Properties of carbon nanomaterials produced from gaseous raw materials using high-frequency electrodischarge processing

Богуславский, Л. З.; Rud, A. D.; Kiryan, I.M.; Nazarova, Natalia; Vinnichenko, Dmitriy

doi:10.3103/s1068375515020027

Cited by 16 publications

(3 citation statements)

References 7 publications

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“…The developed method for regulating the output current of resonant inverter can be applied to other technical applications that simultaneously require stabilization of the output current and high voltage at the output of the source. For example, electric discharge production of carbon nanomaterials from carbon-containing gases [27,28], in which a high voltage of up to 30 kV is required to close the discharge gas channel with a frequency of up to 20 kHz, or spark plasma sintering [29]. For such applications, a resonant power source with a series resonant circuit, which provides an almost constant operating current in a wide range of changes in the load voltage, is optimal [30].…”

Section: Fig 2 Dependences Of the Relative Output Current Of Resonant...mentioning

confidence: 99%

Development of method for frequency regulation of output current in high-voltage transformerless resonant chargers of capacitive energy storage devices

Vinnychenko,

Nazarova,

Vinnychenko

2024

EEJET

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The object of research is high-voltage systems of electric discharge installations for various technological purposes. The work reports solving the problem of enabling the rate of charging of a capacitive energy storage, set by the requirements of a certain high-voltage technology. The quantitative characteristics of the deviation of the output current of the resonant inverter from the set stabilized value when changing the switching frequency of inverter switches in the range of output voltage change from 0 to 20 kV were determined. Using the Fourier transform of the rectangular input voltage, the frequency regulation possibility of the output current of the charger for capacitive energy storage devices was analyzed. Estimation dependences of the output current of resonant inverter on the load resistance and frequency deviation from resonant frequency were derived. These dependences could be used to implement frequency control over the switching inverter transistors, with the help of which the given effective value of the output current of the resonant inverter is obtained. A method of frequency regulation of the output current in high-voltage transformerless resonant charging devices of capacitive energy storage devices has been developed. Special feature of this method is that it is based on the frequency dependence of reactive resistances of the inductance and capacitance of the resonant circuit connected in series. Owing to that, it makes it possible to adjust the switching frequency of the inverter’s power switches depending on the relative resistance of the load and the specified growth rate of the capacitive energy storage voltage. The results reported here could be used in the design of benches for testing the electrical strength of high-voltage cables, as well as for the construction of high-voltage transformerless chargers in systems of electric discharge impulse processing of materials

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Section: Fig 2 Dependences Of the Relative Output Current Of Resonant...mentioning

confidence: 99%

Development of method for frequency regulation of output current in high-voltage transformerless resonant chargers of capacitive energy storage devices

Vinnychenko,

Nazarova,

Vinnychenko

2024

EEJET

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“…KDP nanocrystals and carbon nanostructures (fullerenes [1-4], fullerites [5], endofullerins [6], graphenes [7][8], nanotubes [9][10]) with various synthesis methods [11][12][13][14][15][16][17][18][19] can be used as fillers for creating new composites [20][21][22][23] suitable for 3D printing technology [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Crystalline potassium dihydrogen phosphate (KDP) powders

Zolotarenko,

Matysina

et al. 2023

Poverhn.

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The article discusses the use of KDP ferroelectric crystals (phosphates and arsenates of potassium, rubidium, cesium) and their deuterated analogues in various industries, including the creation of electro-optical devices and as hydrogen sorbents. The paper describes the physical properties of KDP crystals, changes in their properties near the phase transition temperature, as well as methods for obtaining KDP nanocrystals and their application in biomedicine. The paper also states that the phase transition in KDP crystals occurs near room temperature and manifests itself in a change in their physical properties, such as dielectric constant, optical properties, and heat capacity. In addition, approaching the phase transition temperature causes a change in the crystal lattice parameters, which can lead to the appearance of anomalous effects. The structure of the unit cell of potassium dihydrogen phosphate (KH2PO4) is considered. The plots of the temperature dependence of the order parameter of spontaneous polarization and the plots of the temperature dependence of the configurational heat capacity of the crystal in the phase transition region are calculated, and the plots of the temperature of the inverse and direct dielectric susceptibility are calculated. Graphs of the order parameter, which characterizes the degree of spontaneous polarization for different temperatures, depending on the strength of the external electric field, are also calculated.

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“…Each method for the synthesis of carbon nanomaterials (CNM) has its own characteristics and makes it possible to obtain various types of nanoproducts. However, today only three methods of synthesis (plasma-chemical synthesis method in a gaseous medium or in a liquid medium, as well as a pyrolytic synthesis method) [1][2][3][4][5][6][7][8][9] are the most productive and make it possible to reliably obtain nanoproducts of a certain type CNM (fullerenes [10][11][12][13], fullerites [14], endofullerenes [15], graphenes [16][17], carbon nanotubes [18][19], carbon nanofibers, etc. ).…”

Section: Introductionmentioning

confidence: 99%

Creation of 3D-products using carbon nanostructures and 3D-printing technologies (FDM, CJP, SLA, SLS)

Zolotarenko,

Rudakova

et al. 2023

Poverhn.

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The article discusses methods for obtaining carbon nanostructures (CNS), as well as their use to create three-dimensional (3D) products using FDM, CJP, SLA, SLS technologies. The process of manufacturing consumables for 3D printing technologies (FDM, CJP, SLA, SLS) for creating new composite 3D products based on carbon nanostructures is described. The paper contains a detailed description of which methods of CNS synthesis are more productive and how they allow you to guarantee the production of one or another type of CNS. The paper analyzes the existing 3D printing technologies using CNS, developed a scheme for the full cycle of creating a 3D product containing CNS, taking into account various methods for the synthesis of CNS with the transformation of graphite or other carbon-containing material. It also describes the process of creating composite coils for FDM 3D printing from nanocomposite filaments (rigid polymer-CNS) based on a rigid polymer, which have undergone the process of preparation in a special mixer. The process of preparing consumables and printing a 3D volumetric product using FDM, CJP, SLA, SLS technologies using CNS is described. An overview of consumables for 3D products of FDM technology is presented. The analysis of composite 3D products (ceramic-CNS, rigid polymer-CNS) obtained by FDM and CJP technology was carried out. The paper also describes the three most productive methods for the synthesis of CNS: plasma-chemical synthesis in gas or liquid and pyrolytic method. These synthesis methods make it possible to guarantee the production of a certain type of CNS and have a high quality of the obtained nanoproducts. Various types of CNS are described, including soluble (fullerenes and fullerene-like structures) and insoluble nanostructures (graphenes, carbon nanotubes, carbon nanofibers, nanocomposites, etc.).

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Properties of carbon nanomaterials produced from gaseous raw materials using high-frequency electrodischarge processing

Cited by 16 publications

References 7 publications

Development of method for frequency regulation of output current in high-voltage transformerless resonant chargers of capacitive energy storage devices

Development of method for frequency regulation of output current in high-voltage transformerless resonant chargers of capacitive energy storage devices

Crystalline potassium dihydrogen phosphate (KDP) powders

Creation of 3D-products using carbon nanostructures and 3D-printing technologies (FDM, CJP, SLA, SLS)

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