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1.

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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2.

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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3.

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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4.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Gardymova A. P., Shabanov A. V., Kuz’menok N., Bezborodov V., Zyryanov V. Ya.
Заглавие : Electrically controlled anchoring transitions induced by ionic surfactants in liquid crystals
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.2-B1-16
Примечания : Cited References: 3
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5.

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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6.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krakhalev M. N., Sutormin V. S., Prishchepa O. O., Gardymova A. P., Zyryanov V. Ya.
Заглавие : Ionic surfactants for the development of new method to control liquid crystals
Коллективы : International conference on colloid chemistry and physicochemical mechanics, Российская академия наук, Московский государственный университет им. М.В. Ломоносова
Место публикации : IV International conference on colloid chemistry and physicochemical mechanics. (CCPCM-13): book of abstracts. - 2013. - P.332-333
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7.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zyryanov V.Ya., Krakhalev M.N., Prishchepa O.O., Gardymova A.P., Sutormin V.S., Loiko V.A.
Заглавие : Light valves based on LC materials with ion-surfactant operation modes
Коллективы : "Advanced Display Technologies", International Symposium
Место публикации : 18th International Symposium "Advanced Display Technologies". - 2010. - С. 148
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Sutormin V. S., Krakhalev M. N., Gardymova A. P., Prishchepa O. O., Shabanov A. V.
Заглавие : Liquid crystal materials with ionic-surfactant operation
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2017. - Vol. 81, Is. 5. - P.594-597. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873817050288
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): crystalline materials--liquid crystals--surface active agents--b-y ions--ionic surfactants--liquid crystal materials--liquid crystalline materials--new approaches--surface-active compounds--surface-anchoring--liquids
Аннотация: A conceptually new approach for developing methods of control of liquid crystals is discussed. The approach is based on modifying surface anchoring. A brief review of the authors’ research on developing ionic-surfactant control of liquid crystalline materials is described. This approach is based on the effect of electrically induced modification of the boundary conditions by ions of surface-active compounds. © 2017, Allerton Press, Inc.
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9.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krakhalev M. N., Sutormin V. S., Prishchepa O. O., Gardymova A. P., Shabanov A. V., Wei Lee, Zyryanov V. Ya.
Заглавие : Liquid crystals doped with ionic surfactants for electrically induced anchoring transitions
Место публикации : Unconventional liquid crystals and their applications/ ed.: Wei Lee, S. Kumar. - Berlin et al.: De Gruyter, 2021. - Chap. 7. - P.279-330. - DOI 10.1515/9783110584370-007
Примечания : Cited References: P. 327-330
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gardymova A. P., Zyryanov V. Y., Loiko V. A.
Заглавие : Multistability in polymer-dispersed cholesteric liquid crystal film doped with ionic surfactant
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 37, Is. 9. - P805-808. - ISSN 1063-7850, DOI 10.1134/S1063785011090094
Примечания : Cited References: 12. - This study was supported in part by the Federal Targeted Program "Scientific and Pedagogical Personnel for Innovative Russia" (project no. P901) and the Siberian Branch of the Russian Academy of Sciences (project nos. 110 and 144).
Предметные рубрики: REFLECTIVE DISPLAYS
Аннотация: A memory effect has been discovered in composite films based on a polymer containing dispersed cholesteric liquid crystal, which is related to the modification of the surface anchoring by an ionic surfactant under the action of an applied electric field. Parameters of electric signals are selected that ensure the switching of the composite film between some stable states with different levels of optical transmittance.
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