Pub Date : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-164-171
S. Rakhmanov, I.B. Tursunov, K. Matyokubov, D. Matrasulov
{"title":"Optical high harmonic generation in a quantum graph","authors":"S. Rakhmanov, I.B. Tursunov, K. Matyokubov, D. Matrasulov","doi":"10.17586/2220-8054-2023-14-2-164-171","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-164-171","url":null,"abstract":"","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"4 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82430832","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-272-278
E. Chernova, K. E. Gurianov, V. Brotsman, R. Valeev, O. Kapitanova, M. V. Berekchiian, A. Lukashin
A BSTRACT A comparative study of transport characteristics of composite membranes based on graphene oxide prepared by Hummers’ (H-GO) and Brodie (B-GO) methods is presented. By using Raman and XPS spectroscopy combined with gas and vapor measurements at non-zero pressure drop, it is shown that the difference in preparation methods results not only in different composition and microstructure of the membranes, but also in different water vapor permeability and resistance towards pressure drops during membrane performance. The H-GO samples are found to be more defective and stronger oxidized with C/O ratio of 1.8, whereas B-GO revealed a total C/O ratio of 2.6 with more perfect microstructure. The higher oxidation degree of H-GO membranes allows one to achieve higher water vapor permeability (up to ∼ 170 Barrer at 100 % humidity) but dramatically lower stability towards pressure revealing the irreversible loss in permeability up to 46 % during the application of pressure drop of 1 bar. In contrast, B-GO membranes show slightly lower permeability ( ∼ 140 Barrer at 100 % humidity) but enhanced pressure stability revealing the irreversible permeability loss of only 4 % at pressure drop of 1 bar which is about 10-fold smaller compared to H-GO stability. This could be explained by the difference in microstructural features of the H-GO and B-GO. Graphene oxide prepared by Hummer’s method has more flexible and defective nanosheets, whereas Brodie’s method gives rise to more rigid nanosheets with more perfect microstructure. The obtained results suggest that it is possible to prepare graphene oxide membranes with high resistance towards pressure using only the composition-microstructure interplay without additional modification with pressure-stabilizing agents.
{"title":"Comparative study of transport properties of membranes based on graphene oxide prepared by Brodie and improved Hummers' methods","authors":"E. Chernova, K. E. Gurianov, V. Brotsman, R. Valeev, O. Kapitanova, M. V. Berekchiian, A. Lukashin","doi":"10.17586/2220-8054-2023-14-2-272-278","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-272-278","url":null,"abstract":"A BSTRACT A comparative study of transport characteristics of composite membranes based on graphene oxide prepared by Hummers’ (H-GO) and Brodie (B-GO) methods is presented. By using Raman and XPS spectroscopy combined with gas and vapor measurements at non-zero pressure drop, it is shown that the difference in preparation methods results not only in different composition and microstructure of the membranes, but also in different water vapor permeability and resistance towards pressure drops during membrane performance. The H-GO samples are found to be more defective and stronger oxidized with C/O ratio of 1.8, whereas B-GO revealed a total C/O ratio of 2.6 with more perfect microstructure. The higher oxidation degree of H-GO membranes allows one to achieve higher water vapor permeability (up to ∼ 170 Barrer at 100 % humidity) but dramatically lower stability towards pressure revealing the irreversible loss in permeability up to 46 % during the application of pressure drop of 1 bar. In contrast, B-GO membranes show slightly lower permeability ( ∼ 140 Barrer at 100 % humidity) but enhanced pressure stability revealing the irreversible permeability loss of only 4 % at pressure drop of 1 bar which is about 10-fold smaller compared to H-GO stability. This could be explained by the difference in microstructural features of the H-GO and B-GO. Graphene oxide prepared by Hummer’s method has more flexible and defective nanosheets, whereas Brodie’s method gives rise to more rigid nanosheets with more perfect microstructure. The obtained results suggest that it is possible to prepare graphene oxide membranes with high resistance towards pressure using only the composition-microstructure interplay without additional modification with pressure-stabilizing agents.","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"72 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84025705","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-254-263
S. Jamdade, P. Tambade, Shivraj Rathod
{"title":"Structural and magnetic study of Tb3+ doped zinc ferrite by sol-gel auto-combustion technique","authors":"S. Jamdade, P. Tambade, Shivraj Rathod","doi":"10.17586/2220-8054-2023-14-2-254-263","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-254-263","url":null,"abstract":"","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"43 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89794246","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-178-185
