Pub Date : 2021-09-05DOI: 10.1109/NAP51885.2021.9568558
N. Andrushchak, V. Adamiv, V. Haiduchok, I. Teslyuk, Y. Yashchyshyn, A. Andrushchak
In this paper, the modified technology of nanoporous aluminum oxide (Al2O3) matrices filling with the KDP, ADP, and TGS crystals is proposed. The transmission spectra of the grown structures were studied at 300 -3000 nm and 50-1200 GHz spectral ranges. Because of the performed investigation, due to the significant transmission of nanoporous matrices in the terahertz range, in-depth analysis needs to be performed for their use as substrates for the implementation of nanoplasmonic devices, given the regular (periodic) structure of nanopores in these matrices.
{"title":"Transmission Spectra Investigation of Nanoporous Al2O3 Matrices Filled with KDP, ADP and TGS Crystals at Visible, NIR, and SubTerahertz Ranges","authors":"N. Andrushchak, V. Adamiv, V. Haiduchok, I. Teslyuk, Y. Yashchyshyn, A. Andrushchak","doi":"10.1109/NAP51885.2021.9568558","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568558","url":null,"abstract":"In this paper, the modified technology of nanoporous aluminum oxide (Al2O3) matrices filling with the KDP, ADP, and TGS crystals is proposed. The transmission spectra of the grown structures were studied at 300 -3000 nm and 50-1200 GHz spectral ranges. Because of the performed investigation, due to the significant transmission of nanoporous matrices in the terahertz range, in-depth analysis needs to be performed for their use as substrates for the implementation of nanoplasmonic devices, given the regular (periodic) structure of nanopores in these matrices.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"41 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":"89587868","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/NAP51885.2021.9568589
N. Atamas, D. Gavryushenko, G. Taranyk, V. Kashchenko
The correct method for the determination of the structure of water-alcohol solution at different concentration by using Monte Carlo (MC) simulation ware developed and was used to study of aqueous solution of propanol. It was found that at the concentrations lower than $X_{pr} sim 0.04$ mole propanol molecules do not influence on the physical-chemical properties of water in water-propanol solution; at the concentration $X_{pr} sim 0.2$ mole the fluctuations in the form of the clusters of propanol molecules at concentration was determined; at the concentration range $X_{pr} sim (0.3-0.38)$ mole propanol molecules form the micelles.
{"title":"Clustering in Water-Propanol Solutions","authors":"N. Atamas, D. Gavryushenko, G. Taranyk, V. Kashchenko","doi":"10.1109/NAP51885.2021.9568589","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568589","url":null,"abstract":"The correct method for the determination of the structure of water-alcohol solution at different concentration by using Monte Carlo (MC) simulation ware developed and was used to study of aqueous solution of propanol. It was found that at the concentrations lower than $X_{pr} sim 0.04$ mole propanol molecules do not influence on the physical-chemical properties of water in water-propanol solution; at the concentration $X_{pr} sim 0.2$ mole the fluctuations in the form of the clusters of propanol molecules at concentration was determined; at the concentration range $X_{pr} sim (0.3-0.38)$ mole propanol molecules form the micelles.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"22 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":"86485849","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/NAP51885.2021.9568557
Yu.M. Shabelnyk, A. Chornous, L. Dekhtyaruk, D. Saltykov, Y. Shkurdoda, P. Pavlov
Using two-point [1], [2] and resistor [3] –[8] models, an analysis of the effect of giant magnetoresistance (GMR) in an asymmetric (the magnetic components of a conductor are made of different ferromagnetic metals or different alloys based on them, or one component is an alloy and the other is a metal) magnetically ordered three-layer film (sandwich) was carried out depending on the change in the thickness of the metal covering magnetic layer dm2 and it was shown that when the approximate equality $d_{m1}cong d_{m2}(d_{m1}$- thickness of the base magnetic layer, $d_{n}-$ thickness of the non-magnetic layer (spacer)) the value of the GMR effect reaches its maximum due to the absence of the shunting effect. Using the sandwich model with an ultrathin interlayer, it is theoretically shown that with the experimentally measured amplitude value of the magnetoresistance ratio (MRR) and knowledge of the asymmetry parameter in spin-polarized electron scattering in the base magnetic layer, it is theoretically possible to calculate the above mentioned asymmetry parameter in the covering magnetic layer.
