Browsing SINTEF Open by Author "Diplas, Spyridon"

Now showing items 1-20 of 20

    • Accelerated material development for laser powder-bed fusion using the arc melting process 

      Reiersen, Magnus; Gunnæs, Anette Eleonora; S. Azar, Amin; Diplas, Spyridon; Du, Qiang; M'Hamdi, Mohammed (Peer reviewed; Journal article, 2023)
      Metal additive manufacturing has in recent years gained an increasing amount of attention, especially the subgroup of laser powder-bed fusion and aluminium alloys. However, established alloys are designed for casting and ...

    • A Comparative Investigation of Duplex and Super Duplex Stainless Steels Processed through Laser Powder Bed Fusion 

      Gargalis, Leonidas; Karavias, Leonidas; Graff, Joachim Seland; Diplas, Spyridon; Koumoulos, Elias P.; Karaxi, Evangelia K. (Peer reviewed; Journal article, 2023)
      The aim of this paper was to compare duplex (DSS) and super duplex stainless steel processed by laser powder bed fusion (LPBF) based on the process parameters and microstructure–nanomechanical property relationships. Each ...

    • Controlling the Electrical Properties of Reactively Sputtered High Entropy Alloy CrFeNiCoCu Films 

      Mayandi, Jeyanthinath; Finstad, Terje Gunnar; Stange, Marit Synnøve Sæverud; Vasquez, Geraldo Cristian; Sunding, Martin Fleissner; Løvvik, Ole Martin; Diplas, Spyridon; Almeida Carvalho, Patricia (Peer reviewed; Journal article, 2021)
      Oxide-containing films were made by reactively sputtering a high-entropy alloy target of CrFeCoNiCu. We report on a wide range of changes to the electrical properties made by different heat treatments in oxidizing and ...

    • Correlation between surface chemistry and morphology of PtCu and Pt nanoparticles during oxidation-reduction cycle 

      Kalyva, Maria Evangelou; Sunding, Martin Fleissner; Gunnæs, Anette Eleonora; Diplas, Spyridon; Redekop, Evgeniy (Peer reviewed; Journal article, 2020)
      Process conditions during catalytic reactions induce significant changes in surface chemistry and structure of bi- (mono) metallic nanoparticles leading to their deactivation, and this can ultimately affect the reactions ...

    • Cubic silicon carbide as a potential photovoltaic material 

      Syväjärvi, Mikael; Ma, Quanbao; Jokubavicius, Valdas; Galeckas, Augustinas; Sun, Jianwu; Liu, Xinyu; Jansson, Mattias; Wellmann, Peter; Linnarsson, Margareta; Runde, Paal; Johansen, Bertil; Thøgersen, Annett; Diplas, Spyridon; Carvalho, Patricia; Løvvik, Ole Martin; Wright, Daniel Nilsen; Azarov, Alexander; Svensson, Bengt Gunnar (Peer reviewed; Journal article, 2016)
      In this work we present a significant advancement in cubic silicon carbide (3C-SiC) growth in terms of crystal quality and domain size, and indicate its potential use in photovoltaics. To date, the use of 3C-SiC for ...

    • Effect of graphene coatings on the morphology of submillimeter thin copper wires after salt spray aging 

      Lis, Krzysztof; Placek, Krzysztof; Diplas, Spyridon; Sunding, Martin Fleissner; Gorantla, Sandeep M.; Gryglewicz, Grażyna; Bachmatiuk, Alicja (Peer reviewed; Journal article, 2023)
      Unprotected copper conductors are prone to oxidation and corrosion, especially when in contact with salt water or at high temperature. In this study, we compared commercially available coating with graphene oxide and ...

    • Galvanic Deposition of Pt Nanoparticles on Black TiO2 Nanotubes for Hydrogen Evolving Cathodes 

      Touni, Aikaterini; Liu, Xin; Kang, Xiaolan; Almeida Carvalho, Patricia; Diplas, Spyridon; Both, Kevin Gregor; Sotiropoulos, Sotiris; Chatzitakis, Athanasios (Peer reviewed; Journal article, 2021)
      A galvanic deposition method for the in-situ formation of Pt nanoparticles (NPs) on top and inner surfaces of high-aspect-ratio black TiO2-nanotube electrodes (bTNTs) for true utilization of their total surface area has ...