D. Tupyakov, N. Ivankov, I. Vorontsova, F. Kiselev, V. Egorov
{"title":"Theoretical study of the EDFA optical amplifier implementation scheme improving the performance of a quantum key distribution system integrated with an WDM optical transport network","authors":"D. Tupyakov, N. Ivankov, I. Vorontsova, F. Kiselev, V. Egorov","doi":"10.17586/2220-8054-2023-14-2-178-185","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-178-185","url":null,"abstract":"","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"24 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90120800","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-279-285
A. Alexandrov, A.D. Rezaeva, V. Konyushkin, A. Nakladov, S. V. Kuznetsov, P. Fedorov
{"title":"Features of Ca1-xYxF2+x solid solution heat capacity behavior: diffuse phase transition","authors":"A. Alexandrov, A.D. Rezaeva, V. Konyushkin, A. Nakladov, S. V. Kuznetsov, P. Fedorov","doi":"10.17586/2220-8054-2023-14-2-279-285","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-279-285","url":null,"abstract":"","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"35 10 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72934712","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-202-207
N. Glebova, A. Mazur, A. Krasnova, I. Pleshakov, A. Nechitailov
{"title":"Investigation of stability of composite Nafion/nanocarbon material","authors":"N. Glebova, A. Mazur, A. Krasnova, I. Pleshakov, A. Nechitailov","doi":"10.17586/2220-8054-2023-14-2-202-207","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-202-207","url":null,"abstract":"","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"98 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81128367","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-231-241
Evgeny V. Polyakov, Maria A. Maksimova, Julia V. Kuznetsova, L. Buldakova
A BSTRACT Thermodynamic and experimental studies of Zn(OH) 2 /ZnO particle formation conditions in the model of closed system Zn 2+ –NH 3 ,aq –NH 3 ,gas –H + –OH − –H 2 O–N 2 ,gas (1), which often occurs in the process of synthesis of zinc oxide nanoparticles and films by chemical bath deposition (CBD) methods, were carried out. It was shown that the driving force for the formation and growth of Zn(OH) 2 /ZnO particles in the initially homogeneous system (1) at 25 ◦ C is the difference in the chemical potential of particles at the initial temperature (unsaturated system) and the synthesis temperature (supersaturated system). Using vibrational spectroscopy, X-ray phase and chemical analysis, diffuse light scattering and electrophoresis methods, it was found that the phase transformation of Zn(OH) 2 into ZnO takes place in the region of 85 – 90 ◦ C. The colloid-chemical transformation of Zn(NH 3 ) 2+4 ionic particles into colloidal polycrystals of Zn(OH) 2 /ZnO composition was established for the first time to be a staged process. The first stage of the process in the solution volume is localized at the gas nanobubble-solution interface as a result of rapid formation, growth and removal of gas nanobubbles from the solution. The interaction of positively charged Zn(OH) 2 nanoparticles with the surface of larger negatively charged gas nanobubbles creates colloidal aggregates “bubble || surface film of hydroxide nanoparticles”. Their adhesion forms an openwork foam-like structure of the colloid in the solution and in the film on the interfaces at the first stage of synthesis. After degassing of the electrolyte solution, the second stage develops, consisting of the nucleation and ionic-molecular growth of Zn(OH) 2 /ZnO particles from the supersaturated solution, their distribution between the solution and the electrolyte – reactor wall – air interfaces. The film growth at this stage is regulated by the difference in surface charges of the double electric layer of the interface and polycrystalline colloidal particles. In the solution and on the interface, columnar Zn(OH) 2 /ZnO structures grow as volumetric stars with conical hexagonal spikes
{"title":"Colloidal-chemical mechanism of Zn(OH)2-ZnO layer formation at the glass - ammonia solution - Zn(II) interface","authors":"Evgeny V. Polyakov, Maria A. Maksimova, Julia V. Kuznetsova, L. Buldakova","doi":"10.17586/2220-8054-2023-14-2-231-241","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-231-241","url":null,"abstract":"A BSTRACT Thermodynamic and experimental studies of Zn(OH) 2 /ZnO particle formation conditions in the model of closed system Zn 2+ –NH 3 ,aq –NH 3 ,gas –H + –OH − –H 2 O–N 2 ,gas (1), which often occurs in the process of synthesis of zinc oxide nanoparticles and films by chemical bath deposition (CBD) methods, were carried out. It was shown that the driving force for the formation and growth of Zn(OH) 2 /ZnO particles in the initially homogeneous system (1) at 25 ◦ C is