Pub Date : 2021-09-05DOI: 10.1109/NAP51885.2021.9568394
M. Savyak, P. Sylenko, Y. Solonin
High enthalpy of refractory metals borides and carbides points that these compounds can be obtained at low temperature. This can be performed with help of a planetary mill where synthesis processes take place at low temperatures. The carbide and boride formation process at a low temperature yields compounds in nanocrystalline state with the specific surface area up to 7 m2/g. The formation of a particular phase through milling of refractory metals with boron or carbon in a planetary mill depends on the physical-chemical properties of starting powders, enthalpy of the final product formation, and on the intensity of milling process. Depending on these conditions, processes of mechanical alloying in the system Me-boron and Me-carbon run by the following mechanisms: mechanically-induced reaction of self-propagating synthesis (MSS), diffusion-controlled process of interstitial solid solutions decomposition and destruction (amorphization) of the initial metals with subsequent formation of carbide and boride nucleation’s. The compounds obtained during mechanochemical synthesis, independently of the mechanism formation, have a nanostructure.
难熔金属硼化物和碳化物的高焓表明这些化合物可以在低温下得到。这可以在行星磨的帮助下进行，其中合成过程在低温下进行。在低温下碳化物和硼化物的形成过程产生纳米晶状态的化合物，其比表面积高达7 m2/g。在行星磨机中，用硼或碳研磨难熔金属所形成的特定相取决于起始粉末的物理化学性质、最终产物形成的焓和研磨过程的强度。根据这些条件，me -硼- me -碳体系的机械合金化过程由以下机制运行:机械诱导的自传播合成反应(MSS)，扩散控制的间隙固溶体分解和破坏(非晶化)的初始金属，随后形成碳化物和硼化物成核。在机械化学合成过程中获得的化合物，独立于机制形成，具有纳米结构。
{"title":"Mechanical Alloying of Refractory Metals with Boron and Carbon as a Method of Nanocrystalline Compounds Powders Obtaining","authors":"M. Savyak, P. Sylenko, Y. Solonin","doi":"10.1109/NAP51885.2021.9568394","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568394","url":null,"abstract":"High enthalpy of refractory metals borides and carbides points that these compounds can be obtained at low temperature. This can be performed with help of a planetary mill where synthesis processes take place at low temperatures. The carbide and boride formation process at a low temperature yields compounds in nanocrystalline state with the specific surface area up to 7 m2/g. The formation of a particular phase through milling of refractory metals with boron or carbon in a planetary mill depends on the physical-chemical properties of starting powders, enthalpy of the final product formation, and on the intensity of milling process. Depending on these conditions, processes of mechanical alloying in the system Me-boron and Me-carbon run by the following mechanisms: mechanically-induced reaction of self-propagating synthesis (MSS), diffusion-controlled process of interstitial solid solutions decomposition and destruction (amorphization) of the initial metals with subsequent formation of carbide and boride nucleation’s. The compounds obtained during mechanochemical synthesis, independently of the mechanism formation, have a nanostructure.","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":"85825502","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/NAP51885.2021.9568527
O. Kalinkevich, A. Sklyar, A. Gudakov, Yevgen Zinchenko, A. Kalinkevich, S. Danilchenko, D. Sofronov, V. Chivanov, V. Starikov, T. Markina, Marina Pakhucha
In our work, chitin was isolated from the adult grain moth biomass, its properties were studied, and a nanoform was obtained. The moth chitin differs from the classic crab chitin produced on an industrial scale by a lower degree of crystallinity, hygroscopicity, and a higher content of amino groups, which makes it easier to obtain nanoforms. Chitin nanoflbrils can be used for various medical applications.
