Pub Date : 2023-03-30DOI: 10.18083/lcappl.2023.1.78
A. Emelyanenko, S. Shvetsov
{"title":"Discotic Nematic State in a System of Rod-Like Molecules","authors":"A. Emelyanenko, S. Shvetsov","doi":"10.18083/lcappl.2023.1.78","DOIUrl":"https://doi.org/10.18083/lcappl.2023.1.78","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41783808","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 : 2023-03-30DOI: 10.18083/lcappl.2023.1.16
G. V. Kuvshinov, L. O. Monakhov, A. S. Semeikin, A. A. Batrakova, O. Koifman
{"title":"Thermodynamic and Selective Properties of Diatomite Adsorbent Modified by the Mixture of 4-(2-Hydroxyethoxy)-4'-Formylazobenzene and Iron μ-Oxodimer of 2,8,12,18-Tetramethyl-3,7,13,17-Tetra-n-Amylporphin under Conditions of Inverted Gas Chromatography","authors":"G. V. Kuvshinov, L. O. Monakhov, A. S. Semeikin, A. A. Batrakova, O. Koifman","doi":"10.18083/lcappl.2023.1.16","DOIUrl":"https://doi.org/10.18083/lcappl.2023.1.16","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49653278","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 : 2023-03-30DOI: 10.18083/lcappl.2023.1.50
G. Zharkova, S. Streltsov
{"title":"Filtration Properties of Polarization Holographic Gratings Recorded in Liquid Crystal Composites","authors":"G. Zharkova, S. Streltsov","doi":"10.18083/lcappl.2023.1.50","DOIUrl":"https://doi.org/10.18083/lcappl.2023.1.50","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46840653","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 : 2023-03-30DOI: 10.18083/lcappl.2023.1.58
M. P. Vekovishchev, E. A. Kirsanov
{"title":"Non-Newtonian Flow of Structured Systems. XXXV. Polymer with Cylindrical Brush Architecture","authors":"M. P. Vekovishchev, E. A. Kirsanov","doi":"10.18083/lcappl.2023.1.58","DOIUrl":"https://doi.org/10.18083/lcappl.2023.1.58","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46087514","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 : 2023-03-30DOI: 10.18083/lcappl.2023.1.28
A. Bezrukov, O. A. Potapov, V. V. Osipova, Y. Galyametdinov
{"title":"Orientational Behavior of Nematic Liquid Crystals in Two-Phase Microfluidic Systems","authors":"A. Bezrukov, O. A. Potapov, V. V. Osipova, Y. Galyametdinov","doi":"10.18083/lcappl.2023.1.28","DOIUrl":"https://doi.org/10.18083/lcappl.2023.1.28","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45563727","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 : 2022-12-22DOI: 10.18083/lcappl.2022.4.83
N. Kamanina, A. Toikka, Yaroslav V. Barnash, D. Redka, S. V. Lihkomanova, Yu. A. Zybtsova, P. V. Kyzhakov, Z. Jovanović, S. Jovanovic
The first experimental results on the functioning of liquid crystal cells doped with CoFe2O4 nanoparticles are presented. Transmission spectra in the visible and near-infrared range, dynamic parameters of the Fredericks effect, refractive characteristics, as well as wetting angles of the mesophase sensitized surfaces have been obtained. The measured surfaces were the K8 Crown glass, the conductive ITO and the ITO treated with a surface electromagnetic wave. The experiment was performed in order to establish the prospect of using such reliefs as a novel liquid crystal composite orientator sensitized with CoFe2O4 nanoparticles. A color change of the liquid crystal matrix, its refractive coefficients alterations, and the variation of inclination angle of the sensitized liquid crystal droplets on the considered reliefs were established. The time reaction parameters and the medium relaxation parameters were measured. It was proposed that the liquid crystal composition is a kind of an immersion medium that preserves properties of the introduced nanoparticles, which expands their application scope in optoelectronics and biomedicine.
