The effect of chain length on the melting temperature and size of dialkyldimethylammonium bromide vesicles

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorFeitosa, E.-
Autor(es): dc.creatorJansson, J.-
Autor(es): dc.creatorLindman, B.-
Data: dc.date2014-05-20T14:02:24Z-
Data: dc.date2014-05-20T14:02:24Z-
Data: dc.date2006-07-01-
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Fonte completa do material: dc.identifierChemistry and Physics of Lipids. Clare: Elsevier B.V., v. 142, n. 1-2, p. 128-132, 2006.-
Fonte completa do material: dc.identifier0009-3084-
Fonte completa do material: dc.identifier
Fonte completa do material: dc.identifier10.1016/j.chemphyslip.2006.02.001-
Fonte completa do material: dc.identifierWOS:000238797000013-
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Fonte: dc.identifier.uri
Descrição: dc.descriptionDifferential scanning calorimetry (DSc) and dynamic light scattering (DLS) were used to obtain the gel to liquid-crystalline phase transition temperature (T-m) and the apparent hydrodynamic radius (R-h) of spontaneously formed cationic vesicles of dialkyldimethylammonium bromide salts (CnH2n+1)(2)(CH3)(2)N+center dot Br-, with varying chain lengths. The preparation of cationic vesicles from aqueous solution of these surfactants, for n = 12, 14, 16 and 18 (DDAB, DTDAB, DHDAB and DODAB, respectively), requires the knowledge of the surfactant gel to liquid-crystalline phase transition temperature, or melting temperature (T-m) since below this temperature these surfactants are poorly or not soluble in water. That series of cationic surfactants has been widely investigated as vesicle-forming surfactants, although C-12 and C-18, DDAB and DODAB are by far the most investigated from this series. The dependence of T-m of these surfactants on the number n of carbons in the surfactant tails is reported. The T-m obtained by DSC increases non-linearly with n, and the vesicle apparent radius R-h is about the same for DHDAB and DODAB, but much smaller for DDAB. (c) 2006 Elsevier B.V.. All rights reserved.-
Formato: dc.format128-132-
Idioma: dc.languageeng-
Publicador: dc.publisherElsevier B.V.-
Relação: dc.relationChemistry and Physics of Lipids-
Direitos: dc.rightsclosedAccess-
Palavras-chave: dc.subjectdialkyldimethylammonium salts-
Palavras-chave: dc.subjectcationic vesicles-
Palavras-chave: dc.subjectcationic surfactants-
Palavras-chave: dc.subjectDODAB-
Palavras-chave: dc.subjectDHDAB-
Palavras-chave: dc.subjectDTDAB-
Palavras-chave: dc.subjectDDAB-
Palavras-chave: dc.subjectphase behavior-
Palavras-chave: dc.subjectdifferential scanning calorimetry-
Palavras-chave: dc.subjectdynamic light scattering-
Palavras-chave: dc.subjectmelting temperature-
Palavras-chave: dc.subjecthydrodynamic radius-
Título: dc.titleThe effect of chain length on the melting temperature and size of dialkyldimethylammonium bromide vesicles-
Tipo de arquivo: dc.typeoutro-
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