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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : VETROV S. Y., SADREEV A. F., SHABANOV A. V., SHABANOV V. F.
Заглавие : ORIENTATION STRUCTURE OF CAPSULATED CHOLESTERICS
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 104, Is. 5. - P3630-3642. - ISSN 0044-4510
Примечания : Cited References: 27
Предметные рубрики: LIQUID-CRYSTALS
DROPLETS
DEPENDENCE
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Smorgon S. L., Shabanov V. F., Andreev A. L., Pozhidaev E. P., Kompanets I. N.
Заглавие : Volume bistabiljty in ferroelectric liquid crystal droplets
Коллективы : International Liquid Crystal Conference
Место публикации : 16th International Liquid Crystal Conference (ILCC 1996): program and abstract book. - 1996. - Ст.D1P.24. - P.168
Аннотация: The effect ofvolume bistability (VB) has recently been discovered and analysed [1] in thick (15 mem and more) layers ofpurposefully created ferroelectric liquid crystal (FLC) compositions. VB is a phenomenon that is mainly associated with the stereochemical nature of the FLC composition and is practically independent of the surface. We have studied the characteristics of planar-oriented PDFLC films obtained based on the above compositions. The effect of VB is shown to take place in large-size droplets. Unlike pure layers, VB in FLC droplets is of a reverse nature, i.e. an optical state is memorised that is opposite to the optical state corresponding to the polarity ofthe driving pulse. We discuss the features typical of VB in FLC droplets and make a comparison between the results obtained and the results ofsurface bistability studies in FLC droplets [2].
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Presnyakov V. V., Smorgon S. L., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Friedericksz transition in elongated nematic droplets
Коллективы : International Liquid Crystal Conference
Место публикации : 16th International Liquid Crystal Conference (ILCC 1996): program and abstract book. - 1996. - Ст.B1P.10. - P.44
Аннотация: We have studied the process of reorientation of 5CB nematic droplets dispersed in a stretched polyvinylbutyral film. Unlike [1,2], poles ofbipolar droplets have been observed to remain fixed. Reorientation starts at the centre of the droplet gradually progressing towards the droplet surface. It has been found that in samples containing large droplets, the light transmission dependence on the applied voltage has an oscillating behaviour. A qualitative explanation to this phenomenon can be given by using the anomal diffraction approach presented in [3]. An experimental technique is described to determine the Friedericksz threshold value in polymer dispersed nematic liquid crystals. The Friedericksz threshold value has been measured versus the size and the shape ofthe nematic droplets. The results obtained are analysed in terms oftheoretical models [1,2].
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Presnyakov V. V., Zyryanov V. Ya., Shabanov V. F., Vetrov S. Ya.
Заглавие : Friedericksz threshold field in bipolar droplets with rigidly fixed poles
Коллективы : International Liquid Crystal Conference
Место публикации : 17th International Liquid Crystal Conference (ILCC 1998): program and abstract book. - 1998. - P.253
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Smorgon S. L., Zyryanov V. Ya., Shabanov V. F., Pozhidaev E. P.
Заглавие : Textures and orientational structures of elongated FLC droplets in polymer matrix
Коллективы : International Liquid Crystal Conference
Место публикации : 17th International Liquid Crystal Conference (ILCC 1998): program and abstract book. - 1998. - P.252
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Smorgon S. L., Shabanov V. F., Pozhidaev E. P.
Заглавие : Orientational structures of elongated droplets of ferroelectric liquid crystals in polymer matrix
Место публикации : Molecular Materials. - 1998. - Vol. 9, N. 2. - P.139-145
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Smorgon S. L., Shabanov V. F., Pozhidaev E. P.
Заглавие : Orientational structures of elongated droplets of ferroelectric liquid crystals in polymer matrix
Место публикации : Molecular crystals and liquid crystals science and technology : section C- Molecular materials. - 1998. - Vol. 9, Is. 2. - P.139-145
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Presnyakov V. V., Vetoshkin S. A., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Electro-optical response of uniaxially oriented PDChLC films with various droplets anisometry and concentration of the chiral additive
Коллективы : MRS Spring meeting
Место публикации : MRS (Materials Research Society) Spring meeting: abstracts. - 1999. - Symposium D - Liquid Crystal Materials and Devices. - Ст.D6.1. - P.85
Аннотация: Uniaxially oriented films of polymer dispersed cholesteric liquid crystals (PDChLC) is a new perspective material for multifunctional optoelectronic elements. The material presents a polymer film with an ensemble of elongated cholesteric droplets dispersed therein. Long axes of the droplets are oriented preferably uniaxially in the film plane. These films reveal a great anisotropy of the polarized light transparency, which depends strongly on the applied electric field, concentration of the chiral additive and shape of the droplets. We have found the optimal composition and droplets anisometry to produce the films, which can be switched by applied voltage between three different optical states: scattering light of any polarization, transmitting the one linear-polarized component only and transparency for light any polarization. A device employing these films may be used as a modulator of the whole of the light, as a modulator of one linearly polarized component only and as a light polarizer.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mendez-Bermudez J. A., Luna-Acosta G. A., Seba P., Pichugin K. N.
Заглавие : Chaotic waveguide-based resonators for microlasers
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2003. - Vol. 67, Is. 16. - Ст.161104. - ISSN 1098-0121, DOI 10.1103/PhysRevB.67.161104
Примечания : Cited References: 33
Предметные рубрики: QUANTUM-CLASSICAL CORRESPONDENCE
MORPHOLOGY-DEPENDENT RESONANCES
DIRECTIONAL EMISSION
OPTICAL CAVITIES
MICRODISK LASERS
WAVE CHAOS
DROPLETS
PRECESSION
BILLIARDS
STATES
Аннотация: We propose the construction of highly directional emission microlasers using two-dimensional high-index semiconductor waveguides as open resonators. The prototype waveguide is formed by two collinear leads connected to a cavity of certain shape. The proposed lasing mechanism requires that the shape of the cavity yield mixed chaotic ray dynamics so as to have the approplate (phase space) resonance islands. These islands allow, via Heisenberg's uncertainty principle, the appearance of quasibound states (QBSs) which, in turn, propitiate the lasing mechanism. The energy values of the QBSs are found through the solution of the Helmholtz equation. We use classical ray dynamics to predict the direction and intensity of the lasing produced by such open resonators for typical values of the index of refraction.
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10.

