy, Thermogravimetry (TG), Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC). The chemical composition of the single crystal was analyzed by X-ray Fluorescence (XRF) and compositions obtained were: C6H14N4O2•HCL0.14BR0.86•H2O (LAHCl0,14Br0,86), C6H14N4 O2•HCL0.42BR0.58•H2O (LAHCl0,42Br0,58), e C6H14N4O2•HCL0.63BR0.37•H2O (LAHCl0,63Br0,37). The structural parameters of the crystals were characterized by X-ray diffraction (XRD) in association with the Rietveld refinement. The all samples crystallize with the monoclinic structure (space group P21) and the unit cell volume of LAHClxBr1-x series decreases with increasing concentration of chlorine in the composition of the samples. The vibrational modes were observed by Raman Spectroscopy. The Raman spectrum experiments have shown that bands associated with lattice modes undergo blue shifts as the concentration of chorine ion is increased in addition to complement the results obtained by XRD technique. The thermal analysis of TG, DTA and DSC showed that the crystals analyzed show a decrease in temperature of the characteristic exothermic phase transition event, as well as increasing in the melting temperature of the material, with increasing chlorine concentration. The crystals LAHBr, LAHClBr and LAHCl to lose water of hydration suffer phase transformation goes to anhydrous phase without change in structure (monoclinic-monoclinic) and present structural phase transition around 150 oC. |
publishDate |
2016 |
dc.date.issued.fl_str_mv |
2016-07-29 |
dc.date.accessioned.fl_str_mv |
2017-05-05T19:27:14Z |
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 |
PEREIRA, Adriano Bezerra. Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x. 2016. 76 f. Dissertação (Programa de Pós-Graduação em Ciência dos Materiais) - Universidade Federal do Maranhão, Imperatriz, 2016. |
dc.identifier.uri.fl_str_mv |
http://tedebc.ufma.br:8080/jspui/handle/tede/1341 |
identifier_str_mv |
PEREIRA, Adriano Bezerra. Caracterização estrutural e térmica de cristais de L-Arginina•HClxHBr1-x. 2016. 76 f. Dissertação (Programa de Pós-Graduação em Ciência dos Materiais) - Universidade Federal do Maranhão, Imperatriz, 2016. |
url |
http://tedebc.ufma.br:8080/jspui/handle/tede/1341 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal do Maranhão |
dc.publisher.program.fl_str_mv |
PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIA DOS MATERIAIS/CCSST |
dc.publisher.initials.fl_str_mv |
UFMA |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
COORDENAÇÃO DO CURSO DE CIENCIA E TECNOLOGIA - IMPERATRIZ/CCSST |
publisher.none.fl_str_mv |
Universidade Federal do Maranhão |
dc.source.none.fl_str_mv |
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Biblioteca Digital de Teses e Dissertações da UFMA |
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