Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.92
N. Usol'tseva
{"title":"Anniversary of prof. V. P. Shibaev","authors":"N. Usol'tseva","doi":"10.18083/lcappl.2021.3.92","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.92","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44892540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.6
V. Kozenkov, V. Belyaev, D. Chausov
The review of patents and scientific papers presents technology and properties of thin film (of few µm thickness) linear and circular polarizers as well as patterned optical polarization structures based on different physical effects (absorption dichroism, anisotropic luminescence, birefringence, reflection and scattering). Vari-ous substances are used for this purpose: lyotropic and thermotropic liquid crystals, photoanisotropic materials, anisotropic scattering or anisotropic fluorescent materials and other media. The greatest interest from the practical application point of view for displays and elements for information protection are polarizers and patterned structures based on lyotropic liquid crystals as well as photoanisotropic materials based on photochemically stable substances and anisotropic luminescence media.
{"title":"Thin Film Polarizers Based on Lyotropic Liquid Crystals and Photoanisotropic Materials: Properties and Technologies","authors":"V. Kozenkov, V. Belyaev, D. Chausov","doi":"10.18083/lcappl.2021.3.6","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.6","url":null,"abstract":"The review of patents and scientific papers presents technology and properties of thin film (of few µm thickness) linear and circular polarizers as well as patterned optical polarization structures based on different physical effects (absorption dichroism, anisotropic luminescence, birefringence, reflection and scattering). Vari-ous substances are used for this purpose: lyotropic and thermotropic liquid crystals, photoanisotropic materials, anisotropic scattering or anisotropic fluorescent materials and other media. The greatest interest from the practical application point of view for displays and elements for information protection are polarizers and patterned structures based on lyotropic liquid crystals as well as photoanisotropic materials based on photochemically stable substances and anisotropic luminescence media.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44327918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.76
K. Nikitin, Yu. V. Polenov, A. Kazak, E. V. Egorova
Floating layers of N,N'-di(3,5-dimethylphenyl)diimide of 1,1'-binaphthyl-4,4',5,5',8,8'-hexacarboxylic acid (bis(3,5-(CH 3 ) 2 Ph)Cub) and Langmuir-Schaefer films of this compound on quartz and silicon substrates were ob-tained. By means of electron absorption spectroscopy it was found that only H-type aggregates contained in the film structure. The average size of the aggregates was determined using atomic force microscopy. It is shown that thiourea dioxide does not change the structure of the studied film, in contrast to its previously studied effect on the film formed by N,N'-di(4-chlorophenyl)diimide of 1,1'-binaphthyl-4,4',5,5',8,8'-hexacarboxylic acid containing aggregates of two types: J and H.
{"title":"Supramolecular Organization and Optical Properties of Langmuir-Schaefer Films of N,N'-di(3,5-Dimethylphenyl)diimide 1,1'-Binaphthyl-4,4',5,5',8,8'-Hexacarboxylic Acid","authors":"K. Nikitin, Yu. V. Polenov, A. Kazak, E. V. Egorova","doi":"10.18083/lcappl.2021.3.76","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.76","url":null,"abstract":"Floating layers of N,N'-di(3,5-dimethylphenyl)diimide of 1,1'-binaphthyl-4,4',5,5',8,8'-hexacarboxylic acid (bis(3,5-(CH 3 ) 2 Ph)Cub) and Langmuir-Schaefer films of this compound on quartz and silicon substrates were ob-tained. By means of electron absorption spectroscopy it was found that only H-type aggregates contained in the film structure. The average size of the aggregates was determined using atomic force microscopy. It is shown that thiourea dioxide does not change the structure of the studied film, in contrast to its previously studied effect on the film formed by N,N'-di(4-chlorophenyl)diimide of 1,1'-binaphthyl-4,4',5,5',8,8'-hexacarboxylic acid containing aggregates of two types: J and H.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48151033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.68
E. M. Aver’yanov
The additivity relations, which connect the optical parameters of an uniaxial liquid-crystalline mixture in the transparency region [refractive indices n j for the light polarized along (j = || ) or across (j = ) optical axis, n = n || – n , n = (n || + 2n )/3, m =(n || 2 + 2n 2 )/3, n m = m1/2 ] with similar values of pristine liquid-crystalline com-ponents constituting the mixture, were obtained. To derive the additivity relations, for the mixture and its individ-ual components, a microscopic approach was used, taking into account the anisotropy of the local field of light wave. All additivity relations for the nematic mixture of para-azoxyanisole with para-azoxyphenetole obtained in a broad range of mesophase temperatures and light-wave wavelengths were confirmed with high accuracy.
