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Polymer dispersed cholesteric liquid crystals with a toroidal director configuration under an electric field / A. P. Gardymova, M. N. Krakhalev, V. Ya. Zyryanov [et al.] // Polymers. - 2021. - Vol. 13, Is. 5. - Ст. 732. - P. 1-11, DOI 10.3390/polym13050732. - Cited References: 49. - This research was funded by Russian Science Foundation, Grant No. 20-72-10038 . - ISSN 2073-4360
Кл.слова (ненормированные):
cholesteric droplet -- orientational structure -- electric field -- polymer dispersted liquid crystal -- dichroic dye
Аннотация: The electro-optical properties of polymer dispersed liquid crystal (PDLC) films are highly dependent on the features of the contained liquid crystal (LC) droplets. Cholesteric LC droplets with homeotropic boundaries can form several topologically different orientational structures, including ones with single and more point defects, layer-like, and axisymmetric twisted toroidal structures. These structures are very sensitive to an applied electric field. In this work, we have demonstrated experimentally and by computer simulations that twisted toroidal droplets reveal strong structural response to the electric field. In turn, this leads to vivid changes in the optical texture in crossed polarizers. The response of droplets of different sizes were found to be equivalent in terms of dimensionless parameters. In addition, the explanation of this phenomenon showed a comparison of theoretical and experimental structural response curves aids to determine the shape of the droplet. Finally, we demonstrated that the addition of a dichroic dye allows such films to be used as optical filters with adjustable color even without polarizers.

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Держатели документа:
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russian Federation

Доп.точки доступа:
Gardymova, A. P.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Gruzdenko, A. A.; Alekseev, A. A.; Rudyak, V. Yu.
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Spin state crossover in Co3BO5 / N. V. Kazak, M. S. Platunov, Y. V. Knyazev [et al.] // Phys. Rev. B. - 2021. - Vol. 103, Is. 9. - Ст. 094445, DOI 10.1103/PhysRevB.103.094445. - Cited References: 71. - We acknowledge many inspirational discussions on the topic of this paper with the late Natalia Ivanova and Leonard Bezmaternykh. The authors acknowledge A. Ney for allowing us to use the XANES spectrum of film. We are grateful to the Russian Foundation for Basic Research (Project No. 20-02-00559) and President Council on Grants (Project No. МК-2339.2020.2) for supporting this paper. This paper was carried out within the state assignment of the Russian Ministry of Science and High Education via program “Quantum”' (No. AAAA-A18-118020190095-4). We also acknowledge support by Russian Ministry of Education and Science via Contract No. 02.A03.21.0006. We acknowledge financial support from the Spanish Ministry of Economy, Industry and Competitiveness (MINECO, Grant No. MAT2017-83468-R) and from the regional Government of Aragon (E12-20R RASMIA project) . - ISSN 2469-9950
Кл.слова (ненормированные):
Carbon dioxide -- Crystal structure -- Dichroism -- Energy gap -- Hydraulic structures -- Ions -- Iron compounds -- Magnetic moments -- Magnetic susceptibility -- Single crystals -- DC magnetic susceptibility -- Effective magnetic moments -- Electronic configuration -- Generalized gradient approximations -- Magnetic sublattices -- Octahedral environment -- Paramagnetic susceptibility -- X-ray magnetic circular dichroism -- Cobalt
Аннотация: We have investigated the spin and oxidation states of Co in Co3BO5 using x-ray magnetic circular dichroism (XMCD) and dc magnetic susceptibility measurements. At low temperatures, XMCD experiments have been performed at the Co K-edge in Co3BO5 and Co2FeBO5 single crystals in the fully ferrimagnetically ordered phase. The Co (K-edge) XMCD signal is found to be related to the Co2+ magnetic sublattices in both compounds, providing strong experimental support for the low-spin (LS) Co3+ scenario. The paramagnetic susceptibility is highly anisotropic. An estimation of the effective magnetic moment in the temperature range 100–250 K correlates well with two Co2+ ions in the high-spin (HS) state and some orbital contribution, while Co3+ remains in the LS state. The crystal structure of the Co3BO5 single crystal has been solved in detail at the T range 296–703 K. The unit cell parameters and volume show anomalies at 500 and 700 K. The octahedral environment of the Co4 site strongly changes with heating. The generalized gradient approximation with Hubbard U correction calculations have revealed that, at low-temperatures, the system is insulating with a band gap of 1.4 eV, and the Co2+ ions are in the HS state, while Co3+ are in the LS state. At high temperatures (T > 700 K), the charge ordering disappears, and the system becomes metallic with all Co ions in 3d7 electronic configuration and HS state.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
M.N. Miheev Institute of Metal Physics UB RAS, Ekaterinburg, 620137, Russian Federation
Ural Federal University, Ekaterinburg, 620002, Russian Federation
Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Zaragoza, 50009, Spain
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
P.N. Lebedev Physical Institute of RAS, Moscow, 119991, Russian Federation
ESRF-The European Synchrotron, 71 Avenue des Martyrs CS40220, Grenoble Cedex 9, F-38043, France

