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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 журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Sutormin V. S., Timofeev I. V., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Anomalous spectral shift of o-modes in multilayer photonic structure induced by homeotropic–homeoplanar transition in chiral–nematic defect layer
Колич.характеристики :11 с
Место публикации : Photonics. - 2023. - Vol. 10, Is. 9. - Ст.959. - ISSN 23046732 (eISSN), DOI 10.3390/photonics10090959
Примечания : Cited References: 39
Аннотация: A chiral nematic is embedded between multilayer mirrors to obtain voltage-inducible polarized resonance spectra. Initially, the nematic director is uniformly oriented perpendicular to the mirrors’ surfaces because the chiral nematic helix is completely untwisted due to the homeotropic boundary conditions specified by the adsorbed cations. Then, a voltage is applied to remove the layer of surface-active cations from the input mirror. The obtained twisted homeoplanar configuration has a helix pitch exceeding the layer’s thickness. The twisting leads to the anomalous blue shift of the o-modes in the transmittance spectrum of the photonic structure. This blue shift can be effectively compensated by repulsion of spectral peaks as a result of mode coupling in the vicinity of the virtual avoided crossing point. The experimental results obtained are confirmed numerically using the 4 ˣ 4 transfer matrix method and explained with the contribution of a geometric phase.
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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 cholesteric liquid crystal cells with different confinement ratios
Место публикации : Liq. Cryst. - 2018. - Vol. 45, Is. 8. - P.1129-1136. - ISSN 02678292 (ISSN), DOI 10.1080/02678292.2017.1416504
Примечания : Cited References: 29. - This work was supported by Russian Foundation for Basic Research (RFBR) [grant number 16-53-00073]. Vitaly S. Sutormin acknowledges financial support from RFBR [grant number 16-32-60036].
Ключевые слова (''Своб.индексиров.''): cholesteric--ionic surfactant--anchoring transition--modulated hybrid-aligned cholesteric layer--diffraction grating
Аннотация: Reorientation of cholesteric liquid crystal induced by the electrically controlled ionic modification of surface anchoring within the cell with confinement ratio exceeding 1 has been studied. The change of homeotropic surface anchoring to the planar one on the electrode-anode substrate under the action of DC voltage causes the formation of the modulated hybrid-aligned cholesteric layer in the cell. Optical texture of the liquid crystal layer with such an orientation structure is the linear periodic stripes. Homogeneity of emerging optical texture depending on the confinement ratio as well as on the prehistory of voltage application has been considered. It has been found that the ionic modification of surface anchoring results in total transformation of the diffraction pattern observed after the laser beam passing through the sample.
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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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zyryanov V.Ya., Sutormin V. S., Krakhalev M. N., Prishchepa O. O.
Заглавие : Electrically-controlled anchoring transitions in nematics doped with ionic surfactant
Коллективы : European Conference on Liquid Crystals
Место публикации : 12th Eur. Conf. Liq. Cryst. (ECLC-2013). - 2013. - Ст.O.29
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Misckevich A. A., Krakhalev M. N., Prishchepa O. O., Shabanov A. V., Zyryanov V. Ya.
Заглавие : Electro-optical response of a monolayer polymer dispersed nematic liquid crystal film doped with surfactant
Место публикации : Liquid crystal polymer nanocomposites/ ed.: P. M. Visakh [et al.]: Elsevier, 2022. - Chap. 7. - P.163-211. - (Woodhead publishing in materials). - ISBN 978-0-12-822128-0, DOI https://doi.org/10.1016/B978-0-12-822128-0.00006-6
Примечания : References: 86
Аннотация: Light scattering and transmission by a monolayer polymer dispersed liquid crystal film containing liquid crystal droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface is considered theoretically and experimentally. The developed optical model is based on the anomalous diffraction and interference approximations of the theory of scattering of waves. It is applied to describe the interference quenching effect for the coherently transmitted light and electrically controllable symmetry breaking effect in small-angle structure of light scattered by film containing droplets with inhomogeneous anchoring. The analysis of transmittance and reflectance of the one-dimensional photonic crystals composed of monolayers is carried out. The formation of the photonic band gaps is analyzed.
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Вид документа : Однотомное издание
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Krakhalev M. N., Prishchepa O. O., Shabanov A. V., Zyryanov V. Ya.
