Liquid Crystals and their Application最新文献

Non-Newtonian Flow of Structured Systems. XXXVII. Viscoelasticity of Clay / Nylon-11 Polymer Composite 结构系统的非牛顿流体。XXXVII.粘土/尼龙-11 聚合物复合材料的粘弹性

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.67

M. P. Vekovishchev, E. A. Kirsanov

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Wetting and Adhesive Properties of Biopolymer-Based Organized Condensed Phases as Drug Delivery Systems 作为给药系统的生物聚合物有组织凝聚相的润湿性和粘附性

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.38

A. I. Galeeva, Nataliya M. Selivanova, Yuriy G. Galyametdinov

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Quantum-Chemical Approaches to Creation of Mesogenic Binuclear Europium(III) Complexes with Intensive Luminescence 用量子化学方法制备具有强烈发光特性的中生双核铕（III）配合物

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.19

Kseniya A. Romanova, Yuriy G. Galyametdinov

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Influence of Design Parameters of Liquid Crystal Cell on the Optical Threshold Voltage Value of Electro-Optical Effect 液晶电池设计参数对电光效应光阈值电压值的影响

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.58

Georgy V. Simonenko

{"title":"Influence of Design Parameters of Liquid Crystal Cell on the Optical Threshold Voltage Value of Electro-Optical Effect","authors":"Georgy V. Simonenko","doi":"10.18083/lcappl.2023.4.58","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.58","url":null,"abstract":"The influence of liquid-crystal (LC) cell design parameters on the voltage of the optical threshold of the interference effect of polarized beams controlled by an electric field has been studied by computer simulation. It is shown that under strict boundary conditions (both symmetrical and antisymmetrical), the voltage value of the optical threshold decreases rapidly depending on the cell thickness in an exponential manner and reaches a certain constant value. Under non-strict boundary conditions (both symmetrical and antisymmetrical), the voltage dependence of the optical threshold on the LC layer thickness follows a hyperbolic pattern. At the same time, under strict symmetric boundary conditions, the voltage magnitude of the optical threshold effect decreases exponentially with an increase in the pretilt angle of LC molecules on the orienting surfaces. If the boundary conditions are rigid and antisymmetric, an increase in the pretilt angle on the orienting surfaces results in a linear decrease of the optical threshold voltage of the effect. The voltage magnitude of the optical threshold effect increases linearly with an increase in the twist angle of the LC structure in the cell, for both symmetric and antisymmetric boundary conditions. A decrease in the anchoring energy of LC molecules on a substrate leads to a decrease in the voltage of the optical threshold of the effect, and this regularity has an exponential character depending on the reciprocal value of the anchoring energy of LC molecules on orienting substrates.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"92 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139155907","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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Structure Investigation of Mesogenic Homo- and Copolymers Based on Chiral and Achiral Acrylates 基于手性和非手性丙烯酸酯的中生型均聚物和共聚物的结构研究

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.82

A. I. Alexandrov, T. V. Pashkova

{"title":"Structure Investigation of Mesogenic Homo- and Copolymers Based on Chiral and Achiral Acrylates","authors":"A. I. Alexandrov, T. V. Pashkova","doi":"10.18083/lcappl.2023.4.82","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.82","url":null,"abstract":"The X-ray diffraction method was used to study the structure of mesogenic homo- and copolymers based on chiral and achiral acrylates (disubstituted biphenyl and phenylbenzoate) under the orienting influence of magnetic and (in some cases) electric fields. The analysis of diffraction patterns was carried out in terms of the Hosemann model of a paracrystal using structural modeling and diffraction calculations on models. It was established that chiral and achiral homopolymers form smectic bilayer polar structures, but the structure of the achiral homopolymer possesses weak polarization due to small value of total dipole moment of C=O groups in the side chains. The copolymers (as the chiral homopolymer) form smectic bilayer polar helicoidal structures. The distribution of chiral and achiral components in the layers of the common bilayer depends on their ratios in the copolymer. In turn, this distribution affects both the step of helicoidal structure and the nature of structural-phase transformations in the copolymers. A comparative evaluation of the orientational effects of magnetic and electric fields on the structure of the chiral homopolymer and the copolymers has been carried out. The analysis of the temperature dependences of diffraction and structural parameters of the investigated polymers allowed us to explain some features of their behaviour within seemingly similar (by the type of X-ray patterns) smectic phases.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"4 43","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139156567","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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Influence of the Porphyrin Structures on the Contact Angle of Water Wetting by Langmuir-Schaefer Films 卟啉结构对 Langmuir-Schaefer 薄膜润湿水的接触角的影响