{"title":"Insect Chitin Nanofibers for Medical Application: Obtaining and Characterization","authors":"O. Kalinkevich, A. Sklyar, A. Gudakov, Yevgen Zinchenko, A. Kalinkevich, S. Danilchenko, D. Sofronov, V. Chivanov, V. Starikov, T. Markina, Marina Pakhucha","doi":"10.1109/NAP51885.2021.9568527","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568527","url":null,"abstract":"In our work, chitin was isolated from the adult grain moth biomass, its properties were studied, and a nanoform was obtained. The moth chitin differs from the classic crab chitin produced on an industrial scale by a lower degree of crystallinity, hygroscopicity, and a higher content of amino groups, which makes it easier to obtain nanoforms. Chitin nanoflbrils can be used for various medical applications.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"15 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":"88704711","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/NAP51885.2021.9568540
N. Ababii, M. Bodduluri, H. Krüger, S. Hansen, V. Postica, O. Lupan, R. Adelung
The gas sensing properties of heterojunctions based on binary and ternary metal oxides (CuAl2O4/Al2O3/CuO/Cu2O, ZnAl2O4/ZnO and Zn2SnO4) were investigated in detail and demonstrated excellent sensitivity and selectivity to a series of gases and volatile organic compounds (VOCs), such as H2, CO and ethanol. The dynamic measurements showed excellent response stability at low and high relative humidity, which is very important for applications like diseases detection by breath analysis.
{"title":"High-Performance Gas Sensors Using Heterostructures based on Binary and Ternary Metal Oxides","authors":"N. Ababii, M. Bodduluri, H. Krüger, S. Hansen, V. Postica, O. Lupan, R. Adelung","doi":"10.1109/NAP51885.2021.9568540","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568540","url":null,"abstract":"The gas sensing properties of heterojunctions based on binary and ternary metal oxides (CuAl<inf>2</inf>O<inf>4</inf>/Al<inf>2</inf>O<inf>3</inf>/CuO/Cu<inf>2</inf>O, ZnAl<inf>2</inf>O<inf>4</inf>/ZnO and Zn<inf>2</inf>SnO<inf>4</inf>) were investigated in detail and demonstrated excellent sensitivity and selectivity to a series of gases and volatile organic compounds (VOCs), such as H<inf>2</inf>, CO and ethanol. The dynamic measurements showed excellent response stability at low and high relative humidity, which is very important for applications like diseases detection by breath analysis.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"100 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":"87279904","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/NAP51885.2021.9568395
I. Ovsiienko, T. L. Tsaregradskaya, D. Shpylka, L. Matzui, G. V. Saenko, U. Ritter, T. Len, Y. Prylutskyy
Paper presents the results of experimental investigations of magnetoresistance of filled with iron multi-walled carbon nanotubes. Multi-walled carbon nanotubes have been prepared by pyrolysis of benzene in a tubular quartz furnace at a temperature of $950 ^{circ}text{C}$ with use ferrocene as a source of iron. The obtained by this method carbon nanotubes contain in the inner cavity the particles of the magnetic phase, namely iron, iron carbide and iron oxides in various concentrations. The electrical resistance of bulk specimens of modified carbon nanotubes have been carried out in the temperature interval from 4.2 K to 293 K and in magnetic field up to 2 T. It is shown that magnetoresistance of modified carbon nanotubes is determined by a combination of two effects: the giant magnetoresistance effect and anisotropic magnetoresistance effect, moreover, the relative contribution of each effect depends on the concentration of the magnetic phase.
