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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Nazarov V. G., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Magnetic-field-induced structural transition in polymer-dispersed liquid crystals
Место публикации : Mol. Cryst. Liquid Cryst. - 2012. - Vol. 557, Is. 1. - P.50-59. - ISSN 1542-1406, DOI 10.1080/15421406.2011.632237
Примечания : Cited References: 19. - This study was supported by the Presidium of the Russian Academy of Sciences (Project no. 24.1) and the Siberian Branch of the Russian Academy of Sciences (grant no. 43).
Предметные рубрики: FRANK CONSTANTS
ELECTRIC-FIELD
NEMATIC DROPS
ANISOTROPY
ALIGNMENT
FILMS
ORDER
Ключевые слова (''Своб.индексиров.''): anchoring energy--magnetic field--polymer-dispersed liquid crystals--structural transition--temperature fluctuations
Аннотация: The structural transition occurring in droplets of nematic liquid crystals formed in a polymer in magnetic field is studied. The transition is caused by field-driven weakening of tangential surface anchoring and develops following two scenarios: bipolar structure/homogeneous structure or bipolar structure/radial structure. The first scenario suggests a cyclic transition occurring upon thermal fluctuations without field. The structural transition is considered within a model of the biaxial liquid crystal/polymer interface. The model describes tendency of the nematic director to align tangentially on a droplet's surface, normally under the action of flexoelectric polarization, and axially along the magnetic-field-imposed easy orientation axis.
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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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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) : Shabanov A. V., Presnyakov V. V., Zyryanov V. Y., Vetrov S. Y.
Заглавие : Characteristics of the process of reorientation of bipolar drops of a nematic with rigidly fixed poles
Место публикации : JETP Letters. - 1998. - Vol. 67, Is. 9. - P.733-737. - ISSN 0021-3640, DOI 10.1134/1.567739
Примечания : Cited References: 9
Аннотация: The director configuration in a bipolar drop of a nematic with rigidly fixed poles is calculated as a function of the electric field directed perpendicular to the symmetry axis of the drop. It is shown that the reorientation of the drop is a dual process: a threshold process in the region where the initial director orientation is orthogonal to the electric field, and a nonthreshold process elsewhere in the drop. A relation for determining the critical field is obtained. Experimental investigations of the characteristics of scattered light for a film of polymer-encapsulated liquid crystals confirm the computational results. (C) 1998 American Institute of Physics. [S0021-3640(98)01709-5].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zyryanov V. Y., Presnyakov V. V., Shabanov V. F.
Заглавие : Frederix effect in polymer-capsulated nematic drops
Место публикации : Pisma Zhurnal Tek. Fiz.: MEZHDUNARODNAYA KNIGA, 1996. - Vol. 22, Is. 14. - P22-26. - ISSN 0320-0116
Примечания : Cited References: 6
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Zyryanov V. Ya., Miskevich A. A.
Заглавие : Polarization of light by a polymer film containing elongated drops of liquid crystal with inhomogeneous interfacial anchoring
Место публикации : Opt. Spectrosc.: Maik Nauka-Interperiodica Publishing, 2017. - Vol. 122, Is. 6. - P.984-994. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X1706011X
Примечания : Cited References: 26
Ключевые слова (''Своб.индексиров.''): crystal orientation--crystal structure--drops--inverse problems--liquid crystals--liquids--polarization--polymer films--polymers--refractive index--semiconducting films--surface active agents--anomalous diffraction approximations--comparative analysis--degree of polarization--free energy density--internal structure--mechanical model--spectral polarization--transmitted light--optical films
Аннотация: An optico-mechanical model describing the coherent (directed) transmittance and the degree of polarization of forward-transmitted light by a polymer film with elongated liquid-crystal (LC) drops has been developed. This model, based on the Foldy–Twersky and anomalous-diffraction approximations, makes it possible to analyze the optical response of a film under extension as a function of the film thickness, refractive index of the polymer, the sizes and anisometry parameters of liquid-crystal drops, their concentration, internal structure, polydispersity, and orientation of optical axes. The model is verified based on the comparison of numerical and experimental data for the inverse modification of interfacial anchoring by an ion-forming surfactant. The internal drop structure is determined by solving the problem of minimizing the volume free energy density. A comparative analysis of the calculated transmittance and degree of polarization for films with uniform homeotropic and modified inhomogeneous interfacial anchoring is performed. The spectral polarization characteristics of a film with elongated LC drops and single-domain internal structure, formed under mechanical extension with the aid of surfactants, are investigated. © 2017, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chzhan A. V., Podorozhnyak S. A., Zharkov S. M., Gromilov S. A., Patrin G. S.
Заглавие : Induced magnetic anisotropy of Co-P thin films obtained by electroless deposition
Место публикации : J. Magn. Magn. Mater. - 2021. - Vol. 537. - Ст.168129. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2021.168129
Примечания : Cited References: 28. - The work is partially supported by the RFBR Foundation (10-02-00161-a project). The study has been carried out within the framework of the state task of the Ministry of science and higher education of the Russian Federation (topic No. FSRZ-2020-0011)
Аннотация: Co1−x-Px films (x = 0.02–0.05) deposited on cover glass by electroless plating from aqueous solutions in a continuous magnetic field with the strength of 2.5 kOe are presented. It has been found that in the pH range from 7.2 to 9.3, two special areas can be distinguished, they are characterized by the deposition of films with qualitatively different parameters in them. So, the change of the pH of working solutions from 7.2 to 8.7 causes the increase in the value of the induced magnetic anisotropy constant KU from 2.5 × 105 erg/cm3 to 6 × 105 erg/cm3. If the value of the hydrogen index is still increasing, an uneven drop to 5 × 104 erg/cm3 is observed. In the same way, the coercivity HC changes; at first it grows from 700 Oe to 1.5 kOe, and then it drops to Oe units. The concentration of phosphorus in the range of 7.2 to 8.7 increases linearly from 2 to 3 wt%, and in the range of 8.7 to 9.3, it increases from 3 to 5 wt%. The x-ray diffraction data show that the samples obtained at pH8.7 are characterized by the presence of the hcp phase of Co (α-Co). The observed reflections of films obtained at pH 8.7 indicate the fcc-Co (β-Co) with the diffraction peak blurring: the greater the pH value of the samples obtained, the more the diffraction peak blurring. It is shown that the induced magnetic anisotropy in high-coercivity films relates to the modification of the Co lattice. The lattice passes from a distorted fcc to an hcp structure during the growth of crystallites in a magnetic field. The induced magnetic anisotropy appears in films that were obtained in the high pH field due to the ordering of magnetic ions pairs.
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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 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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