Заглавие : Electro-optical response of a monolayer polymer dispersed nematic liquid crystal film doped with surfactant
Место публикации : Liquid Crystal Polymer Nanocomposites: Woodhead Publishing, 2022. - Chapter 7. - P.163-211. - , DOI 10.1016/B978-0-12-822128-0.00006-6
Примечания : Cited References: 86
Аннотация: Light scattering and transmission by a monolayer polymer dispersed liquid crystal film containing liquid crystal droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface is considered theoretically and experimentally. The developed optical model is based on the anomalous diffraction and interference approximations of the theory of scattering of waves. It is applied to describe the interference quenching effect for the coherently transmitted light and electrically controllable symmetry breaking effect in small-angle structure of light scattered by film containing droplets with inhomogeneous anchoring. The analysis of transmittance and reflectance of the one-dimensional photonic crystals composed of monolayers is carried out. The formation of the photonic band gaps is analyzed.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Inverse mode of ion-surfactant method of director reorientation inside nematic droplets
Место публикации : Mol. Cryst. Liquid Cryst. - 2009. - Vol. 512, Is. 1. - P.1998-2003. - ISSN 1542-1406, DOI 10.1080/15421400903050814
Примечания : 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
Ключевые слова (''Своб.индексиров.''): 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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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Shabanov A. V., Zyryanov V. Ya.
Заглавие : Inverse mode of ionic-surfactant method of director reorientation inside nematic droplets
Коллективы : IInternational LC Conference
Место публикации : 22nd International LC Conference: Abstracts. - 2008. - Vol. 1. - P.380
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kirik S. D., Parfenov V. A., Zharkov S. M.
Заглавие : Monitoring MCM-41 synthesis by X-ray mesostructure analysis
Место публикации : Micropor. Mesopor. Mater.: Elsevier Science, 2014. - Vol. 195. - P.21-30. - ISSN 1387-1811, DOI 10.1016/j.micromeso.2014.04.012. - ISSN 1873-3093
Примечания : Cited References: 70. - The investigation was made with financial support of the Program of Presidium RAS (Project 24.37), RF State contracts No 02.740.11.0629, RFBR Grants: 11-03-00610a and 11-03-12161-ofi, RSF 14-13-000025.
Предметные рубрики: ORDERED MESOPOROUS MATERIALS
ORDERED MESOPOROUS MATERIALS
IN-SITU
POWDER DIFFRACTION
SILICA/SURFACTANT COMPOSITES
ELECTRON-MICROSCOPY
MOLECULAR-SIEVES
STABLE MCM-41
SILICA
ADSORPTION
Ключевые слова (''Своб.индексиров.''): hydrothermal stability--mcm-41--mesostructure--tem--x-ray diffraction
Аннотация: The electron density maps calculated from X-ray diffraction patterns of the mesoporous silica material MCM-41 present averaged mesostructure images which in contrast to transmission electron microscopy (TEM) images are exceptionally repeating and represent the whole sample. It was shown that the averaged mesostructure parameters such as a unit cell parameter, a pore diameter, a wall width, a pore shape estimated from the X-ray powder diffraction data in combination with the continuous electron density function approach allow monitoring continuous set of the silica framework states at different stages of the material synthesis. The mentioned technique supplemented by N 2-adsorption measurements and transmission electron microscopy was applied for consideration of the MCM-41 hydrothermal stability. Attention has been given to the variations of the synthesis conditions affecting the hydrothermal stability, in particular the maintaining the basicity of the synthesis solution as well the substitution of the synthesis solution with water or a salt solution at hydrothermal treatment. The averaged pore shape was observed to be changed from cylindrical to hexagonal-prismatic form. The observed wall thickness was in the range from 0.75 to 1.25 nm. The competition of silica polycondensation and surface hydrolysis was shown to be responsible for the variety of framework geometry and hydrothermal stability. It has been established that the pore diameter increases generally due to the osmotic pressure of water. If the pores acquire the average prismatic hexagonal shape, the sample has low hydrothermal stability. Under the conditions favorable for the polycondensation the pores have averaged cylindrical shape and material demonstrates higher hydrothermal stability. Cooperative mechanism of mesostructure destruction under hydrothermal conditions was observed using TEM data and was discussed in connection with irregular polycondensation. © 2014 Elsevier Inc. All rights reserved.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Loiko V. A., Zyryanov V. Y.
Заглавие : Electro-Optical Characteristics of Polymer-Dispersed Liquid Crystal Film Controlled by Ionic-Surfactant Method
Разночтения заглавия :авие SCOPUS: Electro-optical characteristics of polymer-dispersed liquid crystal film controlled by ionic-surfactant method
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 37, Is. 1. - P34-36. - ISSN 1063-7850, DOI 10.1134/S1063785011010056
Примечания : Cited References: 5. - This study was supported in part by Russian Federal Agencies (project nos. P901 and 02.740.11.0220), the Russian Foundation for Basic Research (project no. 08-03-01007), and the Siberian Branch of the Russian Academy of Sciences (project nos. 27.1, 110, and 144).
