The article discusses one of the promising ways to improve the efficiency of vertically integrated business entities through a comprehensive and purposeful complication of the components and internal structure of information control systems that provide the required level of viability of these facilities. This direction is based on the methodology of complexity control, which is developed by the authors of the article and is the basis of a methodological approach that describes the order of systematic and evolutionary replacement of operators — technologists with functionally equivalent information and control software and hardware systems used at existing and prospective production facilities.
{"title":"Problems and Methodological Approaches to Increasing the Viability of Production Facilities Based on the Concept of Evolutionary Management","authors":"I. Т. Kimyaev, B. V. Sokolov","doi":"10.17587/it.29.23-32","DOIUrl":"https://doi.org/10.17587/it.29.23-32","url":null,"abstract":"The article discusses one of the promising ways to improve the efficiency of vertically integrated business entities through a comprehensive and purposeful complication of the components and internal structure of information control systems that provide the required level of viability of these facilities. This direction is based on the methodology of complexity control, which is developed by the authors of the article and is the basis of a methodological approach that describes the order of systematic and evolutionary replacement of operators — technologists with functionally equivalent information and control software and hardware systems used at existing and prospective production facilities.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82512747","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}
Previously unknown error detection characteristics by types and multiplicities in modified Hamming codes code words are established. The rules for constructing this modification of Hamming codes are described. Detailed characteristic tables of codes with data vectors lengths m = 4...16 are given. The considered code's error detection properties brief analysis is given. The results obtained in the study can be effectively used in the digital computing devices with controllable structures synthesis, as well as in the self-checking concurrent error-detection (CED) circuit synthesis using the Boolean complement method. The modified Hamming codes key property is the impossibility of 100 % double error detection in all code word bits when any single and double errors that occur only in data bits are detected. That is why it is recommended, when synthesizing a CED circuit using the Boolean complement method, to convert only those functions that describe the operating functions of the diagnostic object that will form the modified Hamming code control bits, and to separate the converted and non-convertible outputs into two groups of independent outputs. The experiment results with test combinational circuits presented in the article confirm the effectiveness of their use in the CED circuit synthesis by the Boolean complement method.
{"title":"Modified Hamming Codes in Computing Devices Technical Diagnostic Systems","authors":"D. Efanov, M. Zueva","doi":"10.17587/it.29.12-22","DOIUrl":"https://doi.org/10.17587/it.29.12-22","url":null,"abstract":"Previously unknown error detection characteristics by types and multiplicities in modified Hamming codes code words are established. The rules for constructing this modification of Hamming codes are described. Detailed characteristic tables of codes with data vectors lengths m = 4...16 are given. The considered code's error detection properties brief analysis is given. The results obtained in the study can be effectively used in the digital computing devices with controllable structures synthesis, as well as in the self-checking concurrent error-detection (CED) circuit synthesis using the Boolean complement method. The modified Hamming codes key property is the impossibility of 100 % double error detection in all code word bits when any single and double errors that occur only in data bits are detected. That is why it is recommended, when synthesizing a CED circuit using the Boolean complement method, to convert only those functions that describe the operating functions of the diagnostic object that will form the modified Hamming code control bits, and to separate the converted and non-convertible outputs into two groups of independent outputs. The experiment results with test combinational circuits presented in the article confirm the effectiveness of their use in the CED circuit synthesis by the Boolean complement method.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90439018","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}
In the work, a comparative analysis of the currently used models for developing VR applications is carried out, and on the basis of its results, a number of our own key principles of successful VR development are put forward.