{"title":"Additive Optical Properties of Uniaxial Liquid-Crystalline Mixture","authors":"E. M. Aver’yanov","doi":"10.18083/lcappl.2021.3.68","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.68","url":null,"abstract":"The additivity relations, which connect the optical parameters of an uniaxial liquid-crystalline mixture in the transparency region [refractive indices n j for the light polarized along (j = || ) or across (j = ) optical axis, n = n || – n , n = (n || + 2n )/3, m =(n || 2 + 2n 2 )/3, n m = m1/2 ] with similar values of pristine liquid-crystalline com-ponents constituting the mixture, were obtained. To derive the additivity relations, for the mixture and its individ-ual components, a microscopic approach was used, taking into account the anisotropy of the local field of light wave. All additivity relations for the nematic mixture of para-azoxyanisole with para-azoxyphenetole obtained in a broad range of mesophase temperatures and light-wave wavelengths were confirmed with high accuracy.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42426533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.32
M. E. Karyakin, A. Krupin, A. Knyazev, Y. Galyametdinov
) and the conducting poly(9,9-di-n-octylflu-orenyl-2,7-diyl) polymer (PFO) were obtained. It was found that the resulting mixtures with a continuous solid solution belong to isomorphic systems of the Rozeboom type I and exhibit nematic mesomorphism at any ratio of components. Upon cooling to room temperature, the LC mixtures were vitrified with the preservation of the me-sophase packing. Using the orienting substrates, a planar-oriented film material based on an LC mixture containing 10 mol. % of PFO and 90 mol. % of the Eu(CPDk 3-5 ) 3 Bpy 17-17 complex was created. The dichroic ratio of photoluminescence R (it is the ratio of the luminescence intensities at 0º and 90º) of the obtained material is 5.4 at a ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ wavelength of 438 nm and 3.2 at a wavelength of 613 nm. It was found that the obtained film materials are capable of changing the luminescence color from light red to dark blue, depending on the UV irradiation wavelength or upon changing the angle between the polarizer plane and the molecular orientation direction. Thus, the possibility of obtaining oriented films of lanthanide-containing liquid-crystal mixtures with controlled polarization and luminescence color has been shown.