本文介绍了铁填充多壁碳纳米管的磁阻实验研究结果。以二茂铁为铁源，在管状石英炉中以苯为原料，在950 ^{circ}text{C}$的温度下热解制备了多壁碳纳米管。该方法制备的碳纳米管内腔中含有不同浓度的铁、碳化铁和氧化铁等磁性相颗粒。在4.2 K ~ 293 K的温度范围和2 t的磁场范围内对改性碳纳米管的体样电阻进行了测试。结果表明，改性碳纳米管的磁电阻是由巨磁电阻效应和各向异性磁电阻效应两种效应共同决定的，并且每种效应的相对贡献取决于磁相的浓度。
{"title":"Magnetoresistance of Carbon Nanotubes Filled by Iron","authors":"I. Ovsiienko, T. L. Tsaregradskaya, D. Shpylka, L. Matzui, G. V. Saenko, U. Ritter, T. Len, Y. Prylutskyy","doi":"10.1109/NAP51885.2021.9568395","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568395","url":null,"abstract":"Paper presents the results of experimental investigations of magnetoresistance of filled with iron multi-walled carbon nanotubes. Multi-walled carbon nanotubes have been prepared by pyrolysis of benzene in a tubular quartz furnace at a temperature of $950 ^{circ}text{C}$ with use ferrocene as a source of iron. The obtained by this method carbon nanotubes contain in the inner cavity the particles of the magnetic phase, namely iron, iron carbide and iron oxides in various concentrations. The electrical resistance of bulk specimens of modified carbon nanotubes have been carried out in the temperature interval from 4.2 K to 293 K and in magnetic field up to 2 T. It is shown that magnetoresistance of modified carbon nanotubes is determined by a combination of two effects: the giant magnetoresistance effect and anisotropic magnetoresistance effect, moreover, the relative contribution of each effect depends on the concentration of the magnetic phase.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"75 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":"88080228","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/NAP51885.2021.9656569
Oluwafunmilola Ola, Yu Chen, Yanqiu Zhu, D. Grant
Hexagonal tungsten oxide (WO3) holds great promise as an electrode material for pseudocapacitors due to its earth abundance, low cost, multiple oxidation states, high packing density (>7 g cm-3) and electrochemical reversibility. Here, we present the development of flexible electrodes consisting of WO3 nanoflowers supported on graphitic carbon nitride (g-C3N4) foams. The WO3/g-C3N4 electrodes were prepared via a facile solvothermal approach followed by carbonization. The resulting WO3/g-C3N4 electrodes have demonstrated excellent performance with specific capacitance of 1130 F g-1 at 0.5 A g-1 and good cyclic stability of 95% after 4,000 cycles in 0.5M H2SO4 electrolyte.
六方氧化钨(WO3)具有稀土丰度高、成本低、多种氧化态、高密度(7 g cm-3)和电化学可逆性等优点，作为赝电容器电极材料具有广阔的应用前景。在这里，我们提出了由石墨氮化碳(g-C3N4)泡沫支撑的WO3纳米花组成的柔性电极的发展。采用简单的溶剂热法和炭化法制备了WO3/g-C3N4电极。所制备的WO3/g-C3N4电极在0.5 A g-1时的比电容为1130 F -1，在0.5 m H2SO4电解液中循环4000次后的循环稳定性为95%。
{"title":"Pseudocapacitive Performance of WO3/g-C3N4 Nanocomposites","authors":"Oluwafunmilola Ola, Yu Chen, Yanqiu Zhu, D. Grant","doi":"10.1109/NAP51885.2021.9656569","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9656569","url":null,"abstract":"Hexagonal tungsten oxide (WO<inf>3</inf>) holds great promise as an electrode material for pseudocapacitors due to its earth abundance, low cost, multiple oxidation states, high packing density (>7 g cm<sup>-3</sup>) and electrochemical reversibility. Here, we present the development of flexible electrodes consisting of WO<inf>3</inf> nanoflowers supported on graphitic carbon nitride (g-C<inf>3</inf>N<inf>4</inf>) foams. The WO<inf>3</inf>/g-C<inf>3</inf>N<inf>4</inf> electrodes were prepared via a facile solvothermal approach followed by carbonization. The resulting WO<inf>3</inf>/g-C<inf>3</inf>N<inf>4</inf> electrodes have demonstrated excellent performance with specific capacitance of 1130 F g<sup>-1</sup> at 0.5 A g<sup>-1</sup> and good cyclic stability of 95% after 4,000 cycles in 0.5M H<inf>2</inf>SO<inf>4</inf> electrolyte.","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":"83702768","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/NAP51885.2021.9568618
T. Rodionova
The effect of annealing on the grain-boundary structure and the relative grain-boundary energy of phosphorus-doped polysilicon films, obtained by low-pressure chemical vapor deposition, was studied by transmission electron microscopy and atomic force microscopy. The obtained distributions of the types of grain boundaries for different annealing temperatures showed that a significant part of the grain boundaries in polysilicon films are special grain boundaries, in particular, twin boundaries of different orders of twinning. It is assumed that the difference in the distributions of special boundaries for different annealing temperatures is due to the difference in the mechanisms of grain growth in different temperature ranges. The relative amount of a particular type of special grain boundaries in the films is determined by the annealing temperature and is the result of processes that take place when the temperature increases, in particular, the processes of growth of first-order annealing twins and splitting of high-order twin boundaries. Estimates of the relative grain-boundary energy by the method of grain-boundary grooves based on the data of atomic force microscopy, have shown that the relative grain-boundary energy decreases with an increasing of annealing temperature. Such a decrease is due to an increase in the number of special boundaries, faceting of grain boundaries.
