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New Nematic Phase in Lyotropic Binary Liquid Crystals Detected by Positron Annihilation Techniquest |
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| Authors: | Sonia Millán Griselda Sánchez Luz Alicia Fucugauchi Janos H. Fendler |
| Affiliation: | 1. Unidad de Investigación Aplicada División de Aplicaciones Energéticas, Instituto Nacional de Investigaciones Nucleares , Agricultura 21. México, 11800, D. F., México;2. Instituto Nacional de Investigaciones Nucleares , México , 11800, D.F.;3. Department of Chemistry and Institute of Colloid and Surface Science , Clarkson University , Potsdam, New York, 13676;4. Department of Chemistry , Syracuse University , Syracuse, NY, 13244-1200 |
| Abstract: | A new nematic phase in lyotropic binary liquid crystalline systems consisting of sodium dodecyl sulfate-water was detected, for the first time, in the absence of additives by utilizing positron annihilation techniques. Lyotropic and thermotropic phase transitions were also investigated by the same methods. The positron annihilation parameters have also indicated a better definition of the concentration ranges at which each phase exists in the system studied. Crossed polarized light microscopy was applied to substantiate these results. |
| Keywords: | ESR order parameters smectic G correlation times |