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.31

Konstantin S. Nikitin, O. Maltceva, N. Mamardashvili, N. Usol'tseva

{"title":"Influence of the Porphyrin Structures on the Contact Angle of Water Wetting by Langmuir-Schaefer Films","authors":"Konstantin S. Nikitin, O. Maltceva, N. Mamardashvili, N. Usol'tseva","doi":"10.18083/lcappl.2023.4.31","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.31","url":null,"abstract":"Studying the contact angle of water droplets on the surfaces of thin films formed by organic compounds allows to establish hydrophilic/hydrophobic properties of the films. Knowledge of hydrophilicity/hydrophobicity makes it possible to optimize the composition and increase the adhesive properties of films, improving their functionality. In this study, the dependence of the contact angle of Langmuir-Schaefer films (LS-films) of three compounds: 5,10,15,20-tetraphenylporphyrin (I), 2-aza-21-carba-5,10,15,20-tetraphenyl-porphyrin (II), and 5,15-bis(2,6-bis(dodecycloxy)phenyl)porphyrin (III) was examined. Contact angle data were obtained for LS-films with different transfer numbers of floating layers of the studied porphyrins and different surface roughness. It was found that LS-films of compounds I and II are hydrophobic and their hydrophobicity increases with an increasing of transfer number. In addition, an increase in the surface roughness of the LS film of compound I compared to compound II reduces the value of the contact angle. Unlike porphyrins I and II, LS-films of compound III displayed hydrophilic properties. The obtained data can be used for the targeted design of compounds to create thin film materials of various purposes.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"5 46","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139156506","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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Liquid Crystalline Electro-Optical Modulator of Submegahertz Range 亚兆赫兹范围的液晶光电调制器

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.94

E. Pozhidaev, A. V. Kuznetsov, A. Kaznacheev, S. Torgova, T. Tkachenko

{"title":"Liquid Crystalline Electro-Optical Modulator of Submegahertz Range","authors":"E. Pozhidaev, A. V. Kuznetsov, A. Kaznacheev, S. Torgova, T. Tkachenko","doi":"10.18083/lcappl.2023.4.94","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.94","url":null,"abstract":"A liquid crystalline (LC) electro-optical modulator providing an electro-optical response time up to 400 nanoseconds with a modulation frequency up to 500 kHz has been developed. The ferroelectric liquid crystal FLC-576 obtained by us was used as the electro-optical medium of the modulator. Its helix pitch р0 is much smaller than wavelengths of visible light (р0 < 100 nm). The liquid crystal operates in the deformed helix ferroelectric mode (DHF-effect) under the action of electric fields. The controlling electric fields are less than a critical field of helix unwinding. At high frequencies of the control voltage (over 10 kHz), the heating of electro-optical cell by repolarization currents of FLC can occur up to the temperature of phase transition from ferroelectric to paraelectric phase, which leads to the cessation of electro-optical modulation. The work experimentally and theoretically examines the self-heating issues of electro-optical modulators depending on the liquid crystal layer thickness, frequency and strength of applied electric field. The heat removal conditions from the liquid crystal cell have been determined and experimentally implemented. Under these conditions the LC is in the smectic C* ferroelectric phase temperature range, which is necessary to provide electro-optical modulation in submegaherts diapason.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"19 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139155379","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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Modulation of Light Transmission in Self-Organized Ensembles of Nematic Domains 自组织向列域集合体中的光传输调制

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.49

Alexander M. Parshin

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Stability of Nano-Sized Aqueous Dispersion of n-Heptadecane to Thermal Cycling 正十七烷纳米级水分散液对热循环的稳定性

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Liquid Crystals and their Application Pub Date : 2023-12-26 DOI: 10.18083/lcappl.2023.4.76

V. Kuryakov

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Luminescent Media Based on Heteroligand Lanthanide Complexes and Lyotropic Mesophases for Bioimaging Application 基于异寡和镧系配合物和溶致中间相的发光介质在生物成像中的应用

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.36

Nataliya M. Selivanova, Nikita A. Melnikov, Elena M. Kulagina, Vyacheslav E. Semenov

引用次数: 0