{"title":"Functioning Features of Liquid Crystalline Cells Doped with CoFe2O4 Nanoparticles","authors":"N. Kamanina, A. Toikka, Yaroslav V. Barnash, D. Redka, S. V. Lihkomanova, Yu. A. Zybtsova, P. V. Kyzhakov, Z. Jovanović, S. Jovanovic","doi":"10.18083/lcappl.2022.4.83","DOIUrl":"https://doi.org/10.18083/lcappl.2022.4.83","url":null,"abstract":"The first experimental results on the functioning of liquid crystal cells doped with CoFe2O4 nanoparticles are presented. Transmission spectra in the visible and near-infrared range, dynamic parameters of the Fredericks effect, refractive characteristics, as well as wetting angles of the mesophase sensitized surfaces have been obtained. The measured surfaces were the K8 Crown glass, the conductive ITO and the ITO treated with a surface electromagnetic wave. The experiment was performed in order to establish the prospect of using such reliefs as a novel liquid crystal composite orientator sensitized with CoFe2O4 nanoparticles. A color change of the liquid crystal matrix, its refractive coefficients alterations, and the variation of inclination angle of the sensitized liquid crystal droplets on the considered reliefs were established. The time reaction parameters and the medium relaxation parameters were measured. It was proposed that the liquid crystal composition is a kind of an immersion medium that preserves properties of the introduced nanoparticles, which expands their application scope in optoelectronics and biomedicine.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45755853","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 : 2022-12-22DOI: 10.18083/lcappl.2022.4.6
Kseniya A. Romanova, Y. Galyametdinov
The results of quantum-chemical simulation of the molecular structure and excited states of some mesogenic europium(III) (Eu(III)) complexes and liquid-crystalline (LC) (co)polymers are provided. These objects represent the components of currently relevant composites with a hybrid structure, unique optical and magnetic properties for optoelectronic devices. The relationships between the geometric parameters, LC properties, and luminescence efficiency of the mesogenic Eu(III) complexes with &beta-diketones and Lewis bases have been studied. The calculated values of the lowest singlet and triplet excited states were used to determine the channels of inter- and intramolecular energy transfer between the excited levels of polymers and Eu(III) complexes. The data of quantum-chemical simulation allowed to select components for the subsequent synthesis and creation of effective optoelectronic materials.
{"title":"Luminescence Efficiency of Mesogenic Europium(III) Complexes and their Composites with Polymers According to Quantum-Chemical Simulation","authors":"Kseniya A. Romanova, Y. Galyametdinov","doi":"10.18083/lcappl.2022.4.6","DOIUrl":"https://doi.org/10.18083/lcappl.2022.4.6","url":null,"abstract":"The results of quantum-chemical simulation of the molecular structure and excited states of some mesogenic europium(III) (Eu(III)) complexes and liquid-crystalline (LC) (co)polymers are provided. These objects represent the components of currently relevant composites with a hybrid structure, unique optical and magnetic properties for optoelectronic devices. The relationships between the geometric parameters, LC properties, and luminescence efficiency of the mesogenic Eu(III) complexes with &beta-diketones and Lewis bases have been studied. The calculated values of the lowest singlet and triplet excited states were used to determine the channels of inter- and intramolecular energy transfer between the excited levels of polymers and Eu(III) complexes. The data of quantum-chemical simulation allowed to select components for the subsequent synthesis and creation of effective optoelectronic materials.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49505338","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 : 2022-12-22DOI: 10.18083/lcappl.2022.4.102
T. Dyachkova, A. Rukhov, Y. Khan, D. Protasov, D. Stolbov, E. Burakova, G. A. Titov, A. Tkachev
Mixtures of carbon nanotubes (CNTs) and graphene oxide (GO) in composite materials often exhibit synergistic effects with respect to mechanical and electrophysical properties. In this paper, the mechanisms of interaction between CNTs, GO and epoxydian resin macromolecules were discussed based on the results of molecular dynamics simulations. Calculations were performed in the MM3 force field at exposure times up to 100 ps. The influence of the CNT’s graphene layers shape and the presence of oxygen-containing functional groups on the self-assembly process during the epoxy composite formation has been demonstrated. It is shown that graphene oxide sheets are arranged around cylindrical nanotubes and envelop them, while when using tapered nanotubes, the formation of alternating layers of CNTs and GO should be expected. The presence of oxygen-containing groups on the surface of cylindrical nanotubes promotes the penetration of epoxydian resin macromolecules into the space between CNTs and GO. The simulation results of the "cylindrical CNTs - GO" and the "conical CNTs - GO" hybrid particles were confirmed by scanning electron microscopy data.
