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Liquid crystals formed in sodium alkyl sulfates-water systems studied by positron annihilation techniques |
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| Authors: | Rafael Lopez Luz Alicia Fucugauchi J H Fendler |
| Institution: | (1) Unidad de Proyectos Especiales, Division de Investigatión y Desarrollo, Institute Nacional de Investigaciones Nucleares, Apartado Postal 18-1027, México 11 801, D.F., Mexico;(2) Department of Chemistry, Syracuse University, 13244-1200 Syracuse, NY, USA |
| Abstract: | Lyotrophic phase transitions were investigated in liquid crystalline systems of sodium alkyl sulfate-water. The positron annihilation parameters indicated the presence of a nematic phase in sodium dodecyl sulfate water-system in absence of additives. The effect of the hydrocarbon chain-length and unsaturation of the surfactant on the nematic phase formation were also studied. Liquid crystals of sodium 10-undecenoate were polymerized by ultraviolet irradiation. Polymerization is seen to cause a gradual change from the hexagonal to the lamellae phase.This research is in furtherance of the USA-Mexico Cooperative Science Program through the National Science Foundation and the Consejo Nacional de Ciencia y Tecnología |
| Keywords: | liquid crystals positron annihilation sodium alkyl sulfates |
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