Phase Behavior in Mixtures of Cationic Dimeric and Anionic Monomeric Surfactants (CROSBI ID 136283)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Jurašin, Darija ; Weber, Igor ; Filipović-Vinceković, Nada
engleski
Phase Behavior in Mixtures of Cationic Dimeric and Anionic Monomeric Surfactants
The formation of mixed aggregates has been investigated in the mixture of oppositely charged surfactants vastly differing in molecular geometry and size. The systems considered is mixture of the cationic gemini surfactant, ethanediyl-1, 2-bis(dodecyldimethylammonium bromide), and anionic surfactant, sodium dodecyl sulfate. Various mixed nano- and microaggregates (micelles, vesicles, thin lamellar sheets, and tubules) were formed depending on bulk composition and total surfactant concentration. Two types of aggregates were found in precipitate, the tubules as prevailing aggregates on the gemini-rich side, and vesicles as prevailing aggregates on the SDS-rich side. The tubules formation was ascribed to mutual influence of specific structure of cationic dimeric surfactant and electrostatic interactions at the bilayer/solution interface. The proposed mechanism involved the formation of lamellar sheets, which rolled-up into tubules.
gemini surfactants ; catanionic surfactant mixtures ; vesicles ; sodium dodecyl sulfate ; tubules
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Podaci o izdanju
30 (5)
2009.
622-633
objavljeno
0193-2691
1532-2351
10.1080/01932690802598481