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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prischepa O. O., Shabanov A. V., Zyryanov V. Y.
Заглавие : Transformation of director configuration upon changing boundary conditions in droplets of nematic liquid crystal
Место публикации : JETP Letters. - 2004. - Vol. 79, Is. 6. - P.257-261. - ISSN 0021-3640, DOI 10.1134/1.1759405
Примечания : Cited References: 12
Предметные рубрики: ISOTROPIC LIQUID
DROPS
Аннотация: The transformation of the director configuration upon changing boundary conditions from planar to homeotropic for bipolar nematic droplets dispersed in a polymeric matrix was studied. The characteristic textural patterns are presented for droplets with different concentrations of homeotropic surfactants, and their orientational structure is identified. The scenario predicted earlier by G.E. Volovik and O.D. Lavrentovich (ZhETF 85, 1997 (1983)) for the transformation of orientational structure of nematic droplets from bipolar to radial, without the formation of additional disclinations, is revealed. It is shown that, by using the computational method of minimization of the director elastic-strain energy in the droplet bulk and by introducing the inhomogeneous boundary conditions, one can obtain orientational structures that are analogous to the observed ones.(C) 2004 MAIK "Nauka / Interperiodica".
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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) : 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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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 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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Parshin A. M., Nazarov V. G., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Bistable director configurations in polymer dispersed nematic liquid crystals
Коллективы : IInternational LC Conference
Место публикации : 22nd International LC Conference: Abstracts. - 2008. - Vol. 1. - P.382
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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) : Сутормин, Виталий С., Крахалев, Михаил Н., Прищепа, Оксана О.
Заглавие : Температурно индуцированные изменения конфигурации директора в каплях нематика, диспергированного в поли- винилпирролидоне
Место публикации : Журнал Сибирского федерального университета. Серия: Математика и физика. - Красноярск: Федеральное государственное автономное образовательное учреждение высшего образования Сибирский федеральный университет, 2009. - Т. 2, № 3. - С. 352-359. - ISSN 1997-1397
Ключевые слова (''Своб.индексиров.''): граница раздела--interface--polymer dispersed liquid crystals--nematic--surfactant--surface anchoring--director configuration--капсулированные полимером жидкие кристаллы--нематик--сурфактант--поверхностное сцепление--конфигурация директора
Аннотация: В работе изучены преобразования конфигурации директора в каплях нематика, вызванные тер- моиндуцированной модификацией граничных условий. Исследования проводились для нематиче- ского жидкого кристалла 5СВ (4-н-пентил-4-цианобифенил), который допировался сурфактан- том лецитином, а затем диспергировался в поливинилпирролидоне. Показано, что при нагре- вании граничные условия изменяются от планарных к гомеотропным, что приводит к транс- формации конфигурации директора в капле нематика. При охлаждении образца наблюдалось об- ратное изменение поверхностного сцепления от гомеотропного к планарному. В обоих случаях ориентационно-структурные превращения могут происходить по двум различным сценариям.The transformations of the director configuration within the nematic droplets induced by temperature modification of boundary conditions have been studied. Nematic liquid crystal 5CB (4-n-penthyl-4- cyanobiphenyl) doped with lecithin and dispersed in polyvinylpyrrolidone has been tested. As was shown, under heating the boundary conditions are changed from planar to homeotropic. It results in transformation of the director configuration in the nematic droplets. The inverse modification of the surface anchoring from homeotropic to planar has been observed at cooling. In both cases the transformations of orientational structure may occur in two different scenarios.
