Pub Date : 2023-12-26DOI: 10.18083/lcappl.2023.4.67
M. P. Vekovishchev, E. A. Kirsanov
{"title":"Non-Newtonian Flow of Structured Systems. XXXVII. Viscoelasticity of Clay / Nylon-11 Polymer Composite","authors":"M. P. Vekovishchev, E. A. Kirsanov","doi":"10.18083/lcappl.2023.4.67","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.67","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"11 13","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139155658","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 : 2023-12-26DOI: 10.18083/lcappl.2023.4.38
A. I. Galeeva, Nataliya M. Selivanova, Yuriy G. Galyametdinov
Lyotropic liquid crystalline systems are of great interest as carriers of biological substances for targeted delivery, mainly for transdermal administration of drugs and their application to the skin and mucous membranes. The wetting and adhesive interactions of lyomesophases and gel based on a chitosan polysaccharide in lactic acid solution on a glass substrate (base surface) and the surface of a semi-permeable polytetrafluoroethylene membrane (model of epidermis horny layer) were studied. The effect of the riboflavin drug (vitamin B2) on the surface tension of studied samples and the amount of adhesion work has been established. It is shown that biocompatible chitosan-containing systems can be used as drug carriers for various biomedical purposes, including transdermal drug delivery.
{"title":"Wetting and Adhesive Properties of Biopolymer-Based Organized Condensed Phases as Drug Delivery Systems","authors":"A. I. Galeeva, Nataliya M. Selivanova, Yuriy G. Galyametdinov","doi":"10.18083/lcappl.2023.4.38","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.38","url":null,"abstract":"Lyotropic liquid crystalline systems are of great interest as carriers of biological substances for targeted delivery, mainly for transdermal administration of drugs and their application to the skin and mucous membranes. The wetting and adhesive interactions of lyomesophases and gel based on a chitosan polysaccharide in lactic acid solution on a glass substrate (base surface) and the surface of a semi-permeable polytetrafluoroethylene membrane (model of epidermis horny layer) were studied. The effect of the riboflavin drug (vitamin B2) on the surface tension of studied samples and the amount of adhesion work has been established. It is shown that biocompatible chitosan-containing systems can be used as drug carriers for various biomedical purposes, including transdermal drug delivery.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"17 4","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139155443","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 : 2023-12-26DOI: 10.18083/lcappl.2023.4.19
Kseniya A. Romanova, Yuriy G. Galyametdinov
This article contains data on the application of quantum-chemical methods for simulation of mesogenic binuclear complexes of europium(III) (Eu(III)) with substituted β-diketones and Lewis bases along with the possibility of prediction of their liquid crystalline (LC) properties. The relationships between geometric parameters of the complexes' molecules, the structural features of their coordination polyhedra and the probability of mesophase behavior were considered. According to the calculated parameters of Voronoi-Dirichlet polyhedra, the structural features of the first coordination sphere of Eu(III) complexes were studied and compared with the data for mononuclear complexes. Using the calculated energies of the ligands' excited states, the luminescence efficiency of the complexes was estimated. The results of quantum-chemical simulations provide recommendations for selection of ligand environment for the synthesis of LC binuclear Eu(III) complexes.
{"title":"Quantum-Chemical Approaches to Creation of Mesogenic Binuclear Europium(III) Complexes with Intensive Luminescence","authors":"Kseniya A. Romanova, Yuriy G. Galyametdinov","doi":"10.18083/lcappl.2023.4.19","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.19","url":null,"abstract":"This article contains data on the application of quantum-chemical methods for simulation of mesogenic binuclear complexes of europium(III) (Eu(III)) with substituted β-diketones and Lewis bases along with the possibility of prediction of their liquid crystalline (LC) properties. The relationships between geometric parameters of the complexes' molecules, the structural features of their coordination polyhedra and the probability of mesophase behavior were considered. According to the calculated parameters of Voronoi-Dirichlet polyhedra, the structural features of the first coordination sphere of Eu(III) complexes were studied and compared with the data for mononuclear complexes. Using the calculated energies of the ligands' excited states, the luminescence efficiency of the complexes was estimated. The results of quantum-chemical simulations provide recommendations for selection of ligand environment for the synthesis of LC binuclear Eu(III) complexes.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"24 72","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139155996","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 : 2023-12-26DOI: 10.18083/lcappl.2023.4.58
Georgy V. Simonenko
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.
{"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}
Pub Date : 2023-12-26DOI: 10.18083/lcappl.2023.4.82
A. I. Alexandrov, T. V. Pashkova
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.
