Pub Date : 2021-09-05DOI: 10.1109/NAP51885.2021.9568604
A. Goltsev, N. Babenko, M. Bondarovych, T. Dubrava, Yuliia Gaevska, V. Klochkov
This research comparatively studies the influence of different concentrations of spherical gadolinium-yttrium orthovanadate nanoparticles (GdYEuVO4) on a functional potential of Ehrlich carcinoma cancer and hematopoietic stem cells of healthy animals. Confocal microscopy data indicate the ability of nanoparticles at a concentration of 0.87 and 1.3 g / L to visualize the cells of tumor and those of healthy bone marrow; however, the intensity of their accumulation in myelokaryocytes was significantly lower than in Ehrlich carcinoma cells. It was shown that nanoparticles in both concentrations had the ability to inhibit the functional potential of both transformed and hematopoietic stem cells, but in the latter this was observed to a much lesser extent. Nanoparticles at a concentration of 1.3 g / L maximally reduced the metabolic activity of Ehrlich carcinoma cells and promoted an inhibition of tumor growth, while slightly altering the functional potential of hematopoietic stem cells.
本研究比较研究了不同浓度的球形钒酸钆钇纳米颗粒(gdyuvo4)对健康动物埃利希癌和造血干细胞功能电位的影响。共聚焦显微镜数据表明，浓度分别为0.87和1.3 g / L的纳米颗粒能够显示肿瘤细胞和健康骨髓细胞;然而，它们在骨髓细胞中的积累强度明显低于在埃利希癌细胞中的积累强度。研究表明，两种浓度的纳米颗粒都有抑制转化干细胞和造血干细胞功能潜能的能力，但在造血干细胞中，这种抑制程度要小得多。浓度为1.3 g / L的纳米颗粒最大限度地降低了埃利希癌细胞的代谢活性，促进了肿瘤生长的抑制，同时轻微改变了造血干细胞的功能潜能。
{"title":"Orthovanadate-Based Nanoparticles: Differences in Functional Activity of Cancer and Hematopoietic Stem Cells","authors":"A. Goltsev, N. Babenko, M. Bondarovych, T. Dubrava, Yuliia Gaevska, V. Klochkov","doi":"10.1109/NAP51885.2021.9568604","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568604","url":null,"abstract":"This research comparatively studies the influence of different concentrations of spherical gadolinium-yttrium orthovanadate nanoparticles (GdYEuVO4) on a functional potential of Ehrlich carcinoma cancer and hematopoietic stem cells of healthy animals. Confocal microscopy data indicate the ability of nanoparticles at a concentration of 0.87 and 1.3 g / L to visualize the cells of tumor and those of healthy bone marrow; however, the intensity of their accumulation in myelokaryocytes was significantly lower than in Ehrlich carcinoma cells. It was shown that nanoparticles in both concentrations had the ability to inhibit the functional potential of both transformed and hematopoietic stem cells, but in the latter this was observed to a much lesser extent. Nanoparticles at a concentration of 1.3 g / L maximally reduced the metabolic activity of Ehrlich carcinoma cells and promoted an inhibition of tumor growth, while slightly altering the functional potential of hematopoietic stem cells.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90286313","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568515
P. Demydov, V. Lytvyn, A. Lopatynskyi, I. I. Hudzenko, V. Chegel
In this work, a complex time resolved study of gold nanoshell synthesis using silver-gold galvanic replacement reaction was carried out. Sequential extraction of the synthesis fragments on each stage of the nanoshells preparation allowed us to obtain a series of nanostructures, each one with its own unique geometrical and optical properties. Nanostructures that were isolated on the initial synthesis stages are mostly bimetallic spherical formations, which transform into solid nanoshells on the last stage of the reaction and further into spheroidal assemblies of separate nanostructures. Step by step research of nanostructures at each stage shows the ability of smooth LSPR spectrum nano tuning in the range from 400 to 720 nm.
