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Active beam steering by cholesteric layer with tangential-conical boundary conditions / R. G. Bikbaev, M. N. Krakhalev, O. O. Prishchepa [et al.] // Abstracts of 28th International Liquid Crystal Conference (ILCC 2022). - 2022. - Ст. PF.292. - Cited References: 2

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Доп.точки доступа:
Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; International Liquid Crystal Conference(28 ; 2022 ; July ; 24-29 ; Lisbon, Portugal)
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    Anionic-cationic surfactant mixture providing the electrically controlled homeotropic surface anchoring of liquid crystals / M. N. Krakhalev [et al.] // J. Mol. Liq. - 2019. - Vol. 282: Suzdal Conference (2018, Suzdal, RUSSIA). - P. 57-62, DOI 10.1016/j.molliq.2019.02.132. - Cited References: 30. - The reported study was supported by the Belarusian Republican Foundation for Fundamental Research (project No X16P-110) and Russian Foundation for Basic Research (RFBR) (project No 16-53-00073). Mikhail N. Krakhalev and Vitaly S. Sutormin acknowledge financial support from RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (project No 18-42-243006). . - ISSN 0167-7322. - ISSN 1873-3166
   Перевод заглавия: Смесь анионного и катионного сурфактантов, обеспечивающая электроуправляемое гомеотропное поверхностное сцепление в жидких кристаллах

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
IONIC MODIFICATION
   TRANSITION
   DROPLETS
   CONFIGURATION
   LAYER
Кл.слова (ненормированные):
Polymer dispersed liquid crystal -- Nematic droplet -- Ionic surfactant -- Anchoring transition -- Director configuration -- Optical texture
Аннотация: In search of a substance able to function as an anionic surfactant applied for the electrically-induced anchoring transitions in liquid crystals, the compound 4-heptyloxybenzoate benzyl dodecyldimethylammonium (HOBBDDA) has been synthesized. Its orienting influence on nematic liquid crystal 4-pentyl-4'-cyanobiphenyl (5CB) has been tested. HOBBDDA dissolved up to 1.4%in 50 droplets dispersed in polymer film does not change the tangential surface anchoring inherent to polyvinyl alcohol matrix used. Homeotropic surface anchoring is realized if the HOBBDDA content exceeds 1.7%. The molecules of the surfactant in 5CB dissociate into anions and cations. The anions modify the surface anchoring under the action of DC electric field both in the normal and inverse mode. The mixture of HOBBDDA and cetyltrimethylammonium bromide can function as a binary ionic cationic surfactant which significantly expands the prospects for using the ionic-surfactant method to control liquid crystal materials. (C) 2019 Elsevier B.V. All rights reserved.

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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.
Belarusian State Technol Univ, Minsk 220006, BELARUS.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Kuz'menok, N. M.; Mikhalyonok, S. G.; Bezborodov, V. S.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Belarusian Republican Foundation for Fundamental Research [X16P-110]; Russian Foundation for Basic Research (RFBR) [16-53-00073]; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-243006]; International conference on Hole Burning, Single Molecule, and Related Spectroscopies: Science and Applications - 2018(XIII ; August 6-12, 2018 ; Suzdal - Moscow, Russia)
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Bipolar configuration with a twisted defect loop in chiral nematic droplets / M. N. Krakhalev [et al.] // 14th Eur. Conf. Liq. Cryst. (ECLC) : conf. programme / чл. нац. орг. и прогр. ком. V. Ya. Zyryanov. - 2017. - Ст. P133. - Библиогр.: 3 . - Poster

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Доп.точки доступа:
Zyryanov, V. Ya. \чл. нац. орг. и прогр. ком.\; Зырянов, Виктор Яковлевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Gardymova, A. P.; Zyryanov, V. Ya.; European Conference on Liquid Crystals(14 ; 2017 ; June ; 25-30 ; Moscow); Московский государственный университет им. М.В. Ломоносова
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    Bipolar configuration with twisted loop defect in chiral nematic droplets under homeotropic surface anchoring / M. N. Krakhalev [et al.] // Sci. Rep. - 2017. - Vol. 7, Is. 1. - Ст. 14582, DOI 10.1038/s41598-017-15049-6. - Cited References: 45. - We are grateful to Dr. Timofeev Ivan Vladimirovich for valuable comments and discussions. This work was supported by the Russian Foundation for Basic Research (RFBR) under Grants Nos 15-02-06924, 16-53-00073, and Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 16-42-240704, and by the Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P 0358-2015-0010. The work of V.Y.R. and À.V.Å. on the simulation of droplet structure and texture was supported by the Russian Science Foundation (project No. 16-43-03010). The work of J.H.L. was supported by the Ministry of Science and Technology of Taiwan (contract No. MOST105-2923-E-006-007). . - ISSN 2045-2322
   Перевод заглавия: Биполярная конфигурация с дефектом в виде закрученной петли в нематических каплях при гомеотропном поверхностном сцеплении
Аннотация: Optical textures and appropriate orientational structures have been studied within droplets of chiral nematic dispersed in polymer assigning the homeotropic anchoring. The helix axis of the chiral structure inside droplets forms the bipolar configuration. The optical droplet textures were analysed in the unpolarised light, analyser switching-off scheme and in crossed polarisers. The twisted loop defect reveals itself convincingly in all schemes. Its appearance at the optical patterns of the chiral nematic droplets has been examined depending on their size and the aspect direction. The existence of the defect has been verified by the structural and optical calculations. The effect of an electric field on both the defect line shape and the orientational structure of chiral nematic has been studied.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center - Krasnoyarsk Scientific Center, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Faculty of Physics, Lomonosov Moscow State University, Moscow, Russian Federation
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Gardymova, A. P.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Rudyak, V. Yu.; Emelyanenko, A. V.; Liu, J. -H.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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    Cholesteric layers with tangential-conical surface anchoring for an electrically controlled polarization rotator / V. S. Sutormin, M. N. Krakhalev, I. V. Timofeev [et al.] // Opt. Mater. Express. - 2021. - Vol. 11, Is. 5. - P. 1527-1536, DOI 10.1364/OME.425130. - Cited References: 25. - Russian Science Foundation (Grant No. 18-72-10036) . - ISSN 2159-3930
   Перевод заглавия: Холестерические слои с тангенциально-коническим поверхностным сцеплением для электро-управляемого вращателя поляризации
Кл.слова (ненормированные):
Azimuthal rotation -- Cholesteric helix -- Conical boundary condition -- Conical surfaces -- Control voltages -- Controlled polarization -- Polarization characteristics -- Voltage dependence
Аннотация: The voltage dependences of polarization characteristics of light passed through the cholesteric layers with tangential-conical boundary conditions have been investigated. It has been shown that such layers allow turning the polarization azimuth more than 70˚ because of the unique untwisting effect of the cholesteric helix, due to free azimuthal rotation of the director on the substrate with conical anchoring. Optical cells under study have some advantages (low control voltage, smooth variation of polarization azimuth, simplicity of design) and can be used as an electrically controlled polarization rotator of white light.

