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Barankova, Hana
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Publications (10 of 118) Show all publications
Baránková, H., Bardos, L. & Bardos, A. (2018). Non-Conventional Atmospheric Pressure Plasma Sources for Production of Hydrogen. MRS ADVANCES, 3(18), 921-929
Open this publication in new window or tab >>Non-Conventional Atmospheric Pressure Plasma Sources for Production of Hydrogen
2018 (English)In: MRS ADVANCES, ISSN 2059-8521, Vol. 3, no 18, p. 921-929Article in journal (Refereed) Published
Abstract [en]

The atmospheric pressure plasma sources with a coaxial geometry were used for generation of the radio frequency, microwave and pulsed dc plasmas inside water and aqueous solutions. Pulsed dc plasma generated in ethanol-water mixtures leads to production of the hydrogen-rich synthesis gas with hydrogen content up to 65 % The effect of various plasma generation regimes on the performance of plasma, on the hydrogen production efficiency and on the hydrogen-rich synthesis gas production was examined. A role of the composition of the ethanol-water mixture was investigated.

Place, publisher, year, edition, pages
Cambridge University Press, 2018
Keywords
plasma-enhanced CVD (PECVD) (chemical reaction), ethanol, energetic material
National Category
Fusion, Plasma and Space Physics Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-353197 (URN)10.1557/adv.2018.103 (DOI)000430349900001 ()
Funder
J. Gust. Richert stiftelse
Available from: 2018-06-11 Created: 2018-06-11 Last updated: 2018-06-14Bibliographically approved
Barankova, H., Bardos, L., Silins, K. & Bardos, A. (2018). Reactive Deposition of TiN Films by Magnetron with Magnetized Hollow Cathode Enhanced Target. Vacuum, 152, 123-127
Open this publication in new window or tab >>Reactive Deposition of TiN Films by Magnetron with Magnetized Hollow Cathode Enhanced Target
2018 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 152, p. 123-127Article in journal (Refereed) Published
Abstract [en]

Magnetized Hollow Cathode Activated Magnetron in which the target is coupled with the hollow cathode magnetized by the magnetic field of the magnetron was tested in the reactive process of TiN deposition. Increased deposition rate compared to the Ti metal deposition rate was confirmed. The depositions as well as optical measurements were performed at several pressures in the reactor. The results of the TiN reactive deposition are presented and discussed, including the TiN deposition in pure nitrogen.

Keywords
Ionized magnetron, Reactive deposition in ionized magnetron, Magnetized hollow cathode, Hollow cathode activated magnetron, Hollow cathode enhanced target
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:uu:diva-340514 (URN)10.1016/j.vacuum.2018.03.010 (DOI)000432499100018 ()
Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-08-17Bibliographically approved
Bardos, L., Baránková, H. & Bardos, A. (2017). Production of Hydrogen-Rich Synthesis Gas by Pulsed Atmospheric Plasma Submerged in Mixture of Water with Ethanol. Plasma chemistry and plasma processing, 37(1), 115-123
Open this publication in new window or tab >>Production of Hydrogen-Rich Synthesis Gas by Pulsed Atmospheric Plasma Submerged in Mixture of Water with Ethanol
2017 (English)In: Plasma chemistry and plasma processing, ISSN 0272-4324, E-ISSN 1572-8986, Vol. 37, no 1, p. 115-123Article in journal (Refereed) Published
Abstract [en]

Hydrogen-rich synthesis gas was produced by pulsed dc plasma submerged into ethanol-water mixtures using an original system with a coaxial geometry. The ignition of the discharge is immediately followed by production of hydrogen and after a short time necessary for filling the outlet tubing a flame can be ignited. No auxiliary gas was used for the reforming process. The synthesis gas containing up to 60% of hydrogen was formed, at the outflow rate of 250 sccm at the average power as low as 10 W. The hydrogen production efficiency corresponds to 12 kWh/kg H-2.

