Molecular Engineering for Ferroelectricity in Liquid Crystals

Guillon, Daniel

doi:10.1002/9780470141724.ch1

Cited by 5 publications

(1 citation statement)

References 109 publications

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“…Indeed, the idea of using bowl-shaped molecules has been around for quite some time, particularly to try and build achiral ferroelectric liquid crystal materials. [5][6][7][8][9] In that case, the expectation is that if each bowlic molecule has an axial dipole, they should pile up head-to-tail, yielding a macroscopic column dipole. The formation of an hexagonal columnar phase, as often found in columnar discotics, would ensure an overall ferroelectric order.…”

Section: Introductionmentioning

confidence: 99%

Columnar liquid crystals formed by bowl-shaped mesogens. A Monte Carlo study

2008

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We have investigated the stacking of model bowlic mesogens, and the nematic and columnar liquid crystal phases they form upon cooling-down from an isotropic liquid. Starting from an attractiverepulsive interaction obtained by generalising the Gay-Berne pair potential to bowlic shapes, we have performed extensive off-lattice Monte Carlo NPT computer simulations of samples of various sizes: N ¼ 1024, 8192, and 32 000 particles. We have examined in particular the length of the polar domains formed and their polydispersity, and characterised in detail the structure of the packing defects terminating the columns.

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Section: Introductionmentioning

confidence: 99%

Columnar liquid crystals formed by bowl-shaped mesogens. A Monte Carlo study

2008

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Ferroelectric Response and Induced Biaxiality in the Nematic Phase of Bent‐Core Mesogens

Francescangeli

Stanić

Torgova

et al. 2009

Adv Funct Materials

192

170

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The still undiscovered fluid ferroelectric nematic phase is expected to exhibit a much faster and easier response to an external electric field compared to conventional ferroelectric smectic liquid crystals; therefore, the discovery of such a phase could open new avenues in electro‐optic device technology. Here, experimental evidence of a ferroelectric response to a switching electric field in a low molar mass nematic liquid crystal is reported and connected with field‐induced biaxiality. The fluid is made of bent‐core polar molecules and is nematic over a range of 120 °C. Combining repolarization current measurements, electro‐optical characterizations, X‐ray diffraction and computer simulations, ferroelectric switching is demonstrated and it is concluded that the response is due to field‐induced reorganization of polar cybotactic groups within the nematic phase. This work represents significant progress toward the realization of ferroelectric fluids that can be aligned at command with a simple electric field.

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Towards a new class of ferroelectric liquid crystal molecules for nonlinear optical applications

Soldera

Theberge

2003

Liquid Crystals

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Molecular Engineering for Ferroelectricity in Liquid Crystals

Cited by 5 publications

References 109 publications

Columnar liquid crystals formed by bowl-shaped mesogens. A Monte Carlo study

Columnar liquid crystals formed by bowl-shaped mesogens. A Monte Carlo study

Ferroelectric Response and Induced Biaxiality in the Nematic Phase of Bent‐Core Mesogens

Towards a new class of ferroelectric liquid crystal molecules for nonlinear optical applications

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