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Three-dimensional imaging of dielectric patterns in electrohydrodynamic convection of a nematic liquid crystal | | N Gheorghiu
; I I Smalyukh
; O D Lavrentovich
; J T Gleeson
; | | Date: |
30 Sep 2006 | | Journal: | Phys Rev E, 74 (4 Pt 1), 041702 | | Abstract: | The transition from surface to bulk normal dielectric rolls in a nematic liquid crystal is imaged by fluorescence confocal polarizing microscopy. The three-dimensional director structure and the liquid flow are scanned in both the layer plane and the transverse plane. Two systems of small-scale convective flow are formed, one at each electrode. Strong anchoring makes director oscillations difficult and charges accumulate by the Carr-Helfrich mechanism. The middle region is a structureless convection where the director oscillates with the frequency of the applied voltage. The small-scale flow eventually fills the cell from one electrode to the other as one system of thin and elongated rolls. The true dielectric mode is not a director pattern, rather a surface flow instability. | | Source: | PubMed, pmid17155073 | | Services: | Forum | Review | Favorites | |
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