{"title":"Evolution of Special Grain Boundaries and Relative Grain-Boundary Energy in Phosphorus-Doped Polysilicon Films under Annealing","authors":"T. Rodionova","doi":"10.1109/NAP51885.2021.9568618","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568618","url":null,"abstract":"The effect of annealing on the grain-boundary structure and the relative grain-boundary energy of phosphorus-doped polysilicon films, obtained by low-pressure chemical vapor deposition, was studied by transmission electron microscopy and atomic force microscopy. The obtained distributions of the types of grain boundaries for different annealing temperatures showed that a significant part of the grain boundaries in polysilicon films are special grain boundaries, in particular, twin boundaries of different orders of twinning. It is assumed that the difference in the distributions of special boundaries for different annealing temperatures is due to the difference in the mechanisms of grain growth in different temperature ranges. The relative amount of a particular type of special grain boundaries in the films is determined by the annealing temperature and is the result of processes that take place when the temperature increases, in particular, the processes of growth of first-order annealing twins and splitting of high-order twin boundaries. Estimates of the relative grain-boundary energy by the method of grain-boundary grooves based on the data of atomic force microscopy, have shown that the relative grain-boundary energy decreases with an increasing of annealing temperature. Such a decrease is due to an increase in the number of special boundaries, faceting of grain boundaries.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"42 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":"82036939","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/NAP51885.2021.9568551
K. Khanchych, V. Zhelezny, O. Khliyeva, Ivan Diachenko, Y. Semenyuk, Yana Hlek
The results of modeling the viscosity of fullerene-containing nanofluids (NFs) in a wide temperature range are presented. Two different models for predicting the viscosity of NFs are proposed. The first one is based on the thermodynamic similarity of the studied NFs with their base fluids. It was established that solutions of fullerene ${mathrm C}_{60}$ in o-xylene as well as solutions of fullerene ${mathrm C}_{60}$ in tetralin (1,2,3,4 - tetrahydronaphthalene) are thermodynamically similar with o-xylene and tetralin, respectively. To calculate the viscosity of fullerene-containing NFs, the equations based on the activation theory of viscous flow were used. An analysis of the temperature dependence of the activation energy of the base fluids and corresponding NFs was performed. It was found that the temperature dependences of the activation energy of the base fluids and corresponding NFs are practically equidistant lines. That makes possible to predict the viscosity of the NFs using the obtained temperature dependences of the activation energy of the base fluids and limited information on the NF’s viscosity (one experimental value for a certain concentration). The second model for predicting the viscosity of the NFs is based on the information on a free volume that can be obtained from data on the density of the NFs. In this model, it is proposed to use as the free volume of the studied solutions the inverse quantities to their critical amplitudes calculated by the author’s model of the extended scaling.