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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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Y., Krakhalev M. N., Prishchepa O. O., Shabanov A. V.
Заглавие : Orientational structure transformations caused by the electric-field-induced ionic modification of the interface in nematic droplets
Разночтения заглавия :авие SCOPUS: Orientational structure transformations caused by the electric-field- induced ionic modification of the interface in nematic droplets
Место публикации : JETP Letters. - 2007. - Vol. 86, Is. 6. - P.383-388. - ISSN 0021-3640, DOI 10.1134/S0021364007180087
Примечания : Cited References: 18
Предметные рубрики: LIQUID
TRANSITIONS
FILMS
Аннотация: The films of a polymer-dispersed nematic liquid crystal doped with an ionic surfactant were studied. The surface-anchoring modification effect caused by the local increase in the concentration of surface-active ions was observed at the polymer-liquid crystal interface under the action of an electric field. The modification of the boundary conditions leads to the transformation of the orientational structure of the nematic droplets and, as a result, to an appreciable change in their texture patterns and light-scattering efficiency at the interfaces. The monopolar director configurations (normal and curved) arising in the process of orientational structure transformations are considered and their typical textures are demonstrated. The possibility that the monopolar structure can be formed is theoretically substantiated by the computer simulation of the director field in a nematic droplet with the boundary conditions corresponding to the experiment.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prishchepa O. O., Shabanov A. V., Zyryanov V. Y., Parshin A. M., Nazarov V. G.
Заглавие : Friedericksz threshold field in bipolar nematic droplets with strong surface anchoring
Место публикации : JETP Letters. - 2007. - Vol. 84, Is. 11. - P.607-612. - ISSN 0021-3640, DOI 10.1134/S0021364006230081
Примечания : Cited References: 11
Предметные рубрики: FRANK CONSTANTS
Ключевые слова (''Своб.индексиров.''): 61.30.-v
Аннотация: A numerical method has been developed for calculating the director configuration in ellipsoidal droplets of a nematic liquid crystal with strong tangential anchoring in a uniform magnetic field of an arbitrary orientation. A relation has been obtained for determining the Friedericksz threshold corresponding to the beginning of the reorientation of the central region of a droplet when the field is orthogonal to the biopolar axis. The effect of the breaking of the orthogonal condition on the threshold character of the orientation process is considered. The reorientation of the ensemble of bipolar droplets of the 5CB nematic liquid crystal dispersed in polyvinyl butyral has been studied by the magneto-optical method. Comparative analysis of calculation data and measured values of the threshold field has been performed.
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14.

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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15.