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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 журнала
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Myslivets S. A., Gunyakov V. A., Parshin A. M., Arkhipkin V. G., Shabanov V. F., Lee, Wei
Заглавие : Magnetic-field tunable defect modes in a photonic-crystal/liquid-crystal cell
Место публикации : Opt. Express. - 2010. - Vol. 18, Is. 2. - P.1283-1288. - JAN 18. - ISSN 1094-4087, DOI 10.1364/OE.18.001283
Примечания : Cited Reference Count: 15. - Гранты: This work was partially supported by the Russian Federal Grant No. 02.740.11.0220 and SB RAS Grant Nos. 5, 27.1 and 144. W. Lee gratefully acknowledges financial support from the National Science Council of the Republic of China (Taiwan) under Grant No. NSC 98-2923-M-033-001-MY3 dedicated to an internationally joint effort between Russia and Taiwan.Финансирующая организация: Russian Federal [02.740.11.0220]; SB RAS [5, 27.1, 144]; National Science Council of the Republic of China (Taiwan) [NSC 98-2923-M-033-001-MY3]
Предметные рубрики: NEMATIC LIQUID-CRYSTAL
BAND-GAP MATERIALS
SPONTANEOUS EMISSION
SPECTRUM
Ключевые слова (''Своб.индексиров.''): crystal defects--magnetic fields--photonic crystals--applied magnetic fields--crossed polarizers--crystal cells--defect mode--homeotropic--light transmission spectra--light wave--nematic director--optical cells--planar alignment--spectral shift--tunable defect--light transmission--article--artifact--chemistry--electromagnetic field--liquid crystal--materials--materials testing--radiation exposure--refractometry--artifacts--electromagnetic fields--liquid crystals--manufactured materials--materials testing--refractometry
Аннотация: Light transmission spectrum of a multilayer photonic crystal with a central liquid-crystal defect layer placed between crossed polarizers has been studied. Transmittance was varied due to the magnetically induced reorientation of the nematic director from homeotropic to planar alignment. Two notable effects were observed for this scheme: the spectral shift of defect modes corresponding to the extraordinary light wave and its superposition with the ordinary one. As a result, the optical cell allows controlling the intensity of interfering defect modes by applied magnetic field. (C) 2010 Optical Society of America
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Gunyakov V. A., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Electric and magnetic field-assisted orientational transitions in the ensembles of domains in a nematic liquid crystal on the polymer surface
Коллективы : Russian Foundation for Basic Research [12-03-00816]; Siberian Branch of the Russian Academy of Sciences (SB RAS) [30, 24.29, 24.32]; SB RAS through a Taiwan-SB-RAS joint project
Место публикации : Int. J. Mol. Sci. - 2014. - Vol. 15, Is. 10. - P.17838-17851. - ISSN 1422-0067, DOI 10.3390/ijms151017838
Примечания : Cited References: 21. - This work was partially supported by the Russian Foundation for Basic Research (project No. 12-03-00816), and by the Siberian Branch of the Russian Academy of Sciences (SB RAS) through Grants Nos. 30, 24.29, 24.32, and by SB RAS through a Taiwan-SB-RAS joint project.
Предметные рубрики: FRANK CONSTANTS
INTERFACE
ALIGNMENT
DISCLINATIONS
STABILITY
COATINGS
DIRECTOR
Ключевые слова (''Своб.индексиров.''): liquid crystal--polycarbonate--domain structure--electric field--magnetic field
Аннотация: Using electro- and magneto-optical techniques, we investigated orientational transitions in the ensembles of domains in a nematic liquid crystal on the polycarbonate film surface under the conditions of competing surface forces that favor radial and uniform planar alignment of nematic molecules. Having analyzed field dependences of the intensity of light passed through a sample, we established the threshold character of the orientational effects, plotted the calculated intensity versus magnetic coherence length, and compared the latter with the equilibrium length that characterizes the balance of forces on the polymer surface.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Aleksandrovsky A. S., Chimitova O. D., Diao C. P., Gavrilova T. A., Kesler V. G., Molokeev M. S., Krylov A. S., Bazarov B. G., Bazarova J. G., Lin Z. S.
Заглавие : Electronic structure of β-RbSm(MoO4)2 and chemical bonding in molybdates
Коллективы : Ministry of Education and Science of the Russian Federation; National Natural Science Foundation of China [11174297, 11474292]; National Basic Research Project of China [2011CB922204]; Foundation of the Director of Technical Institute of Physics and Chemistry, CAS; RAS [24-29]; RFBR [13-02-00825]
Разночтения заглавия :. в WoS: Electronic structure of beta-RbSm(MoO4)2 and chemical bonding in molybdates
Место публикации : Dalton Trans.: Royal Society of Chemistry, 2015. - Vol. 44, Is. 4. - P.1805-1815. - ISSN 1477-9226, DOI 10.1039/c4dt03203a. - ISSN 1477-9234
Примечания : Cited References: 121. - VVA and ASA gratefully acknowledge the Ministry of Education and Science of the Russian Federation for financial support. ZL acknowledges the support by National Natural Science Foundation of China (11174297 and 11474292), the National Basic Research Project of China (2011CB922204), and Foundation of the Director of Technical Institute of Physics and Chemistry, CAS. The work was partially supported by RAS Project 24-29 and RFBR Grant 13-02-00825.
