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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Gardymova A. P., Rudyak, Vladimir Yu., Barbashov, Vadim A., Zyryanov V. Ya.
Заглавие : Electrically induced transformation of cholesteric droplets under homeotropic boundary conditions
Колич.характеристики :7 с
Место публикации : J. Mol. Liq. - 2023. - Vol. 385. - Ст.122379. - ISSN 01677322 (ISSN), DOI 10.1016/j.molliq.2023.122379. - ISSN 18733166 (eISSN)
Примечания : Cited References: 37. - 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: Cholesteric droplets under homeotropic boundary conditions demonstrate a rich variety of possible orientational structures. We have implemented electrically controlled switching of such droplets between two classes of stable states: i) structures with cylindrical cholesteric layers and ii) layer-like structures with one or more λ+1/2-disclinations. Structure relaxation after switching off the voltage proceeded via the fast (less than 1 s), the slow (more than 1 s), and the stabilization stages (~10 hours). We investigated intermediate long-lived metastable states occurring in the relaxation process and explained the formation of various structures in cholesteric droplets. The fast and the slow stages of relaxation were found to be sensitive to the voltage reduction regime. We have determined the combinations of droplet size and voltage reduction regimes leading to the two types of structures after relaxation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kagan M. Yu., Aksenov S. V., Turlapov A. V., Ikhsanov R. Sh., Kugel K. I., Mazur E. A., Kuznetsov E. A., Silkin V. M., Burovski E. A.
Заглавие : Formation of droplets of the order parameter and superconductivity in inhomogeneous Fermi–Bose mixtures (Brief review)
Место публикации : JETP Lett. - 2023. - Vol. 117, Is. 10. - P.755-764. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364023600994. - ISSN 10906487 (eISSN)
Примечания : Cited References: 62. - This work was supported by the Russian Foundation for Basic Research (project no. 20-02-00015). M.Yu. Kagan acknowledges the support of the National Research University Higher School of Economics (Program of Basic Research)
Аннотация: The studies of a number of systems treated in terms of an inhomogeneous (spatially separated) Fermi–Bose mixture with superconducting clusters or droplets of the order parameter in a host medium with unpaired normal states are reviewed. A spatially separated Fermi–Bose mixture is relevant to superconducting Ba-KBiO3 bismuth oxides. Droplets of the order parameter can occur in thin films of a dirty metal, described in the framework of the strongly attractive two-dimensional Hubbard model at a low electron density with a clearly pronounced diagonal disorder. The Bose–Einstein condensate droplets are formed in mixtures and dipole gases with an imbalance in the densities of the Fermi and Bose components. The Bose–Einstein condensate clusters also arise at the center or at the periphery of a magnetic trap involving spin-polarized Fermi gases. Exciton and plasmon collapsing droplets can emerge in the presence of the exciton–exciton or plasmon–plasmon interaction. The plasmon contribution to the charge screening in MgB2 leads to the formation of spatially modulated inhomogeneous structures. In metallic hydrogen and metal hydrides, droplets can be formed in shock-wave experiments at the boundary of the first-order phase transition between the metallic and molecular phases. In a spatially separated Fermi–Bose mixture arising in an Aharonov–Bohm interference ring with a superconducting bridge in a topologically nontrivial state, additional Fano resonances may appear and collapse due to the presence of edge Majorana modes in the system.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Фейзер, Кристина Андреевна, Крахалев, Михаил Николаевич, Зырянов, Виктор Яковлевич
Заглавие : Электроиндуцированный оптический и структурный отклик капель холестерика и нематика с коническими граничными условиями
Место публикации : Жидк. крист. и их практич. использ. - 2022. - Т. 22, № 4. - С. 55-62. - ISSN 19913966 (ISSN), DOI 10.18083/LCAppl.2022.4.55; Liq. Cryst. Appl. - ISSN 24999644 (eISSN)
Примечания : Библиогр.: 17