{"title":"Interaction of Components of Epoxy Composite Containing Carbon Nanotubes and Graphene Oxide Mixture","authors":"T. Dyachkova, A. Rukhov, Y. Khan, D. Protasov, D. Stolbov, E. Burakova, G. A. Titov, A. Tkachev","doi":"10.18083/lcappl.2022.4.102","DOIUrl":"https://doi.org/10.18083/lcappl.2022.4.102","url":null,"abstract":"Mixtures of carbon nanotubes (CNTs) and graphene oxide (GO) in composite materials often exhibit synergistic effects with respect to mechanical and electrophysical properties. In this paper, the mechanisms of interaction between CNTs, GO and epoxydian resin macromolecules were discussed based on the results of molecular dynamics simulations. Calculations were performed in the MM3 force field at exposure times up to 100 ps. The influence of the CNT’s graphene layers shape and the presence of oxygen-containing functional groups on the self-assembly process during the epoxy composite formation has been demonstrated. It is shown that graphene oxide sheets are arranged around cylindrical nanotubes and envelop them, while when using tapered nanotubes, the formation of alternating layers of CNTs and GO should be expected. The presence of oxygen-containing groups on the surface of cylindrical nanotubes promotes the penetration of epoxydian resin macromolecules into the space between CNTs and GO. The simulation results of the \"cylindrical CNTs - GO\" and the \"conical CNTs - GO\" hybrid particles were confirmed by scanning electron microscopy data.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49555277","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 : 2022-12-22DOI: 10.18083/lcappl.2022.4.92
katerina M. Budynina, Sofiya I. Torgova, Artemiy V. Kuznetsov, E. Pozhidaev
The results of the synthesis and study of a new fluorinated achiral smectic C liquid crystal, namely, 2-(3-fluoro-4'-pentylbiphenyl-4-yl)-5-hexylpyrimidine, are presented. The possibility to use this compound as a matrix for ferroelectric liquid crystal (FLC) mixtures is evaluated. Two mixtures have been prepared: one (FLC-691-F) is based on new fluorinated compound and another (FLC-691) on its non-fluorinated analogue. The diester of optically active 2-octanol and terphenyldicarboxylic acid was used as a chiral dopant for both mixtures. Investigation of these FLC mixtures parameters: phase transition temperatures, helix pitch, spontaneous polarization and tilt angle show significant influence of fluorine atom. When comparing the phase sequence of FLC-691 and FLC-691-F mixtures, one can note that in the fluorine containing mixture an additional smectic A phase arises. At the same temperatures, the helix pitch of FLC-691-F is 2 – 2.5 times less than the helix pitch of FLC-691. The tilt angle of FLC-691-F is much smaller than that of FLC-691 but its value approaches the optimal value of 22.5 degrees, which ensures maximum light transmittance of electro-optical cells. At the same time the presence of fluorine atom in the matrix is a reason for the decrease of the mixture spontaneous polarization and a significant decrease (almost 4 times) in the driving voltage of electro-optical light shutters. As a result, it was shown that the fluorinated matrix provides new possibilities for controlling the mixture parameters.
