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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak, Vladimir Yu., Prishchepa O. O., Gardymova, Anna P., Emelyanenko, Alexander V., Liu, Jui-Hsiang, Zyryanov V. Ya.
Заглавие : Orientational structures in cholesteric droplets with homeotropic surface anchoring
Коллективы : Russian Foundation for Basic Research Project [19-53-52011 MNT_a, RFMEFI62117X0011]
Место публикации : Soft Matter. - 2019. - Vol. 15, Is. 28. - P.5554-5561. - ISSN 1744-683X, DOI 10.1039/c9sm00384c. - ISSN 1744-6848(eISSN)
Примечания : Cited References: 67. - This work was supported by the Russian Foundation for Basic Research Project No. 19-53-52011 MNT_a. The research is carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University supported by the project RFMEFI62117X0011.
Предметные рубрики: LIQUID-CRYSTAL DROPLETS
TOPOLOGICAL DEFECTS
NEMATIC DROPLETS
Аннотация: The dependency of orientational structures in cholesteric droplets with homeotropic surface anchoring on the helicity parameter has been studied by experiment and simulations. We have observed a sequence of structures, in which the director configurations and topological defects were identified by comparison of polarized microscopy pictures with simulated textures. A toron-like and low-symmetry intermediate layer-like structures have been revealed and studied in detail. The ranges of stability of the observed structures have been summarized in a general diagram and explained by the helicity parameter dependence of the free energy terms.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gardymova, Anna P., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Optical textures and orientational structures in cholesteric droplets with conical boundary conditions
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-72-10036]
Место публикации : Molecules. - 2020. - Vol. 25, Is. 7. - Ст.1740. - ISSN 1420-3049(eISSN), DOI 10.3390/molecules25071740
Примечания : Cited References: 53. - The authors are grateful for the financial support by the Russian Science Foundation (grant No. 18-72-10036).
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
CHIRAL NEMATIC DROPLETS
IONIC MODIFICATION
Аннотация: Cholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet’s equator is formed at the relative chirality parameter N0≤2.9 . The intermediate director configuration with the deformed circular defect is realised at 2.9N03.95 , and the layer-like structure with the twisted surface defect loop is observed at N0≥3.95 . The cholesteric layers in the layer-like structure are slightly distorted although the cholesteric helix is untwisted.
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