Papers by Alexey Bobrovsky
Journal of Materials Chemistry C, 2023
2D diffraction gratings were prepared by polymerization-induced fixation of electrohydrodynamic c... more 2D diffraction gratings were prepared by polymerization-induced fixation of electrohydrodynamic convection patterns in a nematic mixture. Photo- and electro-optical tuning of their diffraction efficiency was demonstrated.
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Journal of Molecular Liquids, Aug 1, 2023
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Polymers, Mar 8, 2023
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Journal of Molecular Liquids, Nov 1, 2021
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Journal of Polymer Science Part B, May 10, 2019
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Liquid Crystals, Oct 16, 2018
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Macromolecular Chemistry and Physics, May 23, 2017
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ChemPhysChem, Mar 23, 2023
Stimuli responsive liquid crystalline polymers are a unique class of so‐called “smart” materials ... more Stimuli responsive liquid crystalline polymers are a unique class of so‐called “smart” materials demonstrating various types of mesomorphic structures easily controlled by external fields, including light. In the present work we synthesized and studied a comb‐shaped hydrazone‐containing copolyacrylate exhibited cholesteric liquid crystalline properties with the pitch length of the helix being tuned under irradiation with light. In the cholesteric phase selective light reflection in the near IR spectral range (1650 nm) was measured and a large blue shift of the reflection peak from 1650 nm to 500 nm was found under blue light (428 or 457 nm) irradiation. This shift is related to the Z‐E isomerization of photochromic hydrazone‐containing groups and it is photochemically reversible. The improved and faster photo‐optical response was found after copolymer doping with 10 wt % of low‐molar‐mass liquid crystal. It is noteworthy that both, the E and Z isomers of hydrazone photochromic group are thermally stable that enable to achieve a pure photoinduced switch without any dark relaxation at any temperatures. The large photoinduced shift of the selective light reflection, together with thermal bistability, makes such systems promising for applications in photonics.
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Technical Physics Letters, May 1, 2016
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Advanced Optical Materials, Nov 1, 2020
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Liquid Crystals, Jan 5, 2023
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Židkie kristally i ih praktičeskoe ispolʹzovanie, Sep 30, 2021
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Židkie kristally i ih praktičeskoe ispolʹzovanie, Mar 26, 2020
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Journal of Alloys and Compounds, Nov 1, 2022
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Polymer, Jul 1, 2023
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Liquid Crystals, Sep 3, 2019
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Macromolecular Materials and Engineering, Aug 13, 2021
Among the various types of liquid crystalline (LC) structures, the cholesteric mesophase attracts... more Among the various types of liquid crystalline (LC) structures, the cholesteric mesophase attracts special attention in view of helical supramolecular structure determining their specific optical properties. The helix pitch of cholesteric liquid crystals is very sensitive to mechanical stress, resulting in change of their optical properties and position of selective light reflection peak. Here, films of polymer‐dispersed cholesteric liquid crystals based on polyurethane elastomer are prepared and studied. Liquid crystal mixtures based on chiral cholesterol derivatives are uniformly dispersed in the form of micrometer‐sized droplets in an elastomeric matrix. A significant mechano‐optical response of the composites under the action of deformation is demonstrated, and the change in the position of the selective light reflection band during mechanical stress is studied in detail. A shift in the selective light reflection peak by 100 nm or more is found. This process is accompanied by color transformations of brightly colored films. Such materials can be promising for creating stress and deformation sensors, ripple and bending sensors, and other technical devices.
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arXiv (Cornell University), Dec 8, 2021
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ACS applied polymer materials, Sep 5, 2022
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Papers by Alexey Bobrovsky