Thermodynamics of the aggregation of imidazolium ionic liquids with sodium alginate or hydroxamic alginate in aqueous solution

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Federal de Sergipe (UFS)-
Autor(es): dc.contributorUniv Fed Pampa-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorFreitas, Darcson Vieira de-
Autor(es): dc.creatorKuhn, Bruna Luiza-
Autor(es): dc.creatorBender, Caroline Raquel-
Autor(es): dc.creatorFuruyama Lima, Aline Margarete [UNESP]-
Autor(es): dc.creatorLima, Marcelo de Freitas [UNESP]-
Autor(es): dc.creatorTiera, Marcio Jose [UNESP]-
Autor(es): dc.creatorKloster, Carmen Luisa-
Autor(es): dc.creatorFrizzo, Clarissa Piccinin-
Autor(es): dc.creatorVilletti, Marcos Antonio-
Data de aceite: dc.date.accessioned2022-02-22T00:09:49Z-
Data de disponibilização: dc.date.available2022-02-22T00:09:49Z-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2019-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.molliq.2019.111734-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/196562-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/196562-
Descrição: dc.descriptionIonic liquids (ILs) were examined as new components in polymer/IL mixtures for their potential applications as advanced materials. This work reports the thermodynamics of the aggregation of imidazolium ionic liquids, CnMIMBr (n = 10, 12, 14, and 16), and sodium alginate (ALG) or hydroxamic alginate (AHX) in aqueous solutions. The goal of the study was to evaluate the effect of the concentration and alkyl chain length of the ILs and the concentrations and charge density of the polysaccharides on the formation of polyelectrolyte complexes. The aggregation constant (K-agg) was determined from electrical conductivity measurements, and we found that the polymer-IL interactions increase with increasing alkyl chain length of the Rs. Furthermore, an increase in surface tension close to the critical aggregation concentration (C-2) indicates that the adsorbed layer thickness at liquid-air interface is much thicker for the AHX/CnMIMBr systems than for the ALG/CnMIMBr systems (n = 12, 14, and 16). Phase separation was observed for ILs with high hydrophobicity (n = 12,14, and 16) at zeta potentials close to zero. However, in the presence of C10MIMBr, only a slightly turbidity was observed, and the dispersion became transparent with further IL addition. The aggregation of ILs on alginate and its derivative is favorable for longer IL alkyl chains, meaning that the hydrophobic interactions act cooperatively with the electrostatic interactions in the formation of the complexes. The values of the standard Gibbs energy of aggregation (Delta G(agg)(center dot)) indicate that the interactions between C-12 MIMBr with ALG are favorable compared to those with agg AHX because the polymer charge density is higher. On the other hand, C14MIMBr and C-16 MIMBr prefer to aggregate with the more hydrophobic polymer (AHX). These outcomes highlight the role of ILs in the design of new polymer formulations. (C) 2019 Elsevier B.V. All rights reserved.-
Descrição: dc.descriptionRio Grande do Sul Foundation for Research Support (FAPERGS)-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionUniv Fed Santa Maria, Dept Quim, BR-97105900 Santa Maria, RS, Brazil-
Descrição: dc.descriptionUniv Fed Pampa, BR-97650000 Itaqui, RS, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Dept Quim & Ciencias Ambientais, IBILCE, Campus Sao Jose Da Rio Preto, BR-15054000 Sao Jose do Rio Preto, SP, Brazil-
Descrição: dc.descriptionUniv Fed Santa Maria, Dept Fis, BR-97105900 Santa Maria, RS, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Dept Quim & Ciencias Ambientais, IBILCE, Campus Sao Jose Da Rio Preto, BR-15054000 Sao Jose do Rio Preto, SP, Brazil-
Descrição: dc.descriptionRio Grande do Sul Foundation for Research Support (FAPERGS): 002023-25.51/13-2-
Descrição: dc.descriptionRio Grande do Sul Foundation for Research Support (FAPERGS): 16/2551-0000477-3-
Descrição: dc.descriptionCAPES: 001-
Descrição: dc.descriptionCNPq: 311803/2016-4-
Descrição: dc.descriptionCNPq: 306389/2018-5-
Formato: dc.format10-
Idioma: dc.languageen-
Publicador: dc.publisherElsevier B.V.-
Relação: dc.relationJournal Of Molecular Liquids-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectSodium alginate-
Palavras-chave: dc.subjectHydroxamic alginate-
Palavras-chave: dc.subjectIonic liquids-
Palavras-chave: dc.subjectAggregation-
Palavras-chave: dc.subjectInteractions-
Título: dc.titleThermodynamics of the aggregation of imidazolium ionic liquids with sodium alginate or hydroxamic alginate in aqueous solution-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

Não existem arquivos associados a este item.