{"title":"LSPR Tuning by Variable Morphology of Gold Nanoshells","authors":"P. Demydov, V. Lytvyn, A. Lopatynskyi, I. I. Hudzenko, V. Chegel","doi":"10.1109/NAP51885.2021.9568515","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568515","url":null,"abstract":"In this work, a complex time resolved study of gold nanoshell synthesis using silver-gold galvanic replacement reaction was carried out. Sequential extraction of the synthesis fragments on each stage of the nanoshells preparation allowed us to obtain a series of nanostructures, each one with its own unique geometrical and optical properties. Nanostructures that were isolated on the initial synthesis stages are mostly bimetallic spherical formations, which transform into solid nanoshells on the last stage of the reaction and further into spheroidal assemblies of separate nanostructures. Step by step research of nanostructures at each stage shows the ability of smooth LSPR spectrum nano tuning in the range from 400 to 720 nm.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"262 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73556185","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568620
A. Kalinichenko, V. Strel’nitskij
Within the framework of the model of the nonlocal thermoelastic peak of the low-energy ion, the formation of intrinsic stress in the DLC deposited from the flow of $C^{+}$ ions of the filtered vacuum arc plasma is theoretically investigated. The dependence of intrinsic stress on the bias potential is determined at different deposition temperatures for the cases of constant and pulse potentials. It is shown that in both cases considered, the stresses decrease with the increase in the deposition temperature. The influence of the filling parameter in the mode of pulse potential on the behavior of intrinsic stresses at different bias potentials is investigated. The results of calculation the sputtering coefficients of the DLC depending on the potential at different angles of incidence of ions are presented. The influence of the sputtering process on the growth rate of DLC in the cases of DC-mode and mode of pulse potential is analyzed.
{"title":"Effect of Ion Bombardment and Deposition Temperature on Intrinsic Stress and Growth Rate of DLC","authors":"A. Kalinichenko, V. Strel’nitskij","doi":"10.1109/NAP51885.2021.9568620","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568620","url":null,"abstract":"Within the framework of the model of the nonlocal thermoelastic peak of the low-energy ion, the formation of intrinsic stress in the DLC deposited from the flow of $C^{+}$ ions of the filtered vacuum arc plasma is theoretically investigated. The dependence of intrinsic stress on the bias potential is determined at different deposition temperatures for the cases of constant and pulse potentials. It is shown that in both cases considered, the stresses decrease with the increase in the deposition temperature. The influence of the filling parameter in the mode of pulse potential on the behavior of intrinsic stresses at different bias potentials is investigated. The results of calculation the sputtering coefficients of the DLC depending on the potential at different angles of incidence of ions are presented. The influence of the sputtering process on the growth rate of DLC in the cases of DC-mode and mode of pulse potential is analyzed.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"63 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78544171","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568619
Y. Husak, Kateryna Zaitseva, A. Turlybekuly, K. Diedkova, M. Sliusarenko, Illya Yanko, S. Kyrylenko, A. Pogrebnjak, W. Simka, M. Pogorielov
Osteocompatibility of orthopedic implants can be enhanced by surface bioactivation and by providing biomimetic architecture. Selective laser melting (SLM) is used to produce scaffold materials with ameliorated topology to meet the requirements of the load-bearing function of a bone tissue. Both macro- and micro levels were considered to achieve these goals. Mineralization of the implant surfaces improves cell attachment and spreading. Treatment of Ti6Al4V implant with sodium hydroxide resulted in a titanate surface layer with well-developed nanostructure. Additional surface treatment can be used to improve the biological properties of the SLM-fabricated porous scaffolds.
{"title":"Ti6Al4V Scaffolds with Alkali Activated Surfaces for Tissue Engineering","authors":"Y. Husak, Kateryna Zaitseva, A. Turlybekuly, K. Diedkova, M. Sliusarenko, Illya Yanko, S. Kyrylenko, A. Pogrebnjak, W. Simka, M. Pogorielov","doi":"10.1109/NAP51885.2021.9568619","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568619","url":null,"abstract":"Osteocompatibility of orthopedic implants can be enhanced by surface bioactivation and by providing biomimetic architecture. Selective laser melting (SLM) is used to produce scaffold materials with ameliorated topology to meet the requirements of the load-bearing function of a bone tissue. Both macro- and micro levels were considered to achieve these goals. Mineralization of the implant surfaces improves cell attachment and spreading. Treatment of Ti6Al4V implant with sodium hydroxide resulted in a titanate surface layer with well-developed nanostructure. Additional surface treatment can be used to improve the biological properties of the SLM-fabricated porous scaffolds.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"67 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79261341","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568574
K. Avdeeva, A. Shumskaya, Zh. B. Ignatovich, A. Rogachev, V. Agabekov, M. Yarmolenko, Aleksey Mikhalko, Nataliya Dudchik, A. Oleynik
Polymer nonwoven materials based on polypropylene are the basis for the creation of protective medical masks. Modification of the filter layers has been performed by electron-beam deposition from the active gas phase formed by the electron-beam dispersion of PTFE. The filtration efficiency was investigated by two indicators: the PFE with a diameter of 2.5 $mu$m (PM2.5), BFE in accordance with GOST R 58396-2019 for three-layer combinations of nonwovens, the inner layer of which had a modified coating. An increase in the filtration efficiency for both indicators was observed for all samples, which is associated with physicochemical changes of the surface of the active layer.
