Browsing NTNU Open by Author "Raaen, Steinar"
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Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100)
Raaen, Steinar (Peer reviewed; Journal article, 2021)Studies of adsorption of CO2 on nanoscopic surfaces are relevant for technological applications in heterogeneous catalysis as well as for sorption of this important greenhouse gas. Presently, adsorption of carbon dioxide ... -
Adsorption of CO on nickel-decorated muscovite mica
Støvneng, Anna Tiseth (Master thesis, 2018)Adsorption of carbon monoxide on nickel-decorated muscovite mica is studied using the surface analysis techniques X-ray photoelectron spectrocsopy, temperature programmed desorption, and atomic force microscopy. Muscovite ... -
Antimicrobial Properties of Samarium Doped Hydroxyapatite Suspensions and Coatings
Iconaru, Simona Liliana; Groza, A; Gaiaschi, Sofia; Rokosz, Krzysztof; Raaen, Steinar; Ciobanu, Steluta Carmen; Chapon, Patrick; Predoi, Daniela (Peer reviewed; Journal article, 2020)Post-implant infections are a major health problem, and it is well-known that treating them with conventional drugs is accompanied by many disadvantages. The development of new biomaterials with enhanced antimicrobial ... -
Biocomposite Coatings Doped with Magnesium and Zinc Ions in Chitosan Matrix for Antimicrobial Applications
Predoi, Daniela; Ciobanu, Carmen Steluta; Iconaru, Simona Liliana; Raaen, Steinar; Rokosz, Krzysztof (Peer reviewed; Journal article, 2023)Hydroxyapatite doped with magnesium and zinc in chitosan matrix biocomposites have great potential for applications in space technology, aerospace, as well as in the biomedical field, as a result of coatings with multifunctional ... -
Biological and Physico-Chemical Properties of Composite Layers Based on Magnesium-Doped Hydroxyapatite in Chitosan Matrix
Iconaru, Simona Liliana; Ciobanu, Carmen Steluta; Predoi, Gabriel; Rokosz, Krzysztof; Chifiriuc, Mariana Carmen; Bleotu, Coralia; Stanciu, George; Hristu, Radu; Raaen, Steinar; Raita, Stefania; Ghegoiu, Liliana; Badea, Monica Luminita; Predoi, Daniela (Peer reviewed; Journal article, 2022)In the present study, we report the development and characterization of composite layers (by spin coating) based on magnesium-doped hydroxyapatite in a chitosan matrix, (Ca10−xMgx(PO4)6(OH)2; xMg = 0, 0.08 and 0.3; HApCh, ... -
Characterisation of Calcium- and Phosphorus-Enriched Porous Coatings on CP Titanium Grade 2 Fabricated by Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Pietrzak, Kornel; Malorny, Winfried (Journal article; Peer reviewed, 2017)In the paper, Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), and Glow Discharge Optical Emission Spectroscopy (GDOES) analyses of calcium- and ... -
Characterisation of porous coatings formed on titanium under AC plasma electrolytic oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Dudek, Lukasz; Pietrzak, Kornel; malorny, winfried; Ciuperca, Radion (Journal article; Peer reviewed, 2018)The Plasma Electrolytic Oxidation (PEO) process may be used to fabricate porous coatings on titanium. The ranges of voltages used in case of these plasma treatments are different. It has been found that for DC PEO processing ... -
Characterisation of porous coatings formed on titanium under DC plasma electrolytic oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Dudek, Lukasz; Pietrzak, Kornel; malorny, winfried; Ciuperca, Radion (Journal article; Peer reviewed, 2018)Porous coatings on titanium may be obtained by AC or DC Plasma Electrolytic Oxidation (PEO) process. One has to point out that depending on the plasma treatment the ranges of voltages used are different. It has been found ... -
Characterization of Porous Phosphate Coatings Enriched with Calcium, Magnesium, Zinc and Copper Created on CP Titanium Grade 2 by Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Kacalak, Wojciech; Tandecka, Katarzyna; Raaen, Steinar; Gaiaschi, Sofia; Chapon, Patrick; malorny, winfried; Matysek, Dalibor; Dudek, Lukasz; Pietrzak, Kornel (Journal article; Peer reviewed, 2018)In the paper, the effect of voltage increase (from 500 VDC up to 650 VDC) on the structure and chemical composition of the porous coating on titanium made by Plasma Electrolytic Oxidation is presented. Phosphates-based ... -
Characterization of Porous Phosphate Coatings Enriched with Magnesium or Zinc on CP Titanium Grade 2 under DC Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Pietrzak, Kornel; malorny, winfried; Fernandes, Joao Salvador (Journal article; Peer reviewed, 2018)The aim of the paper is to study and determine the effect of voltage increasing from 500 up to 650 VDC on chemical and electrochemical properties of the obtained porous coatings with plasma electrolytic oxidation (PEO) ... -
