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Каталог книг и брошюр библиотеки ИФ СО РАН

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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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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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Specific Features of Ionic-Surfactant Method to Control Liquid Crystals (ILCC 2014)
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
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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) : 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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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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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., 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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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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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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