200 mg/min) of the CB feeding rate is caused by the breakdown of a stable discharge operation. Besides, it increases sharply the metal erosion of the anode surface. The fullerene yield and all the operative characteristics of the setup depend strongly on the way for inserting the CB into plasma.">

Presentation is loading. Please wait.

Presentation is loading. Please wait.

PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Alexander V. ELETSKY. Supervisor of the Project’s Research Constituent. Scientific.

Similar presentations


Presentation on theme: "PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Alexander V. ELETSKY. Supervisor of the Project’s Research Constituent. Scientific."— Presentation transcript:

1 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Alexander V. ELETSKY. Supervisor of the Project’s Research Constituent. Scientific research in Research and Educational Center "Plasma"

2 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Plasma fullerene production from powdered carbon black carbon black Experimental setup.1 – cathode; 2 – anode; 3, 4, 5, 6 – inlet channels; 7 – power supply; 8 – water-cooled chamber; 9 – movable soot collector; 10 – carbon black feeder; 11,12 – gas flow controllers; 13,14 – pressure gauges; 15 – gas cylinder; 16 – plasma jet Carbon black powder (99.9% acetylene carbon black, specific surface area of 80 m 2 /g, “Alfa Aesar”). The inter- electrode gap is kept in the interval 1-3 mm. The plasmatron is powered by 12kW DC power supply. The total buffer gas (usually Ar) flow rate is kept at l/min. Plasmatron AP-3 (“A-Flame Corporation”) has been used

3 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Plasma fullerene production from powdered carbon black Fullerene yield vs carbon black rate analyzed by HPLC method An lowering in fullerenes yield at enhanced level (> 200 mg/min) of the CB feeding rate is caused by the breakdown of a stable discharge operation. Besides, it increases sharply the metal erosion of the anode surface. The fullerene yield and all the operative characteristics of the setup depend strongly on the way for inserting the CB into plasma.

4 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Plasma fullerene production from powdered carbon black carbon black Theoretical analysis of mechanism of carbon particle vaporization of in plasma leads to conclusions: 1. Vaporization time depends critically on both parameters: the size of particle R o and the plasma temperature T p. 2. Vaporization is impossible if the plasma temperature T p < T l. For example, for a carbon particle of radius R o = 5  m (  = 2.2 g/cm 3 ; W = 30 kJ/g) in hot He (Ar) or mixture of these gases the vaporization time depends on the gas carrier ranging from s (in the case of He) to s (in the case of Ar). 3.Vaporization rate is inversely proportional to the radius of particle, so that the slowest stage of the vaporization relates to the initial period, when the radius of particle is close to the initial one.

5 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" X-ray diffraction investigation of fullerite structure The powered fullerite C 60 polycrystal sample was studied by X-ray diffraction using Cu K  radiation X-ray diffraction picture of simple cubic phase of fullerite C 60 obtained using Cu K  radiation Solid line: X-ray diffraction picture for fullerite C 60 ; broken line: result of the full profile analysis

6 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Investigation of plasma ordered dusty structures The processes of creation of ordered plasma dust structures in glow discharge were studied, in particular, in dependencies on form, size, condition (phase) of such structures as function from electro kinetic and vacuum conditions in plasma generating medium were investigated. The special experimental set up was developed controlled by personal computer with corresponding instrument interfaces based on LabView graphical environment, providing the simultaneous control of optical and electrical parameters of the plasma, synchronized with the moment of particles injection or registration of structure image.

7 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Investigation of plasma ordered dusty structures There have been found new earlier unknown regularities in conditions of mutual influence of plasma medium characteristics on parameters of "plasma crystal" and vice versa. The dependence of structure image area (S), neon spectral line (I665.2 nm ) intensity and H  intensity on discharge burning time in relative units. Total relative change is : for H  intensity 14%, for neon line- 34%; S 3.5 times increases; discharge power does not change. Particle injected five times every 2 minutes. “a”- first injection, “b”-25 injections,”c”-50 injections.

