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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleChemisorption and thermodynamic data of the interaction between a chelate free acidic center with basic groups attached to grafted silicaspt_BR
dc.contributor.authorArakaki, LNHpt_BR
dc.contributor.authorde Sousa, ANpt_BR
dc.contributor.authorEspinola, JGPpt_BR
dc.contributor.authorOliveira, SFpt_BR
dc.contributor.authorAiroldi, Cpt_BR
unicamp.authorUniv Fed Paraiba, CCEN, Dept Quim, BR-58059900 Joao Pessoa, Paraiba, Brazil Univ Estadual Campinas, Inst Quim, BR-13081970 Campinas, SP, Brazilpt_BR
dc.subjectsilica gelpt_BR
dc.subjectbeta-diketonatespt_BR
dc.subjectchemisorptionpt_BR
dc.subjectcalorimetrypt_BR
dc.subjectthermodynamic datapt_BR
dc.subject.wosGelpt_BR
dc.subject.wosCationspt_BR
dc.subject.wosAdsorptionpt_BR
dc.subject.wosSeparationpt_BR
dc.subject.wosCatalysispt_BR
dc.subject.wosReagentspt_BR
dc.subject.wosSurfacept_BR
dc.description.abstractThe molecule 2-aminoethanethiol was added to the grafted silylant agent [(3-chlorosilylpropyl)trimethoxysilane] (cpts) onto silica gel(dropSil-Cl), obtaining a surface (dropSil-SNH2) and giving 0.70 mmol g(-1) of nitrogen; the surface of silica was modified with [(3-mercaptosilylpropyl)trimethoxysilane] (mpts) with surface (dropSil-SH), giving 0.78 mmol g(-1) of sulphur. Both matrices, (dropSil-SNH2) and (dropSil-SH), adsorb copper and cobalt acetylacetonates from ethanolic solution. Adsorption, using a batch-wise process, showed that copper chelate was the most adsorbed. The interactions between the basic centers attached to organic chains of these modified silicas with the cations in the chelates Me(acac)(2) [M = Cu and Co] were followed through calorimetric titrations. Exothermic enthalpic results were obtained for the dropSil-SNH2 matrix. The spontaneity of these systems was reflected in negative free Gibbs energy and positive from entropic values. (C) 2002 Elsevier Science (USA).pt
dc.relation.ispartofJournal Of Colloid And Interface Sciencept_BR
dc.relation.ispartofabbreviationJ. Colloid Interface Sci.pt_BR
dc.publisher.citySan Diegopt_BR
dc.publisher.countryEUApt_BR
dc.publisherAcademic Press Inc Elsevier Sciencept_BR
dc.date.issued2002pt_BR
dc.date.monthofcirculationMAY 15pt_BR
dc.identifier.citationJournal Of Colloid And Interface Science. Academic Press Inc Elsevier Science, v. 249, n. 2, n. 290, n. 294, 2002.pt_BR
dc.language.isoenpt_BR
dc.description.volume249pt_BR
dc.description.issuenumber2pt_BR
dc.description.firstpage290pt_BR
dc.description.lastpage294pt_BR
dc.rightsfechadopt_BR
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policypt_BR
dc.sourceWeb of Sciencept_BR
dc.identifier.issn0021-9797pt_BR
dc.identifier.wosidWOS:000175431600004pt_BR
dc.identifier.doi10.1006/jcis.2002.8290pt_BR
dc.date.available2014-11-18T04:56:09Z
dc.date.available2015-11-26T17:46:39Z-
dc.date.accessioned2014-11-18T04:56:09Z
dc.date.accessioned2015-11-26T17:46:39Z-
dc.description.provenanceMade available in DSpace on 2014-11-18T04:56:09Z (GMT). No. of bitstreams: 1 WOS000175431600004.pdf: 140721 bytes, checksum: cf73c469d2c6bd92e6aa7ba1d6bd71a0 (MD5) Previous issue date: 2002en
dc.description.provenanceMade available in DSpace on 2015-11-26T17:46:39Z (GMT). No. of bitstreams: 2 WOS000175431600004.pdf: 140721 bytes, checksum: cf73c469d2c6bd92e6aa7ba1d6bd71a0 (MD5) WOS000175431600004.pdf.txt: 22381 bytes, checksum: 3d85a55658fedbad0cb3be50ea65e08e (MD5) Previous issue date: 2002en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/63053pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/63053
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/63053-
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