Influence of the bias-voltage on the anchoring energy for nematic liquid crystals

Barbero, Giovanni; Olivero, D.; Scaramuzza, Nicola; Strangi, Giuseppe; Versace, C.

doi:10.1103/physreve.69.021713

Cited by 27 publications

(18 citation statements)

References 24 publications

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“…Expression (2) shows that coupling of E E s with dielectric anisotropy gives the rise to F s renormalizing finite anchoring energy [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

Yaroshchuk

Kovalchuk

Kravchuk

2005

Molecular Crystals and Liquid Crystals

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The frequency of dipole relaxation of liquid crystal (LC) layer at LC-solid interface, f r , is shown to be in full correlation with the polar anchoring energy W p ; the increase of W p is accompanied with the decrease of f r . This correlation is established by the use of the aligning polyimide layers treated with different methods. The anchoring energy increases and the relaxation frequency decreases in the following sequence of processes: rubbing-photoalignment-plasma beam alignment. The correlation between W p and f r is an evidence of strong contribution of dipole-to-dipole interaction at the LC-substrate interface to polar anchoring of LC. Based on this correlation new method of polar anchoring measurement can be developed.

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“…Expression (2) shows that coupling of E E s with dielectric anisotropy gives the rise to F s renormalizing finite anchoring energy [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

Yaroshchuk

Kovalchuk

Kravchuk

2005

Molecular Crystals and Liquid Crystals

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“…This occurs in the one-constant approximation, K ϳ K 11 ϳ K 33 . 23 The freeenergy density can now be derived from the following energy function:…”

Section: Discussionmentioning

confidence: 99%

Reverse tilt domains in liquid crystal cells with a splayed director configuration

Lee

Yoon

Kim

et al. 2006

Journal of Applied Physics

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When an electric field is applied to a nematic liquid crystal cell with splay alignment layers, which is realized by mechanical parallel rubbing, the system exhibits abnormal reverse tilt domains. Even though the system has pretilt angle due to symmetry breaking by rubbing, existence of singular point in a cell by splay geometry and shift of that by locally asymmetric pretilt angle configurations result in the abnormal reverse tilt domains. On the basis of Oseen-Frank theory, dependence of singular point upon the abnormal reverse tilt domains is theoretically investigated for a splay alignment liquid crystal cell. By using the Dickman's Q-tensor method ͓SID Int. Symp. Digest Tech. Papers 24, 638 ͑1993͔͒, liquid crystal director field is calculated for the splay-aligned liquid crystal cell that an electric field is applied to. We presume a model to explain the abnormal reverse tilt domains, and derive the conditions required for the generation and elimination of these domains.

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“…Furthermore, from Eqs. (11), the characteristic times connected with the evolution of 1± and 2± depend on t± and d± .…”

Section: ͑9͒mentioning

confidence: 96%

“…From Eqs. (11) it follows that in the steady state, where d ± / dt = 0, for t → ϱ, the surface densities of adsorbed ions are…”

Section: ͑9͒mentioning

confidence: 99%

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Influence of the ions on the dynamical response of a nematic cell submitted to a dc voltage

et al. 2004

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The influence of the ions present in a liquid crystal on the dynamical response of a nematic slab submitted to a dc voltage is studied. The evolution of the system toward the equilibrium state is investigated by solving the continuity equation for the electric charge, taking into account the current of drift and of diffusion. Our analysis shows that the formation of the double layers close to the electrodes strongly modifies the distribution of the electric field across the sample. We evaluate the surface polarization due to the ions movements and the contribution to the anisotropic part of the surface energy having a dielectric origin. We show also that, even if the optical response of the liquid crystal is a slow phenomenon, the distribution of the ionic charge is rather fast. Consequently, the presence of the ions cannot be neglected in the determination of the flexoelectric coefficients when the nematic sample is submitted to a square wave having a period of the order of 1 s.

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Influence of the bias-voltage on the anchoring energy for nematic liquid crystals

Cited by 27 publications

References 24 publications

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

Reverse tilt domains in liquid crystal cells with a splayed director configuration

Influence of the ions on the dynamical response of a nematic cell submitted to a dc voltage

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