Аннотация: The electro-optical characteristics of a composite film based on a polymer containing dispersed nematic liquid crystal (NLC) doped with an ionic surfactant have been studied. The threshold character of the reorientation of NLC droplets as well as the dependence of the modulation amplitude of light transmission on the electric field strength has been revealed for the effect of ionic modification of surface anchoring. The dynamical parameters of the optical response have been determined.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Loiko V. A., Krakhalev M. N., Egamov M. H., Gerasimov V. P., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Light scattering in the stretched film of polymer dispersed liquid crystal doped with surfactant
Коллективы : Electromagnetic and Light Scattering Conference
Место публикации : 15th Electromag. and Light Scattering Conf. (ELS-XV): book of abstr. - 2015. - P.139
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14.

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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15.

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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prishchepa O. O., Zyryanov V. Ya., Gardymova A. P., Shabanov V. F.
Заглавие : Optical textures and orientational structures of nematic and cholesteric droplets with heterogeneous boundary conditions
Место публикации : Mol. Cryst. Liquid Cryst. - 2008. - Vol. 489, Is. 1. - P.84-93. - ISSN 1542-1406, DOI 10.1080/15421400802219817
Примечания : Cited Reference Count: 17. - Гранты: This work was supported in part by the grants of DSP, No 2.1.1.1814; RFBR, No 0803-01007; Council of the President of the RF for Support of Young Scientists and Leading Scientific Schools (projects NSh-3818-2008.3, MK-3624.2007.2); RAS, No 8.1, 2.10.2; SB RAS, No 33.Финансирующая организация: DSP [2.1.1.1814]; RFBR [0803-01007]; Young Scientists and Leading Scientific Schools [NSh-3818-2008.3, MK-3624.2007.2]; RAS [8.1, 2.10.2]; SB RAS [33]
Предметные рубрики: LIQUID-CRYSTAL DROPLETS
ELECTRIC-FIELD
BIPOLAR
Ключевые слова (''Своб.индексиров.''): director configuration--interfaces--nematic and cholesteric droplets--surfactant--director configuration--interfaces--nematic and cholesteric droplets--surfactant--boundary value problems--drop formation--drops--fluid mechanics--phospholipids--surface active agents--boundary conditioning--director configuration--homeotropic--interfaces--nematic and cholesteric droplets--nematic droplets--nematics--optical textures--orientational structures--surface anchoring--surfactant--boundary conditions
Аннотация: Brief review of the orientational structures within the droplets of chiral as well as achiral nematics with the heterogeneous boundary conditions is reported. The modification of boundary conditions in the 5CB/polyvinylbutyral and LN-396/cholesterylacetate/polyvinylbutyral compositions with the planar anchoring at the interface is created by addition of the homeotropic surfactant (lecithin). Sequences of the novel stable and non-stable orientational structures being realized within the droplets of achiral nematic are presented. For the LN-396 nematic droplets doped by cholesterylacetate the formation of a spherulite structure has been shown when the tangential surface anchoring is modified to the homeotropic one.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Timofeev I. V., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Orientational transition in the cholesteric layer induced by electrically controlled ionic modification of the surface anchoring
Коллективы : Russian Foundation for Basic Research (RFBR) [15-02-06924, 16-53-00073]; Siberian Branch of the Russian Academy of Sciences [II.2P 0358-2015-0010]; RFBR [16-32-60036, 16-32-00164]
Место публикации : Liq. Cryst.: Taylor & Francis, 2017. - Vol. 44, Is. 3. - P.484-489. - ISSN 0267-8292, DOI 10.1080/02678292.2016.1218557. - ISSN 1366-5855(eISSN)
Примечания : Cited References:38. - This work was supported by Russian Foundation for Basic Research (RFBR) [Grant Numbers 15-02-06924 and 16-53-00073] and by the Siberian Branch of the Russian Academy of Sciences under Complex Program [II.2P 0358-2015-0010]. V.S.S. acknowledges financial support from RFBR [Grant Numbers 16-32-60036 and 16-32-00164].