Аннотация: Исследован электрооптический отклик пленок капсулированных полимером жидких кристаллов, в которых полимер задает конические граничные условия для холестерика и нематика. Показано, что для пленки на основе холестерика с относительным хиральным параметром капель, равным 0,32, управляющие напряжения меньше управляющих напряжений для пленок на основе нематика. Пороговые напряжения составляют 2,7 В и 4,9 В, а напряжения насыщения 7,3 В и 9,0 В для пленок на основе холестерика и нематика, соответственно. При напряжении насыщения светопропускание этих пленок составляет более 80 %. Пленка на основе холестерика переходит в состояние сильного рассеяния света в течение 85 мс после отключения напряжения, а пленка на основе нематика переходит в состояние начального рассеяния в течение нескольких дней. Существенные различия в электрооптическом отклике пленок на основе холестерика и нематика были объяснены с помощью исследования электроиндуцированных трансформаций ориентационных структур, формирующихся в каплях нематика и холестерика. Капсулированные полимером холестерические жидкие кристаллы с коническими граничными условиями перспективны для разработки устройств с низковольтным управлением.The electro-optical response of polymer dispersed liquid crystals films has been studied. The polymer specifies the conical boundary conditions for the cholesteric and nematic LC. It is shown that for the cholesteric-based film with the relative chiral parameters of droplets equal to 0.32, control voltages are less than control voltages for the nematic-based film. The threshold voltages are 2.7 V and 4.9 V, and the saturation voltages are 7.3 V and 9.0 V for the cholesteric-based and nematic-based films, respectively. At saturation voltage, the light transmission of these films is over 80 %. The cholesteric-based film turns into a strong scattering state during 85 ms after switching off voltage, while the nematic-based film turns into initial scattering state during a few days. Significant differences in the electro-optical response of the studied films were explained using an examination of electrically induced transformations of the orientational structures formed in nematic and cholesteric droplets. Polymer dispersed cholesteric liquid crystals with conical boundary conditions are prospectful for the development of devices with low-voltage control.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Small-angle scattering and radiation polarization by a stretched polymer film with nematic liquid crystal droplets having a single-domain structure
Коллективы : Belarusian Republican Foundation for Fundamental Research [F18RA-003]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk krai; Krasnoyarsk Krai Foundation of Science [18-42-243006]
Место публикации : Opt. Spectrosc. - 2020. - Vol. 128, Is. 3. - P.331-338. - ISSN 0030-400X, DOI 10.1134/S0030400X20030121. - ISSN 1562-6911(eISSN)
Примечания : Cited References: 24. - This work was carried out within the framework of the agreement on interacademic collaboration between the National Academy of Sciences of Belarus and Siberian Branch of the Russian Academy of Sciences. It was supported by the Belarusian Republican Foundation for Fundamental Research (project no. F18RA-003). M.N. Krakhalev acknowledges the support of the Russian Foundation for Basic Research, the Government of Krasnoyarsk krai, and Krasnoyarsk Krai Foundation of Science (grant no. 18-42-243006).
Предметные рубрики: IONIC MODIFICATION
LIGHT
Аннотация: The coefficient of directed transmittance of a stretched polymer-dispersed liquid crystal film with a defect-free single-domain liquid crystal droplet structure formed by a stretched surfactant-doped film and the polarization degree of forward-transmitted light in the visible and near-infrared spectrum ranges are studied. Results are presented for the 5CB, E7, and E44 nematic liquid crystals. Dependences of the transmission coefficient and polarizing ability of the film on the photodetector field of view are studied. Relationships allowing one to determine film parameters at which the transmission coefficient and polarizing ability of the films simultaneously reach values close to limit ones (0.5 and ±1.0, respectively) are obtained in the Foldy–Twersky and anomalous diffraction approximations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gardymova, Anna P., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Optical textures and orientational structures in cholesteric droplets with conical boundary conditions
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-72-10036]
Место публикации : Molecules. - 2020. - Vol. 25, Is. 7. - Ст.1740. - ISSN 1420-3049(eISSN), DOI 10.3390/molecules25071740
Примечания : Cited References: 53. - The authors are grateful for the financial support by the Russian Science Foundation (grant No. 18-72-10036).
