Liquid Crystals and their Application最新文献_第2页

Non-Newtonian Flow of Hydrolyzed Polyacrylamide Solution 水解聚丙烯酰胺溶液的非牛顿流动

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.77

Yuriy N. Timoshin, Еvgeniy A. Kirsanov

引用次数: 0

Non-Local Q-Tensor Approach for Description of Elastic Deformations of Nematic Liquid Crystals at Sub-Micron Scale 亚微米尺度向列液晶弹性变形描述的非局部q张量法

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.66

Sergey I. Trashkeev, Pavel A. Statsenko, Maksim N. Khomyakov, Sergey A. Shvetsov

{"title":"Non-Local Q-Tensor Approach for Description of Elastic Deformations of Nematic Liquid Crystals at Sub-Micron Scale","authors":"Sergey I. Trashkeev, Pavel A. Statsenko, Maksim N. Khomyakov, Sergey A. Shvetsov","doi":"10.18083/lcappl.2023.3.66","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.66","url":null,"abstract":"Within the framework of phenomenological approach, a generalized concept of a non-local order parameter, that have the form of a traceless correlation tensor function or a tensor integral operator, is introduced. The main relationships, which determine the equilibrium orientational states and the phase transitions of a deformed nematic liquid crystal, are described. The resulting expression for the free energy is quadratic with respect to the gradients of the order parameter tensor. The limiting transition of the non-local order parameter to the local one leads to an expression that complements the classical Oseen–Frank theory of elasticity. The considered model includes eight independent elastic constants. Three of them relate to \"bulk\" constants analogous to Frank constants, another three ones relate to \"surface\" constants, and the remaining two constants determine the anisotropic effect of the gradient of the scalar order parameter on the director field. The constants are necessary for the consideration of a liquid crystal state near defects, as well as for the description of orientation effects caused by the inhomogeneity of order parameter. It is shown that in the free energy expression, the \"surface\" terms contribute to the director orientation in the case of a non-constant scalar order parameter, even in the approximation of rigid boundary conditions.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"37 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":"135193770","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}

引用次数: 0

Self-Assembly Mechanism and Analysis of Smectic Mesophase Induction in Binary Systems of 4-(4-Alkoxyphenylazo)benzonitriles and Dodecyloxybenzoic Acid 4-(4-烷氧基苯基偶氮)苯并腈与十二烷基氧基苯甲酸二元体系的自组装机理及近晶中间相诱导分析

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.5

Аntonina I. Smirnova, Nina I. Giricheva, Elena A. Lapykina, Nadezhda V. Usol'tseva

{"title":"Self-Assembly Mechanism and Analysis of Smectic Mesophase Induction in Binary Systems of 4-(4-Alkoxyphenylazo)benzonitriles and Dodecyloxybenzoic Acid","authors":"Аntonina I. Smirnova, Nina I. Giricheva, Elena A. Lapykina, Nadezhda V. Usol'tseva","doi":"10.18083/lcappl.2023.3.5","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.5","url":null,"abstract":"Using a combination of experimental methods (polarizing optical microscopy, IR spectroscopy), the two-component systems consisting of 4-dodecyloxybenzoic acid (BA) and 4-(4-alkoxyphenylazo)benzonitriles (BN-n, n = 8, 10, 12) have been studied. The mesophase existence ranges of the systems depending on the length of alkyl substituents of the component BN-n were established. The possibility of formation as well as stability of heterodimeric complexes with a hydrogen bond –COOH···NC – were analyzed by DFT/B97D/6-311++G** method. In all obtained equimolar BN-n:BA (1:1) systems SmA phase was induced, which manifests itself enantiotropically in wide temperature ranges. With the help of computer simulation, it was shown that, unlike homodimers, the expected BN···BA H-complex has an angular structure, which cannot ensure the formation of the SmA phase. To elucidate the mechanism of mesophase formation in BN-n:BA systems, we calculated the energies of intermolecular interaction in homo- and heterodimers, and analyzed the experimental IR spectra of equimolar BN-n:BA systems. The spectra represent a superposition of the spectra of associates BN···BN and cyclic dimers of acid BA···BA. Therefore, we suggest that the BN···BA type H-complexes cannot form in equimolar BN-n:BA mixtures. Instead, a structure consisting of alternating layers of BA···BA dimers and BN···BN associates is formed. The layers of the acid dimer play the main role in the formation of SmA phase. It is noted that –COOH group, in contrast to such proton-donor groups as –NH2, –NH–, –OH, does not form hydrogen bonds with the proton-acceptor –CN group.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"50 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":"135193756","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}

