2011
DOI: 10.1103/physreve.83.041704
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Nonstandard electroconvection in a bent-core oxadiazole material

Abstract: Electroconvection (EC) phenomena have been investigated in the nematic phase of a bent-core oxadiazole material with negative dielectric anisotropy and a frequency dependent conductivity anisotropy. The formation of longitudinal roll (LR) patterns is one of the predominant features observed in the complete frequency and voltage range studied. At voltages much above the LR threshold, various complex patterns such as the "crisscrossed" pattern, bimodal varicose, and turbulence are observed. Unusually, the nonsta… Show more

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Cited by 30 publications
(33 citation statements)
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“…This implies that above a certain frequency, for a given temperature (for example 5 kHz at T−TN-DC= −4 K), the domains that appear above Eth2 disappear at lower fields than is observed for lower frequencies. The decrease of Eth3 as the frequency increases could be related to the conductivity anisotropy of the sample, which changes sign as function of frequency and temperature [34].…”
Section: Electric Field Behaviour 321 Polarising Optical Microscopymentioning
confidence: 99%
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“…This implies that above a certain frequency, for a given temperature (for example 5 kHz at T−TN-DC= −4 K), the domains that appear above Eth2 disappear at lower fields than is observed for lower frequencies. The decrease of Eth3 as the frequency increases could be related to the conductivity anisotropy of the sample, which changes sign as function of frequency and temperature [34].…”
Section: Electric Field Behaviour 321 Polarising Optical Microscopymentioning
confidence: 99%
“…Southern et al [33] employed polarised Raman spectroscopy to show that this material, in the absence of external electric or magnetic fields, exhibits non-zero values for the biaxial order parameters in the lower temperature regime of the nematic phase. Kaur et al [34] studied the electro-convection (EC) phenomena and observed unusual EC patterns in the nematic phase. The splay (K11), twist (K22) and bend (K33) elastic constants have been measured across the entire nematic regime of this material and found to follow the relationship K22<K33<K11, in common with many (but not all) BCLCs [35,36].…”
Section: Physical Properties Of the Liquid Crystalmentioning
confidence: 99%
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“…The nematic phase of this material exhibits some unusual physical properties. Several studies indicate that there are two distinctive (possibly uniaxial and biaxial) regimes in the nematic phase [30][31][32]. Also, the nematic phase shows low splay (K 11 ), twist (K 22 ) and bend (K 33 ) elastic constants compared to other members in the homologues series [33,34].…”
Section: Properties Of the Materialsmentioning
confidence: 99%
“…Although new LC phases such as biaxial nematic [1][2][3] and polar nematic phases [4] have been proposed, the most interesting physical properties found thus far are large flexoelectricity, [5] unusual elastic constants, [6,7] large dielectric permittivity, [8] anomalous electroconvection [9,10] and high ordinary refractive index, [7] which have been reported for nonpolar uniaxial nematic LC phases formed from bent-core materials.…”
Section: Introductionmentioning
confidence: 99%