Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/7806 |
Resumo: | The basic science on cements and concretes has incorporated research related to the understanding of the effects of the addition of nanosilica, and more recently functionalized nanosilicas, on the properties of cement pastes, mortars and concretes. In this context, the aim of this work was to prepare amino-functionalized nanosilicas from a commercial nanosilica (NS), provided as an aqueous colloidal suspension, by employing 3-aminopropiltrietoxissilano (APTS) as reactant, and to evaluate the characteristics of the samples. The functionalization reactions were performed in a biphasic system composed of dichloromethane and water, and employing different APTS/NS molar ratios. The materials were obtained as aqueous suspensions and their characteristics were evaluated at pH 4, 7 e 10. The functionalization of NS was evidenced by the presence of infrared bands associated to the aminopropyl group. Bands associated to silanol (-SiOH) and alcoxide (Si-OCH2CH3) groups were observed indicating that the hydrolysis and condensation reactions were not complete. The 29Si NMR signals of Si-C bonds confirmed the functionalization. The thermogravimetric curves indicated an increase of the amount of aminopropyl groups incorporated on NS as the APTS/NS ratio increased. Transmission electron microscopy images showed an increase in the mean particle sizes after functionalization. The aqueous suspended nanoparticles showed a positive zeta potential at pH 4 (+23 to +27 mV) and at pH 7 (+14 to +29 mV), indicating the presence of protonated amine groups. The zeta potential at pH 10 was weakly negative (-0.10 to -7,6 mV) for the samples prepared from the lower APTS/NS molar ratios (7.1 and 14.2 x 10-2), and still positive (+11 and +15 mV) for those prepared from the higher molar ratios (28.5 and 42.7 x 10-2), suggesting the existence of a higher amount of superficial amino groups within the latter. The mean hydrodynamic radius of the functionalized particles were greater (22 a 281 nm) than that of the NS (12 nm) at all pH values, with superior values for suspended particles at pH 10, particularly for samples prepared from the lower APTS/NS ratios. The amount of aggregates of bigger size (~100 to 2000 nm) was greater for samples prepared from the lower APTS/NS ratios. These variable characteristics are interesting for comparative studies involving the effects of the addition of these suspensions in cement pastes over the microstructure and properties of the resulting materials. |
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Sartoratto, Patrícia Pommé Confessorihttp://lattes.cnpq.br/9777959525393785Rêgo, João Henrique da SilvaMartins, Paulo Robertohttp://lattes.cnpq.br/7282834278937260Sousa, Ionara Pereira da Silva2017-09-27T11:09:36Z2017-09-15SOUSA, I. P. S. Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias. 2017. 72 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2017.http://repositorio.bc.ufg.br/tede/handle/tede/7806ark:/38995/0013000008nbsThe basic science on cements and concretes has incorporated research related to the understanding of the effects of the addition of nanosilica, and more recently functionalized nanosilicas, on the properties of cement pastes, mortars and concretes. In this context, the aim of this work was to prepare amino-functionalized nanosilicas from a commercial nanosilica (NS), provided as an aqueous colloidal suspension, by employing 3-aminopropiltrietoxissilano (APTS) as reactant, and to evaluate the characteristics of the samples. The functionalization reactions were performed in a biphasic system composed of dichloromethane and water, and employing different APTS/NS molar ratios. The materials were obtained as aqueous suspensions and their characteristics were evaluated at pH 4, 7 e 10. The functionalization of NS was evidenced by the presence of infrared bands associated to the aminopropyl group. Bands associated to silanol (-SiOH) and alcoxide (Si-OCH2CH3) groups were observed indicating that the hydrolysis and condensation reactions were not complete. The 29Si NMR signals of Si-C bonds confirmed the functionalization. The thermogravimetric curves indicated an increase of the amount of aminopropyl groups incorporated on NS as the APTS/NS ratio increased. Transmission electron microscopy images showed an increase in the mean particle sizes after functionalization. The aqueous suspended nanoparticles showed a positive zeta potential at pH 4 (+23 to +27 mV) and at pH 7 (+14 to +29 mV), indicating the presence of protonated amine groups. The zeta potential at pH 10 was weakly negative (-0.10 to -7,6 mV) for the samples prepared from the lower APTS/NS molar ratios (7.1 and 14.2 x 10-2), and still positive (+11 and +15 mV) for those prepared from the higher molar ratios (28.5 and 42.7 x 10-2), suggesting the existence of a higher amount of superficial amino groups within the latter. The mean hydrodynamic radius of the functionalized particles were greater (22 a 281 nm) than that of the NS (12 nm) at all pH values, with superior values for suspended particles at pH 10, particularly for samples prepared from the lower APTS/NS ratios. The amount of aggregates of bigger size (~100 to 2000 nm) was greater for samples prepared from the lower APTS/NS ratios. These