利用 X 射线衍射法研究了手性和非手性丙烯酸酯（二取代联苯和苯甲酸酯）在磁场和（某些情况下）电场定向影响下的介源均聚物和共聚物的结构。利用结构建模和模型衍射计算，按照准晶体的霍斯曼模型对衍射图样进行了分析。结果表明，手性均聚物和非手性均聚物形成了平滑双层极性结构，但由于侧链中 C=O 基团的总偶极矩值较小，非手性均聚物的结构具有较弱的极性。共聚物（与手性均聚物一样）形成平滑双层极性螺旋结构。手性和非手性成分在共双分子层中的分布取决于它们在共聚物中的比例。反过来，这种分布也会影响共聚物的螺旋结构步骤和结构相变的性质。我们对磁场和电场对手性均聚物和共聚物结构的定向影响进行了比较评估。通过分析所研究聚合物的衍射和结构参数的温度依赖性，我们可以解释它们在看似相似（根据 X 射线图案类型）的密相中的一些行为特征。
{"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}
Pub Date : 2023-12-26DOI: 10.18083/lcappl.2023.4.31
Konstantin S. Nikitin, O. Maltceva, N. Mamardashvili, N. Usol'tseva
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.
通过研究有机化合物形成的薄膜表面上水滴的接触角，可以确定薄膜的亲水性/疏水性。了解了亲水性/疏水性，就有可能优化薄膜的成分，增加薄膜的粘合性，从而提高薄膜的功能性。本研究分析了三种化合物的朗缪尔-谢弗薄膜（LS-薄膜）的接触角：5,10,15,20-四苯基卟啉（I）、2-氮杂-21-碳杂-5,10,15,20-四苯基卟啉（II）和 5,15-双(2,6-双(十二烷氧基)苯基)卟啉（III）。获得了所研究卟啉浮层转移数量不同、表面粗糙度不同的 LS 薄膜的接触角数据。结果发现，化合物 I 和 II 的 LS 薄膜具有疏水性，并且其疏水性随着转移数的增加而增加。此外，与化合物 II 相比，化合物 I LS 薄膜表面粗糙度的增加会降低接触角的值。与卟啉 I 和 II 不同，化合物 III 的 LS 薄膜具有亲水性。所获得的数据可用于有针对性地设计化合物，以制造各种用途的薄膜材料。
{"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}
Pub Date : 2023-12-26DOI: 10.18083/lcappl.2023.4.94
E. Pozhidaev, A. V. Kuznetsov, A. Kaznacheev, S. Torgova, T. Tkachenko
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.
{"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}
Pub Date : 2023-12-26DOI: 10.18083/lcappl.2023.4.49
Alexander M. Parshin
Using an electric field, the transmission of light passing through self-organized ensembles of nematic domains is studied. Modulation characteristics of the ensembles containing domains with non-oriented and magnetic-field-oriented disclination lines are compared. A significant decrease in light scattering is shown when disclination lines are oriented. The calculated and well agreeing with them experimental dependences of light transmission on electric voltage applied to liquid crystal cells are obtained and presented. Oscillations on light transmission curves are studied. Superpositions of ordinary and extraordinary waves propagating through the domain ensembles and homogeneous planar liquid crystal layers are considered. The spectral characteristics of the ensembles are presented.
{"title":"Modulation of Light Transmission in Self-Organized Ensembles of Nematic Domains","authors":"Alexander M. Parshin","doi":"10.18083/lcappl.2023.4.49","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.49","url":null,"abstract":"Using an electric field, the transmission of light passing through self-organized ensembles of nematic domains is studied. Modulation characteristics of the ensembles containing domains with non-oriented and magnetic-field-oriented disclination lines are compared. A significant decrease in light scattering is shown when disclination lines are oriented. The calculated and well agreeing with them experimental dependences of light transmission on electric voltage applied to liquid crystal cells are obtained and presented. Oscillations on light transmission curves are studied. Superpositions of ordinary and extraordinary waves propagating through the domain ensembles and homogeneous planar liquid crystal layers are considered. The spectral characteristics of the ensembles are presented.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"96 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139157224","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 : 2023-12-26DOI: 10.18083/lcappl.2023.4.76
V. Kuryakov
A stable aqueous dispersion of n-heptadecane was prepared by ultrasonification without the addition of surfactants. Using the dynamic light scattering, the characteristic size (hydrodynamic radius) of the dispersion‘s particles (100 nm) was determined. On the basis of temperature dependence measurements of scattered light intensity, the temperatures of melting, crystallization and transition to rotator phase of n-heptadecane particles in the studied dispersion were determined. The results obtained are in good agreement with literature data. It has also been experimentally shown that this aqueous dispersion can withstand up to 400 thermal cycles of heating and cooling from 3 °C to 30 °C, retaining ist colloidal stability. The results obtained allow to consider this dispersion as a promising basis for the development of Phase Change Materials.
