Liquid Crystals and their Application最新文献

{"title":"Disorder of DNA Structure in Quasinematic Layers of “Re-entrant” Twisted Phases","authors":"Y. Yevdokimov, S. Skuridin, S. Semenov, V. Salyanov, E. Kats","doi":"10.18083/lcappl.2021.2.54","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.54","url":null,"abstract":"The CD spectra of double-stranded (ds) DNA dispersion particles with the “re-entrant” cholesteric structures formed in poly(ethyleneglycol)-containing solutions are compared. The high osmotic pressure of the solvent results in the dense packing DNA molecules and alteration of their secondary structure as well as a disorder of molecules in quasinematic layers of dispersion particles. Under these conditions, it is impossible to connect the adjacent ds DNA molecules by specific cross-links (nanobridges).","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46554403","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}

{"title":"Synthesis and Pharmaceutical Significant Physical and Chemical Properties of a New Bioactive Fluorine Derivative of Triazol-3-Thione","authors":"S. Blokhina, M. V. Olkhovich, A. Sharapova, E. Zhirova","doi":"10.18083/lcappl.2021.2.35","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.35","url":null,"abstract":"Russia A new fluorine derivative of triazole-3-thione has been synthesized as a potential neuroprotector. The structure and purity of the compound were confirmed by 1 H NMR, 13 C NMR and elemental analysis. The in vitro study of the biological activity of the compound was carried out: the calcium-blocking ability and the effect on the functional activity of AMPA receptors. The shake flask method was used to measure the solubility of the compound in solvents imitating the body's media in the temperature range of 293–313 K. The temperature dependences of the compound solubility were modeled using the Van't Hoff and Apelblat equations. The lipophilicity of the compound was determined and it was concluded that it should have a good intestinal absorption. On the basis of the calculated dissolution and distribution thermodynamic functions, the analysis of the influence of enthalpy  entropy contributions on the Gibbs energy of these processes was carried out. The permeability of the compound through artificial lyotropic phospholipid membranes was studied. It was found that the permeability is sufficient to pass through the body’s biological cell","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42603465","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}

{"title":"Thermodynamic and Optical Properties of Mixtures Based on Mesogenic Dysprosium (III) Complex and Nematic Liquid Crystal","authors":"M. E. Karyakin, A. Kovshik, A. Krupin, L. Dobrun, A. Knyazev, Y. Galyametdinov","doi":"10.18083/lcappl.2021.2.45","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.45","url":null,"abstract":"In this regard, a practically important task is to obtain lanthanide-containing liquid crystal systems exhibiting nematic mesomorphism in a wide temperature range. Therefore, in this work, we have demonstrated the possibility of creating homogeneous nematic mixtures based on the synthesized paramagnetic liquid crystal 5,5'-diheptadecyl-2,2'-bipyridine dysprosium (III) complex with liquid crystal 1-(4-fluorophenyl)-3-(4-(4-propylcyclohexyl)phe-nyl)propane-1,3-dione. The latest possesses wide mesophase range and low crystallization temperature. The phase diagrams of the studied mixtures were constructed using the data of polarizing optical microscopy and differential scanning calorimetry. Their thermodynamic and optical characteristics (main values of refractive indices, optical anisotropy, degree of orientational order) have been studied.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48711128","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}

{"title":"Complex Refractive Indices and Orientation Order of Molecules in Vacuum-Deposited Organic Films","authors":"E. M. Aver’yanov","doi":"10.18083/lcappl.2021.2.82","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.82","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45974678","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}

{"title":"Thin Film Polarizers: Properties, Technologies and Main Types","authors":"V. Kozenkov, V. Belyaev, D. Chausov","doi":"10.18083/lcappl.2021.2.5","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.5","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47658949","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}

