Pub Date : 2021-09-05DOI: 10.1109/NAP51885.2021.9568401
Yu.M. Shabelnyk, L. Dekhtyaruk, D. Saltykov, I. Shpetnyi, A. Chornous, Y. Shkurdoda, A. P. Kharchenko, V. Virchenko
Based on the generalized Dieny formula [1], [2], a theoretical analysis of the dependence of the magnetoresistance ratio $delta$, which quantities the effect of giant magnetoresistance (GMR) in a magnetically ordered three-layer film with a thickness $D=d_{m1}+d_{n}+d_{m2}, (d_{m1}$ and dm2 - thickness of the basic and covering magnetic layers of the metal, respectively, dn thickness of the non-magnetic layer), on the thickness of the covering magnetic layer dm2 was performed. It was shown that in the case of performing inequalities $d_{m2}lt lt (d_{n}+d_{m1}), (d_{m2}gt gt (d_{n}+d_{m1}))$ the value of $delta$ is negligible due to shunting the resistance of the covering layer with the resistances of the basic layer and the non-magnetic layer (shunting the resistance of the basic layer and the non-magnetic layer with the resistance of the covering magnetic layer). If the equality $d_{m2}=(d_{n}+d_{m1})$ is met, the value of $delta$ becomes the maximum (amplitude) value due to the absence of a shunting effect.
{"title":"Dimensional Effect in Magnetoresistance in the Three-Layer Magnetic Films","authors":"Yu.M. Shabelnyk, L. Dekhtyaruk, D. Saltykov, I. Shpetnyi, A. Chornous, Y. Shkurdoda, A. P. Kharchenko, V. Virchenko","doi":"10.1109/NAP51885.2021.9568401","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568401","url":null,"abstract":"Based on the generalized Dieny formula [1], [2], a theoretical analysis of the dependence of the magnetoresistance ratio $delta$, which quantities the effect of giant magnetoresistance (GMR) in a magnetically ordered three-layer film with a thickness $D=d_{m1}+d_{n}+d_{m2}, (d_{m1}$ and dm2 - thickness of the basic and covering magnetic layers of the metal, respectively, dn thickness of the non-magnetic layer), on the thickness of the covering magnetic layer dm2 was performed. It was shown that in the case of performing inequalities $d_{m2}lt lt (d_{n}+d_{m1}), (d_{m2}gt gt (d_{n}+d_{m1}))$ the value of $delta$ is negligible due to shunting the resistance of the covering layer with the resistances of the basic layer and the non-magnetic layer (shunting the resistance of the basic layer and the non-magnetic layer with the resistance of the covering magnetic layer). If the equality $d_{m2}=(d_{n}+d_{m1})$ is met, the value of $delta$ becomes the maximum (amplitude) value due to the absence of a shunting effect.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"170 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":"74325048","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/NAP51885.2021.9568584
Yuliia Varava, Y. Samokhin, Anton Savchenko, K. Diedkova, S. Kyrylenko, V. Korniienko
The application of nanotechnologies in the development of biomaterials has at present of potential interest for medical application. Among the polymers for this aim, chitosan (Ch) is one of the most promising due to its biocompatibility, biodegradability, and antibacterial modes. Electrospinning is an economy and highly reproducible procedure for the fabrication of polymeric nanofibrous membranes. This study applied the appropriate electrospinning parameters to manufacture membranes made of Ch solution in a combination of trifluoroacetic acid (TFA) and dichloromethane (DMC) as solvent systems. The ability of Ch nanofibers to influence bacterial adhesion and proliferation was enforced by the loading of silver nanoparticles (AgNPs). We demonstrated that enhancing the antibacterial potential of silver-contained Ch membranes depends on the amount of AgNPs. Otherwise, the viability and bacterial growth of the E. coli strain were lower during co-cultivation with Ch-Ag samples than S. aureus. The biofilm formation capacity was better in silver nanoparticle-free membranes. We confirmed that an increase of AgNPs content noticeable decreases the biofilm formation ability. These results demonstrate that nanofibrous Ch materials contained AgNPs in concentrations not exceeded minimum inhibitory concentrations (MIC) might be promising antibacterial material due to extensive bacterial suppression and biofilm inhibition effect.