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
CHIRAL NEMATIC DROPLETS
IONIC MODIFICATION
Аннотация: Cholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet’s equator is formed at the relative chirality parameter N0≤2.9 . The intermediate director configuration with the deformed circular defect is realised at 2.9N03.95 , and the layer-like structure with the twisted surface defect loop is observed at N0≥3.95 . The cholesteric layers in the layer-like structure are slightly distorted although the cholesteric helix is untwisted.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Prishchepa O. O., Shabanov A. V., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Polarization, transmission, and small-angle scattering of light by a polymer film with elongated droplets of nematic liquid crystal
Место публикации : J. Quant. Spectrosc. Radiat. Transf. - 2019. - Vol. 229. - P.130-144. - ISSN 00224073 (ISSN) , DOI 10.1016/j.jqsrt.2019.03.006
Примечания : Cited References: 29. - The work was performed in the framework of an agreement on inter-academic cooperation between the National Academy of Sciences of Belarus and the Siberian Branch of the Russian Academy of Sciences and supported by the Belarusian Republican Foundation for Fundamental Research (project no. F18RA-003 ). M.N. Krakhalev thanks the Russian Foundation for Basic Research and Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science, grant no. 18-42-243006.
Аннотация: An optical-mechanical model has been developed to describe the transmittance, polarization and small-angle distribution of light scattered by an uniaxially-stretched polymer film containing the elongated ellipsoidal droplets of nematic liquid crystal. It is based on the approximations of Foldy-Twersky, anomalous diffraction, and single scattering. The spectral dependences of transmittances and polarizing abilities of the polymer dispersed liquid crystal films have been analyzed as well as the small-angle intensity distribution and the polarization degree of scattered light depending on the film thicknesses, refractive index of polymer matrix, sizes of droplets, their anisometry parameters, concentration, polydispersity, and optical axes orientation. The optical characteristics of films with homogeneous and inhomogeneous interfacial anchoring at the surface of liquid crystal droplets have been considered. The transmittance and polarizing ability of the films have been studied as functions of the angular aperture of the system recording scattered light. © 2019 Elsevier Ltd
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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 : Polymer dispersed nematic liquid crystal films with conical boundary conditions for electrically controllable polarizers
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-243006]; Russian Foundation for Basic Research [16-32-60036]
Место публикации : Opt. Mater. - 2019. - Vol. 89. - P.1-4. - ISSN 0925-3467, DOI 10.1016/j.optmat.2019.01.004. - ISSN 1873-1252(eISSN)
Примечания : Cited References: 38. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (No 18-42-243006); Russian Foundation for Basic Research (No 16-32-60036).
Предметные рубрики: UNIAXIALLY ORIENTED FILMS
ANGLE LIGHT-SCATTERING
SWITCHABLE
Ключевые слова (''Своб.индексиров.''): polymer dispersed liquid crystal films--light polarizer--nematic--droplets--scattering anisotropy--electro-optics
Аннотация: Polymer dispersed nematic liquid crystal (PDNLC) films with conical boundary conditions at the LC-polymer interface are considered. The conical surface anchoring with tilt angle 40° initiates forming the axial-bipolar director configuration inside nematic droplets. This droplet structure exhibits the strong scattering of light polarized parallel to the bipolar axis. In the initial state, the bipolar axes in all droplets are oriented randomly, and therefore PDNLC film scatters a light of any polarization. Electric field applied along the film plane orients the bipolar axes unidirectionally in the whole droplet ensemble, that results in its high polarization-dependent transmittance. Such PDNLC films can be used in the electrically controllable linear polarizers characterized by 89% value of the transmittance for the perpendicular polarized light and high extinction ratio 590:1 at the electric field 0.34 V/μm.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Konkolovich A. V., Miskevich A. A., Krakhalev M. N., Prishchepa O. O., Shabanov A. V., Zyryanov V. Ya., Loiko V. A.
Заглавие : Model to describe light scattering by polymer film containing droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface: asymmetry effect in the angular distribution of light
Коллективы : Belarusian Republican Foundation for Fundamental Research [F18RA-003]; Krasnoyarsk Regional Science Foundation [18-42-243006]
Место публикации : Liq. Cryst. - 2019. - Vol. 46, Is. 9. - P.1415-1427. - ISSN 0267-8292, DOI 10.1080/02678292.2019.1573331. - ISSN 1366-5855(eISSN)
Примечания : Cited References: 67. - The work was performed in the framework of an agreement on inter-academic cooperation between the National Academy of Sciences of Belarus and the SB RAS. It is supported by the Belarusian Republican Foundation for Fundamental Research (Project No. F18RA-003). MN Krakhalev thanks the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Science Foundation (grant No. 18-42-243006).