{"title":"Determining the Optimal Model for Developing Virtual Reality Applications","authors":"K. S. Stepanov, T. V. Stepanova","doi":"10.17587/it.29.32-38","DOIUrl":"https://doi.org/10.17587/it.29.32-38","url":null,"abstract":"In the work, a comparative analysis of the currently used models for developing VR applications is carried out, and on the basis of its results, a number of our own key principles of successful VR development are put forward.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83451717","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}
Ensuring the quality of products and increasing the level of safety in the operation of production systems are the main tasks of all industries. The second task is the most relevant for technogenic systems of increased danger, which include, among other things, the production systems of the oil and gas industry. The management of production systems and the solution of selected tasks is carried out by the decision maker, using the parameters obtained during the diagnosis and monitoring of the system. The formation of a complex of diagnostic parameters of the production system is implemented by the decision maker, taking into account the loss of information, characterized by incomplete control of the parameters. When identifying the state of the production system, the decision maker must take into account not only the values of diagnostic parameters, but also the value of the information entropy of the system that they form, since "entropy characterizes the uncertainty of control, i.e. its management quality". Thus, the identification of the state of the production system and its management are only possible with the mandatory control of the information entropy of the system by the decision maker. The latter confirms the relevance of the synthesis of control systems with control of the state of their information entropy. Consider the production system as a graphodynamic system. The data characterizing its input, output, internal state and control action will be presented in the form of graphs. Through the analysis of diagnostic parameters, the decision maker identifies the state of the production system. A certain time is spent on obtaining and analyzing diagnostic parameters, which in some cases can be significant and lead to an increase in the value of the information entropy of the controlled system, which leads to a mismatch between the actual state of the system and its image processed by the decision maker. In the conditions of big production systems, taking into account funding constraints or other reasons, the frequency of monitoring the diagnostic parameters of the system may be violated. This leads to a significant increase in the information entropy of the controlled system and, accordingly, to a low quality of its control. The proposed method for controlling a collector-beam system for collecting products from a gas condensate field makes it possible to improve the quality of its control by implementing control of its state of information entropy. The developed graph-dynamic model of data storage of a collector-beam system for collecting gas condensate field products allows the decision maker to analyze its state in any period of operation.
{"title":"Graphodynamic System with Information Entropy Control as a Means of Control of Production Systems","authors":"Y. Polishuk","doi":"10.17587/it.29.47-50","DOIUrl":"https://doi.org/10.17587/it.29.47-50","url":null,"abstract":"Ensuring the quality of products and increasing the level of safety in the operation of production systems are the main tasks of all industries. The second task is the most relevant for technogenic systems of increased danger, which include, among other things, the production systems of the oil and gas industry. The management of production systems and the solution of selected tasks is carried out by the decision maker, using the parameters obtained during the diagnosis and monitoring of the system. The formation of a complex of diagnostic parameters of the production system is implemented by the decision maker, taking into account the loss of information, characterized by incomplete control of the parameters. When identifying the state of the production system, the decision maker must take into account not only the values of diagnostic parameters, but also the value of the information entropy of the system that they form, since \"entropy characterizes the uncertainty of control, i.e. its management quality\". Thus, the identification of the state of the production system and its management are only possible with the mandatory control of the information entropy of the system by the decision maker. The latter confirms the relevance of the synthesis of control systems with control of the state of their information entropy. Consider the production system as a graphodynamic system. The data characterizing its input, output, internal state and control action will be presented in the form of graphs. Through the analysis of diagnostic parameters, the decision maker identifies the state of the production system. A certain time is spent on obtaining and analyzing diagnostic parameters, which in some cases can be significant and lead to an increase in the value of the information entropy of the controlled system, which leads to a mismatch between the actual state of the system and its image processed by the decision maker. In the conditions of big production systems, taking into account funding constraints or other reasons, the frequency of monitoring the diagnostic parameters of the system may be violated. This leads to a significant increase in the information entropy of the controlled system and, accordingly, to a low quality of its control. The proposed method for controlling a collector-beam system for collecting products from a gas condensate field makes it possible to improve the quality of its control by implementing control of its state of information entropy. The developed graph-dynamic model of data storage of a collector-beam system for collecting gas condensate field products allows the decision maker to analyze its state in any period of operation.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84828663","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 : 2022-12-29DOI: 10.17725/rensit.2022.14.497
V. I. Grachev
Information is presented about Margarita Nikolaevna Rodnikova, Doctor of Chemical Sciences, Professor, Russian Federation Honored Scientist, chief researcher of the N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, a well-known specialist in field of fundamental and applied physical chemistry liquids and solutions: basic biographical data, training in chemical Faculty of Lomonosov Moscow State University, the work in Kurnakov IGIC RAS, PhD and doctoral (chemical sciences) dissertation, authorship of more than 300 scientific papers in scientific journals (a new class of solvents with a spatial grid of hydrogen bonds has been discovered, topological methods for describing the structure of a liquid have been proposed, properties of a spatial grid of hydrogen bonds in liquids and solutions have been investigated, the role of hydrogen bonds mixed grids in biosystems and cryobiology has been revealed), membership in academic councils, participation and organization of Russian and international conferences and seminars, editorial work in scientific journals, work with postgraduates and students, management from 1980 to the present of the monthly Russian Academy of Sciences Seminar (with international participation) on the liquids and solutions structure.