{"title":"Antimicrobial Electrospun Chitosan Nanofibrous Membranes Functionalized with Silver Nanoparticles","authors":"Yuliia Varava, Y. Samokhin, Anton Savchenko, K. Diedkova, S. Kyrylenko, V. Korniienko","doi":"10.1109/NAP51885.2021.9568584","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568584","url":null,"abstract":"The application of nanotechnologies in the development of biomaterials has at present of potential interest for medical application. Among the polymers for this aim, chitosan (Ch) is one of the most promising due to its biocompatibility, biodegradability, and antibacterial modes. Electrospinning is an economy and highly reproducible procedure for the fabrication of polymeric nanofibrous membranes. This study applied the appropriate electrospinning parameters to manufacture membranes made of Ch solution in a combination of trifluoroacetic acid (TFA) and dichloromethane (DMC) as solvent systems. The ability of Ch nanofibers to influence bacterial adhesion and proliferation was enforced by the loading of silver nanoparticles (AgNPs). We demonstrated that enhancing the antibacterial potential of silver-contained Ch membranes depends on the amount of AgNPs. Otherwise, the viability and bacterial growth of the E. coli strain were lower during co-cultivation with Ch-Ag samples than S. aureus. The biofilm formation capacity was better in silver nanoparticle-free membranes. We confirmed that an increase of AgNPs content noticeable decreases the biofilm formation ability. These results demonstrate that nanofibrous Ch materials contained AgNPs in concentrations not exceeded minimum inhibitory concentrations (MIC) might be promising antibacterial material due to extensive bacterial suppression and biofilm inhibition effect.","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":"81263441","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/NAP51885.2021.9568544
M. Razumova, Yuliia Lunha, V. Lozovski
The dependence of calculated absorption profiles on the nanoinclusions shells characteristics allow proposing the optical control method the presence of biomolecules and their concentration in the tested bioliquid which in tiny volume being added to the prepared (in a controlled way) colloidal solution. Nanoparticles, consisting of a metallic core with dielectric nanoshells, make it possible to vary the optical resonances of such nanoparticles by varying the relative dimensions of the core and shells. For example, a monomolecular layer of a specific receptor can be attached to gold surface by a biochemical method, which is capable of selective binding with certain organic molecules (analyte) by the key-lock interactions (or the antigen-antibody interaction). Due to the subsequent binding of analyte molecules, an additional layer of biological coating will be formed. The presence of this layer changes the conditions of plasmon-polariton resonance, which will be manifested in the frequency shift of this resonance in the absorption spectra.
{"title":"An Implementation of Gold Nanoparticles with Functionalized Surface in Biosensorics","authors":"M. Razumova, Yuliia Lunha, V. Lozovski","doi":"10.1109/NAP51885.2021.9568544","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568544","url":null,"abstract":"The dependence of calculated absorption profiles on the nanoinclusions shells characteristics allow proposing the optical control method the presence of biomolecules and their concentration in the tested bioliquid which in tiny volume being added to the prepared (in a controlled way) colloidal solution. Nanoparticles, consisting of a metallic core with dielectric nanoshells, make it possible to vary the optical resonances of such nanoparticles by varying the relative dimensions of the core and shells. For example, a monomolecular layer of a specific receptor can be attached to gold surface by a biochemical method, which is capable of selective binding with certain organic molecules (analyte) by the key-lock interactions (or the antigen-antibody interaction). Due to the subsequent binding of analyte molecules, an additional layer of biological coating will be formed. The presence of this layer changes the conditions of plasmon-polariton resonance, which will be manifested in the frequency shift of this resonance in the absorption spectra.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"53 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":"81896249","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/NAP51885.2021.9568398
S. Semchuk, V. Kuryliuk, Danylo Vernygora, A. Kuryliuk, T. Tsaregradskaya
In this paper, the mechanical behavior of silicon nanowires with the hollow-core geometry was investigated using molecular dynamics simulation. The pristine Si nanowires are considered as references to compare the mechanical properties of the hollow-core structures. Our results show that hollow-core silicon nanowires with a cavity volume fraction above 50% have a larger fracture strain compared to nanowires with a smaller cavity. Under uniaxial tensile loading, the computed Young’s modulus decreases as the radius of cylindrical cavity in nanowire increases. To understand the mechanical behavior of hollow-core Si nanowires, the structural evolution of the nanowire with different cavity volume fraction was investigated. It is established that the structure of nanowires with a cavity volume of more than 50% is completely amorphous. We have shown that structural changes in nanowires are the root cause of changes in their mechanical behavior.
