Liquid Crystals and their Application最新文献_第8页

Luminescent Composites Based on Liquid Crystalline Europium(III) Complex and CdSe/CdS/ZnS Quantum Dots 基于液晶铕(III)配合物和CdSe/CdS/ZnS量子点的发光复合材料

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Liquid Crystals and their Application Pub Date : 2022-03-31 DOI: 10.18083/lcappl.2022.1.27

Y. Galyametdinov, A. Krupin, D. O. Sagdeev, M. E. Karyakin, R. R. Shamilov, A. Knyazev

引用次数: 1

Non-Newtonian Flow Of Structured Systems. XXXII. Viscoelasticity of the Solution of Hydrophobically Modified Hydroxyethyl Cellulose 结构化系统的非牛顿流。第十七届。疏水改性羟乙基纤维素溶液的粘弹性

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Liquid Crystals and their Application Pub Date : 2022-03-31 DOI: 10.18083/lcappl.2022.1.56

M. P. Vekovishchev, E. A. Kirsanov

引用次数: 0

Influence of UV-Radiation on Surface Relief and Properties of 2-Cyclooctylamino-5-Nitropyridine – Fullerene Thin Film For Orientation of Liquid Crystals 紫外辐射对2-环辛基胺-5-硝基吡啶-富勒烯液晶取向薄膜表面起伏和性能的影响

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Liquid Crystals and their Application Pub Date : 2022-03-31 DOI: 10.18083/lcappl.2022.1.39

S. Likhomanova, G. Zvereva, N. Kamanina

引用次数: 0

Electrically Controlled Ionic Modification of Surface Anchoring in Liquid Crystal Materials 液晶材料表面锚定的电控离子改性

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Liquid Crystals and their Application Pub Date : 2022-03-31 DOI: 10.18083/lcappl.2022.1.89

V. Sutormin, M. Krakhalev, A. Gardymova, O. Prishchepa, I. Timofeev, A. Shabanov, V. Zyryanov

引用次数: 1

Influence of Structural Features of Azo-, Azoxy-, Azodioxy-Benzenes and Pyridines on Mesomorphic Properties of Systems on their Basis 偶氮、偶氮氧基、偶氮二氧基苯和吡啶类化合物的结构特征对体系中相性质的影响

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Liquid Crystals and their Application Pub Date : 2021-12-29 DOI: 10.18083/lcappl.2021.4.37

N. Giricheva, I. Lebedev, M. S. Fedorov

{"title":"Influence of Structural Features of Azo-, Azoxy-, Azodioxy-Benzenes and Pyridines on Mesomorphic Properties of Systems on their Basis","authors":"N. Giricheva, I. Lebedev, M. S. Fedorov","doi":"10.18083/lcappl.2021.4.37","DOIUrl":"https://doi.org/10.18083/lcappl.2021.4.37","url":null,"abstract":". The DFT/B3LYP/cc-pVTZ method was used to determine geometric parameters, electronic and vibrational characteristics of trans-isomers of azo-, azoxy-, azodioxy-benzene and azo-, azoxy-pyridine, which can act as precursors for synthesis of individual compounds or as components of supramolecular complexes with mesomorphic properties. It has been shown that azo-, azoxy-, and azodioxy bridging groups are electron accep-tors with respect to phenyl and pyridine fragments. The effect of the oxygen atom number in bridging group on the properties of molecules is estimated. The internal rotation potential functions U( φ ) and torsional vibration amplitudes of phenyl and pyridine fragments, leading to distortion of planar structure of molecules, are calculated. A correlation between the calculated function U( φ ) and the distribution diagram of the torsion angle φ (CCNN) in the –Ph–N=N–Ph– fragment among the conformations stabilized in crystals is shown. It is assumed that in the Ph–N=N–Ph molecules possessing a larger amplitude of phenyl (Ph) torsional vibrations than the molecules with azoxy- and azodioxy-groups, the appearance of short-range disorder in the crystal at a lower temperature can be expected. For the Ph1–N(O)–N–Ph2 compounds, the asymmetry of molecular core and different amplitudes of torsional vibrations of the phenyl fragments Ph1 and Ph2 could be the reason for the expansion of mesophase existence temperature range ∆Т . The data obtained for the reference molecules make it possible to predict conformational properties and structural non-rigidity of numerous mesomorphic compounds containing the studied fragments.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42117927","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: 1

Liquid Crystal Materials under Conical Boundary Conditions 锥形边界条件下的液晶材料

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Liquid Crystals and their Application Pub Date : 2021-12-29 DOI: 10.18083/lcappl.2021.4.99