在不添加表面活性剂的情况下，通过超声波制备了稳定的正十七烷水分散液。利用动态光散射法测定了分散体颗粒的特征尺寸（流体力学半径）（100 nm）。根据散射光强度的温度依赖性测量结果，确定了所研究的分散体中正十七烷颗粒的熔化、结晶和向旋转相转变的温度。所得结果与文献数据十分吻合。实验还表明，这种水分散液可以承受从 3 °C 到 30 °C 的 400 次加热和冷却热循环，并保持胶体稳定性。根据所获得的结果，我们可以认为这种分散体是开发相变材料的一个很有前途的基础。
{"title":"Stability of Nano-Sized Aqueous Dispersion of n-Heptadecane to Thermal Cycling","authors":"V. Kuryakov","doi":"10.18083/lcappl.2023.4.76","DOIUrl":"https://doi.org/10.18083/lcappl.2023.4.76","url":null,"abstract":"A stable aqueous dispersion of n-heptadecane was prepared by ultrasonification without the addition of surfactants. Using the dynamic light scattering, the characteristic size (hydrodynamic radius) of the dispersion‘s particles (100 nm) was determined. On the basis of temperature dependence measurements of scattered light intensity, the temperatures of melting, crystallization and transition to rotator phase of n-heptadecane particles in the studied dispersion were determined. The results obtained are in good agreement with literature data. It has also been experimentally shown that this aqueous dispersion can withstand up to 400 thermal cycles of heating and cooling from 3 °C to 30 °C, retaining ist colloidal stability. The results obtained allow to consider this dispersion as a promising basis for the development of Phase Change Materials.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"23 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139155334","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 : 2023-09-29DOI: 10.18083/lcappl.2023.3.36
Nataliya M. Selivanova, Nikita A. Melnikov, Elena M. Kulagina, Vyacheslav E. Semenov
New terbium and europium heteroligand complexes with substituted 1,2,3-triazole – bis-1,3-(4-methylcarboxyl-1,2,3-triazol-1-yl)xylylene have been synthesized. A study of luminescent properties showed that the complexes exhibit high optical characteristics. The luminescence efficiency of [Tb(AcAc)2(TR)(H2O)2], increases by 13 % compared to the monoligand complex [Tb(AcAc)3(H2O)2]. In order to create biocompatible systems, an approach for the solubilization of hydrophobic complexes by incorporating them into the lyomesophase structure of P123/DMSO has been developed. According to polarization optical microscopy, the hybrid system containing 0.2 % of the [Tb(AcAc)3(H2O)2] complex shows a lamellar mesophase. Fluorescence microscopy study showed that the [Eu(TTA)2(TR)(H2O)2] complex is efficiently adsorbed on the surface of the Paramecium caudatum microorganism and exhibits red luminescence allowing visualization of biological objects.
{"title":"Luminescent Media Based on Heteroligand Lanthanide Complexes and Lyotropic Mesophases for Bioimaging Application","authors":"Nataliya M. Selivanova, Nikita A. Melnikov, Elena M. Kulagina, Vyacheslav E. Semenov","doi":"10.18083/lcappl.2023.3.36","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.36","url":null,"abstract":"New terbium and europium heteroligand complexes with substituted 1,2,3-triazole – bis-1,3-(4-methylcarboxyl-1,2,3-triazol-1-yl)xylylene have been synthesized. A study of luminescent properties showed that the complexes exhibit high optical characteristics. The luminescence efficiency of [Tb(AcAc)2(TR)(H2O)2], increases by 13 % compared to the monoligand complex [Tb(AcAc)3(H2O)2]. In order to create biocompatible systems, an approach for the solubilization of hydrophobic complexes by incorporating them into the lyomesophase structure of P123/DMSO has been developed. According to polarization optical microscopy, the hybrid system containing 0.2 % of the [Tb(AcAc)3(H2O)2] complex shows a lamellar mesophase. Fluorescence microscopy study showed that the [Eu(TTA)2(TR)(H2O)2] complex is efficiently adsorbed on the surface of the Paramecium caudatum microorganism and exhibits red luminescence allowing visualization of biological objects.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135193637","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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