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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Sutormin V. S., Prishchepa O. O., Kuz'menok N. M., Mikhalyonok S. G., Bezborodov V. S., Zyryanov V. Ya.
Заглавие : Anionic-cationic surfactant mixture providing the electrically controlled homeotropic surface anchoring of liquid crystals
Коллективы : International conference on Hole Burning, Single Molecule, and Related Spectroscopies: Science and Applications - 2018 , 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]
Место публикации : J. Mol. Liq. - 2019. - Vol. 282: Suzdal Conference (2018, Suzdal, RUSSIA). - P.57-62. - ISSN 0167-7322, DOI 10.1016/j.molliq.2019.02.132. - ISSN 1873-3166(eISSN)
Примечания : 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).
Предметные рубрики: IONIC MODIFICATION
TRANSITION
DROPLETS
CONFIGURATION
LAYER
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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Gardymova A. P., Zyryanov V. Ya.
Заглавие : Bipolar configuration with a twisted defect loop in chiral nematic droplets
Коллективы : European Conference on Liquid Crystals, Московский государственный университет им. М.В. Ломоносова
Место публикации : 14th Eur. Conf. Liq. Cryst. (ECLC): conf. programme/ чл. нац. орг. и прогр. ком. V. Ya. Zyryanov. - 2017. - Ст.P133. - Poster
Примечания : Библиогр.: 3
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Gardymova A. P., Prishchepa O. O., Rudyak V. Yu., Emelyanenko A. V., Liu J. -H., Zyryanov V. Ya.
Заглавие : Bipolar configuration with twisted loop defect in chiral nematic droplets under homeotropic surface anchoring
Место публикации : Sci. Rep. - 2017. - Vol. 7, Is. 1. - Ст.14582. - ISSN 20452322 (ISSN), DOI 10.1038/s41598-017-15049-6
Примечания : 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).
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F., Nazarov V. G.
Заглавие : Bipolar-homogeneous structural phase transition in nematic droplets formed in the polymer matrix in a magnetic field
Место публикации : Crystallogr. Rep. - New York: Maik Nauka/Interperiodica/Springer, 2009. - Vol. 54, Is. 7. - С. 1191-1196. - DEC. - ISSN 1063-7745, DOI 10.1134/S1063774509070098
Примечания : 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]
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
FRANK CONSTANTS
ALIGNMENT
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mendez-Bermudez J. A., Luna-Acosta G. A., Seba P., Pichugin K. N.
Заглавие : Chaotic waveguide-based resonators for microlasers
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2003. - Vol. 67, Is. 16. - Ст.161104. - ISSN 1098-0121, DOI 10.1103/PhysRevB.67.161104
Примечания : Cited References: 33
Предметные рубрики: QUANTUM-CLASSICAL CORRESPONDENCE
MORPHOLOGY-DEPENDENT RESONANCES
DIRECTIONAL EMISSION
OPTICAL CAVITIES
MICRODISK LASERS
WAVE CHAOS
DROPLETS
PRECESSION
BILLIARDS
STATES
Аннотация: We propose the construction of highly directional emission microlasers using two-dimensional high-index semiconductor waveguides as open resonators. The prototype waveguide is formed by two collinear leads connected to a cavity of certain shape. The proposed lasing mechanism requires that the shape of the cavity yield mixed chaotic ray dynamics so as to have the approplate (phase space) resonance islands. These islands allow, via Heisenberg's uncertainty principle, the appearance of quasibound states (QBSs) which, in turn, propitiate the lasing mechanism. The energy values of the QBSs are found through the solution of the Helmholtz equation. We use classical ray dynamics to predict the direction and intensity of the lasing produced by such open resonators for typical values of the index of refraction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prishchepa O. O., Shabanov A. V., Zyryanov V. Y.