{"title":"Molecular Dynamics Simulation of the Uniaxial Tensile Test of Hollow-Core Silicon Nanowires","authors":"S. Semchuk, V. Kuryliuk, Danylo Vernygora, A. Kuryliuk, T. Tsaregradskaya","doi":"10.1109/NAP51885.2021.9568398","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568398","url":null,"abstract":"In this paper, the mechanical behavior of silicon nanowires with the hollow-core geometry was investigated using molecular dynamics simulation. The pristine Si nanowires are considered as references to compare the mechanical properties of the hollow-core structures. Our results show that hollow-core silicon nanowires with a cavity volume fraction above 50% have a larger fracture strain compared to nanowires with a smaller cavity. Under uniaxial tensile loading, the computed Young’s modulus decreases as the radius of cylindrical cavity in nanowire increases. To understand the mechanical behavior of hollow-core Si nanowires, the structural evolution of the nanowire with different cavity volume fraction was investigated. It is established that the structure of nanowires with a cavity volume of more than 50% is completely amorphous. We have shown that structural changes in nanowires are the root cause of changes in their mechanical behavior.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"13 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":"81920278","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/NAP51885.2021.9568506
D. Slobodianiuk, O. Prokopenko
We demonstrate both theoretically and numerically that an antiferromagnetic (AFM) spin Hall oscillator (SHO) biased by a DC current can be synchronized to an external AC signal when the oscillator’s frequency and external signal frequency are in fractional relation. This regime of SHO operation, the so-called fractional synchronization regime, can be achieved by choosing a specific ratio between AC signal frequency and the driving DC current subjected to an SHO. The obtained results could be important for the development of nanoscale terahertz-frequency AFM spintronic devices able to operate in a wide frequency range.
{"title":"Fractional Synchronization of Antiferromagnetic Spin Hall Oscillator with External AC Signal","authors":"D. Slobodianiuk, O. Prokopenko","doi":"10.1109/NAP51885.2021.9568506","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568506","url":null,"abstract":"We demonstrate both theoretically and numerically that an antiferromagnetic (AFM) spin Hall oscillator (SHO) biased by a DC current can be synchronized to an external AC signal when the oscillator’s frequency and external signal frequency are in fractional relation. This regime of SHO operation, the so-called fractional synchronization regime, can be achieved by choosing a specific ratio between AC signal frequency and the driving DC current subjected to an SHO. The obtained results could be important for the development of nanoscale terahertz-frequency AFM spintronic devices able to operate in a wide frequency range.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"190 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":"85116933","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/NAP51885.2021.9568507
I. Pazukha, D. Saltykov, Y. Shkurdoda, A. Saltykova, Valerii B. Loboda, V. V. Shchotkin, S. R. Dolgov-Gordiichuk
The paper presents the results of studies of the magnetoresistance effect and magnetic parameters of three-component film alloys based on the ferromagnetic alloy $mathrm{Fe}_{mathrm{x}}mathrm{Co}1-mathrm{x}$ and Cu with a thickness of 20-50 nm and at a concentration of cobalt atoms of $10leq cmathrm{c}_{0}leq 90$ aT.%. It is shown that for film alloys $mathrm{Fe}_{mathrm{x}}mathrm{C}_{01-mathrm{x}}$ in the entire range of studied concentrations and thicknesses at room temperature, the anisotropic nature of magnetoresistance is recorded, while for films $(mathrm{Fe}_{mathrm{x}}mathrm{C}_{01-mathrm{x}})_{0.5}mathrm{C}_{mathrm{u}0.5}$ at $xgt 0.6$ the magnetoresistance has an isotropic character. The dependences of the values of the coercive force BC and the saturation field BS on the content of Fe x atoms for film alloys $mathrm{Fe}_{mathrm{x}}mathrm{Co}1-mathrm{x}/mathrm{S}$ $Ta (mathrm{Fe}_{mathrm{x}}mathrm{c}_{01-mathrm{x}})_{0.5}mathrm{C}_{mathrm{u0.5}}/mathrm{S}$ with a thickness of 30 nm are analyzed.
