sulfate / alkyltrimethylammonium chloride) and alcohol The phase behavior and solubilization of multiphase microemul-(whose alkyl chain length is below 3) systems.
sions in mixed anionic-cationic surfactant systems were studied
In this work, some observations on the phase diagrams of for fixed ratios of water-to-oil and surfactant-to-alcohol. In the sodium dodecyl sulfate (SDS) and cetyltrimethylammonium mixed surfactants (sodium dodecyl sulfate / cetyltrimethylambromide (CTAB) and alcohols such as 1-butanol, 1-pentamonium bromide)/heptane/alcohol/water systems, microemulnol, and 1-hexanol in equal amounts of oil (heptane) and sion and birefringent phases are formed by adjusting the surfactant water are presented. The phase behavior of both the SDS ratio e and the cationic weight fraction d. The bicontinuous (or microemulsion and CTAB microemulsion systems is well w/o microemulsion) r birefringent o/w microemulsion transition takes place and microemulsion domain enlarges with increasing established, and a considerable number of studies of multie. The optimum surfactant concentration g increases and the corphase systems where they intervene have also been presented responding optimum d decreases with increasing e and both of , CTAB (23, 24)).
them decrease with increasing the alcohol chain length from buta-
It should be noted that the system presented here is a nol to hexanol. The birefringent region shrinks rapidly with inpseudoternary one. In the absence of external fields and at creasing alcohol and/or CTAB weight fractions in total surfactant constant temperature and pressure, a quinary system H 2 O, concentration. Conductivity measurements have been performed (A); oil, (B); anionic amphiphile, (C); cationic amphiphile, in the single-phase region of the system containing mixed surfac-(D); alcohol, (E) has four independent variables, namely tants and alcohols at 25ะC. The conductivity results indicate where the four composition variables. As such we have found it a transition takes place and which of these different types of phase convenient to introduce the weight percentage of the oil in structures may be in the single-phase of the system containing anionic-cationic mixed surfactants.