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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/21977
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dc.contributor.authorFeitosa, E.-
dc.contributor.authorBarreleiro, PCA-
dc.contributor.authorOlofsson, G.-
dc.date.accessioned2014-05-20T14:02:21Z-
dc.date.accessioned2016-10-25T17:09:03Z-
dc.date.available2014-05-20T14:02:21Z-
dc.date.available2016-10-25T17:09:03Z-
dc.date.issued2000-04-01-
dc.identifierhttp://dx.doi.org/10.1016/S0009-3084(00)00127-4-
dc.identifier.citationChemistry and Physics of Lipids. Clare: Elsevier Sci Ireland Ltd, v. 105, n. 2, p. 201-213, 2000.-
dc.identifier.issn0009-3084-
dc.identifier.urihttp://hdl.handle.net/11449/21977-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/21977-
dc.description.abstractThe gel to liquid crystalline phase transition of the double-chained cationic dioctadecyldimethylammonium chloride and bromide (DODAX, X = Cl- or Br-) in aqueous vesicle dispersions prepared by non-sonication, sonication and extrusion has been investigated using high-sensitivity differential scanning calorimetry (DSC). The transition temperature (T-m) is a function of the preparation method, amphiphile concentration, vesicle curvature and nature of the counterion. DSC thermograms for DODAB and DODAC non-sonicated vesicle dispersions exhibit a single endothermic peak at T-m roughly independent of concentration up to 10 mM. Extrusion broadens the transition peak and shifts T-m downwards. Sonication, however, broadens slightly the transition peak and tends to shift T-m upwards suggesting that extrusion and sonication form vesicles with different characteristics. DODAC always exhibits higher T-m than DODAB irrespective of the preparation method. T-m changes as follows: T-m (sonicated) greater than or equal to T-m (non-sonicated) > T-m (extruded). Hysteresis of about 7 degrees C was observed for DODAB vesicle dispersions. (C) 2000 Elsevier B.V. Ireland Ltd. All rights reserved.en
dc.format.extent201-213-
dc.language.isoeng-
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.subjectdifferential scanning calorimetrypt
dc.subjecttransition temperaturept
dc.subjectsonicated vesiclespt
dc.subjectnon-sonicated vesiclespt
dc.subjectextruded vesiclespt
dc.titlePhase transition in dioctadecyldimethylammonium bromide and chloride vesicles prepared by different methodsen
dc.typeoutro-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniv Lund-
dc.description.affiliationUNESP, IBILCE, Dept Phys, BR-15054000 Sao Jose Rio Preto, SP, Brazil-
dc.description.affiliationUniv Lund, Ctr Chem & Chem Engn, S-22100 Lund, Sweden-
dc.description.affiliationUnespUNESP, IBILCE, Dept Phys, BR-15054000 Sao Jose Rio Preto, SP, Brazil-
dc.identifier.doi10.1016/S0009-3084(00)00127-4-
dc.identifier.wosWOS:000086633900010-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofChemistry and Physics of Lipids-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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