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    Ориентационный переход в слое нематика с гомеотропно-коническими граничными условиями, индуцированный ионной модификацией поверхностного сцепления / В. С. Сутормин, М. Н. Крахалев, О. О. Прищепа, В. Я. Зырянов // Жидк. крист. и их практич. использ. - 2022. - Т. 22, № 3. - С. 105-110 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2022.3.105. - Библиогр.: 4. - В.С. Сутормин, М.Н. Крахалев и О.О. Прищепа благодарят за поддержку грант РФФИ, Правительства Красноярского края и Красноярского краевого фонда науки в рамках научного проекта № 20-42-240007 . - ISSN 1991-3966. - ISSN 2499-9644
   Перевод заглавия: Orientational transition in nematic layer with homeotropic-conical boundary conditions induced by ionic modification of surface anchoring
Кл.слова (ненормированные):
нематик -- ионный сурфактант -- поверхностное сцепление -- конические граничные условия -- конфигурация директора -- оптическая текстура -- nematic -- ionic surfactant -- surface anchoring -- conical boundary conditions -- director configuration -- optical texture
Аннотация: Исследована трансформация ориентационной структуры в слое нематика с гомеотропно-коническими граничными условиями, индуцированная электроуправляемой ионной модификацией поверхностного сцепления. Обнаружено, что изменение азимутального угла директора на подложке с коническим сцеплением возможно осуществить путем модификации граничных условий на второй подложке.
The transformation of the orientational structure induced by the electrically controlled ionic modification of surface anchoring in the nematic layer with homeotropic-conical boundary conditions has been considered. It has been found that the change in the azimuthal angle of director at the substrate with conical anchoring can be realized by modification of boundary conditions at the second substrate.

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Держатели документа:
Институт физики им. Л. В. Киренского, ФИЦ КНЦ СО РАН, Красноярск, Россия
Институт инженерной физики и радиоэлектроники, Сибирский федеральный университет, Красноярск, Россия

Доп.точки доступа:
Сутормин, Виталий Сергеевич; Sutormin, V. S.; Крахалев, Михаил Николаевич; Krakhalev, M. N.; Прищепа, Оксана Олеговна; Prishchepa, O. O.; Зырянов, Виктор Яковлевич; Zyryanov, V. Ya.

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Untwisting of the helical structure of cholesteric droplets with homeotropic surface anchoring / M. N. Krakhalev [et al.] // JETP Letters. - 2017. - Vol. 105, Is. 1. - P. 51-54, DOI 10.1134/S002136401701012X. - Cited References:35. - This work was supported in part by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Region (project no. 16-42-240704r_a). The work of A.V.E on the theoretical analysis of the structure of liquid crystal droplets was supported by the Russian Science Foundation (project no. 16-43-03010). The work of Jui-Hsiang Liu was supported by the Ministry of Science and Technology of Taiwan (contract no. MOST105-2923-E-006-007). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTAL DROPLETS
   CYLINDRICAL CAVITIES
   TRANSITION
   KNOTS
Аннотация: Cholesteric droplets dispersed in a polymer with homeotropic surface anchoring are studied. A director configuration with the bipolar distribution of the axis of the helix is formed in droplets. The untwisting of the helical structure (i.e., an increase in the pitch of the helix) is experimentally observed at a decrease in the size of droplets. This dependence is analyzed for liquid crystal droplets with various concentrations of the chiral addition. A proposed empirical relation describes well the correlation of the helix pitch and the size of droplets in the studied samples.

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Публикация на русском языке Раскрутка спиральной структуры капель холестерика с гомеотропным поверхностным сцеплением [Текст] / М. Н. Крахалев [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2017. - Т. 105 Вып. 1-2. - С. 43-46

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.
Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Emel'yanenko, A. V.; Liu, Jui-Hsiang; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Foundation for Basic Research; Government of the Krasnoyarsk Region [16-42-240704r_a]; Russian Science Foundation [16-43-03010]; Ministry of Science and Technology of Taiwan [MOST105-2923-E-006-007]
}
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Transformation of cholesteric orientational structures and optical textures induced by the electric field–driven ionic modification of surface anchoring / V. S. Sutormin [et al.] // Bull. Russ. Acad. Sci. Phys. - 2017. - Vol. 81, Is. 5. - P. 602-604, DOI 10.3103/S1062873817050239. - Cited References: 8 . - ISSN 1062-8738
Кл.слова (ненормированные):
Cholesteric liquid crystals -- Liquid crystals -- Dc electric field -- Helical pitch -- Homeotropic alignment -- Ionic modification -- Liquid crystal cells -- Optical texture -- Orientational structure -- Surface-anchoring -- Electric fields
Аннотация: The reorientation of a cholesteric liquid crystal with a large helical pitch induced by the electric field–driven modification of surface anchoring is investigated. In the initial state, the liquid crystal cell has a homeotropic alignment of the director. An applied dc electric field produced a twisted homeoplanar structure of the cholesteric. © 2017, Allerton Press, Inc.