Предметные рубрики: IONIC MODIFICATION
NEMATIC DROPLETS
COHERENT TRANSMITTANCE
Аннотация: A model to describe light scattering by polymer film containing of monolayer of liquid crystal droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface is developed. It is based on the interference approximation of the wave scattering theory. The director field distribution in the droplet volume is determined by solving the free energy density minimization problem using the relaxation method. The spatial distribution of droplets in the layer is described by the hard disks model. The amplitude scattering matrices of individual droplets are found in the anomalous diffraction approximation. The algorithm for numerical analysis of the characteristics of light scattered in a polymer film containing droplets at homogeneous and inhomogeneous surface anchoring is described in terms of the partial filling factors of the monolayer film. Electrically controllable symmetry breaking effect of angular distribution of light scattered by films containing droplets with inhomogeneous anchoring at the polymer-droplet interface is described and experimentally confirmed.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gardymova A. P., Sutormin V. S., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Orientational structures of cholesteric droplets with conical boundary conditions
Коллективы : Asian Conference on Liquid Crystals
Место публикации : The 4th Asian Conference on Liquid Crystals (ACLC 2019): abstracts. - 2019. - Ст.P-37. - P.113
Примечания : Библиогр.: 5
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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak, V. Yu., Gardymova A. P., Zyryanov V. Ya.
Заглавие : Toroidal Configuration of a Cholesteric Liquid Crystal in Droplets with Homeotropic Anchoring
Коллективы : Russian Science Foundation [18-72-10036]; Ministry of Education and Science of the Russian Federation [RFMEFI62117X0011]
Место публикации : JETP Letters. - 2019. - Vol. 109, Is. 7. - P.478-481. - ISSN 0021-3640, DOI 10.1134/S0021364019070075. - ISSN 1090-6487(eISSN)
Примечания : 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).
Предметные 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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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudyak V. Yu., Krakhalev M. N., Gardymova A. P., Prishchepa O. O., Emelyanenko A. V., Zyryanov V. Ya.
Заглавие : Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring
Коллективы : European Conference on Liquid Crystals
Место публикации : 15th Eur. Conf. Liq. Cryst. (ECLC): conf. progr. - 2019. - Ст.PB-31
Примечания : Cited References: 4
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M.
Заглавие : Structural stability of nematic liquid crystal droplets in the light of the catastrophe theory
Место публикации : Mod. Phys. Lett. B. - 2019. - Vol. 33, Is. 34. - Ст.1950434. - ISSN 0217-9849, DOI 10.1142/S0217984919504347. - ISSN 1793-6640 (eISSN)
Примечания : Cited References: 25. - The work was supported in part by the Siberian Branch of the Russian Academy of Sciences, integration Project No. 356-2018-0058.
Аннотация: Dynamical systems and defects in liquid crystals (LCs) are described using topological methods. Meanwhile, the director field distribution in LC droplets is affected by many bulk and surface factors that are difficult to take into account in the topological analysis. Therefore, the structural instability of a LC droplet formed in a magnetic field has been investigated by us in the framework of the catastrophe theory. The effect of temperature on the control parameters of the cusp catastrophe, which leads to the transition from a bipolar structure with extended poles to the homogeneous or radial configuration, has been estimated. It has been established from the potential curves that the transition is induced by the variation in the LC director orientation between the potential minima related to the LC polymer anchoring energy and magnetic field. The interplay of the cusp catastrophe control parameters and anchoring parameters has been elucidated.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudyak V. Yu., Krakhalev M. N., Sutormin V. S., Prischepa O. O., Zyryanov V. Ya., Emelyanenko A. V.
Заглавие : Orientation structures of nematic liquid crystal in ellipsoidal droplets
Коллективы : European Conference on Liquid Crystals
Место публикации : 15th Eur. Conf. Liq. Cryst. (ECLC): conf. progr. - 2019. - Ст.PB-17
Примечания : Cited References: 4
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak, Vladimir Yu., Prishchepa O. O., Gardymova, Anna P., Emelyanenko, Alexander V., Liu, Jui-Hsiang, Zyryanov V. Ya.
