Construction And The Effect Of Cosurfactant Alcohol On The Performance Of Diesel Microemulsions

Diesel microemulsions were formed by dilution with surfactant AOT,0#diesel asoil phase, pure water as water phase. Critical micelle concentration (CMC) of thediesel microemulsions was measured by the method of fluorescence probe with RhodaMine B as the fluorescent substance. According to the changes in the fluorescenceemission intensity, CMC of the diesel microemulsions was measured at5g/L.The optimal content was ascertained by studying the influence of the dosage ofsurfactant. The diesel microemulsions formed by AOT had it’s maximum watersolubility When the dosage reached0.5g AOT/10mL diesel, which is the optimalcontent. The diameter of the system formed under different dosage of AOT wascharacterized, it was shown that the diameter of the system was predominent in smallparticle under100nm when the optimal content was used.Diesel microemulsions were formed by dilution with surfactant AOT underoptimal content and five different kinds of normal alcohols, n-butanol, n-pentanol,n-hexanol, n-heptanol, n-octanol, as cosurfactant. The effects of the type of alcoholand the mass ratio of alcohol to surfactant (r) on the formation of dieselmicroemulsification were investigated. Meanwhile, the Conductivity(δ), interfacialtension(γ) and kinematic viscosity(μ) of diesel microemulsions formed under differentconditions were characterized. It was shown that percolation phenomenon occurredonly when n-butanol was used. In addition to n-butanol, the maximum content ofsolubilization water (Wo) decreased as the carbon chain lengths of alcohols increased,but increased first and then decreased as r grown; as the content of solubilizationwater (W) grown, δ increased until a stable trance was appeared, γ decreased while μincreased; as the carbon chain lengths of alcohols increased, δ decreased while γ and μincreased; as r increased, δ increased while γ and μ decreased. When n-pentanol wasadopted and r was fixed at0.4, the Wowas the highest while γ and μ were smaller，anddiesel microemulsion with superior performance were obtained.