The phase diagram of the lyotropic nematic mesophase in the TTAB/NaBr/water system

dc.creatorDe Melo, AA
dc.creatorAmadeu, NS
dc.creatorFujiwara, FY
dc.date2007
dc.date2014-07-30T19:00:00Z
dc.date2015-11-26T17:49:59Z
dc.date2014-07-30T19:00:00Z
dc.date2015-11-26T17:49:59Z
dc.date.accessioned2018-03-29T00:33:07Z
dc.date.available2018-03-29T00:33:07Z
dc.identifierLiquid Crystals. Taylor & Francis Ltd, v. 34, n. 6, n. 683, n. 691, 2007.
dc.identifier0267-8292
dc.identifierWOS:000246812300004
dc.identifier10.1080/02678290701343059
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/72229
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/72229
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1289543
dc.descriptionThe phase diagram of the nematic mesophase present in the tetradecyltrimethylammonium bromide/sodium bromide/water ternary system was determined. A calamitic nematic mesophase ( N-C) was observed which extends to very high concentrations of electrolyte. The order parameters of the surfactant head group in the mesophases were studied by the NMR quadrupolar splitting of the deuterated surfactant. On increasing the temperature of nematic mesophases with low electrolyte concentrations, a phase separation occurs with the formation of a more highly ordered hexagonal phase and an isotropic phase. Diffusion measurements of the isotropic micellar solution by the NMR PFG method were used to estimate hydrodynamic radii at low surfactant concentrations and to study micelle diffusion as the concentration of the surfactant was increased to the liquid crystalline region. At higher surfactant concentrations, the diffusion coefficient reached a limiting value. The calamitic nematic mesophase in this surfactant/electrolyte/water system appears to be formed by long wormlike micelles.
dc.description34
dc.description6
dc.description683
dc.description691
dc.languageen
dc.publisherTaylor & Francis Ltd
dc.publisherAbingdon
dc.publisherInglaterra
dc.relationLiquid Crystals
dc.relationLiq. Cryst.
dc.rightsfechado
dc.rightshttp://journalauthors.tandf.co.uk/permissions/reusingOwnWork.asp
dc.sourceWeb of Science
dc.subjectNuclear-spin-relaxation
dc.subjectLiquid-crystals
dc.subjectWormlike Micelles
dc.subjectSelf-diffusion
dc.subjectTransition
dc.subjectOrder
dc.subjectAnisotropy
dc.subjectBehavior
dc.subjectDecanol
dc.subjectSize
dc.titleThe phase diagram of the lyotropic nematic mesophase in the TTAB/NaBr/water system
dc.typeArtículos de revistas


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