8 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Diagnostics of spatially inhomogeneous plasma Some innovations were introduced into the automated installation for spectroscopic diagnostics of plasma, based on high resolution spectrometer, spatial scanning block and controlled by PC and LabView graphical environment. Panel of VI “Data load and processing”. Hg spectral line profiles for different spatial positions

9 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Diagnostics of spatially inhomogeneous plasma The received experimental data array is processed by rational joint algorithm, which allows to decrease the processing time as well as the noise influence to results. Restored profile of Tl and Hg spectral lines for different spatial points,which allows to find spatial distribution of atom and electron densities

10 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Gas discharge plasma kinetic research The research is targeting onto: 1. Study of plasma discharge conditions favorite for the formation of diamond like films 2. Determination of radial dependencies of low pressure glow discharge parameters in absence and presence of magnetic field Setup for studying the electron kinetics in glow discharge Results: 1.Two setups for diamond like film deposition have been built and tested. 2. Staying striations in Ne discharge have been discovered

11 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Gas discharge plasma kinetic research 3. Electron energy distribution function (EEDF) of glow discharge in Ne at the current of mA and the pressure of 1 Torr has been measured and calculated in the case of presence and absence of a high magnitude magnetic field. It was stated that the applied magnetic field changes the EEDF from non-local to the local form. Setup for studying the discharge in crossing fields 4. The experimental setup for investigation of the cathod region of glow discharge has been built. Preliminary measurements of the EEDF and the profile of the potential in glow discharge in Ne at the current of mA and pressure of 1 Torr have been performed

12 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Investigation of tools for plasma control The aim: Development of problem-oriented generators of low temperature plasma Results: 1. Development of probe diagnostics of multi-component plasma using dynamic probe characteristics (frequency of 1  10 MHz). Experimental setup for probe diagnostics 2. The method of plasma retention by magnetic field of specific configuration was developed and tested. 3. The set up for plasma fullerene production was developed

13 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Laser formation of an ion beam for nanotechnologies Our purpose is to improve the resolution of the ion beam lithography. We propose: 1)To make the initial beam as atomic, but not ionic one.. 2)To collimate the atomic beam through the laser transversal cooling. 3)To ionize the atomic beam formed by the same laser. Schematic representation of the formation method proposed. An atomic beam from oven is subjected to the preliminary collimation by diaphragm facility. Then the beam is collimated by the transverse laser irradiation and cooling. The highly collimated atomic beam is ionized by the focussed radiation of the same laser. The ion beam produced,having almost no chromatic aberration, is focussed by a standard ion optical device.

14 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Emission characteristics of carbon nanotube-based cathods Current - voltage characteristics for nano-tube cathodes deviate from famous Fowler – Nordheim law. Good emission properties of CNT-based cathodes are caused by their favorite geometry. We study the influence of spread in geometry on the emission characteristics. Deviation on Fowler – Nordheim Dependence

15 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Plasma production and modification of films of transition metals oxides Technologies for generation of nanostructures (carbon nanotubes and amorphous-like films) in controlled conditions were experimental tested. The first experiments gave the first samples of structures, their analysis is carried out and the modification of technological methods of generation of nanostructures are developing; the realization of these technologies is scheduled on the following stages of work. Influence of thermal treatment on absorption coefficient of VO 2 film 1-without treatment, о С, о С, о С

16 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Low temperature plasma for ecology and biomedical applications for ecology and biomedical applications The aim of the project is development of a source of microplasma spherical formation less than 1 mm in diameter. It is reached by use of a sharpened cathode with a small curvature radius. Results: 1. Three types of experimental devices have been built; the preliminary test investigations have shown their applicability. 2. Microplasma source of coherent radiation has been manufactured and tested

17 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Low temperature plasma for ecology and biomedical applications for ecology and biomedical applications 3. A source of a microplasma stream on the basis of the sharpened anode plasmatron have been developed and studied

18 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Plasma processing of organic wastes of timber industry and treating mineral raw materials timber industry and treating mineral raw materials The aim of the project is twofold: development of technology for utilization of timber industry wastes and treatment of mineral raw material resulting in metal production. The results: 1. The specific energy cost for extraction of magnetite concentrate by wet timber at various mass ratio of concentrate has been determined. Specific energy cost (by 1 kg iron) for extraction of magnetite concentrate (67%Fe) by wet timber vs mass ratio of concentrate to wood with air presence. The degree of reduction is shown at the relevant points

19 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Plasma processing of organic wastes of timber industry and treating mineral raw materials timber industry and treating mineral raw materials 2. The pilot experimental setup for investigation of reduction of iron concentrate has been built and tested The results obtained will be used for designing the industrial facility with productivity up to 1000 kg iron per hour for introduction at the Kostomuksha industrial plant.

20 PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma"


Download ppt "PETROZAVODSK STATE UNIVERSITYResearch and Educational Center "Plasma" Alexander V. ELETSKY. Supervisor of the Project’s Research Constituent. Scientific."

Similar presentations


Ads by Google