Pub Date : 2022-03-31DOI: 10.18083/lcappl.2022.1.27
Y. Galyametdinov, A. Krupin, D. O. Sagdeev, M. E. Karyakin, R. R. Shamilov, A. Knyazev
{"title":"Luminescent Composites Based on Liquid Crystalline Europium(III) Complex and CdSe/CdS/ZnS Quantum Dots","authors":"Y. Galyametdinov, A. Krupin, D. O. Sagdeev, M. E. Karyakin, R. R. Shamilov, A. Knyazev","doi":"10.18083/lcappl.2022.1.27","DOIUrl":"https://doi.org/10.18083/lcappl.2022.1.27","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45118286","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 : 2022-03-31DOI: 10.18083/lcappl.2022.1.56
M. P. Vekovishchev, E. A. Kirsanov
{"title":"Non-Newtonian Flow Of Structured Systems. XXXII. Viscoelasticity of the Solution of Hydrophobically Modified Hydroxyethyl Cellulose","authors":"M. P. Vekovishchev, E. A. Kirsanov","doi":"10.18083/lcappl.2022.1.56","DOIUrl":"https://doi.org/10.18083/lcappl.2022.1.56","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46750471","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 : 2022-03-31DOI: 10.18083/lcappl.2022.1.39
S. Likhomanova, G. Zvereva, N. Kamanina
{"title":"Influence of UV-Radiation on Surface Relief and Properties of 2-Cyclooctylamino-5-Nitropyridine – Fullerene Thin Film For Orientation of Liquid Crystals","authors":"S. Likhomanova, G. Zvereva, N. Kamanina","doi":"10.18083/lcappl.2022.1.39","DOIUrl":"https://doi.org/10.18083/lcappl.2022.1.39","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48572451","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 : 2022-03-31DOI: 10.18083/lcappl.2022.1.89
V. Sutormin, M. Krakhalev, A. Gardymova, O. Prishchepa, I. Timofeev, A. Shabanov, V. Zyryanov
{"title":"Electrically Controlled Ionic Modification of Surface Anchoring in Liquid Crystal Materials","authors":"V. Sutormin, M. Krakhalev, A. Gardymova, O. Prishchepa, I. Timofeev, A. Shabanov, V. Zyryanov","doi":"10.18083/lcappl.2022.1.89","DOIUrl":"https://doi.org/10.18083/lcappl.2022.1.89","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42811228","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 : 2021-12-29DOI: 10.18083/lcappl.2021.4.37
N. Giricheva, I. Lebedev, M. S. Fedorov
. 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.
。采用DFT/B3LYP/cc-pVTZ方法测定了偶氮-、偶氮氧基-、偶氮二氧基苯和偶氮-、偶氮氧基吡啶的反式异构体的几何参数、电子和振动特性，这些异构体可以作为合成单个化合物的前体或具有介形性质的超分子配合物的组分。偶氮-、偶氮氧基和偶氮二氧基桥接基团是苯基和吡啶片段的电子受体。估计了桥接基团中氧原子数对分子性质的影响。计算了苯基和吡啶碎片引起分子平面结构畸变的内旋势函数U(φ)和扭转振动幅值。给出了计算函数U(φ)与- ph - n = N-Ph -片段在晶体稳定构象中的扭转角φ (CCNN)分布图之间的相关性。假设在Ph - n = N-Ph分子中，苯基(Ph)扭振振幅比偶氮氧基和偶氮二氧基分子大，可以预期晶体在较低温度下出现短程无序。对于Ph1 - n (O) -N-Ph2化合物，分子核的不对称性和苯基片段Ph1和Ph2的扭振振幅不同可能是中间相存在温度范围∆Т扩大的原因。得到的参考分子的数据使预测含有研究片段的许多介形化合物的构象性质和结构非刚性成为可能。
{"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}
Pub Date : 2021-12-29DOI: 10.18083/lcappl.2021.4.99
M. Krakhalev, V. Rudyak, V. Sutormin, O. Prishchepa, R. G. Bikbaev, I. Timofeev, K. A. Feyzer, V. Zyryanov
. A brief review of studies on nematic and cholesteric liquid crystals under conical boundary conditions is presented. The most important results on the orientational structures and optical properties of nematic droplets and planar layers of nematic and cholesterics with tangential-conical boundary conditions are briefly described.
{"title":"Liquid Crystal Materials under Conical Boundary Conditions","authors":"M. Krakhalev, V. Rudyak, V. Sutormin, O. Prishchepa, R. G. Bikbaev, I. Timofeev, K. A. Feyzer, V. Zyryanov","doi":"10.18083/lcappl.2021.4.99","DOIUrl":"https://doi.org/10.18083/lcappl.2021.4.99","url":null,"abstract":". A brief review of studies on nematic and cholesteric liquid crystals under conical boundary conditions is presented. The most important results on the orientational structures and optical properties of nematic droplets and planar layers of nematic and cholesterics with tangential-conical boundary conditions are briefly described.","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":"48277808","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 : 2021-12-29DOI: 10.18083/lcappl.2021.4.23
V. Hamplová, Sergei Mironov, Martin Cigl, Zuzana Böhmová, V. Novotná, Alexej Bubnov
. 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.
{"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}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.84
A. Alexandrov, T. V. Pashkova, M. Gruzdev
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.
{"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}
Pub Date : 2021-09-30DOI: 10.18083/lcappl.2021.3.60
A. M. Parshin
{"title":"Response of a Hybrid-Aligned Nematic with a Surface Disclination Line to a Magnetic Field Pulse","authors":"A. M. Parshin","doi":"10.18083/lcappl.2021.3.60","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.60","url":null,"abstract":"","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":"43757190","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 : 2021-09-30DOI: 10.18083/lcappl.2021.3.53
G. Zharkova, S. Streltsov
The selective properties of reflective holograms recorded in a polymer-liquid crystal composite, controlled by mechanical stretching or compression of the hologram have been studied. Based on the theory of diffraction by Kogelnik, an analysis of the effect of mechanical tension and compression of a phase reflective holographic grating across its thickness on the spectral characteristics of the grating is made. A comparative analysis of experimental data and simulation results is carried out. It is shown that when the hologram is mechanically compressed, the wavelength corresponding to the maximum in the reflection spectrum is shifted to the short-wavelength region of the spectrum, and when it is stretched – to the long-wavelength region. The wavelengths of the maximum in the reflection spectrum for the theoretical and experimental dependences corresponding to the same magnitude of compression or tension are proximate. An example of instrumental device using these guided holograms is presented.
{"title":"Selective Properties of Controlled Reflective Holograms Recorded in a Polymer - Liquid Crystal Composite","authors":"G. Zharkova, S. Streltsov","doi":"10.18083/lcappl.2021.3.53","DOIUrl":"https://doi.org/10.18083/lcappl.2021.3.53","url":null,"abstract":"The selective properties of reflective holograms recorded in a polymer-liquid crystal composite, controlled by mechanical stretching or compression of the hologram have been studied. Based on the theory of diffraction by Kogelnik, an analysis of the effect of mechanical tension and compression of a phase reflective holographic grating across its thickness on the spectral characteristics of the grating is made. A comparative analysis of experimental data and simulation results is carried out. It is shown that when the hologram is mechanically compressed, the wavelength corresponding to the maximum in the reflection spectrum is shifted to the short-wavelength region of the spectrum, and when it is stretched – to the long-wavelength region. The wavelengths of the maximum in the reflection spectrum for the theoretical and experimental dependences corresponding to the same magnitude of compression or tension are proximate. An example of instrumental device using these guided holograms is presented.","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":"44893126","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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