M. Krakhalev, V. Rudyak, V. Sutormin, O. Prishchepa, R. G. Bikbaev, I. Timofeev, K. A. Feyzer, V. Zyryanov

引用次数: 1

Lateral Substitution as Effective Tool for Tuning Self-Organising Behaviour of Chiral Mesogens 横向取代作为调节手性介素自组织行为的有效工具

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Liquid Crystals and their Application Pub Date : 2021-12-29 DOI: 10.18083/lcappl.2021.4.23

V. Hamplová, Sergei Mironov, Martin Cigl, Zuzana Böhmová, V. Novotná, Alexej Bubnov

{"title":"Lateral Substitution as Effective Tool for Tuning Self-Organising Behaviour of Chiral Mesogens","authors":"V. Hamplová, Sergei Mironov, Martin Cigl, Zuzana Böhmová, V. Novotná, Alexej Bubnov","doi":"10.18083/lcappl.2021.4.23","DOIUrl":"https://doi.org/10.18083/lcappl.2021.4.23","url":null,"abstract":". Thermotropic liquid crystals belong to an exciting class of self-organising materials, which are broadly utilised now, and, definitely will find advanced applications in future. The combination of fluidity and ordering together with specific electro-optical properties assures their extraordinary practical usefulness. How-ever, the molecular structure – mesomorphic property relationship is still far to be well-established and understood despite more than a hundred years of their existence and intensive study. The design, synthesis and investigation of new liquid crystalline materials with various molecular structure type (rod-like, bend-shaped, disc-like, etc.) and weight (low molar mass, macromolecular) still remain an actual and highlighted task. In this mini-review we discuss relatively broad sub-class of chiral calamitic liquid crystalline materials derived from the lactic acid and give some specific examples on effective tuning of their mesomorphic and electro-optical behaviour using various types of lateral substitution of molecular core. Fluorine, chlorine, bromine and iodine atoms, as well as bulky methyl and methoxy groups are used as lateral substituents on the phenyl ring far from the chiral lactate group. The materials discussed in this work can be potentially used as smart dopants for design of advanced multicomponent mixtures targeted for future applications in opto-electronics and photonics.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47395282","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

The Investigation of the Structure - Phase Transformations of Poly(Propylene Imine) Dendrimer of Second Generation 第二代聚丙烯亚胺树状大分子结构-相转变的研究

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Liquid Crystals and their Application Pub Date : 2021-09-30 DOI: 10.18083/lcappl.2021.3.84

A. Alexandrov, T. V. Pashkova, M. Gruzdev

{"title":"The Investigation of the Structure - Phase Transformations of Poly(Propylene Imine) Dendrimer of Second Generation","authors":"A. Alexandrov, T. V. Pashkova, M. Gruzdev","doi":"10.18083/lcappl.2021.3.84","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.84","url":null,"abstract":"Liquid crystal poly(propylene imine) dendrimer of second generation (D2) was investigated by X-ray diffraction method in the range from room temperature to isotropic melting temperature. The effects of both magnetic and electric fields on an orientation of the dendrimer were considered. An analysis of diffraction patterns was carried out with the use of paracrystal model of Hosemann. Structural simulation and diffraction calculations ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ some structural parameters during phase transformations were considered. It was determined that the dendrimer has fan-shaped conformation and forms two liquid crystal phases: SmI and N C . The dendrimer does not crystal-lize, but does vitrify with the structure of the previous SmI phase. It was established that the dendrimer can not be oriented either by magnetic field 1,2 T or electrostatic field 2 MV/m. The identification of LC phases and their structure parameters have been confirmed by diffraction calculations. The phase transitions of the dendrimer are G → 55–66 о С → SmI → 101 о С → N С → 274 о С → Iso. The SmI → N С phase transition is the phase transition of mixed order (the phase transition of both the first-order and the second-order). Temperature dependencies of structural parameters in the vicinity of the SmI → N С phase transition and in the vicinity of the region of vitrifying contain features of a two-phase behavior of the dendrimer.","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":"41452844","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: 1

Response of a Hybrid-Aligned Nematic with a Surface Disclination Line to a Magnetic Field Pulse 具有表面倾斜线的混合排列向列对磁场脉冲的响应

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Liquid Crystals and their Application Pub Date : 2021-09-30 DOI: 10.18083/lcappl.2021.3.60

A. M. Parshin

引用次数: 1

Selective Properties of Controlled Reflective Holograms Recorded in a Polymer - Liquid Crystal Composite 聚合物-液晶复合材料中可控反射全息图的选择特性

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Liquid Crystals and their Application Pub Date : 2021-09-30 DOI: 10.18083/lcappl.2021.3.53

G. Zharkova, S. Streltsov

引用次数: 0