Phase behavior, topology, and growth of neutral catanionic reverse micelles.
The ternary catanionic system octylammoniumoctanoate/octane/water is studied by combined SANS, light scattering, conductivity, and phase diagram approach in the water-poor microemulsion region. The sphere-to-cylinder growth and branching depends on the concentration, the water-to-surfactant ratio, and the temperature. The unidimensional growth leads to a network of interconnected wormlike micelles. Like most studied linear nonionic surfactants, in this true catanionic system at equimolarity of anionic and cationic surfactant, the curvature toward water increases with temperature, making connections between cylinders less frequent.
Abécassis
Benjamin
B
LIONS - CEA Saclay 9119, Gif-Sur-Yvette, France. benjamin.abecassis@cea.fr
Testard
Fabienne
F
Arleth
Lise
L
Hansen
Steen
S
Grillo
Isabelle
I
Zemb
Thomas
T
D000838:Anions / Q000737:chemistry; D002412:Cations / Q000737:chemistry; D004655:Emulsions / Q000737:chemistry*; D008823:Micelles; D008832:Microchemistry; D009795:Octanes / Q000737:chemistry; D044367:Phase Transition; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
D000838:Anions; D002412:Cations; D004655:Emulsions; D008823:Micelles; D009795:Octanes; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; D014867:Water