| Autor: |
Tsvetkov, N.V., Zuev, V.V., Andreeva, L.N., Kurakina, V.O., Ksenofontov, I.V. |
| Zdroj: |
Molecular Crystals and Liquid Crystals; August 2001, Vol. 366 Issue: 1 p203-210, 8p |
| Abstrakt: |
AbstractUsing the method of threshold Frederick's transitions in magnetic field were determined the values of splay orientational elastic constants K11of the nematic trimers 4,4′-bis-[ω-(4-cyanobiphenyl-4′-yloxy)alkyloxy]biphenyls with the number nof CH2groups in their spacers from 3 to 10. The dramatic odd-even effect in the dependence-of K11versus nfor trimers was evaluated. This effect is mainly due to the oscillations of the degree of intermolecular orientational order in the series of the compounds under investigation. Using the values of K11the values of the dielectric anisotropy Δε of nematic trimers were calculated. The data obtained for trimers were compared with the same characteristics for dimers (4,4′-bis-cyanobiphenyloxyalkanes). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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