Предметные рубрики: RAY PHOTOELECTRON-SPECTROSCOPY
CRYSTAL-STRUCTURE
X-RAY
NEUTRON-DIFFRACTION
MAGNETIC-PROPERTIES
PHASE-FORMATION
CORE LEVELS
2ND-HARMONIC GENERATION
LUMINESCENCE PROPERTIES
VIBRATIONAL PROPERTIES
Аннотация: Microcrystals of orthorhombic rubidium samarium molybdate, beta-RbSm(MoO4)(2), have been fabricated by solid state synthesis at T = 450 degrees C, 70 h, and at T = 600 degrees C, 150 h. The crystal structure has been refined by the Rietveld method in space group Pbcn with cell parameters a = 5.0984(2), b = 18.9742(6) and c = 8.0449(3) angstrom (R-B = 1.72%). Thermal properties of beta-RbSm(MoO4)(2) were traced by DSC over the temperature range of T = 20-965 degrees C, and the earlier reported β ↔ α phase transition at T similar to 860-910 degrees C was not verified. The electronic structure of beta-RbSm(MoO4) 2 was studied by employing theoretical calculations and X-ray photoelectron spectroscopy. It has been established that the O 2p-like states contribute mainly to the upper part of the valence band and occupy the valence band maximum, whereas the Mo 4d-like states contribute mainly to the lower part of the valence band. Chemical bonding effects have been analysed from the element core level binding energy data. In addition, it was found that the luminescence spectrum of beta-RbSm(MoO4)(2) is rather peculiar among the Sm3+ containing materials. The optical refractive index dispersion in beta-RbSm(MoO4)(2) was also predicted by the first-principles calculations.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : The director field distribution with the strongly pinned alignment in nematic structures at the polymer surface
Коллективы : Russian Foundation for Basic Research [12-03-00816], Siberian Branch ofthe Russian Academy of Sciences (SB RAS) [30, 24.29, 24.32], SB RASthrough a Taiwan-SB RAS joint project
Место публикации : Liq. Cryst.: Taylor & Francis, 2015. - Vol. 42, Is. 1. - P.57-64. - ISSN 0267, DOI 10.1080/02678292.2014.960904. - ISSN 13665855(eISSN)
Примечания : Cited References:18. - This work was partially supported by the Russian Foundation for BasicResearch [project No. 12-03-00816] and by the Siberian Branch of theRussian Academy of Sciences (SB RAS) [grants nos. 30, 24.29, 24.32] andby SB RAS through a Taiwan-SB RAS joint project.
Предметные рубрики: LIQUID-CRYSTALS
DISCLINATION LINES
DEFECTS
Ключевые слова (''Своб.индексиров.''): orientational order--disclination--adsorption--nematic--polymer surface--director configuration
Аннотация: We investigate orientational nematic liquid crystal structures that form at the polymer surface due to adsorption, their stability against the schlieren texture and features of point and linear singularities in them. We demonstrate that surface disclination lines, which also occur due to molecular adsorption, can lead to azimuthal anchoring of a bulk layer and make the singularities with the charge m=+/- 1 stable. We consider the director field distribution in a nematic layer as a result of the combination of two aligning factors, which are the linear disclination that tend to impose uniform planar ordering and point defects that impart the radial configuration to the director. With the use of the calculation, we analyse the energies of elastic distortions of the director field for the radial-planar, radial-homeotropic and radial-radial configurations, depending on the nematic layer thickness.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович, Зырянов, Виктор Яковлевич, Шабанов, Василий Филиппович
Заглавие : Конфигурации директора в структурах нематика, адсорбированного на поверхности полимера
Место публикации : Жидк. кристаллы и их практич. использ. - 2015. - Т. 15, Вып. 1. - С. 56-65. - ISSN 1991-3966; \b Liquid Crystals and their Application
Примечания : Библиогр.: 20. - Работа выполнена частично при финансовой поддержке программ Президиума РАН и РФФИ (грант № 15-02-06924).
