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    Структура и оптические свойства самоорганизованных ансамблей нематических доменов на поверхности поликарбоната / А. М. Паршин, В. А. Гуняков, В. Я. Зырянов, В. Ф. Шабанов // Жидк. крист. и их практич. использ. - 2022. - Т. 22, № 1. - С. 84-88 ; Liq. Cryst. Appl. ; Zidk. Krist. Prakt. Ispol'z., DOI 10.18083/LCAppl.2022.1.84. - Библиогр.: 9 . - ISSN 1991-3966. - ISSN 2499-9644
   Перевод заглавия: Structure and optical properties of self-organized nematic domains ensembles on polycarbonate surface
Кл.слова (ненормированные):
нематик -- поликарбонат -- структура -- переориентация директора -- интерференция -- nematic -- polycarbonate -- structure -- director reorientation -- interference
Аннотация: Рассмотрено структурное упорядочение самоорганизованных ансамблей нематических доменов с радиально-планарной конфигурацией, формирующихся на поверхности поликарбоната. Под влиянием теплового, упругого, электрического или магнитного полей структура доменов трансформируется в радиально-гомеотропную. При переориентации директора в данных структурах наблюдаются интерференционные осцилляции проходящего света с большой глубиной модуляции в отсутствие поляризаторов, что позволяет оценивать их как перспективный материал для оптических модуляторов.
The structural ordering of self-organized ensembles of nematic domains (SEND) with a radial-planar configuration, which are formed on the polycarbonate surface, is considered. The domain structure is transformed into radialhomeotropic one under the influence of a thermal, elastic, electric or magnetic fields. Interference oscillations of transmitted light with a large modulation depth are observed in the absence of polarizers, when the director is reoriented in these structures, which makes it possible to evaluate them as a promising material for optical modulators.

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Держатели документа:
Институт физики им. Л. В. Киренского, Федеральный исследовательский центр КНЦ СО РАН, Красноярск, Россия
Сибирский Федеральный университет, Красноярск, Россия

Доп.точки доступа:
Паршин, Александр Михайлович; Parshin, A. M.; Гуняков, Владимир Алексеевич; Gunyakov, V. A.; Зырянов, Виктор Яковлевич; Zyryanov, V. Ya.; Шабанов, Василий Филиппович; Shabanov, V. F.