{"title":"Giant Magnetoresistive Effect in Magnetically Ordered Asymmetric Sandwiches Based on Co and Fe","authors":"Yu.M. Shabelnyk, A. Chornous, L. Dekhtyaruk, D. Saltykov, Y. Shkurdoda, P. Pavlov","doi":"10.1109/NAP51885.2021.9568557","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568557","url":null,"abstract":"Using two-point [1], [2] and resistor [3] –[8] models, an analysis of the effect of giant magnetoresistance (GMR) in an asymmetric (the magnetic components of a conductor are made of different ferromagnetic metals or different alloys based on them, or one component is an alloy and the other is a metal) magnetically ordered three-layer film (sandwich) was carried out depending on the change in the thickness of the metal covering magnetic layer dm2 and it was shown that when the approximate equality $d_{m1}cong d_{m2}(d_{m1}$- thickness of the base magnetic layer, $d_{n}-$ thickness of the non-magnetic layer (spacer)) the value of the GMR effect reaches its maximum due to the absence of the shunting effect. Using the sandwich model with an ultrathin interlayer, it is theoretically shown that with the experimentally measured amplitude value of the magnetoresistance ratio (MRR) and knowledge of the asymmetry parameter in spin-polarized electron scattering in the base magnetic layer, it is theoretically possible to calculate the above mentioned asymmetry parameter in the covering magnetic layer.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"36 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":"88555030","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/NAP51885.2021.9568532
O. Chukova, T. Voitenko, Houri Sadat Rahimi Mosafer, S. Nedilko, A. Papadopoulos, W. Paszkowicz, S. Nedilko, E. Stratakis, M. Etter
The EuVO4 nanoparticles doped with Ca2+ impurities were synthesized by citrate-nitrate sol-gel method and investigated. Diffuse reflection spectra of the EuVO4:Ca samples contain two additional bands around 400 and 470 nm those were not observed for the undoped EuVO4. These bands were ascribed to Ca-induced defects in the vanadate crystal lattice. Origin of these defects is studied taking into account results of high resolution XRD measurements. The additive XRD peaks were found for the Eu0.8Ca0.2VO4, sample. These peaks were identified as traces of the Ca2V2O7 second crystal phase in the synthesized nanoparticles. The maximal concentrations of the Ca2+ heterovalent impurity permits to keep single phase EuVO4:Ca sol-gel nanoparticles were estimated.