以聚丙烯为基础的高分子非织造材料是制造防护医用口罩的基础。利用聚四氟乙烯的电子束色散形成的活性气相进行电子束沉积，对滤层进行了改性。通过两项指标考察过滤效率:直径为2.5 μ m (PM2.5)的PFE和符合GOST R 58396-2019的三层非织造布组合的BFE，内层有改性涂层。两种指标的过滤效率在所有样品中都有所提高，这与活性层表面的物理化学变化有关。
{"title":"Modified Polypropylene Fibrous Nonwoven Materials","authors":"K. Avdeeva, A. Shumskaya, Zh. B. Ignatovich, A. Rogachev, V. Agabekov, M. Yarmolenko, Aleksey Mikhalko, Nataliya Dudchik, A. Oleynik","doi":"10.1109/NAP51885.2021.9568574","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568574","url":null,"abstract":"Polymer nonwoven materials based on polypropylene are the basis for the creation of protective medical masks. Modification of the filter layers has been performed by electron-beam deposition from the active gas phase formed by the electron-beam dispersion of PTFE. The filtration efficiency was investigated by two indicators: the PFE with a diameter of 2.5 $mu$m (PM2.5), BFE in accordance with GOST R 58396-2019 for three-layer combinations of nonwovens, the inner layer of which had a modified coating. An increase in the filtration efficiency for both indicators was observed for all samples, which is associated with physicochemical changes of the surface of the active layer.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"28 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84334692","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568511
G. Dudok, N. Semenyuk, Kh. V. Kysil, I. Ilkiv, V. Skorokhoda
The influence of technological factors on the regularities of obtaining silver nanoparticles using polyvinylpyrrolidone as a reducing agent and stabilizer has been studied. The chemistry of the reaction of silver obtaining by the reduction reaction with polyvinylpyrrolidone has been proposed. The mechanism of chemical reaction of silver nanoparticles obtaining in the presence of polyvinylpyrrolidone has been proposed. The formation of silver nanoparticles was confirmed by UV spectroscopy and transmission electron microscopy. The effect of temperature, ratio and reagents concentration on the kinetics of silver ions reduction has been established. Particles with a smaller diameter are formed in the case of the use of PVP with a higher molecular weight. Silver-containing composites in the form of porous blocks and films were synthesized and their antibacterial and antifungal properties were investigated. Developed porous composites are recommended to be used in medicine as osteoplastic to replace damaged bone tissue.
