Ferroelectric Nematic and Smectic Liquid Crystals from Tapered Molecules

Berardi, Roberto; Ricci, Matteo; Zannoni, Claudio

doi:10.1002/1439-7641(20010716)2:7<443::aid-cphc443>3.0.co;2-j

Cited by 43 publications

(19 citation statements)

References 40 publications

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“…[3] The properties of this new phase of matter are expected to be very different from those of conventional ferroelectric liquid crystals (FLCs), [1,4] which correspond to more solid-like smectic (Sm) phases, typically formed by chiral mesogens. The existence of FNLC is not forbidden from a theoretical point of view [5][6][7][8] and recent computer simulations have demonstrated polar fluid phases obtained from elongated asymmetric particles [9] with polyphilic character. [10] Unfortunately, despite years of intensive experimental quest, and claims that some achiral polymeric [11] and lyotropic [12] systems exhibit this phase, no successful demonstration of FNLCs has yet been given in low molecular weight thermotropic systems.…”

Section: Introductionmentioning

confidence: 99%

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

Francescangeli

Stanić

Torgova

et al. 2009

Adv Funct Materials

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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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Section: Introductionmentioning

confidence: 99%

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

Francescangeli

Stanić

Torgova

et al. 2009

Adv Funct Materials

Self Cite

192

170

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“…There have been many experimental and theoretical studies to determine the flexoelectric coefficients of nematic liquid crystals [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18], using a range of different approaches. For typical calamitic (rod-shaped) liquid crystals, the splay and bend flexoelectric coefficients are in the range of 3-20 pC/m.…”

Section: Introductionmentioning

confidence: 99%

Statistical mechanics of splay flexoelectricity in nematic liquid crystals

Dhakal

Selinger

2010

Phys. Rev. E

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We develop a lattice model for the splay flexoelectric effect in nematic liquid crystals. In this model, each lattice site has a spin representing the local molecular orientation, and the interaction between neighboring spins represents pear-shaped molecules with shape polarity. We perform Monte Carlo simulations and mean-field calculations to find the behavior as a function of interaction parameters, temperature, and applied electric field. The resulting phase diagram has three phases: isotropic, nematic, and polar. In the nematic phase, there is a large splay flexoelectric effect, which diverges as the system approaches the transition to the polar phase. These results show that flexoelectricity can be a statistical phenomenon associated with the onset of polar order.

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“…By augmenting the GB potential with other intermolecular interactions (e.g., electrostatic multipoles) the effect of these on the behaviour and properties of LCs may be studied. Variations of the GB model for the study of discotic,49 biaxial,50 and tapered51 molecules have also been studied. It is also possible to model systems that contain large numbers of molecules, which is vital for studying interfacial or surface phenomena.…”

Section: Computer Simulation Models Of Liquid Crystalsmentioning

confidence: 99%

Application and New Developments in Polymer‐Dispersed Liquid Crystal Simulation Studies

Jeon

Yin

Rhee

et al. 2007

Macro Theory & Simulations

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Cover:The picture on the cover shows a large crowded bottle-brush polymer (top left) with anisotropic excluded volume scaling (top right) and a bottle brush copolymer (bottom right) exhibiting local phase separation showing 1d correlation length behavior (bottom left). Further details can be found in the article by H.-P. Hsu*, W. Paul, and K. Binder on page 660. Contents ReviewCurrently there is significant interest in the use of polymer-dispersed liquid crystals in display materials. Monte Carlo simulations have been used to study PDLCs in a variety of physical situations by different research groups. This article reviews present and past simulation studies of PDLCs. Different molecular simulation techniques applied to such systems are reviewed, along with the new key findings of bulk phase transitions. Some newly developed techniques (e.g., phase separation behavior) in PDLCs are also reported. New directions for future developments in PDLC research are also highlighted.

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Ferroelectric Nematic and Smectic Liquid Crystals from Tapered Molecules

Cited by 43 publications

References 40 publications

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

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

Statistical mechanics of splay flexoelectricity in nematic liquid crystals

Application and New Developments in Polymer‐Dispersed Liquid Crystal Simulation Studies

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