本文介绍了在钴原子浓度为$10leq cmathrm{c}_{0}leq 90$ at的条件下，以厚度为20 ～ 50 nm的$mathrm{Fe}_{mathrm{x}}mathrm{Co}1-mathrm{x}$铁磁合金和Cu铁磁合金为基体的三组分薄膜合金的磁阻效应和磁性参数的研究结果。%. It is shown that for film alloys $mathrm{Fe}_{mathrm{x}}mathrm{C}_{01-mathrm{x}}$ in the entire range of studied concentrations and thicknesses at room temperature, the anisotropic nature of magnetoresistance is recorded, while for films $(mathrm{Fe}_{mathrm{x}}mathrm{C}_{01-mathrm{x}})_{0.5}mathrm{C}_{mathrm{u}0.5}$ at $xgt 0.6$ the magnetoresistance has an isotropic character. The dependences of the values of the coercive force BC and the saturation field BS on the content of Fe x atoms for film alloys $mathrm{Fe}_{mathrm{x}}mathrm{Co}1-mathrm{x}/mathrm{S}$ $Ta (mathrm{Fe}_{mathrm{x}}mathrm{c}_{01-mathrm{x}})_{0.5}mathrm{C}_{mathrm{u0.5}}/mathrm{S}$ with a thickness of 30 nm are analyzed.
{"title":"Magnetoresistive Effect and Magnetic Paraneters of Nanocrystalline Thin-film Alloys Based on Co, Fe and Cu","authors":"I. Pazukha, D. Saltykov, Y. Shkurdoda, A. Saltykova, Valerii B. Loboda, V. V. Shchotkin, S. R. Dolgov-Gordiichuk","doi":"10.1109/NAP51885.2021.9568507","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568507","url":null,"abstract":"The paper presents the results of studies of the magnetoresistance effect and magnetic parameters of three-component film alloys based on the ferromagnetic alloy $mathrm{Fe}_{mathrm{x}}mathrm{Co}1-mathrm{x}$ and Cu with a thickness of 20-50 nm and at a concentration of cobalt atoms of $10leq cmathrm{c}_{0}leq 90$ aT.%. It is shown that for film alloys $mathrm{Fe}_{mathrm{x}}mathrm{C}_{01-mathrm{x}}$ in the entire range of studied concentrations and thicknesses at room temperature, the anisotropic nature of magnetoresistance is recorded, while for films $(mathrm{Fe}_{mathrm{x}}mathrm{C}_{01-mathrm{x}})_{0.5}mathrm{C}_{mathrm{u}0.5}$ at $xgt 0.6$ the magnetoresistance has an isotropic character. The dependences of the values of the coercive force BC and the saturation field BS on the content of Fe x atoms for film alloys $mathrm{Fe}_{mathrm{x}}mathrm{Co}1-mathrm{x}/mathrm{S}$ $Ta (mathrm{Fe}_{mathrm{x}}mathrm{c}_{01-mathrm{x}})_{0.5}mathrm{C}_{mathrm{u0.5}}/mathrm{S}$ with a thickness of 30 nm are analyzed.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"52 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":"85610290","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/NAP51885.2021.9568592
Oleh Denysov, E. Tantsiura, Kamila Abuzarova, O. Korchuganova
The nanosized nickel and zinc oxides are popular materials for chemical and electronic industries. Wet chemistry methods are used for their production. Oxide precursors are metal hydroxycarbonates, that have a changing composition. As a result, hydroxycarbonates calcining oxides are formed. For the design of the technological process, the study of hydroxycarbonates composition is needed. In this work results of the zinc and nickel hydroxycarbonates composition study are presented by the volumetric method. Besides that, the SEM and X-ray investigations of nickel hydroxycarbonate are presented showing the shape of hydroxycarbonate and nano size of nickel oxide.
