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Citation: Hu Shang-Lin, Jia Xiao-Fei, Dai Le-Rong. Phase Behavior of Mixed Aqueous Solution of Octyltrimethylamonium Bromide and Sodium Octyl Sulfate[J]. Acta Physico-Chimica Sinica, ;2002, 18(10): 920-923. doi: 10.3866/PKU.WHXB20021011 shu

Phase Behavior of Mixed Aqueous Solution of Octyltrimethylamonium Bromide and Sodium Octyl Sulfate

1.
College of Chemistry and Molecular Engineering, Peking University, Beijing　100871

Received Date: 7 February 2002
Available Online: 15 October 2002

The phase behavior of aqueous mixture of octyltrimethylamonium bromide (OTAB) and sodium octyl sulfate (SOS)was studied. In concentrated solution, a liquid crystal phase formed and converted form hexan nal structure to lamellar when the molar ratio of OTAB/SOS approached to 1.The mixed surfactant solution is a homogeneous and transparent liquid in middle concentration range. When the concentration is low, aqueous two-phase system appears in a wide range of OTAB/SOS molar ratio. In the aqueous surfactant two phase system, both vesicles and micelles exist in the surfactant-poor phase, while concentrated vesicle aggregates were contained in the surfactant-rich phase. Solubilization amount of oil-soluble dye in the surfactant-rich phase is much higher than that in the surfactant-poor phase.
- Mixed cationic-anionic surfactant;Phase behavior;Liquid crystal;　Aqueous two phase;Vesicles
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