{"title":"On Modelling the Viscosity of Fullerene-Containing Nanofluids","authors":"K. Khanchych, V. Zhelezny, O. Khliyeva, Ivan Diachenko, Y. Semenyuk, Yana Hlek","doi":"10.1109/NAP51885.2021.9568551","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568551","url":null,"abstract":"The results of modeling the viscosity of fullerene-containing nanofluids (NFs) in a wide temperature range are presented. Two different models for predicting the viscosity of NFs are proposed. The first one is based on the thermodynamic similarity of the studied NFs with their base fluids. It was established that solutions of fullerene ${mathrm C}_{60}$ in o-xylene as well as solutions of fullerene ${mathrm C}_{60}$ in tetralin (1,2,3,4 - tetrahydronaphthalene) are thermodynamically similar with o-xylene and tetralin, respectively. To calculate the viscosity of fullerene-containing NFs, the equations based on the activation theory of viscous flow were used. An analysis of the temperature dependence of the activation energy of the base fluids and corresponding NFs was performed. It was found that the temperature dependences of the activation energy of the base fluids and corresponding NFs are practically equidistant lines. That makes possible to predict the viscosity of the NFs using the obtained temperature dependences of the activation energy of the base fluids and limited information on the NF’s viscosity (one experimental value for a certain concentration). The second model for predicting the viscosity of the NFs is based on the information on a free volume that can be obtained from data on the density of the NFs. In this model, it is proposed to use as the free volume of the studied solutions the inverse quantities to their critical amplitudes calculated by the author’s model of the extended scaling.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"68 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":"80049192","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/NAP51885.2021.9568625
Rymar Tetiana, Kazmiruk Myroslava, Shyika Ivan
Nanofluids, it is the new of generation of the fluids, as it ensures the reliability, efficiency, economy of the modern system of heat supply. Nanofluid-heat carriers are environmentally friendly. Using such heat carriers it is possible to save energy resources, that is, to consume less electricity and fossil energy sources. Nanofluid with volume concentrations of Al2O3 nanoparticles of 0.3S%, 0. S1 % and 1.30% was used as a heat carrier of the geothermal probe of the heat supply system. The convective heat exchange and the friction coefficient of such nanofluid in a round polyethylene pipe $emptyset 40times 2.4$ mm of the geothermal probe with a constant wall temperature under conditions of turbulent flow have been studied. In the work there is comparing the transport and thermal characteristics of nanofluids based on Al2O3 and water. The coefficient of the efficiency using of the studied nanofluids with Al2O3 nanoparticles was greater than one, and had a maximum value of 1.197. This is due to the fact that nanofluids have better thermal characteristics compared to water, which leads to improving the heat transfer in general. However, it should be noted that nanofluids have higher values of the viscosity coefficient, which degrades the hydrodynamic performance of the system.
{"title":"The Efficiency of Nanofluid Use in the Heat Supply System of a House with a Geothermal Heat Pump","authors":"Rymar Tetiana, Kazmiruk Myroslava, Shyika Ivan","doi":"10.1109/NAP51885.2021.9568625","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568625","url":null,"abstract":"Nanofluids, it is the new of generation of the fluids, as it ensures the reliability, efficiency, economy of the modern system of heat supply. Nanofluid-heat carriers are environmentally friendly. Using such heat carriers it is possible to save energy resources, that is, to consume less electricity and fossil energy sources. Nanofluid with volume concentrations of Al2O3 nanoparticles of 0.3S%, 0. S1 % and 1.30% was used as a heat carrier of the geothermal probe of the heat supply system. The convective heat exchange and the friction coefficient of such nanofluid in a round polyethylene pipe $emptyset 40times 2.4$ mm of the geothermal probe with a constant wall temperature under conditions of turbulent flow have been studied. In the work there is comparing the transport and thermal characteristics of nanofluids based on Al2O3 and water. The coefficient of the efficiency using of the studied nanofluids with Al2O3 nanoparticles was greater than one, and had a maximum value of 1.197. This is due to the fact that nanofluids have better thermal characteristics compared to water, which leads to improving the heat transfer in general. However, it should be noted that nanofluids have higher values of the viscosity coefficient, which degrades the hydrodynamic performance of the system.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"2 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":"79785167","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/NAP51885.2021.9568601
V. Chornii, V. Boyko, S. Nedilko, K. Terebilenko, M. Slobodyanik
The procedure for synthesis of luminescent glass-ceramics consisting of 37.09K2 O-31.79P2 O5-25.43MoO3-5.69Bi2 O3 vitreous phase and KBi0.993 Pr0.007(MoO4)2 micro/nanocrystals was described. The results of powder X-ray diffraction, scanning electron microscopy, FTIR and luminescence spectroscopy studies were discussed. It was found that the glass-ceramics samples consist mainly of amorphous phase. The FTIR spectra of the samples indicate a presence of MoO42- and PO43- tetrahedra, as well as MoO66- octahedra in the vitreous framework. The uniform distribution of microsized crystals of potassium bismuth molybdate were found at surfaces of the samples. The KBi0.993 Pr0.007(MoO4)2 grains act as crystallization centres during glass-ceramics preparation. The studied samples revealed the luminescence bands of f-f transitions in Pr3+ ions. The broadening of Pr3+ emission bands in glass-ceramic samples was ascribed to migration of some rare-earth ions from crystalline component into glass host as well to formation of BiPO4 microcrystals.
