Pub Date : 2023-09-29DOI: 10.18083/lcappl.2023.3.77
Yuriy N. Timoshin, Еvgeniy A. Kirsanov
Structural rheological model is used to describe the rheological behavior of hydrolyzed polyacrylamide aqueous solutions. The change in viscosity during stationary flow is explained by structure change of the polymer solution associated with contacts between macromolecules. Flow curves are well approximated by the generalized flow equation, except for the region of high shear rates, where the phenomenon of shear thickening is observed. The behavior of the rheological equation coefficients with a change in the polymer concentration is consistent with the conclusions of the structural rheological model.
{"title":"Non-Newtonian Flow of Hydrolyzed Polyacrylamide Solution","authors":"Yuriy N. Timoshin, Еvgeniy A. Kirsanov","doi":"10.18083/lcappl.2023.3.77","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.77","url":null,"abstract":"Structural rheological model is used to describe the rheological behavior of hydrolyzed polyacrylamide aqueous solutions. The change in viscosity during stationary flow is explained by structure change of the polymer solution associated with contacts between macromolecules. Flow curves are well approximated by the generalized flow equation, except for the region of high shear rates, where the phenomenon of shear thickening is observed. The behavior of the rheological equation coefficients with a change in the polymer concentration is consistent with the conclusions of the structural rheological model.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"2015 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":"135193765","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.2023.3.66
Sergey I. Trashkeev, Pavel A. Statsenko, Maksim N. Khomyakov, Sergey A. Shvetsov
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.
{"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}
Pub Date : 2023-09-29DOI: 10.18083/lcappl.2023.3.5
Аntonina I. Smirnova, Nina I. Giricheva, Elena A. Lapykina, Nadezhda V. Usol'tseva
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.
采用偏光显微镜、红外光谱等实验方法，研究了4-十二烷基氧基苯甲酸(BA)和4-(4-烷氧基苯偶氮)苯腈(BN-n, n = 8,10,12)组成的双组分体系。根据BN-n的烷基取代基长度确定了体系的中间相存在范围。采用DFT/B97D/6-311++G**方法分析了- cooh··NC -氢键异二聚物的形成可能性和稳定性。在所有得到的等摩尔BN-n:BA(1:1)体系中，均诱导了SmA相，并在较宽的温度范围内表现为对向性。计算机模拟表明，与同型二聚体不同，预期的BN···BA h -配合物具有角结构，不能保证SmA相的形成。为了阐明BN-n:BA体系中中间相形成的机理，我们计算了同二聚体和异二聚体的分子间相互作用能量，并分析了等摩尔BN-n:BA体系的实验红外光谱。光谱由BN···BN和BA··BA环二聚体的光谱叠加而成。因此，我们认为BN···BA型h -配合物不能在等摩尔BN-n:BA混合物中形成。相反，形成了由BA··BA二聚体和BN··BN缔合物交替层组成的结构。酸二聚体的层在SmA相的形成中起主要作用。值得注意的是，- cooh基团与- nh2、- nh1、- oh等质子供体基团不同，不与质子受体- cn基团形成氢键。
{"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}
Pub Date : 2023-09-29DOI: 10.18083/lcappl.2023.3.98
Anastasiia A. Vasileva, Sergey V. Pasechnik
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.
{"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}
Pub Date : 2023-09-29DOI: 10.18083/lcappl.2023.3.46
Semen S. Kharlamov, Dina V. Shmeliova, Sergey V. Pasechnik, A. V. Zakharov
{"title":"Electrically Driven Kink-Like Distortion Waves in Liquid Crystals","authors":"Semen S. Kharlamov, Dina V. Shmeliova, Sergey V. Pasechnik, A. V. Zakharov","doi":"10.18083/lcappl.2023.3.46","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.46","url":null,"abstract":"","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"111 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":"135193961","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.2023.3.54
A. E. Burakov, T. S. Kuznetsova, I. V. Burakova, O. A. Ananyeva, E. S. Mkrtchyan, T. P. Dyachkova, A. G. Tkachev
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.
{"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}
Pub Date : 2023-09-29DOI: 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
Analysis of the experimentally established transmission variation (taking into account the transparency increasing) of polyvinyl alcohol thin films sensitized with graphene oxide of different concentrations was performed. The mechanical features of these solid-state compositions were studied. Transmission spectra in the visible and near-infrared ranges were registered. The microhardness of the studied materials was measured. The experimental results were confirmed by the quantum chemical modeling. A wide range of possible applications of the studied materials is proposed: display technology, light modulators, laser radiation converters, output windows of optoelectronic devices, biomedicine.