CO desorption from nickel-decorated muscovite mica
Hunvik, Kristoffer William Bø; Støvneng, Anna; Pacáková, Barbara; Raaen, Steinar (Journal article; Peer reviewed, 2019)Adsorption and desorption of CO from Ni nanostructures deposited on muscovite mica substrates have been studied by TPD and characterized by XPS and AFM. In agreement with previous reports it is found that CO does not adsorb ... -
CO2 adsorption on pure and oxidised Ni nano-structures deposited on mica surfaces
Hunvik, Kristoffer William Bø; Pacáková, Barbara; Raaen, Steinar (Peer reviewed; Journal article, 2020)Adsorption and desorption of CO2 on metallic and oxidised Ni nano-structures supported on mica (muscovite) substrates have been studied by temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and ... -
Cr/Fe ratio by XPS spectra of magnetoelectropolished AISI 316L SS fitted by Gaussian-Lorentzian shape lines
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Raaen, Steinar (Journal article; Peer reviewed, 2014)In the paper, the analyses of Fe2p3/2 and chromium Cr2p3/2 XPS spectra with fitting by symmetrical and asymmetrical line shapes, are presented. The calculations are performed on AISI 316L SS biomaterial after magnetoelec ... -
Development of Cerium‐Doped Hydroxyapatite Coatings with Antimicrobial Properties for Biomedical Applications
Predoi, Daniela; Iconaru, Simona Liliana; Predoi, Mihai Valentin; Groza, Andreea; Gaiaschi, Sofia; Rokosz, Krzysztof; Raaen, Steinar; Negrila, Catalin Constantin; Prodan, Alina-Mihaela; Costescu, Adrian; Badea, Monica Luminita; Chapon, Patrick (Peer reviewed; Journal article, 2020)Antibacterial cerium-doped hydroxyapatite (Ce-HAp) layers have been researched sparingly in recent years. The Ce-HAp powder, Ca10−xCex(PO4)6(OH)2 with xCe = 0.05, was obtained by an adapted chemical co-precipitation method ... -
Development of Porous Coatings Enriched with Magnesium and Zinc Obtained by DC Plasma Electrolytic Oxidation
Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; malorny, winfried; Matysek, Dalibor; Pietrzak, Kornel (Journal article; Peer reviewed, 2018)Coatings with developed surface stereometry, being based on a porous system, may be obtained by plasma electrolytic oxidation, PEO (micro arc oxidation, MAO). In this paper, we present novel porous coatings, which may be ... -
Effect of nitrogen pressure and substrate bias voltage on the properties of Al–Cr–B–N coatings deposited using cathodic arc evaporation
Warcholinski, B; Gilewicz, A; Myslinski, P; Dobruchowska, E; Murzynski, D; Kochmanski, P; Rokosz, Krzysztof; Raaen, Steinar (Peer reviewed; Journal article, 2021)Cathodic arc evaporation deposition method was applied to forming Al–Cr–B–N coatings. The effect of nitrogen pressure (pN2) and substrate bias voltage (UB) on the properties of the coatings synthesized using Al50Cr30Br20 ... -
Effects of Oxygen Mobility in La-Fe-Based Perovskites on the Catalytic Activity and Selectivity of Methane Oxidation
Chang, Hui; Bjørgum, Erlend; Mihai, Oana; Yang, Jie; Lein, Hilde Lea; Grande, Tor; Raaen, Steinar; Zhu, Yi-an; Holmen, Anders; Chen, De (Peer reviewed; Journal article, 2020)The mechanism and structure requirements of selective and total oxidation of methane in a chemical looping process are both experimentally and theoretically examined on La1–xSrxFeO3−δ (x = 0, 0.2, and 0.5) and La0.5Sr0.5 ... -
Electrochemical modification of the Ti-15Mo alloy surface in solutions containing ZnO and Zn3(PO4)2 particles
Lesniak-Ziolkowska, Katarzyna; Kazek-Kesik, Alicja; Rokosz, Krzysztof; Raaen, Steinar; Stolarczyk, Agnieszka; Krok-Borkowicz, Malgorzata; Pamula, Elzbieta; Golda-Cepa, Monika; Brzychczy-Wloch, Monika; Simka, Wojciech (Peer reviewed; Journal article, 2020)This paper reports on the plasma electrolytic oxidation (PEO) of titanium alloy Ti-15Mo in baths containing zinc to obtain biomaterials with bacteriostatic and antibacterial properties. The Ti-15Mo surface was oxidised in ... -
Emisjon av ultrafiolett lys fra positive streamere i sykloheksan
Samseth, Jarl Øystein (Master thesis, 2016)Isolerende væsker for elektriske komponenter, går til gjennomslag ved høyt elektrisk felt grunnet et fenomen kalt streamere. Streamere er elektrisk ledende kanaler av gass eller plasma som propagerer raskere desto høyere den ... -
Experimental Studies of Catalytic Properties of Gold Nanostructures on Ruthenium Substrate
Dobrovolskaia, Polina (Master thesis, 2013)This study presents and investigates gold nanostructures on a ruthenium substrate by experimental techniques, such as X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED) and temperature-programmed ...