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ORIENTATION STRUCTURE OF CAPSULATED CHOLESTERICS / S. Y. VETROV [и др.] // Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 104, Is. 5. - P. 3630-3642. - Cited References: 27 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTALS
DROPLETS
DEPENDENCE

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Доп.точки доступа:
VETROV, S. Y.; SADREEV, A. F.; SHABANOV, A. V.; SHABANOV, V. F.
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Volume bistabiljty in ferroelectric liquid crystal droplets / V. Ya. Zyryanov, S. L. Smorgon, V. F. Shabanov [et al.] // 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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Доп.точки доступа:
Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Smorgon, S. L.; Сморгон, Сергей Леонидович; Shabanov, V. F.; Шабанов, Василий Филиппович; Andreev, A. L.; Pozhidaev, E. P.; Пожидаев Е. П.; Kompanets, I. N.; International Liquid Crystal Conference(16 ; 1996 ; 24-28 June ; Kent, US)
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Friedericksz transition in elongated nematic droplets / V. V. Presnyakov, S. L. Smorgon, V. F. Shabanov, V. Ya. Zyryanov // 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].

Материалы конференции

Доп.точки доступа:
Presnyakov, V. V.; Smorgon, S. L.; Сморгон, Сергей Леонидович; Shabanov, V. F.; Шабанов, Василий Филиппович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; International Liquid Crystal Conference(16 ; 1996 ; 24-28 June ; Kent, US)
}
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Friedericksz threshold field in bipolar droplets with rigidly fixed poles / V. V. Presnyakov, V. Ya. Zyryanov, V. F. Shabanov, S. Ya. Vetrov // 17th International Liquid Crystal Conference (ILCC 1998) : program and abstract book. - 1998. - P. 253

Материалы конференции

Доп.точки доступа:
Presnyakov, V. V.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович; Vetrov, S. Ya.; Ветров, Степан Яковлевич; International Liquid Crystal Conference(17 ; 1998 ; 19-24 July ; Strasbourg)
}
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Textures and orientational structures of elongated FLC droplets in polymer matrix / S. L. Smorgon, V. Ya. Zyryanov, V. F. Shabanov, E. P. Pozhidaev // 17th International Liquid Crystal Conference (ILCC 1998) : program and abstract book. - 1998. - P. 252

Материалы конференции

Доп.точки доступа:
Smorgon, S. L.; Сморгон, Сергей Леонидович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович; Pozhidaev, E. P.; International Liquid Crystal Conference(17 ; 1998 ; 19-24 July ; Strasbourg)
}
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Zyryanov, V. Ya.
Orientational structures of elongated droplets of ferroelectric liquid crystals in polymer matrix / V. Ya. Zyryanov, S. L. Smorgon, V. F. Shabanov, E. P. Pozhidaev // Molecular Materials. - 1998. - Vol. 9, N. 2. - P. 139-145

Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA

Доп.точки доступа:
Smorgon, S. L.; Сморгон, Сергей Леонидович; Shabanov, V. F.; Шабанов, Василий Филиппович; Pozhidaev, E. P.; Зырянов, Виктор Яковлевич
}
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Orientational structures of elongated droplets of ferroelectric liquid crystals in polymer matrix / V. Ya. Zyryanov, S. L. Smorgon, V. F. Shabanov, E. P. Pozhidaev // Molecular crystals and liquid crystals science and technology : section C- Molecular materials. - 1998. - Vol. 9, Is. 2. - P. 139-145

Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA

Доп.точки доступа:
Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Smorgon, S. L.; Shabanov, V. F.; Шабанов, Василий Филиппович; Pozhidaev, E. P.
}
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Electro-optical response of uniaxially oriented PDChLC films with various droplets anisometry and concentration of the chiral additive / V. V. Presnyakov, S. A. Vetoshkin, V. Ya. Zyryanov, V. F. Shabanov // 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.

Материалы конференции

Доп.точки доступа:
Presnyakov, V. V.; Пресняков, Владимир Валентинович; Vetoshkin, S. A.; Ветошкин, Сергей А.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович; MRS Spring meeting(1999 ; April 5–9 ; San Francisco, USA)
}
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Chaotic waveguide-based resonators for microlasers / J. A. Mendez-Bermudez [et al.] // Phys. Rev. B. - 2003. - Vol. 67, Is. 16. - Ст. 161104, DOI 10.1103/PhysRevB.67.161104. - Cited References: 33 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
Univ Autonoma Puebla, Inst Fis, Puebla 72570, Mexico
Univ Hradec Kralove, Dept Phys, Hradec Kralove, Czech Republic
Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Mendez-Bermudez, J. A.; Luna-Acosta, G. A.; Seba, P.; Pichugin, K. N.; Пичугин, Константин Николаевич
}
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10.

Prischepa, O. O.
Transformation of director configuration upon changing boundary conditions in droplets of nematic liquid crystal / O. O. Prischepa, A. V. Shabanov, V. Y. Zyryanov // JETP Letters. - 2004. - Vol. 79, Is. 6. - P. 257-261, DOI 10.1134/1.1759405. - Cited References: 12 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
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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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation

Доп.точки доступа:
Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Y.; Зырянов, Виктор Яковлевич; Prishchepa, O. O.
}
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11.

Prishchepa, O. O.
Director configurations in nematic droplets with inhomogeneous boundary conditions / O. O. Prishchepa, A. V. Shabanov, V. Y. Zyryanov // Phys. Rev. E. - 2005. - Vol. 72, Is. 3. - Ст. 31712, DOI 10.1103/PhysRevE.72.031712. - Cited References: 22 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
DISPERSED LIQUID-CRYSTALS
TRANSITION
Кл.слова (ненормированные):
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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Держатели документа:
LV Kirenskii Inst Phys, Akademgorodok, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Y.; Зырянов, Виктор Яковлевич; Прищепа, Оксана Олеговна
}
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12.