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    Bipolar-homogeneous structural phase transition in nematic droplets formed in the polymer matrix in a magnetic field / A. M. Parshin [et al.] // Crystallogr. Rep. - 2009. - Vol. 54, Is. 7. - P1191-1196, DOI 10.1134/S1063774509070098. - Cited Reference Count: 19. - Гранты: This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools ( grant no. NSh-3818.2008.3), the Russian Foundation for Basic Research ( project no. 08-03-01007), the Presidium of the Russian Academy of Sciences ( project no. 27.1), and the Siberian Branch of the Russian Academy of Sciences ( project nos. 110 and 144). - Финансирующая организация: President of the Russian Federation [NSh-3818.2008.3]; Russian Foundation for Basic Research [08-03-01007]; Russian Academy of Sciences [27.1, 110, 144] . - DEC. - ISSN 1063-7745
Рубрики:
DISPERSED LIQUID-CRYSTALS
   FRANK CONSTANTS
   ALIGNMENT
Кл.слова (ненормированные):
Bipolar configuration -- Bipolar structure -- Cyanobiphenyls -- Homogeneous structure -- Mutual transformations -- Nematic director -- Nematic droplets -- Order parameter -- Poly(vinyl butyral) -- Structural phase transition -- Temperature range -- Thermal fluctuations -- Crystal structure -- Drop formation -- Liquid crystals -- Magnetic fields -- Nematic liquid crystals -- Phase transitions
Аннотация: The phase transition from the bipolar structure to the homogeneous structure in droplets formed from the nematic liquid crystal 4-n-pentyl-4'-cyanobiphenyl in poly(vinyl butyral) in the presence of a magnetic field has been investigated. The phase transition is associated with the expansion of the regions with a tilted orientation of the director in the vicinity of defects (the disappearance of boojums) and with the alignment of the nematic director lines in the bulk of the droplet in the direction of the magnetic field. In the temperature range T = 24-34A degrees C, cyclic mutual transformations between the bipolar configuration of the nematic director and the homogeneous structure, which have a period of similar to 0.5-3.5 s and result from thermal fluctuations of the order parameter, are observed in droplets 3-15 A mu m in size after the forming field is switched off.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Parshin, A. M.; Паршин, Александр Михайлович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович; Nazarov, V. G.
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Inverse mode of ion-surfactant method of director reorientation inside nematic droplets / M. N. Krakhalev, O. O. Prishchepa, V. Y. Zyryanov // Mol. Cryst. Liquid Cryst. - 2009. - Vol. 512, Is. 1. - P. 1998-2003, DOI 10.1080/15421400903050814. - Cited Reference Count: 8. - Гранты: This work was partially supported by the grants Nos. NSh-3818.2008.3; 02.740.11.0220, and No. 08-03-01007 of RFBR, and Nos. 27.1; 110; 144 of SB RAS. M. Krakhalev acknowledges the financial support from K. I. Zamaraev MBN Foundation. O. Prishchepa acknowledges the financial support from Russian Science Support Foundation. - Финансирующая организация: RFBR [NSh-3818.2008.3, 02.740.11.0220, 08-03-01007]; SB RAS [27.1; 110; 144]; Zamaraev MBN Foundation; Russian Science Support Foundation . - ISSN 1542-1406
Кл.слова (ненормированные):
electrically commanded surfaces -- ion surfactant -- nematic -- polymer dispersed liquid crystals -- surface anchoring -- Electrically commanded surfaces -- Ion surfactant -- Nematic -- Polymer dispersed liquid crystals -- Surface anchoring -- Applied voltages -- Crossed polarizers -- Director fields -- Director reorientation -- Droplet structure -- Electrically commanded surfaces -- High concentration -- Homeotropic -- Initial state -- Ionic modification -- Liquid-crystal droplets -- Nematic droplets -- Nematic polymer -- Surface-active cations -- Surface-anchoring -- Trimethyl -- Ammonium compounds -- Cationic surfactants -- Crystals -- Drop formation -- Dyes -- Ionization of liquids -- Ions -- Liquid crystal displays -- Liquid crystals -- Liquids -- Nematic liquid crystals
Аннотация: Inverse mode of a novel electrooptical effect caused by the ionic modification of boundary conditions has been studied for liquid crystal droplets. We have considered the droplets of nematic 5CB doped with cationic surfactant cetyl-trimethyl-ammonium-bromide and dispersed in polyvinyl alcohol. In the initial state the surface anchoring was normal on the whole interface due to the high concentration of homeotropic surfactant. Applied voltage results in the purification of a section of the interface from the surface-active cations thereby restoring here a tangential anchoring and stimulating the significant transformation of droplet structure. At that three different types of director field distribution can be realized within the same droplet. The proper textures of the droplet both in the crossed polarizers and without analyzer are considered.

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia
Siberian Fed Univ, Krasnoyarsk, Russia