{"title":"Fluorinated Biphenylpyrimidine as a Possible Matrix for Ferroelectric Liquid Crystal Mixtures","authors":"katerina M. Budynina, Sofiya I. Torgova, Artemiy V. Kuznetsov, E. Pozhidaev","doi":"10.18083/lcappl.2022.4.92","DOIUrl":"https://doi.org/10.18083/lcappl.2022.4.92","url":null,"abstract":"The results of the synthesis and study of a new fluorinated achiral smectic C liquid crystal, namely, 2-(3-fluoro-4'-pentylbiphenyl-4-yl)-5-hexylpyrimidine, are presented. The possibility to use this compound as a matrix for ferroelectric liquid crystal (FLC) mixtures is evaluated. Two mixtures have been prepared: one (FLC-691-F) is based on new fluorinated compound and another (FLC-691) on its non-fluorinated analogue. The diester of optically active 2-octanol and terphenyldicarboxylic acid was used as a chiral dopant for both mixtures. Investigation of these FLC mixtures parameters: phase transition temperatures, helix pitch, spontaneous polarization and tilt angle show significant influence of fluorine atom. When comparing the phase sequence of FLC-691 and FLC-691-F mixtures, one can note that in the fluorine containing mixture an additional smectic A phase arises. At the same temperatures, the helix pitch of FLC-691-F is 2 – 2.5 times less than the helix pitch of FLC-691. The tilt angle of FLC-691-F is much smaller than that of FLC-691 but its value approaches the optimal value of 22.5 degrees, which ensures maximum light transmittance of electro-optical cells. At the same time the presence of fluorine atom in the matrix is a reason for the decrease of the mixture spontaneous polarization and a significant decrease (almost 4 times) in the driving voltage of electro-optical light shutters. As a result, it was shown that the fluorinated matrix provides new possibilities for controlling the mixture parameters.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43218715","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 : 2022-12-22DOI: 10.18083/lcappl.2022.4.16
O. Akopova, N. Zharnikova, N. V. Bumbina, A. Smirnova, А. S. Kashitsyn, N. Usol'tseva
The possibility of using the method of molecular parameters, developed earlier for the prediction of columnar mesomorphism in discotic compounds, was analyzed as applied to star-shaped derivatives of tristriazolotriazine (TTT). Two series of TTT derivatives of different isomeric structures with tangential t-TTT (79 structures) and radial r-TTT (22 structures) positions of phenyl rings were used for analysis. The mesomorphism of these compounds was known from the literature data. Modeling and optimization of 101 structures were carried out and data on the prediction of columnar mesomorphism were obtained using the “CMP ChemCard” software product. The high reliability of the prediction was proved only for t-isomer derivatives of TTT (coincidence with the experiment – 80.4%). For r-isomers, the reliability of the prediction was 52.3%. Based on the prediction results, it is assumed that 29 mesogenic structures of t-TTT series, for which the supramolecular structure of the mesophase has not been previously identified, form mesophase of columnar type.
{"title":"Method of Molecular Parameters for Columnar Mesomorphism Prediction of Tristriazolotriazines","authors":"O. Akopova, N. Zharnikova, N. V. Bumbina, A. Smirnova, А. S. Kashitsyn, N. Usol'tseva","doi":"10.18083/lcappl.2022.4.16","DOIUrl":"https://doi.org/10.18083/lcappl.2022.4.16","url":null,"abstract":"The possibility of using the method of molecular parameters, developed earlier for the prediction of columnar mesomorphism in discotic compounds, was analyzed as applied to star-shaped derivatives of tristriazolotriazine (TTT). Two series of TTT derivatives of different isomeric structures with tangential t-TTT (79 structures) and radial r-TTT (22 structures) positions of phenyl rings were used for analysis. The mesomorphism of these compounds was known from the literature data. Modeling and optimization of 101 structures were carried out and data on the prediction of columnar mesomorphism were obtained using the “CMP ChemCard” software product. The high reliability of the prediction was proved only for t-isomer derivatives of TTT (coincidence with the experiment – 80.4%). For r-isomers, the reliability of the prediction was 52.3%. Based on the prediction results, it is assumed that 29 mesogenic structures of t-TTT series, for which the supramolecular structure of the mesophase has not been previously identified, form mesophase of columnar type.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43839711","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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