{"title":"Synthesis, Morphology and Luminescence Properties of Pr3+-containing Phosphate-Molybdate Glass-Ceramics","authors":"V. Chornii, V. Boyko, S. Nedilko, K. Terebilenko, M. Slobodyanik","doi":"10.1109/NAP51885.2021.9568601","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568601","url":null,"abstract":"The procedure for synthesis of luminescent glass-ceramics consisting of 37.09K<inf>2</inf> O-31.79P<inf>2</inf> O<inf>5</inf>-25.43MoO<inf>3</inf>-5.69Bi<inf>2</inf> O<inf>3</inf> vitreous phase and KBi<inf>0.993</inf> Pr<inf>0.007</inf>(MoO<inf>4</inf>)<inf>2</inf> micro/nanocrystals was described. The results of powder X-ray diffraction, scanning electron microscopy, FTIR and luminescence spectroscopy studies were discussed. It was found that the glass-ceramics samples consist mainly of amorphous phase. The FTIR spectra of the samples indicate a presence of MoO<inf>4</inf><sup>2-</sup> and PO<inf>4</inf><sup>3-</sup> tetrahedra, as well as MoO<inf>6</inf><sup>6-</sup> octahedra in the vitreous framework. The uniform distribution of microsized crystals of potassium bismuth molybdate were found at surfaces of the samples. The KBi<inf>0.993</inf> Pr<inf>0.007</inf>(MoO<inf>4</inf>)<inf>2</inf> grains act as crystallization centres during glass-ceramics preparation. The studied samples revealed the luminescence bands of f-f transitions in Pr<sup>3+</sup> ions. The broadening of Pr<sup>3+</sup> emission bands in glass-ceramic samples was ascribed to migration of some rare-earth ions from crystalline component into glass host as well to formation of BiPO<inf>4</inf> microcrystals.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"61 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":"86364205","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/NAP51885.2021.9568563
V. Tarelnyk, O. Gaponova, V. Martsynkovskyy, I. Konoplianchenko, V. Melnyk, V. Vlasovets, M. Mikulina, Sergey Bondarev, O. Vasilenko, S. Hudkov, Anatolii Kutakh, G. Golovchenko
There is proposed a new process for nitriding steel parts by the method of electrospark alloying (ESA), which includes applying a pasty nitrogen component onto the surface of the part and, without waiting for it to dry, performing the ESA process with an electrode-tool made of a material identical to the material of the workpiece being processed. In this case, the increase in the discharge energy of 0.13 to 3.4 J results in increasing, respectively: the thickness of the “white” layer of 10 to 50 microns; the microhardness of the surface layer of 6228 to 9160 MPa; the surface roughness (Ra) of 0.9 to 6.2 microns and the uniformity of the coating from 50 to 80%. The wear resistance of the surfaces for the specimens made of nitrided steel 20 and steel 40, in comparison with non-nitrided ones, increases, respectively, by 219 and 308%.
{"title":"New Process for Nitriding Steel Parts","authors":"V. Tarelnyk, O. Gaponova, V. Martsynkovskyy, I. Konoplianchenko, V. Melnyk, V. Vlasovets, M. Mikulina, Sergey Bondarev, O. Vasilenko, S. Hudkov, Anatolii Kutakh, G. Golovchenko","doi":"10.1109/NAP51885.2021.9568563","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568563","url":null,"abstract":"There is proposed a new process for nitriding steel parts by the method of electrospark alloying (ESA), which includes applying a pasty nitrogen component onto the surface of the part and, without waiting for it to dry, performing the ESA process with an electrode-tool made of a material identical to the material of the workpiece being processed. In this case, the increase in the discharge energy of 0.13 to 3.4 J results in increasing, respectively: the thickness of the “white” layer of 10 to 50 microns; the microhardness of the surface layer of 6228 to 9160 MPa; the surface roughness (Ra) of 0.9 to 6.2 microns and the uniformity of the coating from 50 to 80%. The wear resistance of the surfaces for the specimens made of nitrided steel 20 and steel 40, in comparison with non-nitrided ones, increases, respectively, by 219 and 308%.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"9 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":"87445312","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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