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Aver'yanov, E. M.
Spectral properties of calamitic and discotic nematics, associated with the difference in their local symmetry / E. M. Aver'yanov // J. Opt. Technol. - 1998. - Vol. 65, Is. 7. - P. 515-523. - Cited References: 40 . - ISSN 1070-9762

РУБ Optics
Рубрики:
LIQUID-CRYSTALS
ALIGNMENT
Аннотация: This paper discusses how the features of the local symmetry of calamitic and discotic nematic liquid crystals, the orientational ordering of the molecules, the polarization of intramolecular transitions, and the resonance intermolecular interactions (local-field effects) affect the polarized absorption spectra of these objects. It is shown that the difference of the local symmetry of calamitic and discotic nematics manifests itself in observable qualitative differences in their spectral properties. The published (controversial) experimental data are explained. (C) 1998 The Optical Society of America.

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Аверьянов, Евгений Михайлович
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Aver'yanov, E. M.
Spectral properties of calamitic and discotic nematics, associated with the difference in their local symmetry / E. M. Aver'yanov // Journal of Optical Technology (A Translation of Opticheskii Zhurnal). - 1998. - Vol. 65, Is. 7. - P. 515-523 . - ISSN 1070-9762
Кл.слова (ненормированные):
Crystal symmetry -- Light absorption -- Light polarization -- Resonance -- Calamitic nematics -- Discotic nematics -- Nematic liquid crystals
Аннотация: This paper discusses how the features of the local symmetry of calamitic and discotic nematic liquid crystals, the orientational ordering of the molecules, the polarization of intramolecular transitions, and the resonance intermolecular interactions (local-field effects) affect the polarized absorption spectra of these objects. It is shown that the difference of the local symmetry of calamitic and discotic nematics manifests itself in observable qualitative differences in their spectral properties. The published (controversial) experimental data are explained. В© 1998 The Optical Society of America.

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Аверьянов, Евгений Михайлович
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Aver'yanov, E. M.
Correlation of the molecular structure of discotic nematic liquid crystals with their orientational order and specific features of the nematic-isotropic phase transition / E. M. Aver'yanov // Phys. Solid State. - 2004. - Vol. 46, Is. 8. - P. 1554-1559, DOI 10.1134/1.1788794. - Cited References: 32 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MONTE-CARLO
   ANISOTROPIC SYSTEMS
   COMPUTER-SIMULATION
   BEHAVIOR
   TRIPHENYLENE
   DISCOGEN
   MESOGEN
   FIELD
Аннотация: The orientational order parameter S of molecules in high-temperature discotic nematic liquid-crystal phases of triphenylene derivatives is investigated as a function of the length of side flexible molecular chains at different temperatures. It is established that the orientational order parameters S in the range of the transition from the nematic phase to the isotropic liquid phase (the N-D-I transition) are smaller than those predicted from the molecular-statistical theory and computer simulation. It is shown that the N-D-I transition is close to both the isolated Landau point and the tricritical point (regardless of the chemical structure of the molecules and the anisotropy of dispersion intermolecular interactions). Consistent explanations are offered for a number of experimental findings, such as the anomalously small changes in the enthalpy and entropy upon the N-D-I transition (as compared to those revealed upon the N-I transition in calamitic nematic liquid crystals), the anomalously strong response of the isotropic phase of discotic nematic liquid crystals to external fields (thermodynamically conjugate to the order parameter S) and the long relaxation times of this response, and the formation of cybotactic discotic molecular clusters in the isotropic phase in the vicinity of the N-D-I transition. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

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Аверьянов, Евгений Михайлович
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Experimental solution of the local-field problem in discotic liquid crystals / E. M. Aver'yanov [et al.] // JETP Letters. - 1999. - Vol. 70, Is. 1. - P. 29-35, DOI 10.1134/1.568125. - Cited References: 14 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
ORDER
Аннотация: Polarized light-absorption spectra are obtained for single-domain planar-oriented samples of the discotic D-ho. Previously predicted spectral effects induced by resonant dipole-dipole interactions of the molecules are observed. New methods for determining the parameters of the local field in the D-ho phase are developed which take into account the mixing of the molecular excitations. It is shown that the two-dimensional crystalline ordering of the molecular columns decreases the anisotropy of the local field for this phase. (C) 1999 American Institute of Physics. [S0021-3640(99)00613-1].

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660036, Russia
Ivanovo State Univ, Ivanovo 153025, Russia
ИФ СО РАН