{"title":"Regularities of Obtaining Silver Nanoparticles in the Presence of Polyvinylpyrrolidone","authors":"G. Dudok, N. Semenyuk, Kh. V. Kysil, I. Ilkiv, V. Skorokhoda","doi":"10.1109/NAP51885.2021.9568511","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568511","url":null,"abstract":"The influence of technological factors on the regularities of obtaining silver nanoparticles using polyvinylpyrrolidone as a reducing agent and stabilizer has been studied. The chemistry of the reaction of silver obtaining by the reduction reaction with polyvinylpyrrolidone has been proposed. The mechanism of chemical reaction of silver nanoparticles obtaining in the presence of polyvinylpyrrolidone has been proposed. The formation of silver nanoparticles was confirmed by UV spectroscopy and transmission electron microscopy. The effect of temperature, ratio and reagents concentration on the kinetics of silver ions reduction has been established. Particles with a smaller diameter are formed in the case of the use of PVP with a higher molecular weight. Silver-containing composites in the form of porous blocks and films were synthesized and their antibacterial and antifungal properties were investigated. Developed porous composites are recommended to be used in medicine as osteoplastic to replace damaged bone tissue.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"11 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82027946","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568517
V. A. Nikolaenko, A. Smorodin, S. Sokolov
The carry features of a quasi-one-dimensional surface electrons (Q1D-SEs) over the superfluid helium at the charged profiled substrate is investigated by the transport method. Substrate is row the optical fiber segments. The experiments carried out in temperature range 1.5 K-0.6 K at electron densities up to 109 cm-2. According a phase diagram “electron gas - Wigner crystal” research performed in the electron gas region at temperature higher the Fermi energy and at electron density far “quantum melting». The substrate electrostatic model in the electric field demonstrates the potential modulation in the cross section lets to charge the fiber tops increasing thereby the Q1D-SE potential well. The surface electrons motion satisfies the quantization condition in view both the temperature and the electron relaxation time. Lower of some temperature the conductivity is a steps-like and it differential is a peaks-like simile to the electron states density with the peak distance according energy spectrum. Pronounced steps at lowering temperature can be caused the electron density redistribution on the energy levels and the SEs thermo-activation motion near the channel bounders.
{"title":"Quantization Conductivity of Surface Electrons over Superfluid Helium at the Charged Substrate Channels","authors":"V. A. Nikolaenko, A. Smorodin, S. Sokolov","doi":"10.1109/NAP51885.2021.9568517","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568517","url":null,"abstract":"The carry features of a quasi-one-dimensional surface electrons (Q1D-SEs) over the superfluid helium at the charged profiled substrate is investigated by the transport method. Substrate is row the optical fiber segments. The experiments carried out in temperature range 1.5 K-0.6 K at electron densities up to 109 cm-2. According a phase diagram “electron gas - Wigner crystal” research performed in the electron gas region at temperature higher the Fermi energy and at electron density far “quantum melting». The substrate electrostatic model in the electric field demonstrates the potential modulation in the cross section lets to charge the fiber tops increasing thereby the Q1D-SE potential well. The surface electrons motion satisfies the quantization condition in view both the temperature and the electron relaxation time. Lower of some temperature the conductivity is a steps-like and it differential is a peaks-like simile to the electron states density with the peak distance according energy spectrum. Pronounced steps at lowering temperature can be caused the electron density redistribution on the energy levels and the SEs thermo-activation motion near the channel bounders.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"62 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79677820","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568569
Yu. S. Yapontseva, T. Maltseva, V. Kublanovsky
This work presents a comparative analysis of the chemical and phase composition, current efficiency, and microhardness of binary and ternary electrolytic CoRe and CoWRe alloys, deposited from two types of electrolytes: acidic citrate and alkaline citrate-pyrophosphate ones. It has been shown that the use of electrolytes of various complexes compositions makes it possible to vary the amount of rhenium in the coatings over a wide range (12 – 59 at.%). Ternary CoWRe alloys contain 4 – 9 at.% of tungsten, and they are deposited with higher current efficiency (up to 86%) than binary alloys. By selecting the composition of the electrolyte and the electrolysis mode, it is possible to regulate not only the chemical composition but also the structure of the coatings and to obtain X-ray amorphous or crystalline alloys, depending on the task.
