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dc.contributor.authorlopes, Antonio
dc.contributor.authorEdwards, Katarina
dc.contributor.authorFeitosa, Eloi [UNESP]
dc.identifier.citationJournal of Colloid and Interface Science. San Diego: Academic Press Inc. Elsevier B.V., v. 322, n. 2, p. 582-588, 2008.
dc.description.abstractCombined dynamic and static light scattering (DLS, SLS) and cryogenic transmission electron microscopy (cryo-TEM) were used to investigate extruded cationic vesicles of dioctadecyldimethylammonium chloride and bromide (DODAX, X being Cl- or Br-). In salt-free dispersions the mean hydrodynamic diameter, D-h, and the weight average molecular weight, M-w, are larger for DODAB than for DODAC vesicles, and both D-h and M-w increase with the diameter (phi) of the extrusion filter. NaCl (NaBr) decreases (increases) the DODAB (DODAC) vesicle size, reflecting the general trend of DODAB to assemble as larger vesicles than DODAC. The polydispersity index is lower than 0.25, indicating the dispersions are rather polydisperse. Cryo-TEM micrographs show that the smaller vesicles are spherical while the larger ones are oblong or faceted, and the vesicle samples are fairly polydisperse in size and morphology. They also indicate that the vesicle size increases with phi and DODAB assembles as larger vesicles than DODAC. Lens-shaped vesicles were observed in the extruded preparations. Both light scattering and cryo-TEM indicate that the vesicle size is larger or smaller than phi when phi is smaller or larger than the optimal phi* approximate to 200 nm. (C) 2008 Elsevier B.V. All rights reserved.en
dc.publisherAcademic Press Inc. Elsevier B.V.
dc.relation.ispartofJournal of Colloid and Interface Science
dc.sourceWeb of Science
dc.subjectCationic vesicleen
dc.subjectextruded vesicleen
dc.subjectlens-shaped vesicleen
dc.subjectlight scatteringen
dc.titleExtruded vesicles of dioctadecyldimethylammonium bromide and chloride investigated by light scattering and cryogenic transmission electron microscopyen
dcterms.rightsHolderAcademic Press Inc. Elsevier B.V.
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniv Nova Lisboa
dc.contributor.institutionUppsala Univ
dc.description.affiliationUNESP, IBILCE, Dept Phys, Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUniv Nova Lisboa, Inst Tecnol Quim & Biol, Oeiras, Portugal
dc.description.affiliationUppsala Univ, Dept Phys Chem, Uppsala, Sweden
dc.description.affiliationUnespUNESP, IBILCE, Dept Phys, Sao Jose do Rio Preto, SP, Brazil
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt
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