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Pchelkina, Z. V.; Gapontsev, V. V.; Streltsov, S. V.; Bartolome, J.; Arauzo, A.; Yumashev, V. V.; Gavrilkin, S. Y.; Wilhelm, F.; Rogalev, A.
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Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge / A. S. Sukhanov [et al.] // Phys. Rev. B. - 2019. - Vol. 99, Is. 21. - Ст. 214445, DOI 10.1103/PhysRevB.99.214445. - Cited References: 53. - We thank S. E. Nikitin for many stimulating discussions. A.S.S. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Work at the TU Dresden was funded by the German Research Foundation (DFG) through projects B05 and C03 of the Collaborative Research Center SFB 1143 (project i.d. 247310070), Wurzburg-Dresden Cluster of Excellence ct.qmat (EXC 2147; project i.d. 39085490), and Priority Program SPP 2137 "Skyrmionics." . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics,
Рубрики:
TRIANGULAR SPIN CONFIGURATION
WEAK FERROMAGNETISM
MN3SN
Аннотация: We present detailed inelastic neutron scattering measurements of the noncollinear antiferromagnet Mn3Ge. Time-of-flight and triple-axis spectroscopy experiments were conducted at the temperature of 6 K, well below the high magnetic ordering temperature of 370 K. The magnetic excitations have a 5-meV gap and display an anisotropic dispersive mode reaching ~ 90 meV at the boundaries of the magnetic Brillouin zone. The spectrum at the zone center shows two additional excitations that demonstrate characteristics of both magnons and phonons. Ab initio lattice-dynamics calculations show that these can be associated with the magnon-polaron modes resulting from the hybridization of the spin fluctuations and the low-energy optical phonons. The observed magnetoelastic coupling agrees with the previously found negative thermal expansion in this compound and resembles the features reported in the spectroscopic studies of other antiferromagnets with similar noncollinear spin structures.

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Держатели документа:
Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany.
Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, Germany.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Univ Paris Saclay, CEA Saclay, CNRS, Lab Leon Brillouin,CEA, F-91191 Gif Sur Yvette, France.
Rutherford Appleton Lab, STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England.

Доп.точки доступа:
Sukhanov, A. S.; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Bourges, P.h.; Walker, H. C.; Manna, K.; Felser, C.; Inosov, D. S.; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM); German Research Foundation (DFG) through project B05 of the Collaborative Research Center [SFB 1143, 247310070]; German Research Foundation (DFG) through project C03 of the Collaborative Research Center [SFB 1143, 247310070]; German Research Foundation (DFG) through Wurzburg-Dresden Cluster of Excellence ct.qmat [EXC 2147, 39085490]; German Research Foundation (DFG) [SPP 2137]
}
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    Toroidal Configuration of a Cholesteric Liquid Crystal in Droplets with Homeotropic Anchoring / M. N. Krakhalev [et al.] // JETP Letters. - 2019. - Vol. 109, Is. 7. - P. 478-481, DOI 10.1134/S0021364019070075. - Cited References: 30. - This work was supported by the Russian Science Foundation (project no. 18-72-10036). The work was performed using the equipment of the Shared Usage Center of High-Capacity Computational Resources, Moscow State University, supported by the Ministry of Education and Science of the Russian Federation (project no. RFMEFI62117X0011). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
NEMATIC DROPLETS
   SURFACE
Аннотация: Orientational structures formed in cholesteric droplets with homeotropic surface anchoring have been studied by means of polarization optical microscopy and computer simulations. It has been found that, when the ratio of the size of droplets to the pitch of a cholesteric helix ranges from 1.4 to 2.9, an axisymmetric toroidal cholesteric structure is formed with a topological linear defect in the form of an equatorially located surface ring. The features of the toroidal structure in cholesteric droplets and their optical textures for various observation schemes are examined in detail.