{"title":"Margarita N. Rodnikova (on the 90th anniversary of her birth)","authors":"V. I. Grachev","doi":"10.17725/rensit.2022.14.497","DOIUrl":"https://doi.org/10.17725/rensit.2022.14.497","url":null,"abstract":"Information is presented about Margarita Nikolaevna Rodnikova, Doctor of Chemical Sciences, Professor, Russian Federation Honored Scientist, chief researcher of the N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, a well-known specialist in field of fundamental and applied physical chemistry liquids and solutions: basic biographical data, training in chemical Faculty of Lomonosov Moscow State University, the work in Kurnakov IGIC RAS, PhD and doctoral (chemical sciences) dissertation, authorship of more than 300 scientific papers in scientific journals (a new class of solvents with a spatial grid of hydrogen bonds has been discovered, topological methods for describing the structure of a liquid have been proposed, properties of a spatial grid of hydrogen bonds in liquids and solutions have been investigated, the role of hydrogen bonds mixed grids in biosystems and cryobiology has been revealed), membership in academic councils, participation and organization of Russian and international conferences and seminars, editorial work in scientific journals, work with postgraduates and students, management from 1980 to the present of the monthly Russian Academy of Sciences Seminar (with international participation) on the liquids and solutions structure.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75227874","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 : 2022-12-29DOI: 10.17725/rensit.2022.14.427
E. G. Rustamova, Alexey A. Gridnev, G. M. Mukhametova, A. Gulin, Maria S. Kagirina, S. Gubin
Transparent silver ink based on silver amino complex for inkjet printing has been developed. 1,2-diaminopropane, which acts as a solvent and complexing agent, significantly lowered the decomposition temperature of the silver salt and ensured the chemical stability of the resulting ink at room temperature. The annealed films were characterized by close packing and low electrical resistance values (8.5 μOhm·cm at an annealing temperature of 150°C). The ink provides productive inkjet printing while maintaining stable operation of the print head nozzles.
{"title":"Synthesis of conductive silver ink with a low sintering temperature for inkjet printing applications","authors":"E. G. Rustamova, Alexey A. Gridnev, G. M. Mukhametova, A. Gulin, Maria S. Kagirina, S. Gubin","doi":"10.17725/rensit.2022.14.427","DOIUrl":"https://doi.org/10.17725/rensit.2022.14.427","url":null,"abstract":"Transparent silver ink based on silver amino complex for inkjet printing has been developed. 1,2-diaminopropane, which acts as a solvent and complexing agent, significantly lowered the decomposition temperature of the silver salt and ensured the chemical stability of the resulting ink at room temperature. The annealed films were characterized by close packing and low electrical resistance values (8.5 μOhm·cm at an annealing temperature of 150°C). The ink provides productive inkjet printing while maintaining stable operation of the print head nozzles.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73154037","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 : 2022-12-29DOI: 10.17725/rensit.2022.14.351
Dmitry V. Polozov, D. A. Gabrielyan, A. Safin, D. Kalyabin
The article investigates the scheme of excitation of an electromagnetic field with circular polarization due to crossed strip transmission lines. Two variants are compared: coplanar and microstrip transmission lines that excite circular polarization of the magnetic field in the space above the intersection of strip structures. The degree of ellipticity of the field at the intersection of strip structures can be changed by changing the phase mismatch between exciting oscillation sources. Modeling of these devices in the computer-aided design system made it possible to quantify the amplitudes of the components of the electromagnetic field, from which the ellipticity coefficient was calculated at different values of frequency and phase. The obtained results allow us to determine the conditions necessary for the realization of circular polarization of the magnetic field. The studied structures are planned to be used in an integral design to excite circular polarization oscillations in magnetic micro- and nanostructures.