{"title":"Nematic Mixtures with Controlled Polarized Luminescence Based on (9,9-Di-n-octylfluorenyl-2,7-diyl) Polymer and Lanthanidomesogen","authors":"M. E. Karyakin, A. Krupin, A. Knyazev, Y. Galyametdinov","doi":"10.18083/lcappl.2021.3.32","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.32","url":null,"abstract":") and the conducting poly(9,9-di-n-octylflu-orenyl-2,7-diyl) polymer (PFO) were obtained. It was found that the resulting mixtures with a continuous solid solution belong to isomorphic systems of the Rozeboom type I and exhibit nematic mesomorphism at any ratio of components. Upon cooling to room temperature, the LC mixtures were vitrified with the preservation of the me-sophase packing. Using the orienting substrates, a planar-oriented film material based on an LC mixture containing 10 mol. % of PFO and 90 mol. % of the Eu(CPDk 3-5 ) 3 Bpy 17-17 complex was created. The dichroic ratio of photoluminescence R (it is the ratio of the luminescence intensities at 0º and 90º) of the obtained material is 5.4 at a ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ wavelength of 438 nm and 3.2 at a wavelength of 613 nm. It was found that the obtained film materials are capable of changing the luminescence color from light red to dark blue, depending on the UV irradiation wavelength or upon changing the angle between the polarizer plane and the molecular orientation direction. Thus, the possibility of obtaining oriented films of lanthanide-containing liquid-crystal mixtures with controlled polarization and luminescence color has been shown.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47939204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.45
A. A. Novikov, D. Makarov
The dynamics of the helical orientation structure of a ferrocholesteric liquid crystal under the action of a rotating magnetic field at soft (finite) coupling between magnetic particles and a liquid crystal matrix is theoreti-cally studied. The stationary regime of rotation of ferrocholesteric helix in the uniform magnetic field is analyzed. A system of integro-differential equations defining the orientation of liquid crystalline and magnetic subsystems and the critical parameters at the ferrocholesteric – ferronematic transition point with a finite coupling energy is obtained in the continuum theory. The orientation phase diagram of the ferrocholesteric – ferronematic transition at different values of the magnetic field strength and angular rotation velocity, coupling energy and magnetic field influence parameter is obtained for the stationary regime of rotation. It is shown that the critical threshold of the ferrocholesteric – ferronematic transition decreases as the coupling energy and the field influence parameter increase. The helix unwinding in the dipole mode is the most effective, as in the static case.
{"title":"Soft Ferrocholesteric in a Rotating Magnetic Field: Phase Diagrams","authors":"A. A. Novikov, D. Makarov","doi":"10.18083/lcappl.2021.3.45","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.45","url":null,"abstract":"The dynamics of the helical orientation structure of a ferrocholesteric liquid crystal under the action of a rotating magnetic field at soft (finite) coupling between magnetic particles and a liquid crystal matrix is theoreti-cally studied. The stationary regime of rotation of ferrocholesteric helix in the uniform magnetic field is analyzed. A system of integro-differential equations defining the orientation of liquid crystalline and magnetic subsystems and the critical parameters at the ferrocholesteric – ferronematic transition point with a finite coupling energy is obtained in the continuum theory. The orientation phase diagram of the ferrocholesteric – ferronematic transition at different values of the magnetic field strength and angular rotation velocity, coupling energy and magnetic field influence parameter is obtained for the stationary regime of rotation. It is shown that the critical threshold of the ferrocholesteric – ferronematic transition decreases as the coupling energy and the field influence parameter increase. The helix unwinding in the dipole mode is the most effective, as in the static case.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49180413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.39
D. Shmeliova, S. Pasechnik, S. S. Kharlamov, A. Saidgaziev, V. Podolsky
The work is devoted to the experimental studies of electrokinetic phenomena in oriented samples of a nematic liquid crystal (LC) 5CB, formed inside flat capillaries with a homeotropic surface orientation. A decay flow of the liquid crystal arising under the action of DC electric field and hydrostatic pressure gradient was experimentally realized and studied by the registration of meniscus’ motion in the vertically oriented cylindrical capillary. The dependences of the maximal value of the meniscus’ rise and characteristic decay time on the control voltage have been obtained. The analysis of the experimental data was performed in the framework of a simple model, taking into account the dependence of dielectric permittivity on the electrically controlled orientation of LC. The value of zeta potential as well as the effective shear viscosities at different voltages were determined. The obtained data were compared with the results of independent studies.