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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    Magnetic-field tunable defect modes in a photonic-crystal/liquid-crystal cell / V. Ya. Zyryanov [et al.] // Opt. Express. - 2010. - Vol. 18, Is. 2. - P. 1283-1288, DOI 10.1364/OE.18.001283. - Cited Reference Count: 15. - Гранты: This work was partially supported by the Russian Federal Grant No. 02.740.11.0220 and SB RAS Grant Nos. 5, 27.1 and 144. W. Lee gratefully acknowledges financial support from the National Science Council of the Republic of China (Taiwan) under Grant No. NSC 98-2923-M-033-001-MY3 dedicated to an internationally joint effort between Russia and Taiwan. - Финансирующая организация: Russian Federal [02.740.11.0220]; SB RAS [5, 27.1, 144]; National Science Council of the Republic of China (Taiwan) [NSC 98-2923-M-033-001-MY3] . - JAN 18. - ISSN 1094-4087
Рубрики:
NEMATIC LIQUID-CRYSTAL
   BAND-GAP MATERIALS
   SPONTANEOUS EMISSION
   SPECTRUM
Кл.слова (ненормированные):
Crystal defects -- Magnetic fields -- Photonic crystals -- Applied magnetic fields -- Crossed polarizers -- Crystal cells -- Defect mode -- Homeotropic -- Light transmission spectra -- Light wave -- Nematic director -- Optical cells -- Planar alignment -- Spectral shift -- Tunable defect -- Light transmission -- article -- artifact -- chemistry -- electromagnetic field -- liquid crystal -- materials -- materials testing -- radiation exposure -- refractometry -- Artifacts -- Electromagnetic Fields -- Liquid Crystals -- Manufactured Materials -- Materials Testing -- Refractometry
Аннотация: Light transmission spectrum of a multilayer photonic crystal with a central liquid-crystal defect layer placed between crossed polarizers has been studied. Transmittance was varied due to the magnetically induced reorientation of the nematic director from homeotropic to planar alignment. Two notable effects were observed for this scheme: the spectral shift of defect modes corresponding to the extraordinary light wave and its superposition with the ordinary one. As a result, the optical cell allows controlling the intensity of interfering defect modes by applied magnetic field. (C) 2010 Optical Society of America

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660014, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Chung Yuan Christian Univ, Dept Phys, Chungli 32023, Taiwan
Chung Yuan Christian Univ, Ctr Nanotechnol, Chungli 32023, Taiwan

Доп.точки доступа:
Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Parshin, A. M.; Паршин, Александр Михайлович; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Shabanov, V. F.; Шабанов, Василий Филиппович; Lee, Wei
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Director configurations in cholesteric layer with tangential-conical boundary conditions / M. N. Krakhalev [et al.] // 15th Eur. Conf. Liq. Cryst. (ECLC) : conf. progr. - 2019. - Ст. PC-06. - Cited References: 2

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Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; European Conference on Liquid Crystals(15 ; 2019 ; June 30 - July 5 ; Wroclaw, Poland)
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Polymer dispersed cholesteric liquid crystals with a toroidal director configuration under an electric field / A. P. Gardymova, M. N. Krakhalev, V. Ya. Zyryanov [et al.] // Polymers. - 2021. - Vol. 13, Is. 5. - Ст. 732. - P. 1-11, DOI 10.3390/polym13050732. - Cited References: 49. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038 . - ISSN 2073-4360
Кл.слова (ненормированные):
cholesteric droplet -- orientational structure -- electric field -- polymer dispersted liquid crystal -- dichroic dye
Аннотация: The electro-optical properties of polymer dispersed liquid crystal (PDLC) films are highly dependent on the features of the contained liquid crystal (LC) droplets. Cholesteric LC droplets with homeotropic boundaries can form several topologically different orientational structures, including ones with single and more point defects, layer-like, and axisymmetric twisted toroidal structures. These structures are very sensitive to an applied electric field. In this work, we have demonstrated experimentally and by computer simulations that twisted toroidal droplets reveal strong structural response to the electric field. In turn, this leads to vivid changes in the optical texture in crossed polarizers. The response of droplets of different sizes were found to be equivalent in terms of dimensionless parameters. In addition, the explanation of this phenomenon showed a comparison of theoretical and experimental structural response curves aids to determine the shape of the droplet. Finally, we demonstrated that the addition of a dichroic dye allows such films to be used as optical filters with adjustable color even without polarizers.