{"title":"Excitation of electromagnetic waves of circular polarization by stripline transmission lines","authors":"Dmitry V. Polozov, D. A. Gabrielyan, A. Safin, D. Kalyabin","doi":"10.17725/rensit.2022.14.351","DOIUrl":"https://doi.org/10.17725/rensit.2022.14.351","url":null,"abstract":"The article investigates the scheme of excitation of an electromagnetic field with circular polarization due to crossed strip transmission lines. Two variants are compared: coplanar and microstrip transmission lines that excite circular polarization of the magnetic field in the space above the intersection of strip structures. The degree of ellipticity of the field at the intersection of strip structures can be changed by changing the phase mismatch between exciting oscillation sources. Modeling of these devices in the computer-aided design system made it possible to quantify the amplitudes of the components of the electromagnetic field, from which the ellipticity coefficient was calculated at different values of frequency and phase. The obtained results allow us to determine the conditions necessary for the realization of circular polarization of the magnetic field. The studied structures are planned to be used in an integral design to excite circular polarization oscillations in magnetic micro- and nanostructures.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82245957","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 : 2022-12-29DOI: 10.17725/rensit.2022.14.373
A. Volvach, L. Kogan, T. Zaboronkova
A method for predicting earthquakes accompanied by tsunamis based on changes in the statistical properties of the Earth's magnetic field is proposed. Geomagnetic field is analyzed using the measurements taken a few days before the earthquake in the Pacific Ocean. With the help of a statistical functional, which allows one to study the variations in the level of chaos in the random process, the arising a set of structures with a high degree of determinism is revealed. The properties of these structuews can be interpreted as precursors of an earthquake accompanied by a tsunami.
{"title":"Statistical properties of the earth's magnetic field before an earthquake accompanied by a tsunami","authors":"A. Volvach, L. Kogan, T. Zaboronkova","doi":"10.17725/rensit.2022.14.373","DOIUrl":"https://doi.org/10.17725/rensit.2022.14.373","url":null,"abstract":"A method for predicting earthquakes accompanied by tsunamis based on changes in the statistical properties of the Earth's magnetic field is proposed. Geomagnetic field is analyzed using the measurements taken a few days before the earthquake in the Pacific Ocean. With the help of a statistical functional, which allows one to study the variations in the level of chaos in the random process, the arising a set of structures with a high degree of determinism is revealed. The properties of these structuews can be interpreted as precursors of an earthquake accompanied by a tsunami.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86850947","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 : 2022-12-29DOI: 10.17725/rensit.2022.14.415
A. A. Khachaturov, A. Fionov, V. Kolesov, E. E. Potapov, S. Safonov, Rustem T. Tlegenov
Composite materials based on elastomeric matrices (sulphur-regulated chloroprene rubber - PCP and cold curing polydimethylsiloxane - SKTN-A) and magnetic fillers: hard magnetic (SmCo, NdFeB) and soft magnetic (natural magnetite Fe3O4, ZnNiCo-ferrite) in the concentration range of 30…100 mass parts per 100 mass parts of the elastomeric matrix have been obtained. The kinetics of curing of the considered elastomeric compositions was studied, on the basis of which the optimal molding modes were proposed. The samples were molded both in the presence of a magnetic field up to 0.3 T and without it. It has been established that the viscosity of the elastomeric matrix at various stages of curing significantly affects the microstructure and properties of the resulting composites. The electrophysical and magnetic properties of the samples have been studied. It is shown that the degree of structuring, which is directly related to the anisotropy of the characteristics under study, depends on the type of matrix used and decreases in the series SKTN-PCP. The studied materials can be used as "smart" materials controlled by an external influence (magnetic or electric field).
