Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.molliq.2018.06.005 http://hdl.handle.net/11449/176425 |
Resumo: | Polymeric hydrogels are important biomaterials with potential for various applications including the controlled release of drugs. Clay and zeolite nanostructures can enhance the absorption and release properties of hydrogels. In our previous work, a procedure was optimized for making hydrogel beads. The objectives of this study were to use the optimized bead forming procedure to prepare clay and zeolite nanocomposite hydrogel beads and characterize their microstructure, thermal and chemical properties. The hydrogels were prepared by dripping solutions of either sodium alginate or sodium alginate/nanostructure (clay and/or zeolite) into beakers containing different concentrations of CaCl2 at 25 °C. Fourier transform infrared spectroscopy (FTIR) analysis detected the presence of functional groups associated with alginate, clay and zeolite. The microstructure of the alginate beads was somewhat rough with small protrusions. Flakes were visible in micrographs of beads containing nanoclay. The elemental composition of the hydrogels was investigated by energy dispersive X-ray spectrometry (EDX). EDX spectra revealed magnesium, sodium, aluminum, silicon and increased the levels of oxygen in the nanoclay compositions. The incorporation of nanoclays decreased the percentage of organic matter lost as detected by thermogravimetric analysis (TG). TG was also able to detect the incorporation of nanoclay in hydrogels. The nanoclays proved to be more effective than zeolites in producing alginate hydrogels with satisfactory swelling characteristics. |
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Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beadsHydrogelsNanoclayNanocompositesSodium alginateZeolitePolymeric hydrogels are important biomaterials with potential for various applications including the controlled release of drugs. Clay and zeolite nanostructures can enhance the absorption and release properties of hydrogels. In our previous work, a procedure was optimized for making hydrogel beads. The objectives of this study were to use the optimized bead forming procedure to prepare clay and zeolite nanocomposite hydrogel beads and characterize their microstructure, thermal and chemical properties. The hydrogels were prepared by dripping solutions of either sodium alginate or sodium alginate/nanostructure (clay and/or zeolite) into beakers containing different concentrations of CaCl2 at 25 °C. Fourier transform infrared spectroscopy (FTIR) analysis detected the presence of functional groups associated with alginate, clay and zeolite. The microstructure of the alginate beads was somewhat rough with small protrusions. Flakes were visible in micrographs of beads containing nanoclay. The elemental composition of the hydrogels was investigated by energy dispersive X-ray spectrometry (EDX). EDX spectra revealed magnesium, sodium, aluminum, silicon and increased the levels of oxygen in the nanoclay compositions. The incorporation of nanoclays decreased the percentage of organic matter lost as detected by thermogravimetric analysis (TG). TG was also able to detect the incorporation of nanoclay in hydrogels. The nanoclays proved to be more effective than zeolites in producing alginate hydrogels with satisfactory swelling characteristics.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Universidade Estadual PaulistaGrupo de Compósitos e Nanocompósitos Híbridos (GCNH) Department of Physics and Chemistry Programa de Pós-Graduação em Ciência dos Materiais São Paulo State University (Unesp) School of Engineering, Ilha SolteiraBioproduct Research Unit USDA-ARS WRRCGrupo de Compósitos e Nanocompósitos Híbridos (GCNH) Department of Physics and Chemistry Programa de Pós-Graduação em Ciência dos Materiais São Paulo State University (Unesp) School of Engineering, Ilha SolteiraFAPESP: 2013/03643-0CNPq: 405680/2016-3Universidade Estadual Paulista (Unesp)WRRCda Silva Fernandes, Renan [UNESP]de Moura, Márcia Regina [UNESP]Glenn, Greg M.Aouada, Fauze Ahmad [UNESP]2018-12-11T17:20:45Z2018-12-11T17:20:45Z2018-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article327-336application/pdfhttp://dx.doi.org/10.1016/j.molliq.2018.06.005Journal of Molecular Liquids, v. 265, p. 327-336.0167-7322http://hdl.handle.net/11449/17642510.1016/j.molliq.2018.06.0052-s2.0-850482734162-s2.0-85048273416.pdf82512706090122250000-0002-6870-6961Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Molecular Liquids0,849info:eu-repo/semantics/openAccess2024-07-10T14:08:09Zoai:repositorio.unesp.br:11449/176425Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:59:57.768982Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads |
title |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads |
spellingShingle |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads da Silva Fernandes, Renan [UNESP] Hydrogels Nanoclay Nanocomposites Sodium alginate Zeolite |
title_short |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads |
title_full |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads |
title_fullStr |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads |
title_full_unstemmed |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads |
title_sort |
Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads |
author |
da Silva Fernandes, Renan [UNESP] |
author_facet |
da Silva Fernandes, Renan [UNESP] de Moura, Márcia Regina [UNESP] Glenn, Greg M. Aouada, Fauze Ahmad [UNESP] |
author_role |
author |
author2 |
de Moura, Márcia Regina [UNESP] Glenn, Greg M. Aouada, Fauze Ahmad [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) WRRC |
dc.contributor.author.fl_str_mv |
da Silva Fernandes, Renan [UNESP] de Moura, Márcia Regina [UNESP] Glenn, Greg M. Aouada, Fauze Ahmad [UNESP] |
dc.subject.por.fl_str_mv |
Hydrogels Nanoclay Nanocomposites Sodium alginate Zeolite |
topic |
Hydrogels Nanoclay Nanocomposites Sodium alginate Zeolite |
description |
Polymeric hydrogels are important biomaterials with potential for various applications including the controlled release of drugs. Clay and zeolite nanostructures can enhance the absorption and release properties of hydrogels. In our previous work, a procedure was optimized for making hydrogel beads. The objectives of this study were to use the optimized bead forming procedure to prepare clay and zeolite nanocomposite hydrogel beads and characterize their microstructure, thermal and chemical properties. The hydrogels were prepared by dripping solutions of either sodium alginate or sodium alginate/nanostructure (clay and/or zeolite) into beakers containing different concentrations of CaCl2 at 25 °C. Fourier transform infrared spectroscopy (FTIR) analysis detected the presence of functional groups associated with alginate, clay and zeolite. The microstructure of the alginate beads was somewhat rough with small protrusions. Flakes were visible in micrographs of beads containing nanoclay. The elemental composition of the hydrogels was investigated by energy dispersive X-ray spectrometry (EDX). EDX spectra revealed magnesium, sodium, aluminum, silicon and increased the levels of oxygen in the nanoclay compositions. The incorporation of nanoclays decreased the percentage of organic matter lost as detected by thermogravimetric analysis (TG). TG was also able to detect the incorporation of nanoclay in hydrogels. The nanoclays proved to be more effective than zeolites in producing alginate hydrogels with satisfactory swelling characteristics. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-11T17:20:45Z 2018-12-11T17:20:45Z 2018-09-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.molliq.2018.06.005 Journal of Molecular Liquids, v. 265, p. 327-336. 0167-7322 http://hdl.handle.net/11449/176425 10.1016/j.molliq.2018.06.005 2-s2.0-85048273416 2-s2.0-85048273416.pdf 8251270609012225 0000-0002-6870-6961 |
url |
http://dx.doi.org/10.1016/j.molliq.2018.06.005 http://hdl.handle.net/11449/176425 |
identifier_str_mv |
Journal of Molecular Liquids, v. 265, p. 327-336. 0167-7322 10.1016/j.molliq.2018.06.005 2-s2.0-85048273416 2-s2.0-85048273416.pdf 8251270609012225 0000-0002-6870-6961 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Molecular Liquids 0,849 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
327-336 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808129480391131136 |