引用次数: 0

Influence of Capillary Flow on Self-Organization of Water Droplets in Nematic Liquid Crystal 毛细管流动对向列型液晶中水滴自组织的影响

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.98

Anastasiia A. Vasileva, Sergey V. Pasechnik

{"title":"Influence of Capillary Flow on Self-Organization of Water Droplets in Nematic Liquid Crystal","authors":"Anastasiia A. Vasileva, Sergey V. Pasechnik","doi":"10.18083/lcappl.2023.3.98","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.98","url":null,"abstract":"The results of studying the motion of isotropic liquid drops in a homeotropic layer of liquid crystal Е7 with long-lived instabilities induced by a damped shear flow that occurs when a flat capillary is filled due to the action of capillary forces (capillary flow). An intense flow of nematics with initial homeotropic orientation leads to the appearance of orientational instabilities. In the experiments, a liquid-crystal cell with a variable gap (from 60 to 100 μm) was used. The object of the study was a 10:1 emulsion \"liquid crystal – isotropic liquid\". It was found that drops of isotropic liquid form various types of spatial structures. In particular, chains of drops in the region of strong deformations of LC orientation (for example, at the boundaries of the existence of long-lived regions with a changed orientation) were observed. In addition, an increased concentration of isotropic droplets occurred in the region separating the sections of the liquid crystal under the action of an electric field and in the absence of its action. Based on the analysis of microscopic images, the velocity of mutual motion of two isolated drops was determined. It made possible to estimate the interaction force between the drops (Fa = 5.6 pN) that was caused by the distortions of orientational structure in the vicinity of the drops. The results obtained are discussed within the existing theory of liquid crystals.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"45 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":"135193766","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}

引用次数: 0

Electrically Driven Kink-Like Distortion Waves in Liquid Crystals 液晶中的电驱动扭结畸变波

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.46

Semen S. Kharlamov, Dina V. Shmeliova, Sergey V. Pasechnik, A. V. Zakharov

引用次数: 0

Hydrothermal Synthesis of Highly Effective Carbon Sorbent Based on Renewable Resources 基于可再生资源的高效碳吸附剂的水热合成

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.54

A. E. Burakov, T. S. Kuznetsova, I. V. Burakova, O. A. Ananyeva, E. S. Mkrtchyan, T. P. Dyachkova, A. G. Tkachev

{"title":"Hydrothermal Synthesis of Highly Effective Carbon Sorbent Based on Renewable Resources","authors":"A. E. Burakov, T. S. Kuznetsova, I. V. Burakova, O. A. Ananyeva, E. S. Mkrtchyan, T. P. Dyachkova, A. G. Tkachev","doi":"10.18083/lcappl.2023.3.54","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.54","url":null,"abstract":"The synthesis of new sorption materials by hydrothermal carbonization of sunflower meal (HTS) with the addition of graphene oxide (GO) and subsequent carbonization (C) was developed. To assess the morphological and phase changes during carbonization, the materials were characterized by scanning electron microscopy and IR spectroscopy. According to the results obtained, carbonization promoted the development of latent porosity, as well as a decrease in the amount of oxygen-containing and alkyl groups. Kinetic sorption studies were also carried out on the example of the Pb+2 ions and organic dye molecules – methylene blue (MB), extraction. The experiment results showed that the adsorption capacity of HTS, HTS/C, HTS/GO, and HTS/GO/C composites for the Pb+2 ions extraction was 82.9; 108.6; 168.9; 148.3 mg/g, respectively; and for MB molecules – 1481.8; 1601.1; 1920.3; 2283 mg/g, respectively. It was found that during adsorption of MB molecules, the carbonization effects significantly on the contact time. Carbonized samples show high sorption activity. The equilibrium contact time fort them was 15 min, while for non-carbonized samples it was 60 min. The equilibrium time during the Pb+2 ions adsorption was 60 min for all samples. The adsorption kinetics was described using the following models: pseudo-first order, pseudo-second order, the Elovich model, and intraparticle diffusion. It was found that the adsorption process is limited by the chemical exchange reaction and proceeds in a mixed-diffusion mode.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"15 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":"135193755","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}