{"title":"Study of Structure of Defect Centers in Europium Vanadate Nanoparticles with Heterovalent Dopants","authors":"O. Chukova, T. Voitenko, Houri Sadat Rahimi Mosafer, S. Nedilko, A. Papadopoulos, W. Paszkowicz, S. Nedilko, E. Stratakis, M. Etter","doi":"10.1109/NAP51885.2021.9568532","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568532","url":null,"abstract":"The EuVO<inf>4</inf> nanoparticles doped with Ca<sup>2+</sup> impurities were synthesized by citrate-nitrate sol-gel method and investigated. Diffuse reflection spectra of the EuVO<inf>4</inf>:Ca samples contain two additional bands around 400 and 470 nm those were not observed for the undoped EuVO<inf>4</inf>. These bands were ascribed to Ca-induced defects in the vanadate crystal lattice. Origin of these defects is studied taking into account results of high resolution XRD measurements. The additive XRD peaks were found for the Eu<inf>0.8</inf>Ca<inf>0.2</inf>VO<inf>4</inf>, sample. These peaks were identified as traces of the Ca<inf>2</inf>V<inf>2</inf>O<inf>7</inf> second crystal phase in the synthesized nanoparticles. The maximal concentrations of the Ca<sup>2+</sup> heterovalent impurity permits to keep single phase EuVO<inf>4</inf>:Ca sol-gel nanoparticles were estimated.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"48 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":"79172056","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/NAP51885.2021.9568512
V. Ivashchenko, A. Onoprienko, P. Scrynskyy, Andriy Kozak, E. Olifan, A. Kovalchenko, A. Sinelnitchenko, Alexander Marchuk
The films in Ti-B-C system have been deposited onto Si (100) substrates by dual direct current magnetron sputtering of TiB2 and B4 C targets. During deposition, the sputtering parameters at the TiB2 target were unchanged, whereas sputtering current at the B4 C target was varied in the range of 50-200 mA. The films were characterized in terms of their structure, composition, and mechanical properties. The X-ray diffraction measurements showed that all the films contain only TiB2 crystalline phase of prominent (001) and (002) textures. The film hardness first increased reaching maximum value of about 53.5 GPa for films deposited with 100 mA B4 C sputtering current, and then it decreased with increasing current. The coefficient of friction of films was unchanged with increasing the sputtering current at B4 C target.
{"title":"Structure and Properties of Ti-B-C Films Deposited by DC Magnetron Sputtering of TiB2 and B4 C Targets","authors":"V. Ivashchenko, A. Onoprienko, P. Scrynskyy, Andriy Kozak, E. Olifan, A. Kovalchenko, A. Sinelnitchenko, Alexander Marchuk","doi":"10.1109/NAP51885.2021.9568512","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568512","url":null,"abstract":"The films in Ti-B-C system have been deposited onto Si (100) substrates by dual direct current magnetron sputtering of TiB2 and B4 C targets. During deposition, the sputtering parameters at the TiB2 target were unchanged, whereas sputtering current at the B4 C target was varied in the range of 50-200 mA. The films were characterized in terms of their structure, composition, and mechanical properties. The X-ray diffraction measurements showed that all the films contain only TiB2 crystalline phase of prominent (001) and (002) textures. The film hardness first increased reaching maximum value of about 53.5 GPa for films deposited with 100 mA B4 C sputtering current, and then it decreased with increasing current. The coefficient of friction of films was unchanged with increasing the sputtering current at B4 C target.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"26 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":"87296222","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/NAP51885.2021.9568559
A. Artyukhov, I. Volk, N. Artyukhova, Nataliya Borozenets
The article is devoted to the description of functioning conditions for the granulation module for the porous ammonium nitrate (PAN) production. We present general information on ammonium nitrate structure role in the process of ensuring the quality indicators of an industrial explosive. We substantiate the necessity of using PAN in the industrial explosives production. We introduce a method for obtaining PAN by humidification followed by thermal processing in apparatus with various configurations of fluidized bed and the use of active hydrodynamic modes. A technological scheme for implementing the method is described. We give a brief description of the hardware design of the granulation and final drying stage. The results of microscopic analysis of PAN granules are presented and the nanoporous structure features are described. The technique of technological calculation of the granulation device for the PAN production is proposed.
