The results in Fig. 1 demonstrate that under identical compositions for single phase microemulsion formation, a larger amount of Brij-010 (HLB = 12.4) was required for reverse micellar microemulsions to solubilize all components, compared to those of oleyl alcohol, stearyl alcohol, and methyl oleate. These results show that atthe same C18 carbon chain length, the EO groups directly affectthe hydrophobicity of the system because they increase the polarity of the surfactant [25]. The Bancroft’ Rule states that the increasing hydrophilicity of a surfactant increases the amount of the surfactant needed to obtain reverse micellar microemulsion[11,16]. However, the results show that miscibility phase behavioris not affected by an unsaturated group in the surfactant structure as compared with a saturated surfactant. A related study [16] of fatty alcohol/1-hexanol/methanol systems has yielded analogous results. Hence, the results from this study were as expected.