{"title":"Nickel and Zinc Hydroxycarbonates are Precursors of Nanoscale Oxides","authors":"Oleh Denysov, E. Tantsiura, Kamila Abuzarova, O. Korchuganova","doi":"10.1109/NAP51885.2021.9568592","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568592","url":null,"abstract":"The nanosized nickel and zinc oxides are popular materials for chemical and electronic industries. Wet chemistry methods are used for their production. Oxide precursors are metal hydroxycarbonates, that have a changing composition. As a result, hydroxycarbonates calcining oxides are formed. For the design of the technological process, the study of hydroxycarbonates composition is needed. In this work results of the zinc and nickel hydroxycarbonates composition study are presented by the volumetric method. Besides that, the SEM and X-ray investigations of nickel hydroxycarbonate are presented showing the shape of hydroxycarbonate and nano size of nickel oxide.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"18 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":"72906547","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/NAP51885.2021.9568516
O. Berdnikova, O. Kushnarova, A. Bernatskyi, Y. Polovetskyi, V. Kostin, M. Khokhlov
The article presents the results of studying the surface layers of structural steel samples alloyed with 48(WC–W2 C) + 48Cr + 4Al powder materials mixture using laser-plasma alloying technology. ROFIN-SINAR Nd:YAG-laser DY044 (Germany) with irradiation wave length λ = 1.06 μm was used for laser alloying. Equipment and technologies of laser-plasma alloying were developed at the E.O. Paton Electric Welding Institute. Detailed studies at all structural levels of grain, subgrain, dislocation structures, including phase precipitates and their stoichiometric composition, were carried out using optical, scanning electron, and microdiffraction transmission electron microscopy. It was found that the formation of crack concentrators in the treated surfaces is due to such structural factors as coarse-grained structure, chemical inhomogeneity, and the formation of dislocation density gradients in grain-boundary areas. Under the optimal mode of laser-plasma alloying of the treated surfaces, a fine-grained structure is formed with a uniform distribution of the dislocation density. In this case, the dislocation substructure is characterized by a cellular type with a cell size of 50…110 nm and by the presence of dispersed phase precipitates up to 100 nm in size in the internal volumes of grains. Dispersion of the structure, the formation of a non-disoriented cellular dislocation substructure with a uniform distribution of dislocation density, the presence of dispersed phase precipitates (nanoscale type) will contribute to an increase in crack resistance and strength characteristics due to substructural and dispersion hardening.
