Microemulsion formation and phase behavior of anionic and cationic surfactants with sodium dodecyl sulfate and cetyltrimethylammonium bromide
- Northwest Normal Univ., Lanzhou, Gansu (China). Dept. of Chemistry
The phase behavior and solubilization of multiphase microemulsions in mixed anionic-cationic surfactant systems were studied for fixed ratio of water-to-oil and surfactant-to-alcohol. In the mixed surfactants (sodium dodecyl sulfate + cetyltrimethylammonium bromide)/heptane/alcohol/water systems, microemulsions and birefringement phases are formed by adjusting the surfactant ratio {epsilon} and the cationic weight fraction {delta}. The bicontinuous (or w/o microemulsion) {yields} birefringement o/w microemulsion transition takes place and microemulsion domain enlarges with increasing {epsilon}. The optimum surfactant concentration {gamma} increases and the corresponding optimum {delta} decreases with increasing {epsilon} and both of them decrease with increasing the alcohol chain length butanol to hexanol. The birefringent region shrinks rapidly with increasing alcohol and/or CTAB weight fractions in total surfactant concentration. Conductivity measurements have been performed in the single-phase region of the system containing mixed surfactants and alcohols at 25 C. The conductivity results indicate where a transition takes place and which of these different types of phase structures may be in the single-phase of the system containing anionic-cationic mixed surfactants.
- OSTI ID:
- 404603
- Journal Information:
- Journal of Colloid and Interface Science, Vol. 184, Issue 1; Other Information: PBD: 1 Dec 1996
- Country of Publication:
- United States
- Language:
- English
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