The electroconvection in the nematic liquid crystals with short range smectic C order

Petrov, M.; Keskinova, E.; Katranchev, B.

doi:10.1016/j.molliq.2007.07.005

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…This is a self-explanatory showing the effect of chain length increase on textures. The existence of cholesteric phase in N8OBA particularly is due to electroconvection that is usually existing in nematic liquid crystals of short range Sm C order [24]. Comparatively, among all in the selected homologous series of OBA, the 8OBA has displayed short range Sm C (from 90.5 ∘ C to 98.5 ∘ C).…”

Section: Textures and Phase Transition Temperatures The Phases And Tmentioning

confidence: 96%

Dielectric Studies on Fe₃O₄Nanodopedp-n-Alkyloxybenzoic Acids

Sastry

Kumar

Vishwam

et al. 2014

Advances in Condensed Matter Physics

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The stability of phase transition temperatures and textural changes for thermotropic pure and nanodopedp-n-alkyloxybenzoic acid mesogens were aimed to study at considerable time periods. Frequency and temperature dependent dielectric constant and dielectric loss for the pure and nanodoped liquid crystals were carried out. Significant anomalies in dielectric studies were observed near phase transitions when dielectric constant and dielectric loss had been measured as a function of temperature and frequency. Changes in dielectric constant and loss were observed and there were no apparent changes at high frequencies instead maintaining constant values. The variations in conductivity, activation energy, and relaxation times had also been studied in the nematic and smectic phases. The temperature dependent dielectric constant stability (temperature coefficient of dielectric constantτε) had shown shift in the observed frequency range of thermotropic liquid crystals corresponding to the change in the dielectric constant values.

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Section: Textures and Phase Transition Temperatures The Phases And Tmentioning

confidence: 96%

Dielectric Studies on Fe₃O₄Nanodopedp-n-Alkyloxybenzoic Acids

Sastry

Kumar

Vishwam

et al. 2014

Advances in Condensed Matter Physics

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“…17 Defect-mediated chevrons have also been reported for a nematic composed of banana-like dimeric molecules and having a short range smectic order. 18 The various electroconvective chevron states discovered thus far are all exhibited by straight-core or calamitic nematogens. The reported electroconvection phase diagrams of bent core nematics [19][20][21][22][23][24][25] do not show any chevron instability, although chevrons have been reported beyond the dielectric inversion frequency for a bent-rod nematic liquid crystal.…”

Section: Introductionmentioning

confidence: 97%

Dislocations and metastable chevrons in the electroconvective inplane normal roll state of a bent core nematic liquid crystal

2014

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We report experimental results on the formation, dynamics, and annihilation of edge dislocations of opposite topological charge in the electroconvective inplane vortex state of a bent core nematic liquid crystal. The approach of paired, oppositely charged defects toward each other is a two-step process. Near constant velocity at large separation and accelerated motion close to annihilation are found, as in the case of nematic rolls belonging to standard electroconvection. Periodic arrays of dislocations of alternating polarity form upon a sudden, strong elevation of the control parameter. Chevron structures that appear between undulatory defect chains are metastable, and their decay with time is accompanied by an exponential reduction in the dislocation density. The initial periodicity of defect chains also drops exponentially with increasing field.

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Electroconvection in dimeric nematic liquid crystals with short-range smectic C order: dynamical characteristics

et al. 2011

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The electroconvection in the nematic liquid crystals with short range smectic C order

Cited by 6 publications

References 34 publications

Dielectric Studies on Fe₃O₄Nanodopedp-n-Alkyloxybenzoic Acids

Dielectric Studies on Fe₃O₄Nanodopedp-n-Alkyloxybenzoic Acids

Dislocations and metastable chevrons in the electroconvective inplane normal roll state of a bent core nematic liquid crystal

Electroconvection in dimeric nematic liquid crystals with short-range smectic C order: dynamical characteristics

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The electroconvection in the nematic liquid crystals with short range smectic C order

Cited by 6 publications

References 34 publications

Dielectric Studies on Fe3O4Nanodopedp-n-Alkyloxybenzoic Acids

Dielectric Studies on Fe3O4Nanodopedp-n-Alkyloxybenzoic Acids

Dislocations and metastable chevrons in the electroconvective inplane normal roll state of a bent core nematic liquid crystal

Electroconvection in dimeric nematic liquid crystals with short-range smectic C order: dynamical characteristics

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Dielectric Studies on Fe₃O₄Nanodopedp-n-Alkyloxybenzoic Acids

Dielectric Studies on Fe₃O₄Nanodopedp-n-Alkyloxybenzoic Acids