{"title":"Electrodeposition of Binary and Ternary Rhenium Alloys","authors":"Yu. S. Yapontseva, T. Maltseva, V. Kublanovsky","doi":"10.1109/NAP51885.2021.9568569","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568569","url":null,"abstract":"This work presents a comparative analysis of the chemical and phase composition, current efficiency, and microhardness of binary and ternary electrolytic CoRe and CoWRe alloys, deposited from two types of electrolytes: acidic citrate and alkaline citrate-pyrophosphate ones. It has been shown that the use of electrolytes of various complexes compositions makes it possible to vary the amount of rhenium in the coatings over a wide range (12 – 59 at.%). Ternary CoWRe alloys contain 4 – 9 at.% of tungsten, and they are deposited with higher current efficiency (up to 86%) than binary alloys. By selecting the composition of the electrolyte and the electrolysis mode, it is possible to regulate not only the chemical composition but also the structure of the coatings and to obtain X-ray amorphous or crystalline alloys, depending on the task.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"177 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80678959","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568573
Oleh Shtanko, O. Prokopenko
Terahertz-frequency (TF) signals have a great potential for applications in medicine, security, communications, etc., but many of these applications require the development of compact, reliable and rather powerful sources of coherent TF signals, which are able to operate in the absence of cryogenic temperatures, strong bias magnetic fields and large bias voltages. One of the promising types of such sources can be a source utilizing an array of synchronized antiferromagnetic (AFM) spin Hall oscillators (SHOs). In this paper we theoretically and numerically study electrodynamic properties of a TF source based on a high-quality dielectric resonator with embedded current-biased mutually synchronized AFM SHOs, where an AFM layer of each SHO is made of a canted AFM with non-zero net magnetization. Since the location of AFM SHOs inside the resonator has influence on the excitation conditions of resonator’s oscillation modes, we study an impact of AFM SHO array spatial configuration on the performance of considered TF source and find optimum spatial configuration of the SHOs array for different excited E- and H-modes. The obtained results could be important for the development of novel micro- and nano-scale TF signal sources based on antiferromagnets.
{"title":"Terahertz-Frequency Signal Source Based on an Array of Synchronized Antiferromagnetic Spin Hall Oscillators","authors":"Oleh Shtanko, O. Prokopenko","doi":"10.1109/NAP51885.2021.9568573","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568573","url":null,"abstract":"Terahertz-frequency (TF) signals have a great potential for applications in medicine, security, communications, etc., but many of these applications require the development of compact, reliable and rather powerful sources of coherent TF signals, which are able to operate in the absence of cryogenic temperatures, strong bias magnetic fields and large bias voltages. One of the promising types of such sources can be a source utilizing an array of synchronized antiferromagnetic (AFM) spin Hall oscillators (SHOs). In this paper we theoretically and numerically study electrodynamic properties of a TF source based on a high-quality dielectric resonator with embedded current-biased mutually synchronized AFM SHOs, where an AFM layer of each SHO is made of a canted AFM with non-zero net magnetization. Since the location of AFM SHOs inside the resonator has influence on the excitation conditions of resonator’s oscillation modes, we study an impact of AFM SHO array spatial configuration on the performance of considered TF source and find optimum spatial configuration of the SHOs array for different excited E- and H-modes. The obtained results could be important for the development of novel micro- and nano-scale TF signal sources based on antiferromagnets.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"31 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80900133","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 : 2021-09-05DOI: 10.1109/NAP51885.2021.9568631
Y. Pashkevich, Vladimir Gnezdiov, D. Vieira, R. Babkin, Irina M. Lukienko, J. Vieira, D. Wulferding, P. Lemmens, A. Salak
The variations of Raman and optic absorption spectra of Co-Al layered double hydroxides (LDH) intercalated with nitrate and carbonate anions have been studied as a function of the $Co^{2+}/A1^{3+}$ ratio. It was revealed from the comparative analysis of the hydrogen bond frequencies in Raman spectra and the phonon repetition lines in optic absorption spectra that the increasing $Co^{2+}/A1^{3+}$ ratio results in an enhancement of the anion exchange ability in nitrate LDH and in a suppression of the ability in carbonate LDH.
{"title":"Comparative Optic Studies of Cobalt-Based Layered Double Hydroxides with Nitrate and Carbonate Anions and CoII/A1III ratio n = 2, 3, 4","authors":"Y. Pashkevich, Vladimir Gnezdiov, D. Vieira, R. Babkin, Irina M. Lukienko, J. Vieira, D. Wulferding, P. Lemmens, A. Salak","doi":"10.1109/NAP51885.2021.9568631","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568631","url":null,"abstract":"The variations of Raman and optic absorption spectra of Co-Al layered double hydroxides (LDH) intercalated with nitrate and carbonate anions have been studied as a function of the $Co^{2+}/A1^{3+}$ ratio. It was revealed from the comparative analysis of the hydrogen bond frequencies in Raman spectra and the phonon repetition lines in optic absorption spectra that the increasing $Co^{2+}/A1^{3+}$ ratio results in an enhancement of the anion exchange ability in nitrate LDH and in a suppression of the ability in carbonate LDH.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"87 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83427870","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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