{"title":"Effect of Transparency Increasing and Surface Relief of Polyvinyl Alcohol Thin Films with Graphene Oxide of Varied Concentrations: Possible Applications","authors":"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","doi":"10.18083/lcappl.2023.3.87","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.87","url":null,"abstract":"Analysis of the experimentally established transmission variation (taking into account the transparency increasing) of polyvinyl alcohol thin films sensitized with graphene oxide of different concentrations was performed. The mechanical features of these solid-state compositions were studied. Transmission spectra in the visible and near-infrared ranges were registered. The microhardness of the studied materials was measured. The experimental results were confirmed by the quantum chemical modeling. A wide range of possible applications of the studied materials is proposed: display technology, light modulators, laser radiation converters, output windows of optoelectronic devices, biomedicine.","PeriodicalId":18138,"journal":{"name":"Liquid Crystals and their Application","volume":"49 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":"135193757","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.2023.3.23
O. N. Karpov, Ya. I. Derikov, A. V. Finko, A. I. Saveliev, S. G. Mikhalyonok, N. M. Kuzmenok, V. S. Bezborodov, R. V. Talroze
An important aspect of modern materials science, namely the possibility of combining inorganic nanoparticles and liquid crystals in composite materials is discussed. These systems make it possible to combine liquid crystal properties of matrix and luminescent properties of quantum dots. A five-component mixture consisting mainly of 4-cyanobiphenyl derivatives used as a matrix. The substitution of ligands formed during the synthesis of quantum dots with derivatives of organic acids is shown. Using two new optically active ligands, the chiralization of the nematic matrix was demonstrated by introducing quantum dots into it.
{"title":"Introduction of CdSe/ZnS Quantum Dots into Liquid Crystalline Matrix","authors":"O. N. Karpov, Ya. I. Derikov, A. V. Finko, A. I. Saveliev, S. G. Mikhalyonok, N. M. Kuzmenok, V. S. Bezborodov, R. V. Talroze","doi":"10.18083/lcappl.2023.3.23","DOIUrl":"https://doi.org/10.18083/lcappl.2023.3.23","url":null,"abstract":"An important aspect of modern materials science, namely the possibility of combining inorganic nanoparticles and liquid crystals in composite materials is discussed. These systems make it possible to combine liquid crystal properties of matrix and luminescent properties of quantum dots. A five-component mixture consisting mainly of 4-cyanobiphenyl derivatives used as a matrix. The substitution of ligands formed during the synthesis of quantum dots with derivatives of organic acids is shown. Using two new optically active ligands, the chiralization of the nematic matrix was demonstrated by introducing quantum dots into it.","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":"135194078","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 : 2023-06-29DOI: 10.18083/lcappl.2023.2.29
O. V. Maltсeva, K. Nikitin, A. Kazak, N. Mamardashvili, N. Usol'tseva
floating layers were modeled and the geometric characteristics of molecular packings on water surface were calculated. It was shown that the area per molecule in the dense face-on packing of a monolayer is 1.69 nm 2 , and in the edge-on packing – 0.90 nm 2 . Analysis of the floating layer compression isotherm revealed that ZnTPP molecules are arranged face-on to the interface plane. Electron absorption spectroscopy showed that LS-films contain aggregates of J-type. The surface morphology of LS-films studied by AFM revealed that the average roughness of LS-films increases by 1.4 times with an increase in the number of transfers from one to five. The sensing properties of the LS-films (with 15 transfers) with respect to hydroxypyridine and pyridine in aqueous and gaseous media, correspondingly, have been studied. It was established that the LS-film is sensitive to pyridine vapors. The results obtained can be used to create selective sensors for environmental pollution monitoring
{"title":"Sensing Ability of Zn-Tetraphenylporphyrin Langmuir-Schaefer Films","authors":"O. V. Maltсeva, K. Nikitin, A. Kazak, N. Mamardashvili, N. Usol'tseva","doi":"10.18083/lcappl.2023.2.29","DOIUrl":"https://doi.org/10.18083/lcappl.2023.2.29","url":null,"abstract":"floating layers were modeled and the geometric characteristics of molecular packings on water surface were calculated. It was shown that the area per molecule in the dense face-on packing of a monolayer is 1.69 nm 2 , and in the edge-on packing – 0.90 nm 2 . Analysis of the floating layer compression isotherm revealed that ZnTPP molecules are arranged face-on to the interface plane. Electron absorption spectroscopy showed that LS-films contain aggregates of J-type. The surface morphology of LS-films studied by AFM revealed that the average roughness of LS-films increases by 1.4 times with an increase in the number of transfers from one to five. The sensing properties of the LS-films (with 15 transfers) with respect to hydroxypyridine and pyridine in aqueous and gaseous media, correspondingly, have been studied. It was established that the LS-film is sensitive to pyridine vapors. The results obtained can be used to create selective sensors for environmental pollution monitoring","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":"45018393","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 : 2023-06-29DOI: 10.18083/lcappl.2023.2.38
M. P. Vekovishchev, E. A. Kirsanov
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.
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