Keywords
Plasma discharge in liquid, Hydrogen production, Synthesis gas, Ethanol reforming, Pulsed plasma
National Category
Fusion, Plasma and Space Physics Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-316425 (URN)10.1007/s11090-016-9766-6 (DOI)000393053800008 ()
Available from: 2017-03-01 Created: 2017-03-01 Last updated: 2017-11-29Bibliographically approved
Silins, K., Barankova, H. & Bardos, L. (2017). Protective amorphous carbon coatings on glass substrates. AIP Advances, 7(11), Article ID 115206.
Open this publication in new window or tab >>Protective amorphous carbon coatings on glass substrates
2017 (English)In: AIP Advances, ISSN 2158-3226, E-ISSN 2158-3226, Vol. 7, no 11, article id 115206Article in journal (Refereed) Published
Abstract [en]

Thick amorphous carbon films were deposited by the Magnets-in-Motion (M-M) rf linear hollow cathode at varying acetylene contents in Ar in a hybrid PVD/PE-CVD process directly on glass substrates. The hollow cathode plates manufactured from graphite were used as the PVD target. The measurements show that the films can reach thickness of up to 50 mu m at deposition rates of up to 2.5 mu m/min. Scratch test measurements confirm that well adhering films several mu m thick can be achieved at C2H2 contents of up to 0.5%.

Place, publisher, year, edition, pages
USA: American Institute of Physics (AIP), 2017
National Category
Manufacturing, Surface and Joining Technology
Research subject
Engineering Science with specialization in Tribo Materials
Identifiers
urn:nbn:se:uu:diva-335470 (URN)10.1063/1.5002091 (DOI)000416825700056 ()
Projects
EIT KIC InnoEnergy IncoTrans
Funder
Swedish Energy Agency
Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2018-03-19Bibliographically approved
Barankova, H., Bardos, L. & Silins, K. (2016). Amorphous Carbon Films on Glass Prepared by Hollow Cathodes at Moderate Pressure. ECS Journal of Solid State Science and Technology, 5(9), N57-N60
Open this publication in new window or tab >>Amorphous Carbon Films on Glass Prepared by Hollow Cathodes at Moderate Pressure
2016 (English)In: ECS Journal of Solid State Science and Technology, ISSN 2162-8769, E-ISSN 2162-8777, Vol. 5, no 9, p. N57-N60Article in journal (Refereed) Published
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:uu:diva-310693 (URN)10.1149/2.0311609jss (DOI)000387983000006 ()
Projects
EIT KIC InnoEnergy IncoTrans
Funder
Swedish Energy Agency
Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2018-02-01
Barankova, H. & Bardos, L. (2016). Pulsed Atmospheric Pressure Plasma Reforming Of Ethanol. In: Cernak, M; Hoder, T (Ed.), Hakone XV: International Symposium On High Pressure Low Temperature Plasma Chemistry: With Joint Cost TD1208 Workshop: Non-Equilibrium Plasmas With Liquids For Water And Surface Treatment. Paper presented at 15th International Symposium on High Pressure Low Temperature Plasma Chemistry (HAKONE), SEP 11-16, 2016, Brno, CZECH REPUBLIC (pp. 380-381).
Open this publication in new window or tab >>Pulsed Atmospheric Pressure Plasma Reforming Of Ethanol
2016 (English)In: Hakone XV: International Symposium On High Pressure Low Temperature Plasma Chemistry: With Joint Cost TD1208 Workshop: Non-Equilibrium Plasmas With Liquids For Water And Surface Treatment / [ed] Cernak, M; Hoder, T, 2016, p. 380-381Conference paper, Published paper (Refereed)
Abstract [en]

The plasma source with a coaxial geometry was used for generation of plasma inside water and the ethanol-water mixtures. The hydrogen-rich synthesis gas with hydrogen content up to 60% was produced in submerged dc pulsed plasma. The effect of various plasma generation regimes on the performance of plasma, on the hydrogen production efficiency and on the reaction rise-time was examined. A role of the solution temperature, composition of the mixture and current delivered to the discharge are investigated.

Keywords
plasma discharge in liquids, hydrogen production, ethanol reforming
National Category
Physical Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-317107 (URN)000393033200091 ()9788021083189 (ISBN)
Conference
15th International Symposium on High Pressure Low Temperature Plasma Chemistry (HAKONE), SEP 11-16, 2016, Brno, CZECH REPUBLIC
Available from: 2017-03-10 Created: 2017-03-10 Last updated: 2017-03-14Bibliographically approved
Baránková, H. & Bàrdos, L. (2015). Atmospheric pressure plasma conversion of CO2 to solid deposits. Results in Physics, 5, 257-258
Open this publication in new window or tab >>Atmospheric pressure plasma conversion of CO2 to solid deposits
2015 (English)In: Results in Physics, ISSN 2211-3797, Vol. 5, p. 257-258Article in journal (Refereed) Published
Abstract [en]

Fused Hollow Cathode (FHC) with aerodynamic stabilization was used for the gas conversion processes. During the conversion of NO into NO2 in air mixtures, the CO2 reduction occurs, without forming gaseous CO. In these processes brownish glassy solid deposits are formed in the plasma region. The deposits were analyzed by scanning electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction.

Place, publisher, year, edition, pages
Elsevier: , 2015
Keywords
atmospheric pressure plasma conversion of CO2, Fused Hollow Cathode (FHC), Carbon suboxide deposit
National Category
Engineering and Technology Meteorology and Atmospheric Sciences
Identifiers
urn:nbn:se:uu:diva-268906 (URN)10.1016/j.rinp.2015.08.011 (DOI)000369890700052 ()
Available from: 2015-12-10 Created: 2015-12-10 Last updated: 2016-04-01Bibliographically approved
Baránková, H., Bardos, L. & Silins, K. (2015). DLC coatings prepared by hollow cathodes at moderate pressure. In: : . Paper presented at International Conference on Diamond and Carbon Materials, September 6-10, 2015, Bad Homburg, Germany..
Open this publication in new window or tab >>DLC coatings prepared by hollow cathodes at moderate pressure
2015 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

DLC coatings were prepared using the rf powered cylindrical and linear hollow cathodes. The deposition process is hybrid, combining both the PE CVD and PVD. A cylindrical graphite nozzle and graphite plates were used as targets. The gas mixture used in the deposition process was argon with acetylene.

 

Compared to e.g. magnetron sputtering, the optimum content of acetylene is lower. The effect of the acetylene content in the gas mixture as well as rf power on the deposition rate and properties of the coatings are evaluated.

 

The geometrical effect is studied, the cylindrical hollow cathode and the linear hollow cathode are compared and the transfer of the optimized process from the cylindrical into the linear hollow cathode is discussed.

Keywords
Hollow cathode, Hybrid PVD and PE CVD, Diamond-like carbon
National Category
Manufacturing, Surface and Joining Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials; Engineering Science
Identifiers
urn:nbn:se:uu:diva-283551 (URN)
Conference
International Conference on Diamond and Carbon Materials, September 6-10, 2015, Bad Homburg, Germany.
Available from: 2016-04-13 Created: 2016-04-13 Last updated: 2016-07-18Bibliographically approved
Barankova, H., Bardos, L. & Bardos, A. (2015). Magnetized hollow cathode activated magnetron. Applied Physics Letters, 107(15), Article ID 153501.
Open this publication in new window or tab >>Magnetized hollow cathode activated magnetron
2015 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 107, no 15, article id 153501Article in journal (Refereed) Published
Abstract [en]

Planar magnetron in which the target is coupled with a magnetized hollow cathode is presented. Detailed principles of such arrangements are explained. The hollow cathode activated magnetron produces intense and stable plasmas in a wider interval of the working gas pressures as compared to the conventional magnetrons at the same power. The developed arrangements enhance sputtering from the magnetron target by the high-density hollow cathode plasma and increase the number of sputtered/evaporated species. Results of the test experiments of these arrangements on a commercial planar magnetron with the Ti target are presented and their capabilities discussed.

National Category
Physical Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-267221 (URN)10.1063/1.4933091 (DOI)000363424000050 ()
Available from: 2015-11-19 Created: 2015-11-19 Last updated: 2017-12-01Bibliographically approved
Baránková, H. & Bárdos, L. (2013). Optimization and performance of atmospheric Fused Hollow Cathodes. Vacuum, 87, 128-131
Open this publication in new window or tab >>Optimization and performance of atmospheric Fused Hollow Cathodes
2013 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 87, p. 128-131Article in journal (Refereed) Published
Abstract [en]

Experimental results on the atmospheric hollow cathode plasma generation and performance, using a special configuration with tunable wall separations, are presented. The influence of the gas and type of the power used for generation on the optimum size of the cathode slit is investigated. The experimental results are in agreement with the hollow cathode model. The plasma source/plasma reactor design is of utmost importance for control of plasma-chemical kinetics. An example of the atmospheric hollow cathode plasma application for the NOx conversion is given. The energy consumption and plasma characteristics are discussed.

Keywords
Fused Hollow Cathode, Atmospheric hollow cathode plasma, Plasma conversion of gas, Non-equilibrium atmospheric plasma, Pulsed power
National Category
Physical Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-190260 (URN)10.1016/j.vacuum.2012.03.009 (DOI)000310549900025 ()
Available from: 2013-01-07 Created: 2013-01-07 Last updated: 2017-12-06Bibliographically approved
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