{"title":"Anisotropic Derivatives of 6-Aryloxyhexanoic Acid and Nanocomposites on their Base","authors":"V. Bezborodov, A. Finko, S. Mikhalyonok, Y. I. Derikov, G. A. Shandryuk, M. KuzmenokNina, A. S. Arol, O. Karpov, R. Talroze","doi":"10.18083/lcappl.2021.2.24","DOIUrl":"https://doi.org/10.18083/lcappl.2021.2.24","url":null,"abstract":"2'-chloro-4''-(trans-4-butylcyclohexyl)-[1,1':4',1''-terphenyl]-4-ol ( I ), 6-((2'-chloro-4''-(trans-4-butylcyclohexyl)-[1,1':4',1''-terphenyl]-4-yl)oxy)hexanoic acid ( II ) and 8-((2'-chloro-4''-(trans-4-butylcyclohexyl)-[1,1':4',1''-terphenyl]-4-yl)oxy)oct-1-en-3-one ( III ) were used to obtain anisotropic nanocomposites and study their properties. It has been established that these compounds are effective components of anisotropic nanocomposites, including polymeric","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41380629","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}

{"title":"Phthalocyanine And Porphyrin Derivatives Of А3B-Type: Quantum-Chemical Modeling of Dimers","authors":"A. Smirnova, N. Giricheva, K. Soldatova, A. V. Ezhov, E. Glukhovskoy, N. Usol'tseva","doi":"10.18083/LCAPPL.2021.1.50","DOIUrl":"https://doi.org/10.18083/LCAPPL.2021.1.50","url":null,"abstract":"A binary system consisting of a mixture of phthalocyanine (Pc) and porphyrin (P) derivatives of the A 3 B-type was studied by the quantum-chemical method (DFT/B97D/6-311G**). Competition of interactions between components of the mixture is considered. For this purpose, a computer simulation of P and Pc monomer structures, as well as dimers Pc ∙∙∙ Pc, P ∙∙∙ Pc, and P ∙∙∙ P was carried out. Several variations of the geometric structure of dimers of each type (Pc ∙∙∙ Pc, P ∙∙∙ Pc and P ∙∙∙Р ) differing in the mutual orientation of monomers were examined. The values of relative energies and dipole moments of the dimers were calculated. It is shown that during associa-tion of P molecules, their orientation in the supramolecular column P ∙∙∙ P ∙∙∙ P… can be different due to the absence of the preferred direction of resulting dipole moment. In contrast to P, in the Pc ∙∙∙ Pc ∙∙∙ Pc… columns, a predomi-nantly unidirectional arrangement of Pc monomers with the same orientation of dipole moments is formed. Such individual columns can self-arrange into supramolecular mesophase structures with a certain packing of the columns. For the dimers Рс∙∙∙Рс , Р∙∙∙Рс and Р∙∙∙Р the energies of intermolecular interaction were calculated. It was found that Pc molecules form the most stable dimers with the smallest distance between heterocycles and the highest interaction energy between monomers. Therefore, in the equimolecular system of Р and Рс , the Рс∙∙∙Рс∙∙∙Рс … column formation will be more preferable. Experimental miscibility investigation of the studied phthalocyanine and porphyrin derivatives confirmed these theoretical conclusions and showed that after heating and subsequent cooling, the mixture of P and Pc (mo-lar ratio of components 1: 1) separates, i.e. in a condensed bulk state the components do not mix. Therefore, it is not possible to obtain homogeneous thin films by spin-coating method. Nevertheless, the creation of thin film materials based on the studied P and Pc in the form of cascade structures with an extended absorption region of the visible part of the spectrum is possible by the Langmuir-Schaefer method. The frontier orbitals calculation showed that in order to create an optimal cascade-type photovoltaic cell, the studied compounds should be depos-ited onto a substrate according to the lowering of LUMO energy in the following sequence: P / Pc / C 60 .","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46316125","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}