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Публикация на русском языке Тороидальная конфигурация холестерика в каплях с гомеотропным сцеплением [Текст] / М. Н. Крахалев [и др.] // Письма в ЖЭТФ. - 2019. - Т. 109 Вып. 7-8. - С. 487-491

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Rudyak, V. Yu.; Gardymova, A. P.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Science Foundation [18-72-10036]; Ministry of Education and Science of the Russian Federation [RFMEFI62117X0011]
}
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    Nematic and Cholesteric Liquid Crystal Structures in Cells with Tangential-Conical Boundary Conditions / M. N. Krakhalev [et al.] // Crystals. - 2019. - Vol. 9, Is. 5. - Ст. 249, DOI 10.3390/cryst9050249. - Cited References: 43. - This work was supported by the Russian Science Foundation (No. 18-72-10036). . - ISSN 2073-4352
   Перевод заглавия: Структуры нематика и холестерика в ячейках с тангенциально-коническими граничными условиями

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
TRANSITION
GRATINGS
Кл.слова (ненормированные):
liquid crystal -- cholesteric -- nematic -- conical boundary conditions -- orientational structure -- director configuration -- topological defect
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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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Russian Science Foundation [18-72-10036]
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    Magnesium Boride Nanotubes: Relative Stability and Atomic and Electronic Structure / P. B. Sorokin [et al.] // J. Phys. Chem. C. - 2010. - Vol. 114, Is. 11. - P. 4852-4856, DOI 10.1021/jp9112014. - Cited Reference Count: 38. - Гранты: P.B.S. and B.I.Y. acknowledge support by the Basic Energy Sciences division of the Department of Energy, award DE-SC0001479. L.A.C. was supported by the Russian Academy of Sciences, program No. 21. P.V.A ad P.B.S. also acknowledge the collaborative RFBR-JSPS grant No. 09-02-92107-R Phi. We are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences for the possibility of using a cluster computer for quantum chemical calculations. The geometry of all presented structures was visualized by commercial ChemCraft software (http://www.chemcraftprog.com). - Финансирующая организация: Basic Energy Sciences division of the Department of Energy [DE-SC0001479]; Russian Academy of Sciences [21]; RFBR-JSPS [09-02-92107-RPhi] . - MAR 25. - ISSN 1932-7447
Рубрики:
BORON
   PSEUDOPOTENTIALS
   FULLERENES
   SIMULATION
   FORM
Кл.слова (ненормированные):
Basic composition -- Bending behavior -- Comparative studies -- Diborides -- Energy analysis -- Energy minima -- Magnesium atom -- Magnesium boride -- MgB2 -- Relative stabilities -- Semiconducting behavior -- Small-diameter -- Staggered configuration -- Sub-lattices -- Bending (forming) -- Borides -- Boron -- Electronic properties -- Electronic structure -- Energy management -- Magnesium -- Nanotubes -- Density functional theory
Аннотация: A comparative study of file energies and the electronic structure of MgBx nanotubes is performed within the framework of the density functional theory. Different basic compositions (x = 2 for diboride and x = 3 for triboride) and different diameters (3 angstrom < D < 18 angstrom), as well the exterior, interior, and staggered placement of magnesium atoms, are considered. Energy analysis reveals a nontrivial bending behavior of the MgB2 sheets. such that the tubes with exterior and staggered configurations display the energy minima at certain small diameters (of the boron cage sublattice). The semiconducting behavior of narrow MgB2 nanotubes with exterior Mg position was observed.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77251 USA
Rice Univ, Dept Chem, Houston, TX 77251 USA
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Sorokin, P. B.; Avramov, P.V.; Yakobson, B.I.; Chernozatonskii, L.A.
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    Ориентационный переход в слое нематика с гомеотропно-коническими граничными условиями, индуцированный ионной модификацией поверхностного сцепления / В. С. Сутормин, М. Н. Крахалев, О. О. Прищепа, В. Я. Зырянов // Жидк. крист. и их практич. использ. - 2022. - Т. 22, № 3. - С. 105-110 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2022.3.105. - Библиогр.: 4. - В.С. Сутормин, М.Н. Крахалев и О.О. Прищепа благодарят за поддержку грант РФФИ, Правительства Красноярского края и Красноярского краевого фонда науки в рамках научного проекта № 20-42-240007 . - ISSN 1991-3966. - ISSN 2499-9644
   Перевод заглавия: Orientational transition in nematic layer with homeotropic-conical boundary conditions induced by ionic modification of surface anchoring
Кл.слова (ненормированные):
нематик -- ионный сурфактант -- поверхностное сцепление -- конические граничные условия -- конфигурация директора -- оптическая текстура -- nematic -- ionic surfactant -- surface anchoring -- conical boundary conditions -- director configuration -- optical texture
Аннотация: Исследована трансформация ориентационной структуры в слое нематика с гомеотропно-коническими граничными условиями, индуцированная электроуправляемой ионной модификацией поверхностного сцепления. Обнаружено, что изменение азимутального угла директора на подложке с коническим сцеплением возможно осуществить путем модификации граничных условий на второй подложке.
The transformation of the orientational structure induced by the electrically controlled ionic modification of surface anchoring in the nematic layer with homeotropic-conical boundary conditions has been considered. It has been found that the change in the azimuthal angle of director at the substrate with conical anchoring can be realized by modification of boundary conditions at the second substrate.