Доп.точки доступа:
Aver'yanov, E. M.; Аверьянов, Евгений Михайлович; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Korets, A. Y.; Akopova, O. B.
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Aver'yanov, E. M.
Long-Range Orientational Order, Local-Field Anisotropy, and Mean Molecular Polarizability in Liquid Crystals / E. M. Aver'yanov // J. Exp. Theor. Phys. - 2009. - Vol. 108, Is. 1. - P. 176-186, DOI 10.1134/S106377610901021X. - Cited References: 35 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
REFRACTIVE-INDEXES
OPTICAL ANISOTROPY
Кл.слова (ненормированные):
Anisotropy -- Crystal symmetry -- Crystals -- Electric fields -- Light sources -- Liquid crystals -- Liquids -- Molecules -- Tensors -- Biaxial liquid crystals -- Calamitic -- Discotic -- Discotic liquid crystals -- Experimental datum -- Field models -- Lorentz -- Mesoscopic -- Molecular polarizability -- Orientational orders -- Phase state -- Nematic liquid crystals
Аннотация: The problems on the relation of the mean effective molecular polarizability (gamma) over bar to the long-range orientational order of molecules (the optical anisotropy of the medium) in uniaxial and biaxial liquid crystals, the local anisotropy on mesoscopic scales, and the anisotropy of the Lorentz tensor L and the local-field tensor f are formulated and solved. It is demonstrated that the presence of the long-range orientational order of molecules in liquid crystals imposes limitations from below on the molecular polarizability (gamma) over bar, which differs for uniaxial and biaxial liquid crystals. The relation between the local anisotropy and the molecular polarizability (gamma) over bar is investigated for calamitic and discotic uniaxial liquid crystals consisting of lath- and disk-shaped molecules. These liquid crystals with identical macroscopic symmetry differ in the local anisotropy and the relationships between the components L(parallel to) L(perpendicular to,) f(parallel to) > f(perpendicular to) (discotic) for an electric field oriented parallel and perpendicular to the director. The limitations from below and above on the molecular polarizability (gamma) over bar due to the anisotropy of the tensors L and f are established for liquid crystals of both types. These limitations indicate that the molecular polarizability (gamma) over bar depends on the phase state and the temperature. The factors responsible for the nonphysical consequences of the local-field models based on the approximation (gamma) over bar = const are revealed. The theoretical inferences are confirmed by the experimental data for a number of calamitic nematic liquid crystals with different values of birefringence and the discotic liquid crystal Col(ho).

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аверьянов, Евгений Михайлович
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    Аверьянов, Евгений Михайлович.
    Температурное поведение показателей преломления дискотических нематиков с высоким двупреломлением / Е. М. Аверьянов // Жидк. кристаллы и их практич. использ. - 2018. - Т. 18, № 3. - С. 37-44 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2018.3.37. - Библиогр.: 29 . - ISSN 1991-3966. - ISSN 2499-9644
   Перевод заглавия: Temperature behavior of refractive indices of discotic nematics with high birefringence

РУБ Crystallography
Рубрики:
IN-SITU PHOTOPOLYMERIZATION
LIQUID-CRYSTALS
ANISOTROPIC FILMS
Кл.слова (ненормированные):
дискотические нематики -- температурное поведение показателей преломления -- discotic nematics -- temperature behavior of refractive indices
Аннотация: Температурное поведение показателей преломления nj(t) и величин = (n|| + 2n⊥)/3, n(t) = ε1/2, ε = (ε|| + 2ε⊥)/3, εj = nj2 для световых волн с поляризацией вдоль (j = ||) и нормально директору (j = ⊥) в дискотических нематиках ND исследовано в рамках микроскопического подхода с учетом анизотропии тензора локального поля fj(t) =1 + Lj(t)[εj(t) – 1] и тензора Лорентца Lj(t). Показано, что известные отрицательные производные ' = d/dt, и точка te минимума на зависимости n||(t) в нематиках ND отвечают малым и средним значениям двупреломления Δn = n|| – n⊥. Для ЖК с высокими величинами Δn и компонентами L⊥, меньшими порогового значения Δn(to), предсказаны два новых эффекта: положительные значения ',n', и наличие точки максимума to на зависимости n⊥(t). Установлена связь to с величиной Δn(to) и зависимостью Δn(λ) от длины световой волны λ. Выяснены особенности перехода от объектов с точкой te к объектам с точкой to по мере роста Δn. Указаны молекулы, для которых можно ожидать наличия предсказанных эффектов. Отмечена роль этих эффектов в улучшении визуальных характеристик дисплеев с нематиком ND в граничной компенсирующей пленке.
Temperature behavior of refractive indices nj(t) and values of = (n|| + 2n⊥)/3, n(t) = ε1/2, ε= (ε|| + 2ε⊥)/3, εj = nj2 for the light waves polarized along (j = ||) and across (j = ⊥) the director in discotic nematics ND was studied within the microscopic approach with accounting for the anisotropy of the local-field tensor fj(t) =1 + Lj(t)[εj(t) – 1] and the Lorentz tensor Lj(t). The known negative derivatives ' = d/dt, and the point te of minimum at the dependence n||(t) for nematics ND were shown to correspond to small and medium values of the birefringence Δn = n|| – n⊥. For nematics ND with high values of Δn and components L⊥ less than the threshold value L⊥o(nj), two new effects were predicted: positive derivatives ',n' and the presence of the maximum point to at the dependence n⊥(t). The correlation of to with the magnitude of Δn(to) and the dependence Δn(λ) on the light wavelength λ was established. The features of the transition from objects with point te to objects with point to under gradual increase of Δn were cleared up. The molecules were pointed for which one could expect the presence of the predicted effects. The role of these effects in the improvement of visual characteristics of liquid crystal displays with nematic ND in the boundary compensation film was observed.

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Держатели документа:
Институт физики им. Л. В. Киренского, ФИЦ КНЦ СО РАН, Академгородок, 50, 660036 Красноярск, Россия

Доп.точки доступа:
Aver'yanov, E. M.

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