Low electric-field-induced switching in the B1 bent-core liquid crystal phase

Kirchhoff, J.; Hirst, Linda S.; Fergusson, Kenneth M.; Hird, Michael

doi:10.1063/1.2724774

Cited by 11 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the wide angle region a diffuse scattering ∼4.6Å corresponding to the liquidlike in-plane ordering could be observed. The spacings obtained from reflections lying orthogonal to the equatorial plane could be indexed as (11) and (22) whereas the reflection at an angle could be indexed as (02). This indexing scheme shows that the rectangular blocks in the surface aligned sample may be tilted with respect to the substrate similar to what was proposed in [16].…”

Section: A Optical Observationsmentioning

confidence: 99%

“…Field-induced lamellar phases SmC S P F and M x have been observed to be formed from ferro-(col rF ) and antiferroelectric (col rAF ) columnar phases [10]. An electric-field-induced change from the B 1 phase into a texture with small randomly oriented domains that switch between dark and bright states, has been attributed to a possible transition into a SmCP phase [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electric-field-induced switchable dark conglomerate phases in a bent-core liquid crystal exhibiting reverse columnar phases

Srinivasan²,

Bk³

et al. 2013

Phys. Rev. E

View full text Add to dashboard Cite

Electric-field-induced transitions into switchable dark conglomerate (DC) phases from two types of reverse columnar mesophases have been observed in the bent-core (BC) compound 2,7-naphthylene bis[4-(3-methyl-4-n-tetradecyloxybenzoyloxy)] benzoate. Optical and x-ray studies show that the higher temperature columnar phase corresponds to the orthogonal B(1rev) phase, whereas the lower temperature columnar phase is a variant of the B(1revtilt) phase. As the layer fragments in this phase are modulated in order to relieve the steric hindrance caused by an anticlinic tilting in adjacent blocks, it has been named B(1revtiltM). The shape of the chiral domains are different in the DC phases viz. DC-B(1rev) and DC-B(1revtiltM) obtained by applying the electric field in the B(1rev) and B(1revtiltM) phases, respectively. While the chiral domains in the DC-B(1rev) phase appear similar to those observed in other DC phases, the shape of the domains in the DC-B(1revtiltM) phase appear to have some similarity to the domains in the banana leaf texture in the B(1revtiltM) phase implying that the detailed structure in this DC phase may be different. Optical observations, electro-optics, and dielectric studies show that the DC-B(1rev) and DC-B(1revtiltM) phases are both switchable and possess a local SmC(S)P(F) type of structure. As the temperature is decreased the switching behavior changes from ferroelectric to antiferroelectric. The temperature at which this changeover starts occurring coincides with the temperature at which the layer modulation occurs to overcome anticlinic tilt and the B(1rev) to B(1revtiltM) phase transition takes place without the application of the electric field. The change in switching behavior is attributed to a transformation into flat layers with the SmC(A)P(A) type of structure as also evidenced by the nucleation of bright regions alongside the chiral domains.

show abstract

Section: A Optical Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electric-field-induced switchable dark conglomerate phases in a bent-core liquid crystal exhibiting reverse columnar phases

Srinivasan²,

Bk³

et al. 2013

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…On the other hand, the switching performance often depends on the frequency and shape of the applied voltage. There are several examples of this behavior reported in the literature [5][6][7]. In the majority of them the phase transition is detected on the basis of texture observation.…”

Section: Introductionmentioning

confidence: 99%

Electric-field-induced phase transitions in bent-core mesogens determined by x-ray diffraction

et al. 2011

View full text Add to dashboard Cite

The changes in the x-ray diffraction diagram induced by an electric field have been studied in four bent-core liquid crystals. Two of the compounds present columnar B 1 phases and the other two show dark conglomerate (DC) structures. In the B 1 materials the electric field gives rise to switchable phases whose diffraction pattern is that of the smectic C polar (SmCP) phase. In the DC structures the positions of the Bragg reflections remain essentially unaltered, but in one of the compounds the peaks become narrower under field, indicating that the correlation length of the smectic order increases. A slight enhancement of the smectic spacing is found in the DC phases upon field application.

show abstract

“…While T c wasFig. 27Textures of (a) BP*, (b) B1, (c) TGBA*, and (d) twist bend nematic phases observed by POM [128][129][130][131].…”

mentioning

confidence: 99%

Recent synthetic advances in pyridine-based thermotropic mesogens

Devadiga

Ahipa

2019

RSC Adv.

View full text Add to dashboard Cite

show abstract

Low electric-field-induced switching in the B1 bent-core liquid crystal phase

Cited by 11 publications

References 10 publications

Electric-field-induced switchable dark conglomerate phases in a bent-core liquid crystal exhibiting reverse columnar phases

Electric-field-induced switchable dark conglomerate phases in a bent-core liquid crystal exhibiting reverse columnar phases

Electric-field-induced phase transitions in bent-core mesogens determined by x-ray diffraction

Recent synthetic advances in pyridine-based thermotropic mesogens

Contact Info

Product

Resources

About