| Autor: |
Werner E. L. Haas, Gary A. Dir, James E. Adams |
| Rok vydání: |
1974 |
| Předmět: |
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| Zdroj: |
Molecular Crystals and Liquid Crystals. 25:19-29 |
| ISSN: |
0026-8941 |
| DOI: |
10.1080/15421407408083401 |
| Popis: |
Several time-dependent electro-optical properties of a cholesteric-nematic mixture have been investigated. In particular, the dynamics of the Grandjean ⇆⇆ focal conic texture transitions have been characterized. A cholesteric-nematic mixture was used comprising molecules having a net tendency to align with their long axes perpendicular to the applied field, allowing the study of the field induced focal conic →→ Grandjean transition. D.C. electro-hydrodynamic effects were employed in the investigation of the Grandjean →→ focal conic transition. The driven and relaxation properties of the electro-hydrodynamic induced transition are described. Also, the memory properties of intermediate textures of this transition are discussed. Thickness is found to play a crucial role in the relaxation of the textures. The time to achieve the electro-hydrodynamic induced texture transition (Grandjean →→ focal conic) is found to be controlled in a non-linear fashion by applied voltage and only weakly by current. Fo... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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