{"title":"Electrokinetic Phenomena in Homeotropic Layers of Nematic Liquid Crystal","authors":"D. Shmeliova, S. Pasechnik, S. S. Kharlamov, A. Saidgaziev, V. Podolsky","doi":"10.18083/lcappl.2021.3.39","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.39","url":null,"abstract":"The work is devoted to the experimental studies of electrokinetic phenomena in oriented samples of a nematic liquid crystal (LC) 5CB, formed inside flat capillaries with a homeotropic surface orientation. A decay flow of the liquid crystal arising under the action of DC electric field and hydrostatic pressure gradient was experimentally realized and studied by the registration of meniscus’ motion in the vertically oriented cylindrical capillary. The dependences of the maximal value of the meniscus’ rise and characteristic decay time on the control voltage have been obtained. The analysis of the experimental data was performed in the framework of a simple model, taking into account the dependence of dielectric permittivity on the electrically controlled orientation of LC. The value of zeta potential as well as the effective shear viscosities at different voltages were determined. The obtained data were compared with the results of independent studies.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46771243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.26
N. V. Balenko, A. Bobrovsky, E. S. Vtyurina, V. P. Shibaev
New liquid crystalline composites based on polyvinyl alcohol films plasticized by glycerol with the dispersed droplets of cholesteric liquid crystal have been obtained and investigated. The mechano-optical properties of the obtained composites have been studied. It is shown that under the stretching the peak of selective light reflection shifts to the short-wavelength region of the spectrum. The amplitude of the shift depends on the stretching degree and reaches 100 nm. The obtained polymer composites are promising for creating optomechanical tensile and deformation sensors.
{"title":"Mechanosensitive Liquid Crystalline Composites Based on Cholesterics Dispersed in Polyvinyl Alcohol Films","authors":"N. V. Balenko, A. Bobrovsky, E. S. Vtyurina, V. P. Shibaev","doi":"10.18083/lcappl.2021.3.26","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.26","url":null,"abstract":"New liquid crystalline composites based on polyvinyl alcohol films plasticized by glycerol with the dispersed droplets of cholesteric liquid crystal have been obtained and investigated. The mechano-optical properties of the obtained composites have been studied. It is shown that under the stretching the peak of selective light reflection shifts to the short-wavelength region of the spectrum. The amplitude of the shift depends on the stretching degree and reaches 100 nm. The obtained polymer composites are promising for creating optomechanical tensile and deformation sensors.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46517374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-29DOI: 10.18083/lcappl.2021.2.73
N. Kamanina, A. Toikka, D. Kvashnin
The possibilities of displaying the effect of optical limiting of radiation in the visible and near IR-spectrum on the example of liquid crystal (LC) systems are considered and compared with sensitized solutions, suspensions and thin-film structures. For the first time, the effect of optical limiting is shown for a liquid crystal – WS 2 nanoparticle system irradiated at the wavelength of the pulsed Er-laser of 1.54 microns. Experimental results are sup-ported by quantum-chemical simulations. Based on the analyzed experimental data, it is proposed that the devel-oped LC cells with different types of nanostructures can be effectively used for laser and biomedical industries.
{"title":"Liquid Crystal Systems with WS2 Nanoparticles in the Optical Limiting Effect","authors":"N. Kamanina, A. Toikka, D. Kvashnin","doi":"10.18083/lcappl.2021.2.73","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.73","url":null,"abstract":"The possibilities of displaying the effect of optical limiting of radiation in the visible and near IR-spectrum on the example of liquid crystal (LC) systems are considered and compared with sensitized solutions, suspensions and thin-film structures. For the first time, the effect of optical limiting is shown for a liquid crystal – WS 2 nanoparticle system irradiated at the wavelength of the pulsed Er-laser of 1.54 microns. Experimental results are sup-ported by quantum-chemical simulations. Based on the analyzed experimental data, it is proposed that the devel-oped LC cells with different types of nanostructures can be effectively used for laser and biomedical industries.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41366810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-29DOI: 10.18083/lcappl.2021.2.92
A. Sonin, A. A. Sonin
{"title":"Professor A. B. Mlodzeyevsky’s Missed Discovery","authors":"A. Sonin, A. A. Sonin","doi":"10.18083/lcappl.2021.2.92","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.92","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67676748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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