{"title":"Ammonium Nitrate with Nanoporous Structure Production Unit: Foundations of Creation, Operation Principles, Product Quality Indicators","authors":"A. Artyukhov, I. Volk, N. Artyukhova, Nataliya Borozenets","doi":"10.1109/NAP51885.2021.9568559","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568559","url":null,"abstract":"The article is devoted to the description of functioning conditions for the granulation module for the porous ammonium nitrate (PAN) production. We present general information on ammonium nitrate structure role in the process of ensuring the quality indicators of an industrial explosive. We substantiate the necessity of using PAN in the industrial explosives production. We introduce a method for obtaining PAN by humidification followed by thermal processing in apparatus with various configurations of fluidized bed and the use of active hydrodynamic modes. A technological scheme for implementing the method is described. We give a brief description of the hardware design of the granulation and final drying stage. The results of microscopic analysis of PAN granules are presented and the nanoporous structure features are described. The technique of technological calculation of the granulation device for the PAN production is proposed.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"83 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":"85960903","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/NAP51885.2021.9568580
A. Gondlyakh, A. Sokolskiy, Tetiana Shylovych, Yaroslav I. Shylovych, A. Chemeris, S. Antonyuk
This article is devoted to the issue of numerical modeling of the processes of nonlinear deformation and fracture of nanomodified ceramics. Deformation of an elementary volume with nanotube is carried out on the basis of a three-layer scheme “nanotube - contact layer - ceramic”. Integration of the resolving system of equilibrium equations “nanotube-ceramic” is carried out on the basis of the finite element method. On the basis of the energy approach, a technique has been developed for the efficient determination of the additional energy required to pull out a nanotube from a ceramic solid. The study of the dependence of the ultimate strength of nanomodified ceramics depending on the percentage of nanotubes in the ceramic is carried out. The numerical simulation results are in good agreement with the experimental results. The difference between numerically obtained ultimate strengths and experimental ultimate strengths does not exceed 5%. The developed methods can be used in the practice of designing structures made of nanomodified ceramics.
{"title":"Numerical Determination of the Strength of Nanomodified Ceramics","authors":"A. Gondlyakh, A. Sokolskiy, Tetiana Shylovych, Yaroslav I. Shylovych, A. Chemeris, S. Antonyuk","doi":"10.1109/NAP51885.2021.9568580","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568580","url":null,"abstract":"This article is devoted to the issue of numerical modeling of the processes of nonlinear deformation and fracture of nanomodified ceramics. Deformation of an elementary volume with nanotube is carried out on the basis of a three-layer scheme “nanotube - contact layer - ceramic”. Integration of the resolving system of equilibrium equations “nanotube-ceramic” is carried out on the basis of the finite element method. On the basis of the energy approach, a technique has been developed for the efficient determination of the additional energy required to pull out a nanotube from a ceramic solid. The study of the dependence of the ultimate strength of nanomodified ceramics depending on the percentage of nanotubes in the ceramic is carried out. The numerical simulation results are in good agreement with the experimental results. The difference between numerically obtained ultimate strengths and experimental ultimate strengths does not exceed 5%. The developed methods can be used in the practice of designing structures made of nanomodified ceramics.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"60 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90752936","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/NAP51885.2021.9568596
Y. Oleksii, E. Get’man, S. Radio, L. I. Ardanova, E. Zubov
Within the framework of the crystal–energy theory of isomorphous substitutions, the mixing energies and critical temperatures of decomposition (stability) of solid solutions with the tizonite structure in the La1-x Lnx F3, Ln = Ce–Ho systems are calculated. A diagram of the thermodynamic stability of solid solutions is presented, which makes it possible to predict the limits of substitutions depending on the temperature or the temperature of decomposition according to the given limits of substitutions. The regions of thermodynamic stability, instability and metastability of solid solutions are determined. The calculation results in a number of systems that do not contradict the experimental data described earlier in the literature. They can be useful in choosing the ratio of components in “mixed” matrices, the amount of activator in luminescent, laser and other practically important materials, as well as for the immobilization of toxic and radioactive waste.
