Simple molecular model for ferroelectric nematic liquid crystals exhibited by small rodlike mesogens

Madhusudana, N. V.

doi:10.1103/physreve.104.014704

Cited by 44 publications

(51 citation statements)

References 36 publications

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“…In the framework of a molecular model developed to describe the N F phase, the rod-like molecules are considered to possess longitudinal surface charge density waves and these interact inhibiting the formation of antiparallel structures. 37 The parallel alignment of these rods is enhanced by reducing the amplitude of the charge density wave at either end of the molecule and this is presumably achieved by the addition of the lateral fluorine substituent that removes electron density from the nitro group.…”

Section: Resultsmentioning

confidence: 99%

“…The decrease in T NI is associated with the change in structural anisotropy, whereas the increase in T N F N is attributed to the change in electron distribution within the framework of a molecular model that describes the formation of the N F phase in low molar mass materials. 37 In terms of molecular design this ability of the N F phase to tolerate bulky lateral substituents has been exploited, for example, in the design of chiral ferroelectric nematogens 29 and other functionalities may now also be incorporated.…”

Section: Discussionmentioning

confidence: 99%

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The effect of a lateral alkyloxy chain on the ferroelectric nematic phase

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The effect of a lateral alkyloxy chain on the ferroelectric nematic phase

et al. 2022

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“…Recent synthesis and evaluation [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] of new mesogens with large molecular dipoles led to a demonstration of a fluid ferroelectric nematic liquid crystal (NF) with a uniaxial polar ordering of the molecules 13,14 . The ferroelectric nature of NF has been established by polarizing optical microscopy observations of domains with opposite orientations of the polarization density vector P and their response to a direct current (dc) electric field 𝐄 13,14 .…”

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confidence: 99%

Soliton walls paired by polar surface interactions in a ferroelectric nematic liquid crystal

et al. 2022

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Surface interactions are responsible for many properties of condensed matter, ranging from crystal faceting to the kinetics of phase transitions. Usually, these interactions are polar along the normal to the interface and apolar within the interface. Here we demonstrate that polar in-plane surface interactions of a ferroelectric nematic NF produce polar monodomains in micron-thin planar cells and stripes of an alternating electric polarization, separated by $${180}^{{{{{{\rm{o}}}}}}}$$ 180 o domain walls, in thicker slabs. The surface polarity binds together pairs of these walls, yielding a total polarization rotation by $${360}^{{{{{{\rm{o}}}}}}}$$ 360 o . The polar contribution to the total surface anchoring strength is on the order of 10%. The domain walls involve splay, bend, and twist of the polarization. The structure suggests that the splay elastic constant is larger than the bend modulus. The $${360}^{{{{{{\rm{o}}}}}}}$$ 360 o pairs resemble domain walls in cosmology models with biased vacuums and ferromagnets in an external magnetic field.

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“…10–17 However, the mechanisms of stabilising the polar order are still under intensive research. 18–22 A large dipole moment, wedge-shape of the mesogens, and their dense packing are prerequisites for the ferroelectric order, resulting in breaking the molecular head–tail symmetry. 15…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17] However, the mechanisms of stabilising the polar order are still under intensive research. [18][19][20][21][22] A large dipole moment, wedge-shape of the mesogens, and their dense packing are prerequisites for the ferroelectric order, resulting in breaking the molecular head-tail symmetry. 15 One of the consequences of the ferroelectric nematic order is the instability of uniform states towards the splay state predicted theoretically.…”

Section: Introductionmentioning

confidence: 99%