Jian-jun Lu

Interfacial Composition and Structural Parameters of Aqueous NaCl(HCl/NaOH)/CnmimBr/1-Pentanol/n-Octane Microemulsions

Abstract The interfacial composition, thermodynamic properties and structure parameters of the W/O microemulsion systems containing alkyl-3-methyl imidazolium bromide (CnmimBr, n = 12, 14, 16)/1-pentanol/n-octane/aqueous NaCl (HCl or NaOH) have been studied by a dilution method. The molar solubility of 1-pentanol in oil phase (Xoa) and the molar fraction of 1-pentanol at the interfacial layer (Xia) were obtained from the dilution equation of the W/O microemulsions. Furthermore, the distribution constant K of 1-pentanol between the interfacial layer and the bulk oil phase was determined, along with the standard Gibbs’ free energy change of transferring alcohol from the continuous oil phase to the interfacial layer, –ΔGoo→i. Some structure parameters related to the microemulsion droplets were also calculated. The effects of NaCl, HCl and NaOH on the properties and structures of the W/O microemulsions were also explored. It was found that as the content of the aqueous NaCl (HCl and NaOH) increases, Xoa and Xia would decrease, the formation of the microemulsion would be more thermodynamically spontaneous, and the radius of the water pool significantly increases.

Phase Behaviour of the Microemulsion Systems Formed by the Composite Surfactants Alkyl Polyglucoside and Sodium Dodecyl Sulfate

Abstract The phase behavior of microemulsions containing composite surfactants of non-ionic alkyl polyglucoside and anionic sodium dodecyl sulfate was studied by the ∊-β fishlike phase diagram method. In microemulsion systems APG(SDS)/alcohol/alkane/water, there exists an obvious synergistic effect in terms of the composition of the interfacial layer and the solubilization ability. In the interfacial layer the number of surfactant and alcohol molecules notably decrease, resulting in a significant improvement in the solubilization ability of the system. The effects of alcohols, alkanes and salinity on the ∊-β fishlike phase diagrams of APG/SDS/alcohol/alkane/brine microemulsion systems were also discussed.

Interfacial composition and solubilization of microemulsion systems containing mixed surfactants C12mimBr and Brij35: effects of surfactant composition, temperature, and salinity

AbstractThe composition of the interfacial layer and solubilization of the microemulsions containing mixed cationic and nonionic surfactants (C12mimBr-Brij35) were studied and compared based on the mass and the number of moles of the surfactants, respectively. As XC12mimBr

Phase Behavior of Alcohol-Free Microemulsion Systems Containing Butyric Acid as a Cosurfactant

{X}_{C_{12}\mathrm{mimBr}}

Effect of Alkane/Water Ratios on the Phase Behavior and the Solubilization of Microemulsion Systems Containing Hexadecyltrimethylammonium Bromide

(mole fractions of C12mimBr in C12mimBr-Brij35 mixture) increases, the total masses of the surfactants (mSs

Effect of the Composition of Mixed Oils on the Phase Behavior and Solubilization Ability of Microemulsion Systems

{m}_S^s