{"title":"Structure Features of Surface Layers in Structural Steel after Laser-Plasma Alloying with 48(WC–W2 C) + 48Cr + 4Al Powder","authors":"O. Berdnikova, O. Kushnarova, A. Bernatskyi, Y. Polovetskyi, V. Kostin, M. Khokhlov","doi":"10.1109/NAP51885.2021.9568516","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568516","url":null,"abstract":"The article presents the results of studying the surface layers of structural steel samples alloyed with 48(WC–W2 C) + 48Cr + 4Al powder materials mixture using laser-plasma alloying technology. ROFIN-SINAR Nd:YAG-laser DY044 (Germany) with irradiation wave length λ = 1.06 μm was used for laser alloying. Equipment and technologies of laser-plasma alloying were developed at the E.O. Paton Electric Welding Institute. Detailed studies at all structural levels of grain, subgrain, dislocation structures, including phase precipitates and their stoichiometric composition, were carried out using optical, scanning electron, and microdiffraction transmission electron microscopy. It was found that the formation of crack concentrators in the treated surfaces is due to such structural factors as coarse-grained structure, chemical inhomogeneity, and the formation of dislocation density gradients in grain-boundary areas. Under the optimal mode of laser-plasma alloying of the treated surfaces, a fine-grained structure is formed with a uniform distribution of the dislocation density. In this case, the dislocation substructure is characterized by a cellular type with a cell size of 50…110 nm and by the presence of dispersed phase precipitates up to 100 nm in size in the internal volumes of grains. Dispersion of the structure, the formation of a non-disoriented cellular dislocation substructure with a uniform distribution of dislocation density, the presence of dispersed phase precipitates (nanoscale type) will contribute to an increase in crack resistance and strength characteristics due to substructural and dispersion hardening.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"96 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":"76705665","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/NAP51885.2021.9568616
A. Goncharov, A. Yunda, Ivan S. Kolinko, S. Goncharova, Oleksii Fesenko
The features of modeling the processes of formation of films of refractory compounds are considered by the example of transition metal nitrides. A brief description of modern methods for modeling the growth of coatings is given. And also outlined the range of tasks to be solved.
{"title":"Features of Modeling the Processes of Formation of Films of Refractory Compounds","authors":"A. Goncharov, A. Yunda, Ivan S. Kolinko, S. Goncharova, Oleksii Fesenko","doi":"10.1109/NAP51885.2021.9568616","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568616","url":null,"abstract":"The features of modeling the processes of formation of films of refractory compounds are considered by the example of transition metal nitrides. A brief description of modern methods for modeling the growth of coatings is given. And also outlined the range of tasks to be solved.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"48 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":"82168238","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/NAP51885.2021.9568587
A. Prudnikov, O. Budnyk, V. Dmitrenko, Y. Pashkevich
The influence of intense nanosecond laser pulses on structural transformations at the interface of the nanocolumnar carbon nitride film in a supercritical fluid is investigated. The pulse intensity was varied in the range 4.7–12 mJ, while the irradiation time was 5 min. The intensive laser irradiation is known to create shock waves turning liquid into a supercritical fluid. When the intensity exceeds a threshold, some microcrystals of regular shape are formed on the film surface. SEM revealed microcrystals of about 1μm. Photoemission spectroscopy provided the relative amounts of carbon and nitrogen in microcrystals, which are similar to those in the superhard C3 N2 and C2 N compounds.
{"title":"Impact Synthesis of Carbon Nitride Diamond-like Phases in a Supercritical Fluid","authors":"A. Prudnikov, O. Budnyk, V. Dmitrenko, Y. Pashkevich","doi":"10.1109/NAP51885.2021.9568587","DOIUrl":"https://doi.org/10.1109/NAP51885.2021.9568587","url":null,"abstract":"The influence of intense nanosecond laser pulses on structural transformations at the interface of the nanocolumnar carbon nitride film in a supercritical fluid is investigated. The pulse intensity was varied in the range 4.7–12 mJ, while the irradiation time was 5 min. The intensive laser irradiation is known to create shock waves turning liquid into a supercritical fluid. When the intensity exceeds a threshold, some microcrystals of regular shape are formed on the film surface. SEM revealed microcrystals of about 1μm. Photoemission spectroscopy provided the relative amounts of carbon and nitrogen in microcrystals, which are similar to those in the superhard C3 N2 and C2 N compounds.","PeriodicalId":6735,"journal":{"name":"2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP)","volume":"4 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":"87777839","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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