Orientational structure transformations caused by the electric-field-induced ionic modification of the interface in nematic droplets / V. Y. Zyryanov [et al.] // JETP Letters. - 2007. - Vol. 86, Is. 6. - P. 383-388, DOI 10.1134/S0021364007180087. - Cited References: 18 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
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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Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Krasnoyarsk Scientific Center, Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Zyryanov, V. Y.; Зырянов, Виктор Яковлевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич
}
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13.

Friedericksz threshold field in bipolar nematic droplets with strong surface anchoring / O. O. Prishchepa [et al.] // JETP Letters. - 2007. - Vol. 84, Is. 11. - P. 607-612, DOI 10.1134/S0021364006230081. - Cited References: 11 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
FRANK CONSTANTS
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademogorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Y.; Зырянов, Виктор Яковлевич; Parshin, A. M.; Паршин, Александр Михайлович; Nazarov, V. G.
}
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14.

Director transformations within nematic droplets dispersed in polyvinylpirrolydon induced by temperature and moisture / Sutormin V.S., Krakhalev M.N., Prishchepa O.O., Zyryanov V.Ya. // 22nd International LC Conference : Abstracts. - 2008. - Vol. 1. - P. 378

Доп.точки доступа:
Sutormin, V. S.; Сутормин, Виталий Сергеевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; IInternational LC Conference(22 ; 2008 ; Jeju, Korea)
}
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15.

    Optical textures and orientational structures of nematic and cholesteric droplets with heterogeneous boundary conditions / O. O. Prishchepa [et al.] // Mol. Cryst. Liquid Cryst. - 2008. - Vol. 489, Is. 1. - P. 84-93, DOI 10.1080/15421400802219817. - 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] . - ISSN 1542-1406
Рубрики:
LIQUID-CRYSTAL DROPLETS
   ELECTRIC-FIELD
   BIPOLAR
Кл.слова (ненормированные):
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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Держатели документа:
Siberian Fed Univ Krasnoyarsk, Krasnoyarsk Sci Ctr, SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
L.V. Kirensky Institut of physics

Доп.точки доступа:
Prishchepa, O. O.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Gardymova, A. P.; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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16.

Magneto-optical study of Friedericksz threshold in polymer dispersed nematic liquid crystals / O. O. Prishchepa [et al.] // Mol. Cryst. Liquid Cryst. - 2008. - Vol. 488, Is. 1. - P. 309-316, DOI 10.1080/15421400802241167. - Cited Reference Count: 11 . - ISSN 1542-1406
Рубрики:

Кл.слова (ненормированные):
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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Держатели документа:
Siberian Fed Univ, SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Prishchepa, O. O.; Parshin, A. M.; Паршин, Александр Михайлович; Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; International Topical Meeting on Optics of Liquid Crystals(12th ; OCT 01-05, 2007 ; Puebla, MEXICO)
}
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17.

Inverse mode of ionic-surfactant method of director reorientation inside nematic droplets / Krakhalev M.N., Prishchepa O.O., Shabanov A.V., Zyryanov V.Ya. // 22nd International LC Conference : Abstracts. - 2008. - Vol. 1. - P. 380

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; IInternational LC Conference(22 ; 2008 ; Jeju, Korea)
}
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18.

Inverse Regime of Ionic Modification of Surface Anchoring in Nematic Droplets / V. Y. Zyrvanov [et al.] // JETP Letters. - 2008. - Vol. 88, Is. 9. - P. 597-601, DOI 10.1134/S002136400821011X. - 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). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
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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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич
}
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19.

Small-Angle Light Scattering from Polymer-Dispersed Liquid-Crystal Films / V. A. Loiko [et al.] // J. Exp. Theor. Phys. - 2008. - Vol. 107, Is. 4. - P. 692-698, DOI 10.1134/S1063776108100178. - Cited References: 20 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
NEMATIC DROPLETS
Кл.слова (ненормированные):
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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Держатели документа:
[Loiko, V. A.
Konkolovich, A. V.
Misckevich, A. A.] Natl Acad Sci Belarus, BI Stepanov Phys Inst, Minsk 220072, Byelarus
[Maschke, U.] Univ Sci & Technol Lille, Lab Chim Macromol, F-59655 Villeneuve Dascq, France
[Zyryanov, V. Ya.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus
Laboratoire de Chimie Macromoleculaire, Universite des Sciences et Technologies de Lille, Villeneuve d'Ascq Cedex F-59655, France
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Loiko, V. A.; Maschke, U.; Zyryanov, V. Y.; Зырянов, Виктор Яковлевич; Konkolovich, A. V.; Misckevich, A. A.
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20.

    Температурно индуцированные изменения конфигурации директора в каплях нематика, диспергированного в поли- винилпирролидоне / Виталий С. Сутормин, Михаил Н. Крахалев, Оксана О. Прищепа // Журнал Сибирского федерального университета. Серия: Математика и физика. - 2009. - Т. 2, № 3. - С. 352-359 . - ISSN 1997-1397
   Перевод заглавия: Thermo-Induced Transformations of Director Configuration within Nematic Droplets Dispersed in Polyvinylpyrrolidone
Кл.слова (ненормированные):
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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Держатели документа:
Институт инженерной физики и радиоэлектроники, Сибирский федеральный университет
Институт физики им. Л.В. Киренского СО РАН
Сибирский государственный аэрокосмический университет

Доп.точки доступа:
Сутормин, Виталий С.; Крахалев, Михаил Н.; Прищепа, Оксана О.
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