Ключевые слова (''Своб.индексиров.''): нематический жидкий кристалл--полимер--адсорбция--дисклинация--конфигурация директора--nematic liquid crystal--polymer--adsorption--disclination--director configuration
Аннотация: Исследованы ориентационные структуры нематических жидких кристаллов, возникающие на поверхности полимера в результате адсорбции, и их устойчивость относительно шлирен-текстуры. Изучены особенности точечных и линейных сингулярностей в исследуемых структурах. Рассмотрены конфигурации директора в слое нематика, определяемые комбинацией двух ориентирующих факторов: воздействием линейной дисклинации, фактора, стремящегося задать однородное планарное упорядочение, а также влиянием точечного дефекта, задающего радиальную структуру директора. С использованием расчетного метода проведен сравнительный анализ энергии упругих искажений поля директора для различных видов конфигураций: радиально-планарной, радиально-гомеотропной и радиально-радиальной в зависимости от толщины слоя нематика.The orientational structures of nematic liquid crystals that form at the polymer surface due to adsorption and their stability with respect to the schlieren texture are investigated. Features of point and linear singularities in these structures are studied. The director configurations in nematic layer as a result of the combination of two aligning factors, which are the linear disclination that tends to impose uniform planar ordering and point defect that imparts the radial structure to the director are considered. The analysis of the elastic distortions energies of the director configurations for the radial-planar, radial-homeotropic and radial-radial structures, depending on the nematic layer thickness was performed using the calculation method.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Krakhalev M. N., Konkolovich A. V., Prishchepa O. O., Miskevich A. A., Zyryanov V. Ya.
Заглавие : Experimental results and theoretical model to describe angular dependence of light scattering by monolayer of nematic droplets
Коллективы : Conference on Electromagnetic and Light Scattering
Место публикации : J. Quant. Spectrosc. Radiat. Transf.: PERGAMON-ELSEVIER SCIENCE LTD, 2016. - Vol. 178: Electromagnetic and light scattering by nonspherical particles XV: Celebrating 150 years of Maxwell's electromagnetics. - P.263-268. - ISSN 0022-4073, DOI 10.1016/j.jqsrt.2015.10.024. - ISSN 1879-1352(eISSN)
Примечания : Cited References:25
Предметные рубрики: Dispersed liquid-crystals
Inhomogeneous boundary-conditions
Films
Transmittance
Radiation
Ключевые слова (''Своб.индексиров.''): polymer-dispersed liquid crystal film--liquid crystal droplet--director--configuration--light scattering--monolayer of droplets
Аннотация: Light scattering by a monolayer of bipolar nematic droplets encapsulated in polymer film is examined both experimentally and theoretically. A method for the simulation of the angular distribution of scattered light is based on the anomalous diffraction and interference approximations taking into account the director configuration within liquid crystal droplets and their bipolar axes orientation. The director configuration in nematic droplets is calculated using the relaxation method of the free energy minimization. The characteristics of the sample, including distribution of droplet sizes and shape anisometry, are measured in details. The experimental results and theoretical data agree closely with each other. (C) 2015 Elsevier Ltd. All rights reserved.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang, Xingxing, Molokeev M. S., Gong, Pifu, Yang, Y.i., Wang, Wei, Wang, Shuaihua, Wu, Shaofan, Wang, Yingxia, Huang, Rongjin, Li, Laifeng, Wu, Yicheng, Xing, Xianran, Lin, Zheshuai
Заглавие : Near-zero thermal expansion and high ultraviolet transparency in a borate crystal of Zn4B6O13
Коллективы : Special Foundation of the Director of Technical Institute of Physics and Chemistry (TIPC); National Scientific Foundations of China [11474292, 51401224]; China "863" project [2015AA034203]
Место публикации : Adv. Mater.: Wiley-VCH Verlag, 2016. - Vol. 28, Is. 36. - P.7936-7940. - ISSN 0935-9648, DOI 10.1002/adma.201601816. - ISSN 1521-4095(eISSN)
Примечания : Cited References:38. - The authors acknowledge Zhuohong Yin for useful discussion and Dr. Siyang Luo for the help in crystal fabrication. This work was supported by the Special Foundation of the Director of Technical Institute of Physics and Chemistry (TIPC), the National Scientific Foundations of China (Grant 11474292 and 51401224), and China "863" project (No. 2015AA034203).