Заглавие : Orientational structures in cholesteric droplets with homeotropic surface anchoring
Коллективы : Russian Foundation for Basic Research Project [19-53-52011 MNT_a, RFMEFI62117X0011]
Место публикации : Soft Matter. - 2019. - Vol. 15, Is. 28. - P.5554-5561. - ISSN 1744-683X, DOI 10.1039/c9sm00384c. - ISSN 1744-6848(eISSN)
Примечания : 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.
Предметные 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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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Prishchepa O. O., Shabanov A. V., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Polymer films with elongated droplets of nematic liquid crystal: light transmission, scattering, and polarization
Коллективы : European Conference on Liquid Crystals
Место публикации : 15th Eur. Conf. Liq. Cryst. (ECLC): conf. progr. - 2019. - Ст.H2-O-31
Примечания : Cited References: 3
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudyak V. Yu., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya., Emelyanenko A. V.
Заглавие : Orientation structures of nematic liquid crystal in ellipsoidal droplets
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.P4-C2-3
Примечания : Cited References: 4
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak V. Yu., Gardymova A. P., Prishchepa O. O., Emelyanenko A. V., Zyryanov V. Ya.
Заглавие : Structures, topological defects and optical patterns of cholesteric droplets with homeotropic anchoring
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.1-Е-6
Примечания : Cited References: 5
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович, Сутормин, Виталий Сергеевич, Зырянов, Виктор Яковлевич, Шабанов, Василий Филиппович
Заглавие : Влияние ионного сурфактанта на энергию сцепления жидкого кристалла с поверхностью, исследованное с использованием магнитных пороговых полей перехода Фредерикса
Место публикации : Жидк. кристаллы и их практич. использ. - 2018. - Т. 18, № 3. - С. 59-66. - ISSN 1991-3966, DOI 10.18083/LCAppl.2018.3.59; Liq. Cryst. Appl. - ISSN 2499-9644
Примечания : Библиогр.: 25. - В. С. Сутормин благодарен РФФИ за поддержку исследований по гранту № 16-32-60036 мол_а_дк.
Предметные рубрики: WALL INTERFACE
TEMPERATURE-DEPENDENCE
NEMATIC DROPLETS
ADSORPTION
Ключевые слова (''Своб.индексиров.''): нематический жидкий кристалл--ионный сурфактант--энергия сцепления--магнитное поле--переход фредерикса--nematic liquid crystal--ionic surfactant--anchoring energy--magnetic field--freedericksz transition
Аннотация: Исследовано сцепление нематического жидкого кристалла 5ЦБ и 5ЦБ, допированного ионным сурфактантом ЦТАБ, в ячейках с плоскопараллельными ограничивающими поверхностями. Получены зависимости интенсивности проходящего лазерного излучения от величины магнитного поля для ячеек с различными толщинами слоя нематика при различных температурах. Из пороговых полей перехода Фредерикса определены значения полярной энергии сцепления жидкого кристалла с поверхностью. Изучено влияние ионного сурфактанта на энергию сцепления, установлено, что добавление в объем жидкого кристалла ионного сурфактанта ведет к ее ослаблению. Проведен анализ точности определения энергии сцепления на основе выражения, следующего из соотношения Рапини – Популара. Показано, что лучшее экспериментальное разрешение энергии сцепления достигается при использовании тонких слоев нематика, более сильных магнитных полей, а также слабого сцепления молекул жидкого кристалла с поверхностью.The coupling of nematic liquid crystal 5CB and 5CB doped with ionic surfactant CTAB in the cells with plane parallel interfaces was studied. For the cells with the varied nematic layer thickness at different temperatures, the dependencies of the passed laser radiation intensity on the magnetic field were obtained. From the threshold fields of Freedericksz transition, the polar anchoring energy of the liquid crystal to the surface was determined. The effect of the ionic surfactant on the anchoring energy was studied and it was found that the addition of the ionic surfactant to liquid crystal weakens the anchoring energy. The analysis of the accuracy of the anchoring energy determination based on the expression following from the Rapini - Popular relation was carried out. It was shown that the best experimental resolution of the anchoring energy is achieved when the thin nematic layers, stronger magnetic fields and weak anchoring of the liquid crystal molecules with the surface are used.
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