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Blar i NTNU Open på forfatter "Raaen, Steinar"

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Viser treff 21-34 av 34

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    • Metal Ions Supported Porous Coatings by Using AC Plasma Electrolytic Oxidation Processing 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Raaen, Steinar; Gaiaschi, Sofia; Chapon, Patrick; Matysek, Dalibor; Pietrzak, Kornel; Szymanska, Monika; Dudek, Łukasz (Peer reviewed; Journal article, 2020)
      Coatings enriched with zinc and copper as well as calcium or magnesium, fabricated on titanium substrate by Plasma Electrolytic Oxidation (PEO) under AC conditions (two cathodic voltages, i.e., −35 or −135 V, and anodic ...
    • Non-activated adsorption of methane on nickel surfaces induced by reduced work function 

      Raaen, Steinar; Hunvik, Kristoffer William Bø (Peer reviewed; Journal article, 2020)
      Adsorption of methane has been studied in ultrahigh vacuum environments on single crystalline as well as on Ni nano-particles on mica substrates. Experimental techniques have been X-ray and ultraviolet photoelectron ...
    • Novel Porous Phosphorus–Calcium–Magnesium Coatings on Titanium with Copper or Zinc Obtained by DC Plasma Electrolytic Oxidation: Fabrication and Characterization 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Gaiaschi, Sofia; Chapon, Patrick; Raaen, Steinar; Matysek, Dalibor; Dudek, Lukasz; Pietrzak, Kornel (Journal article; Peer reviewed, 2018)
      In this paper, the characteristics of new porous coatings fabricated at three voltages in electrolytes based on H3PO4 with calcium nitrate tetrahydrate, magnesium nitrate hexahydrate, and copper(II) nitrate trihydrate are ...
    • Parallel Integration of Aligned Carbon Strings in Polymer Matrix: Dielectrophoretic Preparation, Electrical and Electromechanical Characterisation 

      Sandsaunet, Marit Ulset (Master thesis, 2012)
      Carbon black particles have been aligned into string-like assemblies by dielectrophoresis. Particles were dispersed in Dymax Ultra Light-Weld 3094 oligomermixture, with 0.1 vol.% filler content. This mixture was spread ...
    • Partial Discharges on an Epoxy Surface due to Water Droplets 

      Grieg, Bernt Milne (Master thesis, 2011)
      Offshore wind turbines are exposed to a very harsh environment and can sustain significant damage during operation. In this thesis work, the possibilities of partial discharges in an insulation system of an offshore wind ...
    • Phosphate Coatings Enriched with Copper on Titanium Substrate Fabricated Via DC-PEO Process 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Kacalak, Wojciech; Tandecka, Katarzyna; Raaen, Steinar; Gaiaschi, Sofia; Chapon, Patrick; Malorny, Winfried; Matysek, Dalibor; Pietrzak, Kornel; Dudek, Lukasz (Peer reviewed; Journal article, 2020)
      The present paper covers the possible ways to fabricate advanced porous coatings that are enriched in copper on a titanium substrate through Direct Current Plasma Electrolytic Oxidation (DC-PEO) with voltage control, in ...
    • Physicochemical mechanisms for gas adsorption on clay mineral interfaces and surfaces 

      Hunvik, Kristoffer William Bø (Doctoral theses at NTNU;2020:316, Doctoral thesis, 2020)
      Increasing anthropogenic carbon emissions have a detrimental impact on our planet's ecosystems. If we want to keep our planet habitable for future generations, serious action is needed. We need to both reduce and mitigate ...
    • Porous Coatings Containing Copper and Phosphorus Obtained by Plasma Electrolytic Oxidation of Titanium 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Kacalak, Wojciech; Tandecka, Katarzyna; Raaen, Steinar; Gaiaschi, Sofia; Chapon, Patrick; malorny, winfried; Matysek, Dalibor; Pietrzak, Kornel; Czerwinska, Ewa; Iwanek, Anna; Dudek, Lukasz (Journal article; Peer reviewed, 2020)
      To fabricate porous copper coatings on titanium, we used the process of plasma electrolyticoxidation (PEO) with voltage control. For all experiments, the three-phase step-up transformer withsix-diode Graetz bridge was used. ...
    • Potential Oxide-Based Intermediate Band Materials: Fabrication and Photoemission Studies 

      Jorge, Marina Rodrigues (Doctoral theses at NTNU;2020:83, Doctoral thesis, 2020)
      Intermediate band solar cells (IBSCs) is a so-called third generation solar cell concept, and are based on a new type of semiconductor materials which have an intermediate band (IB) within the bandgap. This IB works as a ...
    • SEM, EDS and XPS Analysis of the Coatings Obtained on Titanium after Plasma Electrolytic Oxidation in Electrolytes Containing Copper Nitrate 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Matysek, Dalibor; Raaen, Steinar; Valicek, Jan; Dudek, Lukasz; Harnicarova, Marta (Journal article; Peer reviewed, 2016)
      In the paper, the Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Photoelectron Spectroscopy (XPS) results of the surface layer formed on pure titanium after plasma electrolytic ...
    • SEM, EDS and XPS studies of AC & DC PEO coatings obtained on titanium substrate 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Dudek, Lukasz; Pietrzak, Kornel; Raaen, Steinar; Malorny, Winfried; Ciuperca, Radion (Journal article; Peer reviewed, 2019)
      The porous coatings may be fabricated on titanium substrate by Plasma Electrolytic Oxidation (PEO), known also as Micro Arc Oxidation (MAO), under AC or DC regimes. The obtained surfaces were characterized by Scanning ...
    • SEM, EDS, and XPS characterization of coatings obtained on titanium during AC plasma electrolytic process enriched in magnesium 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Raaen, Steinar; Matysek, Dalibor; Dudek, Lukasz; Pietrzak, Kornel (Journal article; Peer reviewed, 2018)
      Plasma Electrolytic Oxidation (PEO) known also as Micro Arc Oxidation (MAO) process is widely used to fabricate porous coatings on titanium and its alloys mainly in water- and acid-based solutions to different applications, ...
    • SEM/EDX, XPS, corrosion and surface roughness characterization of AISI 316L SS after electrochemical treatment in concentrated HNO3 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Raaen, Steinar; Valicek, Jan (Journal article; Peer reviewed, 2015)
      In the paper there is described the AISI 316L stainless steel surface obtained after electrochemical treatment in concentrated HNO3. It was characterized by roughness parameters, corrosion protection behaviour and chemical ...
    • XPS and GDOES characterization of porous coating enriched with copper and calcium obtained on tantalum via plasma electrolytic oxidation 

      Rokosz, Krzysztof; Hryniewicz, Tadeusz; Chapon, Patrick; Raaen, Steinar; Sandim, Hugo Ricardo Zschommler (Peer reviewed; Journal article, 2016)
      XPS and GDOES characterizations of porous coatings on tantalum after Plasma Electrolytic Oxidation (PEO) at 450 V for 3 minutes in electrolyte containing concentrated (85%) phosphoric acid with calcium nitrate and copper ...

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