Предметные рубрики: ZN4O(BO2)6
TETRAHEDRA
BEHAVIOR
RANGE
Аннотация: Intrinsic isotropic near-zero thermal expansion is discovered in borate crystal Zn4B6O13 with high transparency in the ultraviolet region. First-principles calculations demonstrate that the very low thermal expansion originates mainly from the invariability of the solid [B24O48] truncated octahedra that are fixed by the [Zn4O13] clusters in the ZBO structure.
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17.

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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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sutormin V. S., Timofeev I. V., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Director reorientation induced by electrically controlled anchoring transition in cholesteric layer
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.O34. - P.8
Примечания : Библиогр.: 4
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yelisseyev A. P., Molokeev M. S., Jiang, Xingxing, Krinitsin P. G., Isaenko L. I., Lin, Zheshuai
Заглавие : Structure and optical properties of the Li2In2GeSe6 crystal
Коллективы : Russian Foundation of Basic Research [15-02-03408a, 17-45-540775r_a, 17-52-53031]; National Scientific Foundations of China [11474292, 51702330, 11611530680, 91622118, 91622124]; special foundation of the director of Technical Institute of Physics and Chemistry (TIPC); China "863" project [2015AA034203]; Youth Innovation Promotion Association, CAS [2017035]; [0330-2016-0008]
Место публикации : J. Phys. Chem. C. - 2018. - Vol. 122, Is. 30. - P.17413-17422. - ISSN 1932-7447, DOI 10.1021/acs.jpcc.8b02799
Примечания : Cited References: 49. - This work was supported by state assignment project #0330-2016-0008 and partly by the Russian Foundation of Basic Research (grants nos. 15-02-03408a, 17-45-540775r_a, and 17-52-53031), National Scientific Foundations of China (grants 11474292, 51702330, 11611530680, 91622118, and 91622124), the special foundation of the director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (no. 2015AA034203), and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and grant 2017035 for X.J.).
Предметные рубрики: PHASE-MATCHING PROPERTIES
TEMPERATURE-DEPENDENCE
ELECTRONIC-STRUCTURE
Аннотация: Intense search for new nonlinear optical crystals for the mid-infrared region is in progress, and Li-containing quaternary chalcogenides are expected to improve transparency range, stability, phase-matching conditions, and other parameters in comparison with commercially available AgGaS2, AgGaSe2, and ZnGeP2. Single crystals of Li2In2GeSe6 up to 8 mm in size were obtained by the Bridgman- Stockbarger growth technique, and their high quality was confirmed by exciton luminescence. A monoclinic structure and direct band-to-band electronic transitions were established, and the thermal expansion was shown to be virtually isotropic. Defect-related absorption and luminescence were revealed, and the way to lower them was suggested. The electronic structure, density of states, and some optical properties were calculated from the first principles for Li2In2GeSe6. The calculated nonlinear coefficients and rather large birefringence indicate a strong phase-matching ability. These investigations demonstrate that Li2In2GeSe6 is a promising mid-infrared nonlinear optical crystal.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Bikbaev R. G., Sutormin V. S., Timofeev I. V., Zyryanov V. Ya.
Заглавие : Nematic and Cholesteric Liquid Crystal Structures in Cells with Tangential-Conical Boundary Conditions
Коллективы : Russian Science Foundation [18-72-10036]
Место публикации : Crystals. - 2019. - Vol. 9, Is. 5. - Ст.249. - ISSN 2073-4352, DOI 10.3390/cryst9050249
Примечания : Cited References: 43. - This work was supported by the Russian Science Foundation (No. 18-72-10036).
Предметные рубрики: TRANSITION
GRATINGS
Аннотация: Orientational structures formed in nematic and cholesteric layers with tangential-conical boundary conditions have been investigated. LC cells with one substrate specifying the conical surface anchoring and another substrate specifying the tangential one have been considered. The director configurations and topological defects have been identified analyzing the texture patterns obtained by polarizing microscope in comparison with the structures and optical textures calculated by free energy minimization procedure of director field and finite-difference time-domain method, respectively. The domains, periodic structures and two-dimensional defects proper to the LC cells with tangential-conical anchoring have been studied depending on the layer thickness and cholesteric pitch.
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