引用次数: 0

Effect of Transparency Increasing and Surface Relief of Polyvinyl Alcohol Thin Films with Graphene Oxide of Varied Concentrations: Possible Applications 不同浓度氧化石墨烯对聚乙烯醇薄膜透明度增加和表面浮雕的影响:可能的应用

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.87

N. V. Kamanina, А. S. Toikka, Ya. V. Barnash, L. O. Fedorova, R. M. Tarkan, M. A. Oshkolov, Yu. A. Zubtcova, S. V. Likhomanova, P. V. Kuzhakov

引用次数: 0

Introduction of CdSe/ZnS Quantum Dots into Liquid Crystalline Matrix 液晶基质中CdSe/ZnS量子点的引入

Liquid Crystals and their Application Pub Date : 2023-09-29 DOI: 10.18083/lcappl.2023.3.23

O. N. Karpov, Ya. I. Derikov, A. V. Finko, A. I. Saveliev, S. G. Mikhalyonok, N. M. Kuzmenok, V. S. Bezborodov, R. V. Talroze

引用次数: 0

Sensing Ability of Zn-Tetraphenylporphyrin Langmuir-Schaefer Films zn -四苯基卟啉Langmuir-Schaefer薄膜的传感能力

IF 0.5

Liquid Crystals and their Application Pub Date : 2023-06-29 DOI: 10.18083/lcappl.2023.2.29

O. V. Maltсeva, K. Nikitin, A. Kazak, N. Mamardashvili, N. Usol'tseva

引用次数: 0

Non-Newtonian Flow of Structured Systems. XXXVI. Nanofluid of Iron Oxide Nanoparticles in Ethylene Glycol 结构系统的非牛顿流动。XXXVI。氧化铁纳米粒子在乙二醇中的纳米流体

IF 0.5

Liquid Crystals and their Application Pub Date : 2023-06-29 DOI: 10.18083/lcappl.2023.2.38

M. P. Vekovishchev, E. A. Kirsanov

{"title":"Non-Newtonian Flow of Structured Systems. XXXVI. Nanofluid of Iron Oxide Nanoparticles in Ethylene Glycol","authors":"M. P. Vekovishchev, E. A. Kirsanov","doi":"10.18083/lcappl.2023.2.38","DOIUrl":"https://doi.org/10.18083/lcappl.2023.2.38","url":null,"abstract":"Ключевые слова: реологические кривые, структурная реологическая модель, наножидкость Структурная реологическая модель используется для интерпретации результатов реологических измерений в наножидкости, которая представляет собой суспензию наночастиц оксида железа (гематит) в этиленгликоле, в которой возможна агрегация наночастиц. Уравнения структурной реологической модели использованы для аппроксимации экспериментальных данных на отдельных участках реологических кривых ) (   , ) ( G    , ) ( G   , ) ( G 0    , ) ( G 0   . Каждому выделенному участку кривой соответствует отдельный режим стационарного или осциллирующего течения, который связан со специфическим состоянием структуры наножидкости. Изменение реологических величин при изменении скорости сдвига, амплитуды колебаний или частоты колебаний зависит от изменения количества агрегированных частиц в структурированной жидкости.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49537427","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}

引用次数: 0