Naslov
Lamellar to Hexagonal Columnar Liquid Crystalline Phase Transition in a Catanionic Surfactant Mixture : Dodecylammonium Chloride/Sodium Bis(2-ethylhexyl) Sulfosuccinate

Autori
Jurašin, Darija ; Vinceković, Marko ; Pustak, Anđela ; Šmit, Ivan ; Bujan, Marija ; Filipović-Vinceković, Nada

Izvornik
Soft matter (1744-683X) 9 (2013), 12; 3349-3360

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
catanionic surfactant mixtures; phase transitions; liquid crystalline phase

Sažetak
Phase transitions from a dispersed lamellar to hexagonal liquid crystalline phase have been investigated in a catanionic surfactant mixture formed by mixing a single tailed cationic surfactant, dodecylammonium chloride, with a double tailed anionic surfactant, sodium bis(2-ethylhexyl) sulfosuccinate. Depending on the bulk composition and total surfactant concentration, mixed micelles, vesicles, lamellar and hexagonal columnar liquid crystalline phases have been identified. Differences in the geometry of the two hydrophobic chains stabilized vesicles of different shapes (spherical, tubular and pearled) relative to the liquid crystalline phase even in stoichiometric mixtures. At higher surfactant concentrations the phase transition from a dispersed lamellar to hexagonal columnar liquid crystalline phase proceeds continuously, with both phases coexisting over a range of concentrations. The transition proceeds through processes of vesicle aggregation, reorganization into multilayer sheets rolled-up into tubules, and formation of a hexagonal columnar liquid crystalline phase.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA