INVERSION OF THE ELECTRON ENERGY DISTRIBUTION IN HOLLOW CATHODE GLOW DISCHARGE IN NITROGEN-SULFUR HEXAFLUORIDE GAS MIXTURE | I.A.Soloshenko, V.Yu.Bazhenov, V.A.Khomich, V.V.Tsiolko, A.F.Tarasenko, A.G.Terent’eva, A.G.Kalyuzhnaya, A.I.Shchedrin |
COMPONENT CONTENT OF ACTIVE PARTICLES IN PLASMA-CHEMICAL REACTOR BASED ON A VOLUME BARRIER DISCHARGE | I.A.Soloshenko, V.V.Tsiolko, S.S.Pogulay, A.G.Terent’eva , V.Yu.Bazhenov , A.I.Shchedrin , A.V.Ryabtsev , A.I. Kuzmichev |
UTILIZATION OF ULTRAVIOLET RADIATION OF COLD HOLLOW CATHODE GLOW DISCHARGE PLASMA FOR WATER DISINFECTION | I.A.Soloshenko, V.Yu.Bazhenov , V.A.Khomich , V.V.Tsiolko, N.G.Potapchenko, V.V.Goncharuk |
INVERSION OF THE ELECTRON ENERGY DISTRIBUTION IN HOLLOW-CATHODE GLOW DISCHARGE IN NITROGEN–SULFUR HEXAFLUORIDE GAS MIXTURE | V. Yu. Bazhenov, A. G. Kalyuzhnaya, I. A. Soloshenko, A. F. Tarasenko, A. G. Terent’eva, V. V. Tsiolko, and A. I. Shchedrin |
THEORETICAL AND EXPERIMENTAL INVESTIGATION OF THE COMPONENT CONTENT OF ACTIVE PARTICLES GENERATED BY BARRIER DISCHARGE IN DRY AND WET AIR IN THE REMOTE CHAMBER | I.A Soloshenko, V.V.Tsiolko, V.Yu. Bazhenov, A.G. Terentyeva, A.I. Shchedrin, A.V. Ryabtsev, A.I. Kuzmichev |
FEATURES OF STERILIZATION USING LOW PRESSURE DC DISCHARGE HYDROGEN PEROXIDE PLASMA |
I.A Soloshenko, V.V.Tsiolko, V.A.Khomich, V.Yu.Bazhenov, A.V.Ryabtsev , A.I.Schedrin, I.L.Mikhno |
V.Yu. Bazhenov, A.V. Ryabtsev, I.A. Soloshenko, V.A. Khomich, V.V. Tsiolko, A.I. Shchedrin, A. I. Kuzmichev, V.I. Kryzhanovsky, I. L. Mihno |
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V.Yu. Bazhenov, A.V. Ryabtsev, I.A. Soloshenko, A.G. Terentyeva, V.A. Khomich, V.V. Tsiolko, A.I. Shchedrin |
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V.Yu. Bazhenov, A.I. Kuzmichev, V.I. Kryzhanovsky, I.L. Mihno, A.V. Ryabtsev, I.A. Soloshenko, V.A. Khomich, V.V. Tsiolko, A.I. Shchedrin |
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V.Yu. Bazhenov, A.V. Ryabtsev, I.A. Soloshenko, A.G. Terentyeva, V.V. Tsiolko, A.I. Shchedrin |
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STERILIZATION BY PLASMA OF THE LOW PRESSURE DISCHARGE GLOWING IN HYDROGEN PEROXIDE VAPOR |
I.A Soloshenko, V.V.Tsiolko, V.A.Khomich, V.Yu. Bazhenov, A.V.Ryabtsev , A.I.Shchedrin, I.L.Mikhno |
STERILIZATION OF MEDICAL PRODUCTS IN LOW--PRESSURE GLOW DISCHARGES |
I. A. Soloshenko, V. V. Tsiolko, V. A. Khomich, A. I. Shchedrin, A. V. Ryabtsev, V. Yu. Bazhenov, and I. L. Mikhno |
EXPERIMENTAL AND THEORETICAL INVESTIGATION OF COLD STERILIZATION OF MEDICAL INSTRUMENTS BY PLASMA DC GLOW DISCHARGE |
I.O.Soloshenko, V.A.Khomich, V.V.Tsiolko, I.L.Mikhno, A.I.Shchedrin, A.V.Ryabtsev, V.Yu.Bazhenov |
COLD STERILIZATION OF MEDICAL DEVICES AND MATERIALS BY PLASMA DC GLOW DISCHARGE |
A.V.Khomich, I.A.Soloshenko, V.V.Tsiolko, I.L.Mikhno |
INVESTIGATION OF PRINCIPAL FACTORS OF THE STERILIZATION BY PLASMA DC GLOW DISCHARGE |
V.A.Khomich, I.A.Soloshenko, V.V.Tsiolko, I.L.Mikhno |
Inversion of the Electron Energy Distribution in Hollow Cathode Glow Discharge in Nitrogen-Sulfur Hexafluoride Gas MixtureI.A.Soloshenko, V.Yu.Bazhenov, V.A.Khomich, V.V.Tsiolko, A.F.Tarasenko, A.G.Terent’eva, A.G.Kalyuzhnaya, A.I.Shchedrin
Institute of Physics NAS Ukraine, pr. Nauki 46, 03022, Kiev, Ukraine,
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Abstract—The mechanism for the formation of the inverse electron distribution function is proposed and real-ized experimentally in a nitrogen plasma of a hollow-cathode glow discharge. It is shown theoretically and experimentally that, for a broad range of the parameters of an N 2 discharge, it is possible to form a significant dip in the profile of the electron distribution function in the energy range e = 2–4 eV and, accordingly, to pro-duce the inverse distribution with df(e)/de > 0. The formation of a dip is associated with both the vibrational excitation of N 2 molecules and the characteristic features of a hollow-cathode glow discharge. In such a dis-charge, the applied voltage drops preferentially across a narrow cathode sheath. In the main discharge region, the electric
field E is weak (E < 0.1 V/cm at a pressure of about p ~ 0.1 torr) and does not heat the discharge plasma. The gas is ionized and the
ionization-produced electrons are heated by a beam of fast electrons (with an energy of about 400 eV) emitted from the cathode. A high-energy
electron beam plays an important role in the formation of a dip in the profile of the electron distribution function in the energy
range in which the cross section for the vibrational excitation of nitrogen molecules is maximum. A plasma with an inverted electron
distribution function can be used to create a population inversion in which more impurity molecules and atoms will exist in electronically
excited states.
(pub08.pdf, 191
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Abstract In the present proceedings
the experimental and theoretical investigations of sterilization
of medical instruments by a barrier discharges were performed. It
is shown that moistening the air results in essential growth of
sterilization efficiency, and this effect may be due to formation
of hydrogen peroxide H2O2, nitric HNO3 and
nitrous HNO2 acids, HO2NO2
radicals and such biologically active particles as N2O4
and N2O5 in the discharge.
(pub05.zip, 64
377 Bytes)
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Abstract In the present proceeding
experimental and theoretical studies of electron energy distribution
function in stationary glow discharge with hollow cathode in nitrogen
and oxygen are performed. It is shown that in such discharge in
nitrogen in energy range E = 2 ... 4 eV significant gap and respective
inverse region appears on the EDF, which is due to vibrational excitation
of N2 molecules. On the contrary, in oxygen the electron distribution
function is monotonous due to its cutoff by the processes of excitation
of lower metastable electron levels of O2 having low threshold energy,
and also due to small excitation cross section for vibrational levels
of oxygen molecule.
(pub06.zip, 156
397 Bytes)
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Abstract In the present proceedings
the experimental and theoretical investigations of the features
of sterilization by plasma of glow discharge in hydrogen peroxide
vapor were performed. It is determined that in such system main
role in sterilization is performed by active particles, rather than
by UV radiation of the plasma (as it does in case of discharge in
gases, particularly, air and oxygen). It is shown that efficiency
of sterilization by discharge plasma in hydrogen peroxide vapor
is higher than that by plasma of the discharge in gases – sterilization
time of open surface is 2-3 times shorter, and that of sterilization
of packed articles is shorter by factor about 10. Accomplished calculations
of the plasma component content in the discharge in hydrogen peroxide
have shown that sterilization efficiency enhancement can be due
to fact that concentrations of such biologically active particles,
as atomic oxygen and oxygen molecules excited to lower metastable
states, reach value of ~ 1014...1015 cm-3, which is 2-3 orders of
magnitude higher than that in oxygen plasma at the same parameters
of the discharge.
(pub07.zip, 132
889 Bytes)
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Abstract. Results are presented
from experimental and theoretical studies of the sterilization of
medical products by the plasmas of dc glow discharges in different
gas media. The sterilization efficiency is obtained as a function
of discharge parameters. The plasma composition in discharges in
N2 and O2 is investigated under the operating conditions of a
plasma sterilizer. It is shown that free surfaces of medical products
are sterilized primarily by UV radiation from the discharge plasma,
while an important role in sterilization of products with complicated
shapes is played by such chemically active particles as oxygen atoms
and electronically excited O2 molecules.
© 2000 MAIK “Nauka/ Interperiodica”.
(pub04.pdf, 194
482 Bytes)
Abstract. This report
presents both the results of experimental investigation of the features of sterilization
by plasma DC glow discharge: a) dependencies of the efficiency of plasma sterilization on
discharge parameters; b) ratio between main sterilization factors (charged particles,
neutral chemical active particles and ultraviolet (UV) radiation), and the results of
numerical simulation of component composition.
(pub01.zip,
35 547 Bytes)
ABSTRACT This report presents
the results of investigation the efficiency of sterilization of medical devices directly
in the plasma of DC glow discharge. Sterilization regime is independent on the discharge
chamber loading by processed instruments. It is shown that effective sterilization is
reached using either air or other gases (argon, nitrogen, oxygen) with comparatively low
power density (0.003 - 0.03 W/cm3). Sterilization time comprises less than 10 minutes.
Temperature of the processed instruments does not exceed 650C. Usage of this discharge
results in essential simplifying of the sterilizer, lowering its cost and increasing its
safety for servicing personnel and also improvement of its operational characteristics in
comparison with the devices utilizing RF or VHF discharges.
( pub02.zip,
19 286 Bytes)
Abstract. This report
presents the results of investigation the factors of the sterilization of medical devices
directly in the plasma of DC glow discharge. The researches have provided convincing
evidence that main sterilization factor is presented by ultraviolet radiation of the
plasma in wavelength range of 160 nm - 240nm for opened surface and active electroneutral
particles for the instruments with complex shape or long narrow tubes. It is shown that
effective sterilization is possible using either air or other gases (argon, nitrogen,
oxygen, carbon dioxide, hydrogen) with comparatively low power density (Wd=0,003
(0,03W/cc).
(pub03.zip,
16 216 Bytes)
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