Thermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beads

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dc.contributor.authorda Silva Fernandes, Renan [UNESP]
dc.contributor.authorde Moura, Márcia Regina [UNESP]
dc.contributor.authorGlenn, Greg M.
dc.contributor.authorAouada, Fauze Ahmad [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionWRRC
dc.date.accessioned2018-12-11T17:20:45Z
dc.date.available2018-12-11T17:20:45Z
dc.date.issued2018-09-01
dc.description.abstractPolymeric 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.en
dc.description.affiliationGrupo 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 Solteira
dc.description.affiliationBioproduct Research Unit USDA-ARS WRRC
dc.description.affiliationUnespGrupo 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 Solteira
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipUniversidade Estadual Paulista
dc.description.sponsorshipIdFAPESP: 2013/03643-0
dc.description.sponsorshipIdCNPq: 405680/2016-3
dc.format.extent327-336
dc.identifierhttp://dx.doi.org/10.1016/j.molliq.2018.06.005
dc.identifier.citationJournal of Molecular Liquids, v. 265, p. 327-336.
dc.identifier.doi10.1016/j.molliq.2018.06.005
dc.identifier.file2-s2.0-85048273416.pdf
dc.identifier.issn0167-7322
dc.identifier.lattes8251270609012225
dc.identifier.orcid0000-0002-6870-6961
dc.identifier.scopus2-s2.0-85048273416
dc.identifier.urihttp://hdl.handle.net/11449/176425
dc.language.isoeng
dc.relation.ispartofJournal of Molecular Liquids
dc.relation.ispartofsjr0,849
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectHydrogels
dc.subjectNanoclay
dc.subjectNanocomposites
dc.subjectSodium alginate
dc.subjectZeolite
dc.titleThermal, microstructural, and spectroscopic analysis of Ca2+ alginate/clay nanocomposite hydrogel beadsen
dc.typeArtigo
unesp.author.lattes8251270609012225[4]
unesp.author.orcid0000-0002-6870-6961[4]

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Artigos - Física e Química - FEIS