{"title":"Magnetically Structured Composite Materials Based on Elastomeric Matrices with Different Viscoelastic Properties","authors":"A. A. Khachaturov, A. Fionov, V. Kolesov, E. E. Potapov, S. Safonov, Rustem T. Tlegenov","doi":"10.17725/rensit.2022.14.415","DOIUrl":"https://doi.org/10.17725/rensit.2022.14.415","url":null,"abstract":"Composite materials based on elastomeric matrices (sulphur-regulated chloroprene rubber - PCP and cold curing polydimethylsiloxane - SKTN-A) and magnetic fillers: hard magnetic (SmCo, NdFeB) and soft magnetic (natural magnetite Fe3O4, ZnNiCo-ferrite) in the concentration range of 30…100 mass parts per 100 mass parts of the elastomeric matrix have been obtained. The kinetics of curing of the considered elastomeric compositions was studied, on the basis of which the optimal molding modes were proposed. The samples were molded both in the presence of a magnetic field up to 0.3 T and without it. It has been established that the viscosity of the elastomeric matrix at various stages of curing significantly affects the microstructure and properties of the resulting composites. The electrophysical and magnetic properties of the samples have been studied. It is shown that the degree of structuring, which is directly related to the anisotropy of the characteristics under study, depends on the type of matrix used and decreases in the series SKTN-PCP. The studied materials can be used as \"smart\" materials controlled by an external influence (magnetic or electric field).","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81920336","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 : 2022-12-29DOI: 10.17725/rensit.2022.14.381
V. Nebol’sin, Vladimir A. Yuriev, N. Swaikat, V. V. Korneeva, Evgeniy N. Vasnin
The paper provides a physical justification for the wettability conditions for a crystalline surface of a limited area by a small-volume catalytic liquid at the end of a growing nanowires (NW) characterized by a contact angle β, which contributes to a fundamental understanding of the nature of the contact angle of catalyst drops at the top of the NW. It is shown that under the conditions of stationary growth of NWs with a transverse singular face, there are only values of the angles β and γ (the angle of inclination of the side surface of the crystal to this face), which correspond to the minimum increment of the free energy of the three-phase system αLVcosβ + αSL = αSVcosγ and determine the stability of the catalyst drop at the top of the NW. With the growth of cylindrical NWs, the conditions of indifferent equilibrium are realized at the drop wetting perimeter. A drop, due to the dissolution of a crystallizing substance or its separation from a liquid solution, can take an equilibrium shape with a contact angle β that does not satisfy the equilibrium contact angle condition θ in the Young equation. A concentric break (rib) at the NW tip should increase the observed wetting angle θ and lead to contact angle hysteresis. The restrictions imposed on the value of the contact angle of a stable catalyst drop at the top of the NW are determined. The catalyst drop will take an equilibrium shape if the hysteresis angle β is in the range θ < β ≤ θ' + γ (θ' is the wetting angle of the NW side walls). For the growth of semiconductor NWs in the form of a straight cylinder, γ = 90° and therefore always β > 90°. It is shown that the direction of displacement of the three-phase line relative to the droplet surface is determined by the growth angle φ0: for the nonwetting growth mode of NWs (with a transverse face) φ0 = β – γ; for the wetting growth mode (with the end surface curved near the three-phase line)
{"title":"On the Stability of Catalyst Drops at the Vapor-Liquid-Solid Contact during the Nanowires Growth","authors":"V. Nebol’sin, Vladimir A. Yuriev, N. Swaikat, V. V. Korneeva, Evgeniy N. Vasnin","doi":"10.17725/rensit.2022.14.381","DOIUrl":"https://doi.org/10.17725/rensit.2022.14.381","url":null,"abstract":"The paper provides a physical justification for the wettability conditions for a crystalline surface of a limited area by a small-volume catalytic liquid at the end of a growing nanowires (NW) characterized by a contact angle β, which contributes to a fundamental understanding of the nature of the contact angle of catalyst drops at the top of the NW. It is shown that under the conditions of stationary growth of NWs with a transverse singular face, there are only values of the angles β and γ (the angle of inclination of the side surface of the crystal to this face), which correspond to the minimum increment of the free energy of the three-phase system αLVcosβ + αSL = αSVcosγ and determine the stability of the catalyst drop at the top of the NW. With the growth of cylindrical NWs, the conditions of indifferent equilibrium are realized at the drop wetting perimeter. A drop, due to the dissolution of a crystallizing substance or its separation from a liquid solution, can take an equilibrium shape with a contact angle β that does not satisfy the equilibrium contact angle condition θ in the Young equation. A concentric break (rib) at the NW tip should increase the observed wetting angle θ and lead to contact angle hysteresis. The restrictions imposed on the value of the contact angle of a stable catalyst drop at the top of the NW are determined. The catalyst drop will take an equilibrium shape if the hysteresis angle β is in the range θ < β ≤ θ' + γ (θ' is the wetting angle of the NW side walls). For the growth of semiconductor NWs in the form of a straight cylinder, γ = 90° and therefore always β > 90°. It is shown that the direction of displacement of the three-phase line relative to the droplet surface is determined by the growth angle φ0: for the nonwetting growth mode of NWs (with a transverse face) φ0 = β – γ; for the wetting growth mode (with the end surface curved near the three-phase line)","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75026278","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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