Back to Search
Start Over
Flexoelectricity and competition of time scales in electroconvection
- Publication Year :
- 2008
- Publisher :
- arXiv, 2008.
-
Abstract
- Novel behavior in electroconvection (EC) has been detected in nematic liquid crystals (NLCs) under the condition of comparable timescales of the director relaxation and the period of the driving ac voltage. The studied NLCs exhibit standard EC (s-EC) at the onset of the instability, except one compound in which nonstandard EC (ns-EC) has been detected. In the relevant frequency region, the threshold voltage for conductive s-EC bends down considerably, while for dielectric s-EC it bends up strongly with the decrease of the driving frequency. We show that inclusion of the flexoelectric effect into the theoretical description of conductive s-EC leads to quantitative agreement, while for dielectric s-EC a qualitative agreement is achieved. The frequency dependence of the threshold voltage for ns-EC strongly resembles that of the dielectric s-EC.<br />Comment: 13 pages, 14 figures, submitted
- Subjects :
- Materials science
Condensed matter physics
business.industry
Flexoelectricity
Pattern formation
FOS: Physical sciences
Dielectric
Condensed Matter - Soft Condensed Matter
Instability
Threshold voltage
Optics
Liquid crystal
Relaxation (physics)
Soft Condensed Matter (cond-mat.soft)
business
Electrical conductor
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....005d18dd3d37c610d127faf818d5a993
- Full Text :
- https://doi.org/10.48550/arxiv.0804.0515