{"title":"Isomorphous substitutions and Stability of Solid Solutions in La1-xLnxF3, Ln = Ce-Ho Systems","authors":"Y. Oleksii, E. Get’man, S. Radio, L. I. Ardanova, E. Zubov","doi":"10.1109/NAP51885.2021.9568596","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568596","url":null,"abstract":"Within the framework of the crystal–energy theory of isomorphous substitutions, the mixing energies and critical temperatures of decomposition (stability) of solid solutions with the tizonite structure in the La1-x Lnx F3, Ln = Ce–Ho systems are calculated. A diagram of the thermodynamic stability of solid solutions is presented, which makes it possible to predict the limits of substitutions depending on the temperature or the temperature of decomposition according to the given limits of substitutions. The regions of thermodynamic stability, instability and metastability of solid solutions are determined. The calculation results in a number of systems that do not contradict the experimental data described earlier in the literature. They can be useful in choosing the ratio of components in “mixed” matrices, the amount of activator in luminescent, laser and other practically important materials, as well as for the immobilization of toxic and radioactive waste.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"26 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":"84044194","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/NAP51885.2021.9568505
H. Krüger, H. Cavers, O. Gronenberg, U. Schürmann, Y. Mishra, Jannick Jacobsen, J. Carstensen, N. Stock, L. Kienle, F. Schütt, R. Adelung, S. Hansen
In this study, double hierarchical and highly porous 3D carbon nanotube/sulfur (CNTT/S) composites were synthesized. By coating a ceramic template material with a simple and versatile infiltration process of an aqueous carbon nanotube (CNT) dispersion a self-organized CNT layer is formed. After removing the template material, a freestanding double hierarchical network is created that show excellent electrical conductivity of 6.02 S m-1 and a high specific BET surface area of 630 m2 with the presence of micro-, mesopores (up to 4 nm) and macropores (>>50 nm) simultaneously. A combined analysis of gas sorption measurements and elemental mapping using EFTEM after sulfur vapor deposition revealed that only the micro- and mesopores were accessible and that the sulfur is encapsulated within the double hierarchy. Hence, the electric percolation remains high without losing the necessary outer conductivity. Thereafter, these composites were employed in a proof-of-concept study as a sulfur cathode, demonstrating the importance of predesigning an electrode structure, shown in electrochemical performance data. With the aid of this hierarchical 3D composite structure, it is possible to achieve a stability over 100 cycles with $approx$ 5.8 mAh cm-1 as a sulfur cathode in lithium half-cell tests.
在本研究中，合成了双层、高多孔的三维碳纳米管/硫(CNTT/S)复合材料。通过在陶瓷模板材料上涂覆水碳纳米管(CNT)分散体的简单而通用的渗透工艺，形成了自组织的碳纳米管层。去除模板材料后，形成了一个独立的双层分层网络，具有6.02 S m-1的优异导电性和630 m2的高比BET表面积，同时存在微孔、中孔(高达4 nm)和大孔(>>50 nm)。硫气相沉积后的气体吸附测量和EFTEM元素测绘的综合分析表明，只有微孔和中孔可达，硫被包裹在双层结构中。因此，电渗透保持高而不失去必要的外部导电性。之后，这些复合材料被用于硫阴极的概念验证研究，证明了预先设计电极结构的重要性，电化学性能数据显示。在这种分层3D复合结构的帮助下，在锂半电池测试中，作为硫阴极，它可以在大约5.8 mAh cm-1的条件下实现超过100次循环的稳定性。
{"title":"Double Hierarchical 3D Carbon Nanotube Network with Tailored Structure as a Lithium Sulfur Cathode","authors":"H. Krüger, H. Cavers, O. Gronenberg, U. Schürmann, Y. Mishra, Jannick Jacobsen, J. Carstensen, N. Stock, L. Kienle, F. Schütt, R. Adelung, S. Hansen","doi":"10.1109/NAP51885.2021.9568505","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568505","url":null,"abstract":"In this study, double hierarchical and highly porous 3D carbon nanotube/sulfur (CNTT/S) composites were synthesized. By coating a ceramic template material with a simple and versatile infiltration process of an aqueous carbon nanotube (CNT) dispersion a self-organized CNT layer is formed. After removing the template material, a freestanding double hierarchical network is created that show excellent electrical conductivity of 6.02 S m-1 and a high specific BET surface area of 630 m2 with the presence of micro-, mesopores (up to 4 nm) and macropores (>>50 nm) simultaneously. A combined analysis of gas sorption measurements and elemental mapping using EFTEM after sulfur vapor deposition revealed that only the micro- and mesopores were accessible and that the sulfur is encapsulated within the double hierarchy. Hence, the electric percolation remains high without losing the necessary outer conductivity. Thereafter, these composites were employed in a proof-of-concept study as a sulfur cathode, demonstrating the importance of predesigning an electrode structure, shown in electrochemical performance data. With the aid of this hierarchical 3D composite structure, it is possible to achieve a stability over 100 cycles with $approx$ 5.8 mAh cm-1 as a sulfur cathode in lithium half-cell tests.