Заглавие : Director configurations in nematic droplets with inhomogeneous boundary conditions
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2005. - Vol. 72, Is. 3. - Ст.31712. - ISSN 1539-3755, DOI 10.1103/PhysRevE.72.031712
Примечания : Cited References: 22
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
TRANSITION
Ключевые слова (''Своб.индексиров.''): lecithin contents--nematic droplets--polarizers--radial structures--approximation theory--boundary conditions--drop breakup--free energy--polarization--textures--nematic liquid crystals
Аннотация: The nematic droplets with director configurations intermediate between the bipolar and radial structures have been investigated experimentally and theoretically. The liquid crystal 4(')-n-pentyl-4-cyanobiphenyl (5CB) with a variable addition of the lecithin dispersed in polyvinylbutyral has been used. The characteristic textures of the droplets formed at various lecithin contents have been examined using polarizing microscope both in the crossed polarizers and without analyzer. The computer simulation has been performed for proper ordering of the director in spherical nematic droplets by minimizing the free energy in the one-constant approximation. The inhomogeneous boundary conditions with strong anchoring of the molecules at the interface have been used. The distribution of the anchoring angle at the droplet surface has been estimated based on analysis of observed patterns. The simulated textures of the droplets under crossed polarizers are shown to compare well with the experimental ones.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Sutormin V. S., Zyryanov V. Ya.
Заглавие : Director configurations in nematic droplets with tilted surface anchoring
Коллективы : 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]
Место публикации : Liq. Cryst.: Taylor & Francis, 2017. - Vol. 44, Is. 2. - P.355-363. - ISSN 0267-8292, DOI 10.1080/02678292.2016.1205225. - ISSN 1366-5855(eISSN)
Примечания : 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].
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
RIGIDLY FIXED POLES
ELECTRIC-FIELD
POLYMER
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Director transformations within nematic droplets dispersed in polyvinylpirrolydon induced by temperature and moisture
Коллективы : IInternational LC Conference
Место публикации : 22nd International LC Conference: Abstracts. - 2008. - Vol. 1. - P.378
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudyak V. Y., Krakhalev M. N., Gardymova A. P., Abdullaev A. S., Alekseev A. A., Zyryanov V. Ya.
Заглавие : Effect of elastic constants on electrically induced transition in twisted radial cholesteric droplets
Место публикации : Sci. Rep. - 2022. - Vol. 12, Is. 1. - Ст.9565. - ISSN 20452322 (ISSN), DOI 10.1038/s41598-022-13612-4
Примечания : Cited References: 42. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038. The research was carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University
Аннотация: In this work, we investigated the behavior of cholesteric droplets with homeotropic boundary conditions experimentally and by computer simulations. Small droplets forming twisted radial structures were studied. We obtained two different paths of structural transformations under electric field in such droplets. The choice between these paths has probabilistic nature. The ratio between the two transition types was found to be sensitive to the elastic constants of LC forming the droplet. We suggest the principal approach for in situ estimation of ratios between elastic constants in cholesteric LCs deposited in polymer-dispersed LC material and discuss its strong and weak sides.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Electrically induced anchoring transition in nematics with small or zero dielectric anisotropy
Коллективы : Russian Foundation for Basic Research [15-02-06924, 16-53-00073, 16-32-60036, 16-32-00164]; Siberian Branch of Russian Academy of Sciences [II.2P 0358-2015-0010]
Место публикации : Liq. Cryst.: Taylor & Francis, 2017. - Vol. 44, Is. 3. - P.577-581. - ISSN 0267-8292, DOI 10.1080/02678292.2016.1225840. - ISSN 1366-5855(eISSN)
Примечания : Cited References:23. - This work was supported by Russian Foundation for Basic Research under Grants [15-02-06924 and 16-53-00073] and by the Siberian Branch of Russian Academy of Sciences under Complex Program [II.2P 0358-2015-0010]. V.S.S. acknowledges financial support from Russian Foundation for Basic Research under Grants [16-32-60036 and 16-32-00164].
Предметные рубрики: LIQUID-CRYSTAL
IONIC MODIFICATION
ORIENTATION
ALIGNMENT
DROPLETS
Ключевые слова (''Своб.индексиров.''): nematic--ionic surfactant--anchoring transition--hybrid homeoplanar--structure--dielectric anisotropy--electrooptics
Аннотация: The orientational transitions induced by electrically controlled ionic modification of surface anchoring in liquid crystal cells based on the nematics with small or zero dielectric anisotropy Δε are considered. The type of director reorientation is shown to be independent of the sign of dielectric anisotropy and can be the same for the nematics with both negative and positive Δε. Besides, the orientational transition and corresponding switchable optical states do not depend on the Δε value and can be effectively realised even for the nematics with zero dielectric anisotropy.
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