variable characteristics are interesting for comparative studies involving the effects of the addition of these suspensions in cement pastes over the microstructure and properties of the resulting materials.A ciência básica na área de cimentos e concretos tem incorporado pesquisas relacionadas ao entendimento dos efeitos da adição de nanossílica e, mais recentemente, de nanossílica funcionalizada nas propriedades de pastas de cimento, argamassas e concretos. Neste contexto, o objetivo deste trabalho foi preparar nanossílicas funcionalizadas com grupos amina a partir de uma nanossílica comercial (NS), fornecida como uma suspensão coloidal aquosa, empregando-se o reagente 3-aminopropiltrietoxissilano (APTS) e avaliar as características das amostras obtidas. As reações de funcionalização foram realizadas em um sistema reacional bifásico constituído de diclorometano e água, empregando-se diferentes razões molares APTS/NS. Os materiais foram obtidos como suspensões aquosas, cujas características foram avaliadas em pH 4, 7 e 10. A funcionalização da NS foi evidenciada pela presença das bandas relativas ao grupo aminopropil nos espectros de infravermelho, onde também foram observadas bandas dos grupos silanol (-SiOH) e alcóxido (Si-OCH2CH3), indicando que as reações de hidrólise e condensação não foram completas. Os sinais nos espectros de RMN de 29Si característicos de ligações Si-C confirmaram a funcionalização. As curvas termogravimétricas indicaram que houve aumento no teor de grupos aminopropil incorporados à NS com o aumento da razão APTS/NS empregada. As imagens de microscopia eletrônica de transmissão mostraram um aumento do tamanho médio das partículas após a funcionalização. As nanopartículas funcionalizadas em suspensão aquosa apresentaram potencial zeta positivo em pH 4 (+23 a +27 mV) e em pH 7 (+14 a +29 mV), indicando a presença de grupos amina protonados. Já em pH 10, o potencial zeta foi fracamente negativo (-0,10 a -7,6 mV) para amostras preparadas com menor razão APTS/NS (7,1 e 14,2 x 10-2), e positivos (+11 e +15 mV) para aquelas preparadas com razão molar maior (28,5 e 42,7 x 10-2), sugerindo um maior teor de grupos amina superficiais nestas últimas. Os raios hidrodinâmicos médios das partículas funcionalizadas foram maiores (22 a 281 nm) do que o da NS (12 nm) para todos os valores de pH, com valores maiores para partículas suspensas em pH 10. O teor de agregados de maior tamanho (~100 a 2000 nm) foi maior para as amostras preparadas com menor razão APTS/NS. Essas características variadas são interessantes para estudos comparativos dos efeitos de adição dessas suspensões em pastas de cimento, sobre a microestrutura e propriedades dos materiais resultantes.Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-09-27T11:09:10Z No. of bitstreams: 2 Dissertação - Ionara Pereira da Silva Sousa - 2017.pdf: 5120392 bytes, checksum: 786f15ae0e6cf83fa9560a114e84f6a2 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-09-27T11:09:36Z (GMT) No. of bitstreams: 2 Dissertação - Ionara Pereira da Silva Sousa - 2017.pdf: 5120392 bytes, checksum: 786f15ae0e6cf83fa9560a114e84f6a2 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2017-09-27T11:09:36Z (GMT). No. of bitstreams: 2 Dissertação - Ionara Pereira da Silva Sousa - 2017.pdf: 5120392 bytes, checksum: 786f15ae0e6cf83fa9560a114e84f6a2 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-09-15application/pdfporUniversidade Federal de GoiásPrograma de Pós-graduação em Química (IQ)UFGBrasilInstituto de Química - IQ (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessNanossílica3-aminopropiltrietoxissilano nanosilicaFuncionalizaçãoFunctionalization3-aminopropyltriethoxysilaneNanosilicaCIENCIAS EXATAS E DA TERRA::QUIMICAObtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentíciasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis66369392132541515860060060078260667437411972781571700325303117195reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; charset=utf-82165http://repositorio.bc.ufg.br/tede/bitstreams/bab269ed-9ec5-4c3f-8a8c-b16d5ed9b41b/downloadbd3efa91386c1718a7f26a329fdcb468MD51CC-LICENSElicense_urllicense_urltext/plain; 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dc.title.eng.fl_str_mv |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias |
title |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias |
spellingShingle |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias Sousa, Ionara Pereira da Silva Nanossílica 3-aminopropiltrietoxissilano nanosilica Funcionalização Functionalization 3-aminopropyltriethoxysilane Nanosilica CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias |
title_full |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias |
title_fullStr |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias |
title_full_unstemmed |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias |
title_sort |
Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias |
author |
Sousa, Ionara Pereira da Silva |
author_facet |
Sousa, Ionara Pereira da Silva |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Sartoratto, Patrícia Pommé Confessori |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9777959525393785 |
dc.contributor.referee1.fl_str_mv |
Rêgo, João Henrique da Silva |
dc.contributor.referee2.fl_str_mv |
