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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleSpectroscopic studies of the intermolecular interactions of Congo red and tinopal CBS with modified cellulose fiberspt_BR
dc.contributor.authorYamaki, SBpt_BR
dc.contributor.authorBarros, DSpt_BR
dc.contributor.authorGarcia, CMpt_BR
dc.contributor.authorSocoloski, Ppt_BR
dc.contributor.authorOliveira, ONpt_BR
dc.contributor.authorAtvars, TDZpt_BR
unicamp.author.emailtatvars@iqm.unicamp.brpt_BR
unicamp.authorUniv Estadual Campinas, Inst Quim, BR-13084971 Campinas, SP, Brazil Univ Sao Paulo, Inst Fis, BR-13056917 Sao Carlos, SP, Brazilpt_BR
dc.subject.wosPolyelectrolyte Adsorptionpt_BR
dc.subject.wosCrystalline-structurept_BR
dc.subject.wosWhitening Agentspt_BR
dc.subject.wosFilmspt_BR
dc.subject.wosFluorescencept_BR
dc.subject.wosAzobenzenept_BR
dc.subject.wosPyrenept_BR
dc.subject.wosDyespt_BR
dc.subject.wosSaltpt_BR
dc.subject.wosStabilitypt_BR
dc.description.abstractThe adsorption of Congo red and tinopal CBS dyes on cellulose fibers was investigated using electronic absorption and fluorescence spectroscopies. Hydrogen bonds appear to be relevant for the dye-fiber interactions as indicated by the solvatochromism of Congo red in water, methanol, and dimethyl sulfoxide solutions, and when adsorbed on cellulose fibers. We also demonstrate that electrostatic interactions play an important role in the dye-medium interaction, through the analysis of absorption spectra of Congo red and fluorescence spectra of tinopal in aqueous solutions containing salt and in layer-by-layer nanostructured films with poly(allylamine hydrochloride). For instance, dye adsorption was enhanced when salt was added to the dipping solution, which was explained by the synergistic effect between the conformational changes of the cellulose and changes in the solvation layer around the cellulose chains and around dye molecules. On the basis of the fluorescence results for tinopal CBS, we inferred that dye aggregation is not relevant for adsorption on the fibers. In addition, fluorescence spectroscopy is proven very sensitive for studying the organization of dye molecules in layer-by-layer films, particularly those undergoing irreversible structural changes.pt
dc.relation.ispartofLangmuirpt_BR
dc.relation.ispartofabbreviationLangmuirpt_BR
dc.publisher.cityWashingtonpt_BR
dc.publisher.countryEUApt_BR
dc.publisherAmer Chemical Socpt_BR
dc.date.issued2005pt_BR
dc.date.monthofcirculation39234pt_BR
dc.identifier.citationLangmuir. Amer Chemical Soc, v. 21, n. 12, n. 5414, n. 5420, 2005.pt_BR
dc.language.isoenpt_BR
dc.description.volume21pt_BR
dc.description.issuenumber12pt_BR
dc.description.firstpage5414pt_BR
dc.description.lastpage5420pt_BR
dc.rightsfechadopt_BR
dc.sourceWeb of Sciencept_BR
unicamp.cruespUSPpt_BR
dc.identifier.issn0743-7463pt_BR
dc.identifier.wosidWOS:000229717900030pt_BR
dc.identifier.doi10.1021/la046842jpt_BR
dc.date.available2014-11-16T23:52:45Z
dc.date.available2015-11-26T16:32:38Z-
dc.date.accessioned2014-11-16T23:52:45Z
dc.date.accessioned2015-11-26T16:32:38Z-
dc.description.provenanceMade available in DSpace on 2014-11-16T23:52:45Z (GMT). No. of bitstreams: 1 WOS000229717900030.pdf: 158573 bytes, checksum: 90822465940541f68fbfa6b22085f3b7 (MD5) Previous issue date: 2005en
dc.description.provenanceMade available in DSpace on 2015-11-26T16:32:38Z (GMT). No. of bitstreams: 2 WOS000229717900030.pdf: 158573 bytes, checksum: 90822465940541f68fbfa6b22085f3b7 (MD5) WOS000229717900030.pdf.txt: 39123 bytes, checksum: 6d2a2fb9b3d6d61c068ab0ae6c5364ce (MD5) Previous issue date: 2005en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/72122pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/72122
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/72122-
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