Предметные рубрики: NEMATIC LIQUID-CRYSTALS
FIELD
DROPLETS
CELL
ALIGNMENT
GRATINGS
Ключевые слова (''Своб.индексиров.''): cholesteric--ionic surfactant--anchoring transition--twisted hybrid--structure--electrooptics
Аннотация: A reorientation of cholesteric liquid crystal with a large helix pitch induced by the electrically controlled ionic modification of the surface anchoring has been studied. In initial state, the cholesteric helix is untwisted completely owing to the normal surface anchoring specified by the cations adsorbed at the substrates. As a result, the homeotropic director configuration is observed within the cell. Under the action of DC electric field, one of the substrates becomes free from the layer of surface active cations, therefore, setting the planar surface anchoring. The latter, in turn, leads to the formation of the hybrid chiral structure. The threshold value and dynamic parameters have been estimated for this process as well as the range of control voltages, which do not allow the electrohydrodynamic instabilities. The twisted hybrid director configuration observed in the experiment has been analysed by means of the simulation of polarisation change of light propagating through the cholesteric layer with asymmetric (planar and homeotropic) surface anchoring on the cell substrates.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Sutormin V. S., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Polar anchoring energy and tilt angle measured by magneto-optical technique in nematic doped with ionic surfactant
Место публикации : Liq. Cryst. - 2020. - Vol. 47, Is. 12. - P.1825-1831. - ISSN 0267-8292, DOI 10.1080/02678292.2020.1733683. - ISSN 1366-5855(eISSN)
Примечания : Cited References: 32
Предметные рубрики: LIQUID-CRYSTAL
TEMPERATURE-DEPENDENCE
INTERFACE
ADSORPTION
Аннотация: The surface anchoring of a nematic doped with the ionic surfactant has been investigated and compared with the one in the undoped sample. The director tilt angle at the substrates coated with the orienting polymer film has been determined by the null method in a rotating magnetic field. The Frederiks transition in a magnetic field has been chosen as a convenient technique to measure the polar anchoring energy Wθ. The temperature dependences of anchoring energy have been obtained for the various nematic cells. The Wθ values for nematic doped with the ionic surfactant are less than for the undoped one. The factors affecting the measurement accuracy have been discussed. The accuracy is higher for the thinner nematic layers and weaker anchoring energy.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Egamov M. H., Gerasimov V. P., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya., Loiko V. A.
Заглавие : Polarizing properties of a stretched film of a polymer-dispersed liquid crystal with a surfactant dopant
Коллективы : Russian Foundation for Basic Research [12-03-00816]; Presidium of the Russian Academy of Sciences [24.32, 24.29]; Siberian Section of the Russian Academy of Sciences (SO RAN); SO RAN; National Scientific Council of Taiwan
Место публикации : J. Opt. Technol.: Optical Society of America, 2014. - Vol. 81, Is. 7. - P.414-417. - ISSN 1070-9762, DOI 10.1364/JOT.81.000414. - ISSN 1091-0786
Примечания : Cited References: 17. - This work was carried out with the partial support of Grant 12-03-00816 of the Russian Foundation for Basic Research, Grants 24.32 and 24.29 of the Presidium of the Russian Academy of Sciences, and joint project 30 of the Siberian Section of the Russian Academy of Sciences (SO RAN), and a joint project of the SO RAN and the National Scientific Council of Taiwan.
Предметные рубрики: ANISOTROPY
Аннотация: The transmittance anisotropy of a composite polymer-liquid-crystal film has been studied as it varies with the degree to which it is elongated. The composite film includes polyvinyl alcohol, the nematic liquid crystal 4-n-pentyl-4'-cyanobiphenyl, and the surfeiting cetyltrimethylammonium bromide, which initiates homeotropic adhesion of the nematic to the surface of the polymer. It is shown that, when the film is uniaxially stretched, the transmittance of the orthogonally polarized component of directly transmitted radiation and accordingly the degree of polarization abruptly increase, reaching saturation when it is stretched to twice its length. Such variation of the film's macroscopic optical properties can be caused by an orientational-structural transition to a homogeneous configuration of the director in deformed droplets of the nematic and makes it possible to substantially improve the optical characteristics of light polarizers based on such composite media. (C) 2014 Optical Society of America.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Prishchepa V. S., Krakhalev M. N., Egamov M. H., Loiko V. A., Gerasimov V. P.
Заглавие : Polarizing properties of the elongated PDLC films doped by surfactant
Коллективы : International Liquid Crystal Conference (25; 2014 ; 29 June - 4 July 2014; Dublin, Ireland)
Место публикации : Book of abstracts of 25th International Liquid Crystal Conference (ILCC 2014). - 2014. - Ст.P3.040
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