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Держатели документа:
Институт физики им. Л. В. Киренского, ФИЦ КНЦ СО РАН, Красноярск, Россия
Институт инженерной физики и радиоэлектроники, Сибирский федеральный университет, Красноярск, Россия

Доп.точки доступа:
Сутормин, Виталий Сергеевич; Sutormin, V. S.; Крахалев, Михаил Николаевич; Krakhalev, M. N.; Прищепа, Оксана Олеговна; Prishchepa, O. O.; Зырянов, Виктор Яковлевич; Zyryanov, V. Ya.

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    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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Crystal structure, absolute configuration and characteristic temperatures of SmFe3(BO3)4 in the temperature range 11-400 K / E. S. Smirnova, O. A. Alekseeva, A. P. Dudka [et al.] // Acta Crystallogr. B. - 2022. - Vol. 78, Is. 3-2, Pt. 1. - P. 546-556, DOI 10.1107/S2052520622003948. - Cited References: 43. - The authors are grateful to D. Yu. Chernyshov (SNBL, ESRF, Grenoble) for assistance in obtaining the experimental data. This work was performed using the equipment of the Shared Research Center FSRC ‘Crystallography and Photonics’ RAS supported by the Russian Ministry of Science and Higher Education. This work was supported by the Ministry of Science and Higher Education within the State assignment FSRC ‘Crystallography and Photonics’ RAS . - ISSN 2052-5206
Кл.слова (ненормированные):
samarium bismuth iron borate -- absolute configuration -- crystal structure -- multi-temperature single-crystal X-ray diffraction -- Mossbauer spectroscopy -- characteristic temperatures -- solution-melt growth
Аннотация: The crystal structure of samarium iron borate was analyzed with regard to growth conditions and temperature. The inclusion of about 7% Bi atoms in the crystals grown using the Bi2Mo3O12-based flux was discovered and there were no impurities in the crystals grown using the Li2WO4-based flux. No pronounced structural features associated with Bi inclusion were observed. The different absolute configurations of the samples grown using both fluxes were demonstrated. Below 80 K, a negative thermal expansion of the c unit-cell parameter was found. The structure of (Sm0.93Bi0.07)Fe3(BO3)4 belongs to the trigonal space group R32 in the temperature range 90–400 K. A decrease in the (Sm,Bi)—O, Sm—B, Sm—Fe, Fe—O, Fe—B and Fe—Fe distances is observed with a lowering of the temperature, B1—O does not change, B2—O increases slightly and the B2O3 triangles deviate from the ab plane. The strongest decrease in the equivalent isotropic atomic displacement parameters (Ueq) with decreasing temperature is observed for atoms Sm and O2, and the weakest is observed for B1. The O2 atoms have the highest Ueq values, the most elongated atomic displacement ellipsoids of all the atoms and the smallest number of allowed vibrational modes of all the O atoms. The largest number of allowed vibrational modes and the strongest interactions with neighbouring atoms is seen for the B atoms, and the opposite is seen for the Sm atoms. The quadrupole splitting Δ(T) of the paramagnetic Mössbauer spectra increases linearly with cooling. The Néel temperature [TN = 31.93 (5) K] was determined from the temperature dependence of the hyperfine magnetic field Bhf(T), which has a non-Brillouin character. The easy-plane long-range magnetic ordering below TN was confirmed.

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Держатели документа:
Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics', Russian Academy of SciencesMoscow 119333, Russian Federation
Moscow State University, Faculty of GeologyMoscow 119991, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Smirnova, E. S.; Alekseeva, O. A.; Dudka, A. P.; Sorokin, T. A.; Khmelenin, D. N.; Yapaskurt, V. O.; Lyubutina, M. V.; Frolov, K. V.; Lyubutin, I. S.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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10.

    Bipolar-homogeneous structural phase transition in nematic droplets formed in the polymer matrix in a magnetic field / A. M. Parshin [et al.] // Crystallogr. Rep. - 2009. - Vol. 54, Is. 7. - P1191-1196, DOI 10.1134/S1063774509070098. - 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] . - DEC. - ISSN 1063-7745
Рубрики:
DISPERSED LIQUID-CRYSTALS
   FRANK CONSTANTS
   ALIGNMENT
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Parshin, A. M.; Паршин, Александр Михайлович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович; Nazarov, V. G.
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