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Держатели документа:
Federal Research Center Ksc Sb Ras, Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Sutormin, V. S.; Сутормин, Виталий Сергеевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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Design of anisotropic materials based on quaternary ammonium salts «Gemini» type / N. Kuz’menok [et al.] // 14th Eur. Conf. Liq. Cryst. (ECLC) : conf. programme / чл. нац. орг. и прогр. ком. V. Ya. Zyryanov. - 2017. - Ст. 15493985. - Библиогр.: 3

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Доп.точки доступа:
Zyryanov, V. Ya. \чл. нац. орг. и прогр. ком.\; Зырянов, Виктор Яковлевич; Kuz’menok, N.; Mikhalyonok, S.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Bezborodov, V.; European Conference on Liquid Crystals(14 ; 2017 ; June ; 25-30 ; Moscow); Московский государственный университет им. М.В. Ломоносова
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Development of scattering media optics methods to calculate optical properties of polymer dispersed liquid crystal films / V. A. Loiko [et al.] // EuroDisplay 2017 : Abstract book. - 2017. - P. 27-28

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Доп.точки доступа:
Loiko, V. A.; Konkolovich, A. V.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Miskevich, A. A.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; EuroDisplay conference(2017 ; 31 Oct. - 2 Nov. ; Berlin, Germany); Society for Information Displays; Institute of Physics
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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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Director configurations in nematic droplets with tilted surface anchoring / M. N. Krakhalev [et al.] // Liq. Cryst. - 2017. - Vol. 44, Is. 2. - P. 355-363, DOI 10.1080/02678292.2016.1205225. - Cited References:32. - This work was supported by Russian Foundation for Basic Research (RFBR) under Grants 15-02-06924 and 16-32-00164 and Siberian Branch of the Russian Academy of Sciences (SB RAS) under Complex Program [II.2P 0358-2015-0010], and V.S.S. acknowledges financial support from RFBR [16-32-60036]. . - ISSN 0267-8292. - ISSN 1366-5855

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
DISPERSED LIQUID-CRYSTALS
   RIGIDLY FIXED POLES
   ELECTRIC-FIELD
   POLYMER
Кл.слова (ненормированные):
Polymer dispersed liquid crystal -- nematic droplet -- director -- configuration -- boundary conditions -- surface anchoring strength -- optical -- texture
Аннотация: The polymer dispersed nematic liquid crystal (LC) with the tilted surface anchoring has been studied. The droplet orientational structures with two point surface defects – boojums and the surface ring defect – are formed within the films. The director tilt angle α = 40° ± 4° at the droplet interface and LC surface anchoring strength Ws ~ 10–6 (J m−2) have been estimated. The bipolar axes within the studied droplets of oblate ellipsoidal form can be randomly oriented are oriented randomly relatively to the ellipsoid axes as opposed to the droplets with homeotropic and tangential anchoring.

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

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Foundation for Basic Research (RFBR) [15-02-06924, 16-32-00164]; Siberian Branch of the Russian Academy of Sciences (SB RAS) [II.2P 0358-2015-0010]; RFBR [16-32-60036]
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10.

Director reorientation induced by electrically controlled anchoring transition in cholesteric layer / V. S. Sutormin [et al.] // 14th Eur. Conf. Liq. Cryst. (ECLC) : conf. programme / чл. нац. орг. и прогр. ком. V. Ya. Zyryanov. - 2017. - Ст. O34. - P. 8. - Библиогр.: 4

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Доп.точки доступа:
Zyryanov, V. Ya. \чл. нац. орг. и прогр. ком.\; Зырянов, Виктор Яковлевич; 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.; European Conference on Liquid Crystals(14 ; 2017 ; June ; 25-30 ; Moscow); Московский государственный университет им. М.В. Ломоносова
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