{"title":"Light Modulator Based on Nematic Liquid Crystal with Super-Twisted Structure Operating in Waveguide Mode with Antisymmetric Boundary Conditions","authors":"G. Simonenko","doi":"10.18083/LCAPPL.2021.1.81","DOIUrl":"https://doi.org/10.18083/LCAPPL.2021.1.81","url":null,"abstract":"Using the method of computer simulation, the effect of physical constants of a liquid crystalline (LC) material on integral characteristics of a light modulator was studied. The modulator operated in a waveguide mode in the LC structure with a high twist angle and at antisymmetric boundary conditions of the working cell. It was found that the total response time of the LC modulator is inversely proportional to the square of a control voltage and approaches to a certain constant value when the control voltage tends to infinity. The short total response time of the LC modulator with antisymmetric boundary conditions is presumably conditioned by the absence of a “backflow” in the LC cell when the control voltage is removed and by the fact that only half of the working gap thickness effects the switching dynamics. The optimal set of physical parameters of the LC material was deter-mined, at which the contrast ratio is maximal and the total response time of the modulator is minimal. It was es-tablished that each LC material has its own modulator control mode, and the control voltage value and the method of switching between the “on” and “off” states should be selected based on the physical constants of the LC material and the design parameters of the device.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46272826","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}

{"title":"Influence of Plasma Chemical Treatment of Metallo-Mesogenic Discotic Compounds on their Physico-Chemical Properties","authors":"V. Terentyev, O. Akopova, I. Naumova, V. Titov","doi":"10.18083/LCAPPL.2021.1.61","DOIUrl":"https://doi.org/10.18083/LCAPPL.2021.1.61","url":null,"abstract":"The results of experimental studies of physico-chemical characteristics of metallo-mesogens – copper carboxylates after plasma chemical treatment in the glow discharge plasma of air are presented. After such treatment, the more intense change in the characteristics of the IR spectra was noted in the region of 1400–1600 cm –1 , which is characteristic of oxygen-containing groups. According to polarizing optical microscopy, the decrease in the interval of the columnar mesophase existence is observed for myristate by 17  C, for stearate –by 11  C, and for copper behenate – only by 5  C. This decrease can be explained by a significant screening of carboxylate surface at increasng of the hydrocarbon chain length. On the whole, the plasma-chemical treatment of copper carboxylates did not result to loss of liquid-crystalline properties. The most resistant to such effects was copper begenate, which preserved its thermal and mesomorphic properties practically without changing. The plasma-chemical treatment of copper carboxylates showed a positive effect on tribological (antifriction and anti-wear) properties of lubricants on addition of such metallomesogens to them. It was noted that the friction coefficient was decreased by 1,5–1,9 times and wear of samples was reduced by 1,14–2,0 times. The best tribological performance was observed for lubricants with the addition of plasma pretreated copper behenate. The presented studies make it possible to recommend plasma-chemical treatment in the glow discharge plasma of air to improve tribological characteristics of metal-mesogenic copper carboxylate additives.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"12 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41270753","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}

{"title":"Optimization of Chemical Structure of Compatibilizers Based on Liquid Crystalline Diblock Copolymers for Reconciliation Between Inorganic Quantum Dots and Organic Cholesteric Liquid Crystals","authors":"M. Bugakov, N. Boiko, V. Shibaev","doi":"10.18083/LCAPPL.2021.1.34","DOIUrl":"https://doi.org/10.18083/LCAPPL.2021.1.34","url":null,"abstract":"One of the key challenge of designing hybrid liquid crystalline (LC) materials is to combine organic and inorganic constituents in one stable system. To overcome this challenge, specially designed substances called compatibilizers may be used but the chemical structure of these substances and their content in the system should be adjusted properly. In this work, we optimized the chemical structure and the weight fraction of a compatibilzer between CdSe/ZnS quantum dots (QDs) and low molecular weight cholesteric liquid crystalline (CLC) matrix. As compatibilizers we used LC diblock copolymers containing a mesogenic block consisting of phenyl benzoate monomer units and poly(vinylpyridine) block of different polymerization degree, which is capable of binding to the surface of various nanoparticles. Using polarized optical microscopy and absorbance spectroscopy we found that the polymerization degree of poly(vinylpyridine) block can exert the influence on the CLC matrix properties such as a photonic band gap width and light scattering. The obtained results allowed us to prepare the hybrid CLC materials, which combine the high loading of QDs and unique optical properties of the cholestric phase. Our approach to creation hybrid CLC materials might be employed as a “flexible template” for the design of many other hybrid LC systems.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47390048","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}