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dc.contributor.authorMartins, Ricardo Martins dept_BR
dc.contributor.authorSilva, Carolina A. dapt_BR
dc.contributor.authorBecker, Cristiane Miottopt_BR
dc.contributor.authorSamios, Dimitriospt_BR
dc.contributor.authorBica, Clara Ismeria Damianipt_BR
dc.contributor.authorChristoff, Marcelopt_BR
dc.date.accessioned2010-04-16T09:10:34Zpt_BR
dc.date.issued2002pt_BR
dc.identifier.issn0104-1428pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/19545pt_BR
dc.description.abstractAbstract: Fluorescence probing, viscosity and light scattering measurements have been combined to study the aggregation of different anionic surfactants mainly in dilute solutions (0.5% w/v) of (hydroxypropyl)cellulose (HPC MW 173,000), in moderate ionic strength (NaCl 0.1 mol.L-1). The set of surfactants includes natural cholesterol derivatives, sodium cholate (CS) and sodium deoxycholate (DC), and the alkylsulphate, sodium dodecylsulphate (SDS). At 298 K the critical surfactant concentration related to aggregate/HPC formation (C1) decreases for SDS and DC whereas it increases slightly for CS. At 312 K the C1 values for CS and DC are slightly shifted toward higher values whereas it is not changed for SDS. All surfactant/HPC systems increase C1 values as the HPC concentration increases to 1.2%. Above C1 the viscosity increases for all surfactant/HPC systems but it is sharper in the increasing order CS, DC and SDS. The hydrodynamic behavior indicates that CS induces higher diffusion to HPC than SDS and DC. The aggregation in the surfactant/HPC systems is analyzed through the feature of surfactant/aggregate structure (size, charge density, etc).en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofPolímeros (São Carlos): ciência e tecnologia. São Carlos, SP. Vol. 12, n. 2 (abr./jun. 2002), p. 109-114pt_BR
dc.rightsOpen Accessen
dc.subjectAggregateen
dc.subjectSurfactantes aniônicospt_BR
dc.subjectBile salten
dc.subjectEspalhamento de luzpt_BR
dc.subjectHydrophobicen
dc.subject(Hydroxypropyl) Celluloseen
dc.subjectFluorescenceen
dc.subjectLight scatteringen
dc.subjectViscosityen
dc.titleStudies on anionic surfactant structure in the aggregation with (hydroxypropyl)cellulosept_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000333608pt_BR
dc.type.originNacionalpt_BR


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