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"36 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82505143","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/NAP51885.2021.9568547
V. Prokopyuk, A. Onishchenko, S. Yefimova, T. Chumachenko, N. Kavok, P. Maksimchuk, V. Klochkov, A. Tkachenko
Aim. To assess the viability and functional activity of cultured rat skin fibroblasts directly exposed to various concentrations of GdYVO4:Eu3+ nanoparticles.Materials and methods. Cultured rat dermal fibroblasts (n=8) were incubated with GdYVO4:Eu3+ nanoparticles at different concentrations (0 - 320 μg/ml) for 24 h. The cytotoxicity was evaluated in a complex manner. In particular, the MTT assay was used to assess cellular metabolic activity. The viability of cells was quantitatively estimated using the neutral red uptake assay. To evaluate the effects of nanoparticles on the mobility of dermal fibroblasts, the scratch assay was used. Results. Our experimental data demonstrated that the GdYVO4:Eu3+ nanoparticles had no effect on fibroblast viability at any concentration used, evidenced by the results of neutral red uptake assay. However, incubation of cultured fibroblasts starting from the concentration of 80 μg/ml and above increased the metabolic activity of cells, based on the outcome of MTT assay, and promoted the loss of adhesion. Similarly, scratch assay revealed the reduction of fibroblast migration capacity in cells exposed to 80 μg/ml and higher concentrations of nanoparticles. Conclusions. Low concentrations of GdYVO4:Eu3+ (below 40 μg/ml) show no cytotoxic properties towards fibroblasts, while their higher concentrations affect the metabolic activity and functional properties of cells.
{"title":"Cytotoxicity Tests on Cultured Rat Skin Fibroblasts Revealed no Toxicity for Low Concentrations of GdYVO4:Eu3+ Nanoparticles","authors":"V. Prokopyuk, A. Onishchenko, S. Yefimova, T. Chumachenko, N. Kavok, P. Maksimchuk, V. Klochkov, A. Tkachenko","doi":"10.1109/NAP51885.2021.9568547","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568547","url":null,"abstract":"Aim. To assess the viability and functional activity of cultured rat skin fibroblasts directly exposed to various concentrations of GdYVO4:Eu3+ nanoparticles.Materials and methods. Cultured rat dermal fibroblasts (n=8) were incubated with GdYVO4:Eu3+ nanoparticles at different concentrations (0 - 320 μg/ml) for 24 h. The cytotoxicity was evaluated in a complex manner. In particular, the MTT assay was used to assess cellular metabolic activity. The viability of cells was quantitatively estimated using the neutral red uptake assay. To evaluate the effects of nanoparticles on the mobility of dermal fibroblasts, the scratch assay was used. Results. Our experimental data demonstrated that the GdYVO4:Eu3+ nanoparticles had no effect on fibroblast viability at any concentration used, evidenced by the results of neutral red uptake assay. However, incubation of cultured fibroblasts starting from the concentration of 80 μg/ml and above increased the metabolic activity of cells, based on the outcome of MTT assay, and promoted the loss of adhesion. Similarly, scratch assay revealed the reduction of fibroblast migration capacity in cells exposed to 80 μg/ml and higher concentrations of nanoparticles. Conclusions. Low concentrations of GdYVO4:Eu3+ (below 40 μg/ml) show no cytotoxic properties towards fibroblasts, while their higher concentrations affect the metabolic activity and functional properties of cells.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"12 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":"82790597","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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