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Публикация на русском языке Трансформация ориентационных структур и оптических текстур холестерика, индуцированная электроуправляемой ионной модификацией поверхностного сцепления [Текст] / В. С. Сутормин [и др.] // Изв. РАН. Сер. физич. - 2017. - Т. 81 № 5. - С. 649-652

Держатели документа:
Kirensky Institute of Physics, Federal Research Center–Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sutormin, V. S.; Сутормин, Виталий Сергеевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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    Toroidal Configuration of a Cholesteric Liquid Crystal in Droplets with Homeotropic Anchoring / M. N. Krakhalev [et al.] // JETP Letters. - 2019. - Vol. 109, Is. 7. - P. 478-481, DOI 10.1134/S0021364019070075. - Cited References: 30. - This work was supported by the Russian Science Foundation (project no. 18-72-10036). The work was performed using the equipment of the Shared Usage Center of High-Capacity Computational Resources, Moscow State University, supported by the Ministry of Education and Science of the Russian Federation (project no. RFMEFI62117X0011). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
NEMATIC DROPLETS
   SURFACE
Аннотация: Orientational structures formed in cholesteric droplets with homeotropic surface anchoring have been studied by means of polarization optical microscopy and computer simulations. It has been found that, when the ratio of the size of droplets to the pitch of a cholesteric helix ranges from 1.4 to 2.9, an axisymmetric toroidal cholesteric structure is formed with a topological linear defect in the form of an equatorially located surface ring. The features of the toroidal structure in cholesteric droplets and their optical textures for various observation schemes are examined in detail.

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Публикация на русском языке Тороидальная конфигурация холестерика в каплях с гомеотропным сцеплением [Текст] / М. Н. Крахалев [и др.] // Письма в ЖЭТФ. - 2019. - Т. 109 Вып. 7-8. - С. 487-491

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, V. Yu.; Gardymova, A. P.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Science Foundation [18-72-10036]; Ministry of Education and Science of the Russian Federation [RFMEFI62117X0011]
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Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring / V. Yu. Rudyak [et al.] // 15th Eur. Conf. Liq. Cryst. (ECLC) : conf. progr. - 2019. - Ст. PB-31. - Cited References: 4

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Доп.точки доступа:
Rudyak, V. Yu.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Emelyanenko, A. V.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; European Conference on Liquid Crystals(15 ; 2019 ; June 30 - July 5 ; Wroclaw, Poland)
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Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring / M. N. Krakhalev [et al.] // Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст. 1-Е-6. - Cited References: 5

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Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, V. Yu.; Gardymova, A. P.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Emelyanenko, A. V.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; International Liquid Crystal Conference(27 ; 2018 ; July ; 22-27 ; Kyoto, Japan)
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Polymer-dispersed cholesteric liquid crystal under homeotropic anchoring: Electrically induced structures with λ1/2-disclination / A. P. Gardymova, M. N. Krakhalev, V. Yu. Rudyak [et al.] // Polymers. - 2022. - Vol. 14, Is. 7. - Ст. 1454, DOI 10.3390/polym14071454. - Cited References: 44. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038 . - ISSN 2073-4360
Кл.слова (ненормированные):
polymer-dispersed cholesteric liquid crystal -- orientational structure -- electric field-induced transformation -- topological defect -- metastable state
Аннотация: Orientational structures of polymer-dispersed cholesteric liquid crystal under homeotropic anchoring and their transformations under the action of an electric field are studied. The switching of cholesteric droplets between different topological states are experimentally and theoretically demonstrated. Structures with λ+1/2-disclination are found and considered. These structures are formed during the transformation of a twisted toroidal configuration induced by a decrease in the electric field when a relative chiral parameter N0>6.3. The transformation of the initial structure with a bipolar distribution of the helix axis into a twisted toroidal configuration and then into a structure with λ+1/2-disclination is investigated in detail. The behavior of these structures under the influence of an external electric field, as well as the appearance of structures with λ−1/2-disclination, are studied. Obtained results are promising for the development of optical materials with programmable properties.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russian Federation
Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, 119991, Russian Federation

Доп.точки доступа:
Gardymova, A. P.; Гардымова, Анна Петровна; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, V. Yu.; Рудяк, В. Ю.; Barbashov, V. A.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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Photo-orientation of nematic liquid crystal without preliminary cell surface treatment / S. A. Shvetsov [et al.] // Opt. Mater. Express. - 2019. - Vol. 9, Is. 6. - P. 2595-2600, DOI 10.1364/OME.9.002595. - Cited References: 28. - Russian Science Foundation (RSF) (18-72-00242). . - ISSN 2159-3930