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

Доп.точки доступа:
Gardymova, A. P.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Gruzdenko, A. A.; Alekseev, A. A.; Rudyak, V. Yu.
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    Nematic structures under conical anchoring at various director tilt angles specified by polymethacrylate compositions / D. A. Kostikov, M. N. Krakhalev, O. O. Prishchepa, V. Y. Zyryanov // Polymers. - 2021. - Vol. 13, Is. 17. - Ст. 2993, DOI 10.3390/polym13172993. - Cited References: 49. - Mikhail N. Krakhalev and Oxana O. Prishchepa acknowledge financial support from Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (No 20-42-240007) . - ISSN 2073-4360
   Перевод заглавия: Нематические структуры с коническим сцеплением при различных углах наклона директора, задаваемых составами полиметакрилатов

РУБ Polymer Science
Рубрики:
LIQUID-CRYSTAL
   PRETILT ANGLE
   ALIGNMENT LAYERS
   SURFACE
   INTERFACE
Кл.слова (ненормированные):
conical anchoring -- polymethacrylate -- nematic liquid crystal -- orientational structure -- director tilt angle -- domain wall -- electrically-induced reorientation
Аннотация: Dependence of the director tilt angle of nematic liquid crystal (LC) under conical anchoring from the two-component polymer mixture composition has been studied. We varied the ratio of poly(isobutyl methacrylate) (PiBMA), which specifies a conical anchoring for the nematic liquid crystal LN-396, and poly(methylmethacrylate) (PMMA) assigning a tangential alignment for the same nematic. An oblique incidence light technique to determine a tilt angle has been used. It has been shown that the tilt angle increases from 0∘ to 47.7∘ when PiBMA:PMMA ratio changes in the range 30:70 to 100:0. The specific optical textures viewed under the polarizing microscope and proper orientational structures have been considered for various compositions of the polymer films. An electric field action on the formed orientational structures has been investigated. The obtained results are promising for the application in various electro-optical LC devices with a conical anchoring in which the director tilt angle is a crucial parameter: a controlled diffraction gratings, an electrically operated achromatic rotators of linear light polarization, etc.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Kostikov, D. A.; Костиков, Денис Андреевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [20-42-240007]
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Bistable director configurations in polymer dispersed nematic liquid crystals / Parshin A.M., Nazarov V.G., Zyryanov V.Ya., Shabanov V.F. // 22nd International LC Conference : Abstracts. - 2008. - Vol. 1. - P. 382

Доп.точки доступа:
Parshin, A. M.; Паршин, Александр Михайлович; Nazarov, V. G.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович; IInternational LC Conference(22 ; 2008 ; Jeju, Korea)
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Director transformations within nematic droplets dispersed in polyvinylpirrolydon induced by temperature and moisture / Sutormin V.S., Krakhalev M.N., Prishchepa O.O., Zyryanov V.Ya. // 22nd International LC Conference : Abstracts. - 2008. - Vol. 1. - P. 378

Доп.точки доступа:
Sutormin, V. S.; Сутормин, Виталий Сергеевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; IInternational LC Conference(22 ; 2008 ; Jeju, Korea)
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10.

    Electrically induced structural transformations of a chiral nematic under tangential-conical boundary conditions / D. A. Kostikov, M. N. Krakhalev, O. O. Prishchepa, V. Ya. Zyryanov // Molecules. - 2023. - Vol. 28, Is. 23. - Ст. 7842, DOI 10.3390/molecules28237842. - Cited References: 30 . - ISSN 1420-3049
   Перевод заглавия: Электрически индуцированные трансформации структур хирального нематика с тангенциально-коническими граничными условиями
Кл.слова (ненормированные):
chiral nematic -- cholesteric -- conical anchoring -- polymethacrylate -- director tilt angle -- electrically induced transformation -- orientational structure -- polarizing optical microscopy
Аннотация: In this study, structural transformations induced by an electric field in the chiral nematic under tangential-conical boundary conditions have been considered. The composition influence of the orienting polymer films on the director tilt angles, the formation of orientational structures in the LC layer, as well as the electro-optical response and relaxation processes have been studied. It has been shown that the poly(tert-butyl methacrylate) concentration change in the orienting polymer mixture allows for smoothly controlling the director tilt angle without fixing its azimuthal orientation rigidly.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Kostikov, D. A.; Костиков, Денис Андреевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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