Martins, Paulo Roberto |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/7282834278937260 |
dc.contributor.author.fl_str_mv |
Sousa, Ionara Pereira da Silva |
contributor_str_mv |
Sartoratto, Patrícia Pommé Confessori Rêgo, João Henrique da Silva Martins, Paulo Roberto |
dc.subject.por.fl_str_mv |
Nanossílica 3-aminopropiltrietoxissilano nanosilica Funcionalização |
topic |
Nanossílica 3-aminopropiltrietoxissilano nanosilica Funcionalização Functionalization 3-aminopropyltriethoxysilane Nanosilica CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Functionalization 3-aminopropyltriethoxysilane Nanosilica |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
The basic science on cements and concretes has incorporated research related to the understanding of the effects of the addition of nanosilica, and more recently functionalized nanosilicas, on the properties of cement pastes, mortars and concretes. In this context, the aim of this work was to prepare amino-functionalized nanosilicas from a commercial nanosilica (NS), provided as an aqueous colloidal suspension, by employing 3-aminopropiltrietoxissilano (APTS) as reactant, and to evaluate the characteristics of the samples. The functionalization reactions were performed in a biphasic system composed of dichloromethane and water, and employing different APTS/NS molar ratios. The materials were obtained as aqueous suspensions and their characteristics were evaluated at pH 4, 7 e 10. The functionalization of NS was evidenced by the presence of infrared bands associated to the aminopropyl group. Bands associated to silanol (-SiOH) and alcoxide (Si-OCH2CH3) groups were observed indicating that the hydrolysis and condensation reactions were not complete. The 29Si NMR signals of Si-C bonds confirmed the functionalization. The thermogravimetric curves indicated an increase of the amount of aminopropyl groups incorporated on NS as the APTS/NS ratio increased. Transmission electron microscopy images showed an increase in the mean particle sizes after functionalization. The aqueous suspended nanoparticles showed a positive zeta potential at pH 4 (+23 to +27 mV) and at pH 7 (+14 to +29 mV), indicating the presence of protonated amine groups. The zeta potential at pH 10 was weakly negative (-0.10 to -7,6 mV) for the samples prepared from the lower APTS/NS molar ratios (7.1 and 14.2 x 10-2), and still positive (+11 and +15 mV) for those prepared from the higher molar ratios (28.5 and 42.7 x 10-2), suggesting the existence of a higher amount of superficial amino groups within the latter. The mean hydrodynamic radius of the functionalized particles were greater (22 a 281 nm) than that of the NS (12 nm) at all pH values, with superior values for suspended particles at pH 10, particularly for samples prepared from the lower APTS/NS ratios. The amount of aggregates of bigger size (~100 to 2000 nm) was greater for samples prepared from the lower APTS/NS ratios. These variable characteristics are interesting for comparative studies involving the effects of the addition of these suspensions in cement pastes over the microstructure and properties of the resulting materials. |
publishDate |
2017 |
dc.date.accessioned.fl_str_mv |
2017-09-27T11:09:36Z |
dc.date.issued.fl_str_mv |
2017-09-15 |
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 |
SOUSA, I. P. S. Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias. 2017. 72 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2017. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/7806 |
dc.identifier.dark.fl_str_mv |
ark:/38995/0013000008nbs |
identifier_str_mv |
SOUSA, I. P. S. Obtenção de nanossílica funcionalizada visando o uso como aditivo em misturas cimentícias. 2017. 72 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2017. ark:/38995/0013000008nbs |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/7806 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
663693921325415158 |
dc.relation.confidence.fl_str_mv |
600 600 600 |
dc.relation.department.fl_str_mv |
7826066743741197278 |
dc.relation.cnpq.fl_str_mv |
1571700325303117195 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Química (IQ) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Instituto de Química - IQ (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFG instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
instacron_str |
UFG |
institution |
UFG |
reponame_str |
Repositório Institucional da UFG |
collection |
Repositório Institucional da UFG |
bitstream.url.fl_str_mv |
http://repositorio.bc.ufg.br/tede/bitstreams/bab269ed-9ec5-4c3f-8a8c-b16d5ed9b41b/download http://repositorio.bc.ufg.br/tede/bitstreams/a7c70568-008a-4e5e-a7b6-1752135c8798/download http://repositorio.bc.ufg.br/tede/bitstreams/01e42f60-4e0c-47cf-bcaa-9bdbfbe23e9c/download http://repositorio.bc.ufg.br/tede/bitstreams/de2eda41-ff06-44ca-ba70-ff04821b83dc/download http://repositorio.bc.ufg.br/tede/bitstreams/51c029ae-86c5-473a-99ae-f0453c1a64e1/download |
bitstream.checksum.fl_str_mv |
bd3efa91386c1718a7f26a329fdcb468 4afdbb8c545fd630ea7db775da747b2f d41d8cd98f00b204e9800998ecf8427e d41d8cd98f00b204e9800998ecf8427e 786f15ae0e6cf83fa9560a114e84f6a2 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFG - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
tasesdissertacoes.bc@ufg.br |
_version_ |
1811721452975554560 |