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
HOMEOTROPIC ALIGNMENT
   INTERFACE
   DYE
   PHOTOALIGNMENT
   NONLINEARITY
Аннотация: We propose a simple and effective method of liquid crystal photoalignment that does not require any preliminary treatment of the cell substrates. To this aim, a small amount (0.1 wt %) of azobenzene carboxylic acid is added into the nematic liquid crystal. After filling the liquid crystal cell, a part of the dopant molecules is spontaneously adsorbed and attached to the glass surface by hydrogen bonds. This allows one to switch the boundary conditions of liquid crystal between homeotropic and planar due to the reversible trans-cis photoizomerization. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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Держатели документа:
Lomonosov Moscow State Univ, Moscow 119991, Russia.
Lebedev Phys Inst, Moscow 119991, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Siberian Branch, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Shvetsov, S. A.; Emelyanenko, Alexander, V; Bugakov, M. A.; Boiko, N. I.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Science Foundation (RSF) [18-72-00242]
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Photo-manipulated photonic bandgap devices based on optically tristable chiral-tilted homeotropic nematic liquid crystal / K. -C. Huang [et al.] // Opt. Express. - 2016. - Vol. 24, Is. 22. - P. 25019-25025, DOI 10.1364/OE.24.025019. - Cited References: 22. - Ministry of Science and Technology (MOST), (103-2923-M-009-003-MY3); Ministry of Education and Science of the Russian Federation (3.1276.2014/K); Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P (0358-2015-0010, 0358-2015-0011). . - ISSN 1094-4087
Кл.слова (ненормированные):
Defects -- Energy gap -- Liquid crystals -- Nematic liquid crystals -- Photonic crystals -- Spontaneous emission -- Homeotropic nematic liquid crystals -- Intensity modulators -- Low-power consumption -- Multi-channel filter -- One dimensional photonic crystal -- Photonic application -- Photonic bandgap devices -- Transmission characteristics -- Light transmission
Аннотация: We report on the spectral properties of an optically switchable tristable chiral-tilted homeotropic nematic liquid crystal (LC) incorporated as a tunable defect layer in one-dimensional photonic crystal. By varying the polarization angle of the incident light and modulating the light intensity ratio between UV and green light, various transmission characteristics of the composite were obtained. The hybrid structure realizes photo-tunability in transmission of defect-mode peaks within the photonic bandgap in addition to optical switchability among three distinct sets of defect modes via photoinduced tristable state transitions. Because the fabrication process is easier and less critical in terms of cell parameters or sample preparation conditions and the LC layer itself possesses an extra stable state compared with the previously reported bistable counterpart operating on the basis of biased-voltage dual-frequency switching, it has much superior potential for photonic applications such as a low-power-consumption multichannel filter and an optically controllable intensity modulator. © 2016 Optical Society of America.

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Держатели документа:
College of Photonics, National Chiao Tung University, Guiren Dist., Tainan, Taiwan
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Huang, K.-C.; Hsiao, Yu-Cheng; Yu-Cheng Hsiao; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, W.
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10.

    Orientational structures in cholesteric droplets with homeotropic surface anchoring / M. N. Krakhalev [et al.] // Soft Matter. - 2019. - Vol. 15, Is. 28. - P. 5554-5561, DOI 10.1039/c9sm00384c. - Cited References: 67. - This work was supported by the Russian Foundation for Basic Research Project No. 19-53-52011 MNT_a. The research is carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University supported by the project RFMEFI62117X0011. . - ISSN 1744-683X. - ISSN 1744-6848
Рубрики:
LIQUID-CRYSTAL DROPLETS
   TOPOLOGICAL DEFECTS
   NEMATIC DROPLETS
Аннотация: The dependency of orientational structures in cholesteric droplets with homeotropic surface anchoring on the helicity parameter has been studied by experiment and simulations. We have observed a sequence of structures, in which the director configurations and topological defects were identified by comparison of polarized microscopy pictures with simulated textures. A toron-like and low-symmetry intermediate layer-like structures have been revealed and studied in detail. The ranges of stability of the observed structures have been summarized in a general diagram and explained by the helicity parameter dependence of the free energy terms.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Lomonosov Moscow State Univ, Fac Phys, Moscow 119991, Russia.
Natl Cheng Kung Univ, Tainan 70101, Taiwan.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, Vladimir Yu.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Gardymova, Anna P.; Emelyanenko, Alexander V.; Liu, Jui-Hsiang; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Foundation for Basic Research Project [19-53-52011 MNT_a, RFMEFI62117X0011]
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