    • Heat source management in wire-arc additive manufacturing process for Al-Mg and Al-Si alloys 

      Oyama, Kohei; Diplas, Spyridon; M'hamdi, Mohammed; Gunnæs, Anette Eleonora; S. Azar, Amin (Journal article; Peer reviewed, 2019)
      Modelling of wire-arc additive manufacturing process is an effective way for adapting the optimum parameters as well as understanding and managing the sequences of layer-by-layer deposition. Some of these parameters such ...

    • High entropy alloy CrFeNiCoCu sputter deposited films: Structure, electrical properties, and oxidation 

      Mayandi, Jeyanthinath; Schrade, Matthias; Vajeeston, Ponniah; Stange, Marit Synnøve Sæverud; Lind, Anna Maria; Sunding, Martin Fleissner; Deuermeier, Jonas; Fortunato, Elvira; Løvvik, Ole Martin; Ulyashin, Alexander; Diplas, Spyridon; Almeida Carvalho, Patricia; Finstad, Terje Gunnar (Peer reviewed; Journal article, 2022)
      High entropy alloy (HEA) films of CrFeCoNiCu were deposited by sputtering. Their structure was characterized and their electric transport properties were studied by temperature-dependent Hall and Seebeck measurements. The ...

    • Interface phenomena in magnetron sputtered Cu2O/ZnO heterostructures 

      Jensen, Ingvild Julie Thue; Gorantla, Sandeep Madhukar; Løvvik, Ole Martin; Gan, Jiantuo; Nguyen, Phuong Dan; Monakhov, Edouard; Svensson, Bengt Gunnar; Gunnæs, Anette Eleonora; Diplas, Spyridon (Peer reviewed; Journal article, 2017)
      The interface between ZnO and Cu2O has been predicted to be a good candidate for use in thin film solar cells. However, the high predicted conversion efficiency has yet to be fully realized experimentally. To explore the ...

    • Materials characterisation and software tools as key enablers in Industry 5.0 and wider acceptance of new methods and products 

      Konstantopoulos, Georgios; Charitidis, Costas A.; Bañares, Miguel A.; Portela, Raquel; Zangenberg, Nikolaj; Capria, Ennio; Sebastiani, Marco; Goldbeck, Gerhard; Koumoulos, Elias; Boskovic, Bojan; Diplas, Spyridon; Konchakova, Natalia; Todorov, Ilian; Dykeman, Donna; Avataneo, Silvia Giovanna; Falzetti, Marco; Diz, Enrique Lozano; Reinosa, Julian J.; Burov, Ekaterina; Škrelić, Dejan; Jeliazkova, Nina; Barton, Bastian; Masotti, Giovanni; Tamarozzi, Tommaso; Alcón, Iván Moya (Peer reviewed; Journal article, 2023)
      Recently, the NMBP-35 Horizon 2020 projects - NanoMECommons, CHARISMA, and Easi-stress - organised a collaborative workshop to increase awareness of their contributions to the industry "commons" in terms of characterisation ...

    • Nanoscale silicate melt textures determine volcanic ash surface chemistry 

      Hornby, Adrian J.; Ayris, Paul M.; Damby, David E.; Diplas, Spyridon; Eychenne, Julia; Kendrick, Jackie E.; Cimarelli, Corrado; Kueppers, Ulrich; Scheu, Bettina; Utley, James E. P.; Dingwell, Donald B. (Peer reviewed; Journal article, 2024)
      Explosive volcanic eruptions produce vast quantities of silicate ash, whose surfaces are subsequently altered during atmospheric transit. These altered surfaces mediate environmental interactions, including atmospheric ice ...

    • Novel Powder Feedstock towards Microstructure Engineering in Laser Powder Bed Fusion: A Case Study on Duplex/Super Duplex and Austenitic Stainless-Steel Alloys 

      Gargalis, Leonidas; Karavias, Leonidas; Graff, Joachim Seland; Diplas, Spyridon; Koumoulos, Elias P.; Karaxi, Evangelia K. (Peer reviewed; Journal article, 2023)
      Additive manufacturing of Duplex Stainless Steels (DSS) and Super Duplex Stainless Steels (SDSS) has been successfully demonstrated using LPBF in recent years, however, both alloys feature an almost fully ferritic ...