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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prishchepa O. O., Parshin A. M., Shabanov A. V., Zyryanov V. Ya.
Заглавие : Magneto-optical study of Friedericksz threshold in polymer dispersed nematic liquid crystals
Коллективы : International Topical Meeting on Optics of Liquid Crystals
Место публикации : Mol. Cryst. Liquid Cryst. - 2008. - Vol. 488, Is. 1. - P.309-316. - ISSN 1542-1406, DOI 10.1080/15421400802241167
Примечания : Cited Reference Count: 11
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): friedericksz threshold--nematic--magneto-optics--polymer dispersed liquid crystals--surface anchoring--friedericksz threshold--magneto-optics--nematic--polymer dispersed liquid crystals--surface anchoring--computer systems--crystallography--drop formation--drops--fluid mechanics--light sources--liquid crystals--magnetos--optical engineering--powders--approximate formulas--calculation data--computer modelling--friedericksz threshold--magneto-optical--magneto-optics--measured values--nematic--nematic droplets--poly vinyl butyral--polymer dispersed liquid crystals--reorientation processes--surface anchoring--threshold fields--nematic liquid crystals
Аннотация: A computer model of reorientation processes in the bipolar nematic droplets of ellipsoidal form with strong tangential anchoring has been developed. The approximate formula to estimate the Friedericksz threshold has been obtained when the operating field (electric or magnetic) is orthogonal to the bipolar axis. The dependence of the threshold field on the droplet form has been considered. The reorientation of the bipolar droplets of 5CB nematic liquid crystal dispersed in polyvinylbutyral has been studied by the magneto-optical method. The calculation data are in good agreement with measured values of the threshold field.
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17.

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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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Krakhalev M. N., Prishchepa O. O., Shabanov A. V.
Заглавие : Inverse Regime of Ionic Modification of Surface Anchoring in Nematic Droplets
Коллективы :
Разночтения заглавия :авие SCOPUS: Inverse regime of ionic modification of surface anchoring in nematic droplets
Место публикации : JETP Letters. - 2008. - Vol. 88, Is. 9. - P.597-601. - ISSN 0021-3640, DOI 10.1134/S002136400821011X
Примечания : Cited References: 15. - This work was supported by the Russian Foundation for Basic Research (project no. 08-03-01007), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project nos. NSh-3818.2008.3 and MK-3624.2007.2), RNP (project no. 2.1.1.1814), by the Russian Science Support Foundations, by the Siberian Branch of Russian Academy of Sciences (project nos. 8.1; 31). by the Krasnoyarsk Regional Scientific Foundation (grant no. 18G003).
Предметные рубрики: DEFECTS
FILMS
Аннотация: It was found that the effect of the ionic modification of anchoring in liquid-crystal droplets can be implemented in the inverse regime. Droplets of 4-n-pentyl-4'-cyanobiphenyl nematic doped with ionic cetyltrimethylammonium bromide surfactant were dispersed in polyvinyl alcohol and investigated. In the initial state, nematic droplets have a radial structure with homogeneous homeotropic anchoring typical of the surfactant used. In the presence of a de electric field, the boundary conditions become tangential in the surface area left by the cations. That results in the transformation of an orientational structure following by various scenarios. For the new states of nematic droplets, the distribution of the director field was analyzed and the corresponding textural patterns were numerically calculated.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Maschke U., Zyryanov V. Y., Konkolovich A. V., Misckevich A. A.
Заглавие : Small-Angle Light Scattering from Polymer-Dispersed Liquid-Crystal Films
Разночтения заглавия :авие SCOPUS: Small-angle light scattering from polymer-dispersed liquid-crystal films
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 107, Is. 4. - P692-698. - ISSN 1063-7761, DOI 10.1134/S1063776108100178
Примечания : Cited References: 20
Предметные рубрики: NEMATIC DROPLETS
Ключевые слова (''Своб.индексиров.''): abs resins--angular distribution--drop formation--drops--light--light scattering--phase transitions--plastic films--polymer films--polymers--polynomial approximation--powders--angle light scatterings--anomalous diffractions--crystal films--cylindrical symmetries--droplet sizes--induced phase transitions--optical wavelengths--pdlc films--scattered lights--scattering approximations--single layers--liquid crystal polymers
Аннотация: A method is developed for modeling and computing the angular distribution of light scattered forward from a single-layer polymer-dispersed liquid-crystal (PDLC) film. The method is based on effective-medium approximation, anomalous diffraction approximation, and far-field single-scattering approximation. The angular distribution of forward-scattered light is analyzed for PDLC films with droplet size larger than the optical wavelength. The method can be used to study field- and temperature-induced phase transitions in LC droplets with cylindrical symmetry by measuring polarized scattered light intensity.
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20.

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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