Critical Phenomena In Nonaqueous Microemulsions

The pseudo ternary phase diagrams of the four-component system glycerol, sodium dodecyl sulfate, hexanol and decane with the weight ratio of hexanol to decane equal to 100/0, 90/10, 75/25, 50/50, and 25/75 were determined at 30°C. The systems gave only isotropic solutions and no liquid crystalline phases. The nonaqueous regions corresponding to the W/O microemulsion region in aqueous systems suggested critical behavior as demonstrated by the convergence of tie lines and by light scattering intensity which gave a pronounced maximum at the point of converging tie lines. This maximum was transferred to higher glycerol/hexanol ratios with added surfactant and to smaller ratios with added decane. Viscosity measurements were made for the solutions on the demixing line. There were no anomalous viscosity values around the points of converging tie lines. © 1987

A Non-aqueous Lamellar Liquid Crystal With An Ionic Surfactant-long Chain Alcohol Combination

A non-aqueous lamellar liquid crystal of sodium dodecyl sulfate, decanol and glycerol was prepared and compared with its aqueous counterpart. The results show that the stability of the liquid crystal with glycerol is critically dependent on the surfactant/alcohol ratio, whereas the liquid cry. The interlayer spacing was smaller for the glycerol system than for the water system at finite amount of solvent, but the value extrapolated to zero so. © 1986

Non-Aqueous Lyotropic Liquid Crystals From Amphiphiles

Most of the literature on lyotropic liquid crystals of moderate size amphiphilic molecules has been concerned with aqueous systems; the only exception being the early observation by Winsor that some amphiphiles formed liquid crystals in their native state at room temperature. Recently, a whole series of liquid crystalline structures has been introduced in which water has been replaced with a polar organic solvent to bring the mesomorphic state. A short review is given about the structure and dynamics in such systems. © 1987, Taylor & Francis Group, LLC. All rights reserved