the difference in the chemical potential of particles at the initial temperature (unsaturated system) and the synthesis temperature (supersaturated system). Using vibrational spectroscopy, X-ray phase and chemical analysis, diffuse light scattering and electrophoresis methods, it was found that the phase transformation of Zn(OH) 2 into ZnO takes place in the region of 85 – 90 ◦ C. The colloid-chemical transformation of Zn(NH 3 ) 2+4 ionic particles into colloidal polycrystals of Zn(OH) 2 /ZnO composition was established for the first time to be a staged process. The first stage of the process in the solution volume is localized at the gas nanobubble-solution interface as a result of rapid formation, growth and removal of gas nanobubbles from the solution. The interaction of positively charged Zn(OH) 2 nanoparticles with the surface of larger negatively charged gas nanobubbles creates colloidal aggregates “bubble || surface film of hydroxide nanoparticles”. Their adhesion forms an openwork foam-like structure of the colloid in the solution and in the film on the interfaces at the first stage of synthesis. After degassing of the electrolyte solution, the second stage develops, consisting of the nucleation and ionic-molecular growth of Zn(OH) 2 /ZnO particles from the supersaturated solution, their distribution between the solution and the electrolyte – reactor wall – air interfaces. The film growth at this stage is regulated by the difference in surface charges of the double electric layer of the interface and polycrystalline colloidal particles. In the solution and on the interface, columnar Zn(OH) 2 /ZnO structures grow as volumetric stars with conical hexagonal spikes","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"14 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84272437","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-264-271
N. Leonov, D. Kozlov, D. Kirilenko, N. Bert, A. Pelageikina, A. Nechitailov, M. Alikin, A. Krasilin
A BSTRACT We studied the process of obtaining nanostructured halloysite by varying the parameters for creating the initial composition. The initial composition was synthesized by co-hydrolysis of (C 3 H 7 O) 3 Al and (C 2 H 5 O) 4 Si in the C 6 H 14 –NH 3 · H 2 O system. Aluminum hydrosilicate with the composition Al 2 Si 2 O 5 (OH) 4 was synthesized under hydrothermal conditions (220 ◦ C, 2 MPa, 96 h). Particles of plate-like morphology with average length 100 – 200 nm and 60 nm thickness were obtained. The PXRD patterns revealed the presence of two phases. Plate-like kaolinites are found. Also we observed the formation of a halloysite-like phase. Studies of synthesized samples by IR spectroscopy and thermal analysis revealed the presence of organic-modified hydrosilicate with phase transition around 412 ◦ C. The resulting phase is promising for studying the processes of adsorption and further exfoliation.
{"title":"Formation of a 10 A phase with halloysite structure under hydrothermal conditions with varying initial chemical composition","authors":"N. Leonov, D. Kozlov, D. Kirilenko, N. Bert, A. Pelageikina, A. Nechitailov, M. Alikin, A. Krasilin","doi":"10.17586/2220-8054-2023-14-2-264-271","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-264-271","url":null,"abstract":"A BSTRACT We studied the process of obtaining nanostructured halloysite by varying the parameters for creating the initial composition. The initial composition was synthesized by co-hydrolysis of (C 3 H 7 O) 3 Al and (C 2 H 5 O) 4 Si in the C 6 H 14 –NH 3 · H 2 O system. Aluminum hydrosilicate with the composition Al 2 Si 2 O 5 (OH) 4 was synthesized under hydrothermal conditions (220 ◦ C, 2 MPa, 96 h). Particles of plate-like morphology with average length 100 – 200 nm and 60 nm thickness were obtained. The PXRD patterns revealed the presence of two phases. Plate-like kaolinites are found. Also we observed the formation of a halloysite-like phase. Studies of synthesized samples by IR spectroscopy and thermal analysis revealed the presence of organic-modified hydrosilicate with phase transition around 412 ◦ C. The resulting phase is promising for studying the processes of adsorption and further exfoliation.","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"64 2 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90944790","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 : 2023-04-29DOI: 10.17586/2220-8054-2023-14-2-242-253
M. Lomakin, O. Proskurina, V. Gusarov
{"title":"Pyrochlore phase in the Bi2O3-Fe2O3-WO3-(H2O) system: its formation by hydrothermal synthesis in the low-temperature region of the phase diagram","authors":"M. Lomakin, O. Proskurina, V. Gusarov","doi":"10.17586/2220-8054-2023-14-2-242-253","DOIUrl":"https://doi.org/10.17586/2220-8054-2023-14-2-242-253","url":null,"abstract":"","PeriodicalId":18782,"journal":{"name":"Nanosystems: Physics, Chemistry, Mathematics","volume":"31 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76045247","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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