    • Probing the structural evolution and its impact on magnetic properties of FeCoNi(AlMn)x high-entropy alloy at the nanoscale 

      Bazioti, Kalliopi; Løvvik, Ole Martin; Poulia, Anthoula; Almeida Carvalho, Patricia; S. Azar, Amin; Mikheenko, Pavlo; Diplas, Spyridon; Gunnæs, Anette Eleonora (Peer reviewed; Journal article, 2022)
      We report the first nanoscale investigation of FeCoNi(AlMn)x high-entropy alloys (HEAs) processed by laser metal deposition. The structural evolution of the alloy upon chemical composition variation (0.2 ≤ x ≤ 1.5) was ...

    • Process–Structure–Property Relationship in FeCoNiAlxMnx Complex Concentrated Alloys Processed by Additive Manufacturing 

      Poulia, Anthoula; S. Azar, Amin; Schrade, M.; Graff, J.S.; Bazioti, Kalliopi; Gunnæs, Anette Eleonora; Carvalho, P.A.; Diplas, Spyridon (Peer reviewed; Journal article, 2021)
      Fourteen alloys of the FeCoNiAlxMnx system were processed by laser metal deposition (LMD). The feedstock was a weighted and proportional blend of the containing elemental powders, targeting the nominal alloy compositions. ...

    • Reference data set of volcanic ash physicochemical and optical properties 

      Vogel, Andreas; Diplas, Spyridon; Durant, Adam; Azar, Amin Shahrestani; Sunding, Martin Fleissner; Rose, William I.; Sytchkova, Anna Krasilnikova; Bonadonna, Costanza; Krüger, Kirstin; Stohl, Andreas (Peer reviewed; Journal article, 2017)
      Uncertainty in the physicochemical and optical properties of volcanic ash particles creates errors in the detection and modeling of volcanic ash clouds and in quantification of their potential impacts. In this study, we ...

    • Roadmap for additive manufacturing of HAYNES® 282® superalloy by laser beam powder bed fusion (PBF-LB) technology 

      Otto, Robert; Brøtan, Vegard; Carvalho, Patricia A.; Reiersen, Magnus; Graff, Joachim Seland; Sunding, Martin Fleissner; Åsebø Berg, Olav; Diplas, Spyridon; Azar, Amin Shahrestani (Peer reviewed; Journal article, 2021)
      Although various alloy systems have been explored for additive manufacturing (AM) during the past decade, introducing a new alloy remains a challenging task. Most of the materials require iterative builds, for investigating ...

    • Thin films made by reactive sputtering of high entropy alloy FeCoNiCuGe: Optical, electrical and structural properties 

      Mayandi, Jeyanthinath; Finstad, Terje Gunnar; Dahl, Øystein; Ponniah, Vajeeston; Schrade, Matthias; Løvvik, Ole Martin; Diplas, Spyridon; Almeida Carvalho, Patricia (Peer reviewed; Journal article, 2022)
      Films were reactively sputtered from a high entropy alloy (HEA) FeCoNiCuGe target in an Ar/O2 plasma. The case of zero O2 gas flow yielded HEA films of FeCoNiCuGe. These as-deposited HEA films have a face centered cubic ...

    • Valence charge distribution in homogenous silicon-aluminium thin-films 

      Thøgersen, Annett; Jensen, Ingvild Julie Thue; Stange, Marit Synnøve Sæverud; Røyset, Arne Karstein; Løvvik, Ole Martin; Ulyashin, Alexander; Diplas, Spyridon (Peer reviewed; Journal article, 2018)
      Homogenous aSi1−xAlxHy alloyed thin films, made by magnetron sputtering, has been found to exhibit tunable band gap and dielectric constant depending on their composition. The optical properties of alloys are largely defined ...

    • Zn Redistribution and Volatility in ZnZrOx Catalysts for CO2 Hydrogenation 

      Redekop, Evgeniy; Cordero-Lanzac, Tomás; Salusso, Davide; Pokle, Anuj; Øien-Ødegaard, Sigurd; Sunding, Martin Fleissner; Diplas, Spyridon; Negri, Chiara; Borfecchia, Elisa; Bordiga, Silvia; Olsbye, Unni (Peer reviewed; Journal article, 2023)
      ZnO–ZrO2 mixed oxide (ZnZrOx) catalysts are widely studied as selective catalysts for CO2 hydrogenation into methanol at high-temperature conditions (300–350 °C) that are preferred for the subsequent in situ zeolite-catalyzed ...