Browsing by Subject "X ray photoelectron spectroscopy"

Now showing items 21-32 of 32

    • Article  

      Nanostructure, mechanical and tribological properties of reactive magnetron sputtered TiCx coatings 

      Polychronopoulou, K.; Rebholz, Claus; Baker, M. A.; Theodorou, L.; Demas, N. G.; Hinder, S. J.; Polycarpou, A. A.; Doumanidis, C. C.; Böbel, K. (2008)
      This study describes the correlation between microstructure, mechanical and tribological properties of TiCx coatings (with x being in the range of 0-1.4), deposited by reactive magnetron sputtering from a Ti target in ...
    • Article  

      The nanostructure, wear and corrosion performance of arc-evaporated CrBxNy nanocomposite coatings 

      Polychronopoulou, K.; Baker, M. A.; Rebholz, Claus; Neidhardt, J.; O'Sullivan, M.; Reiter, A. E.; Kanakis, K.; Leyland, A.; Matthews, A.; Mitterer, C. (2009)
      The composition, nanostructure, tribological and corrosion behaviour of reactive arc evaporated CrBxNy coatings have been studied and compared to CrN. The CrBxNy coatings were deposited on a commercial Oerlikon Balzers RCS ...
    • Article  

      Organized silica films generated by evaporation-induced self-assembly as hosts for iron oxide nanoparticles 

      Andreou, Ioanna; Amenitsch, H.; Likodimos, Vlassis; Falaras, Polycarpos; Koutsoukos, Petros George; Leontidis, Epameinondas (2013)
      In this work, we prepared oriented mesoporous thin films of silica on various solid substrates using the pluronic block copolymer P123 as a template. We attempted to insert guest iron oxide (FexOy) nanoparticles into these ...
    • Article  

      Oxy-chlorination as an effective treatment of aged Pd/CeO 2-Al 2O 3 catalysts for Pd redispersion 

      Lambrou, Panayiota S.; Polychronopoulou, Kyriaki; Petallidou, Klito C.; Efstathiou, Angelos M. (2012)
      The present work reports on the effects of oxy-chlorine gas treatment (use of Cl 2/O 2/He gas mixture) applied on a 5wt% Pd/20wt% CeO 2-Al 2O 3 catalyst towards Pd redispersion. X-ray diffraction (XRD), X-ray photoelectron ...
    • Article  

      Reactivation of an aged commercial three-way catalyst by oxalic and citric acid washing 

      Christou, Stavroula Y.; Birgersson, H.; Fierro, José Luis García; Efstathiou, Angelos M. (2006)
      The efficiency of dilute oxalic and citric acid solutions on improving the oxygen storage capacity (OSC) and catalytic activity of a severely aged (83 000 km) commercial three-way catalyst (TWC) has been investigated. ...
    • Article  

      Role of P-containing species in phosphated CeO2 in the deterioration of its oxygen storage and release properties 

      López Granados, M.; Galisteo, F. C.; Lambrou, Panayiota S.; Mariscal, R.; Sanz, J.; Sobrados, I.; Fierro, José Luis García; Efstathiou, Angelos M. (2006)
      The chemical nature of P-containing species incorporated on the surface and within the subsurface regions of CeO2 solid and their effects on the deterioration of the oxygen storage and release properties of phosphated ceria ...
    • Article  

      Structure, mechanical and tribological properties of sputtered TiAlBN thin films 

      Rebholz, Claus; Schneider, J. M.; Voevodin, A. A.; Steinebrunner, J.; Charitidis, C.; Logothetidis, S.; Leyland, A.; Matthews, A. (1999)
      TiAlBN films were produced by simultaneously sputtering from TiAl and TiB2 targets in Ar/N2 mixtures at a substrate temperature of 150 °C. The goal of this investigation was to study the influence of the nitrogen content ...
    • Article  

      Surface reactivity of LaCoO3 and Ru/LaCoO3 towards CO, CO2 and C3H8: Effect of H2 and O2 pretreatments 

      Álvarez-Galván, M. C.; Constantinou, D. A.; Navarro, R. M.; Villoria, J. A.; Fierro, José Luis García; Efstathiou, Angelos M. (2011)
      The differences in surface reactivity of LaCoO3 and Ru/LaCoO3 solids after pre-treatment in a hydrogen or oxygen gas atmosphere towards oxidative steam reforming (OSR) of propane was probed by performing temperature-programmed ...
    • Article  

      Synthesis and characterization of Cr-B-N coatings deposited by reactive arc evaporation 

      Polychronopoulou, K.; Neidhardt, J.; Rebholz, Claus; Baker, M. A.; O'Sullivan, M.; Reiter, A. E.; Gunnaes, A. E.; Giannakopoulos, K.; Mitterer, C. (2008)
      Nanocomposite Cr-B-N coatings were deposited from CrB0.2 compound targets by reactive arc evaporation using an Ar/N2 discharge at 500 °C and -20 V substrate bias. Elastic recoil detection (ERDA), x-ray photoelectron ...
    • Article  

      Tailoring MgO-based supported Rh catalysts for purification of gas streams from phenol 

      Polychronopoulou, Kyriaki; Giannakopoulos, K.; Efstathiou, Angelos M. (2012)
      The present work is focused on the sol-gel synthesis, characterization and catalytic performance evaluation of novel Mg-Ce-Zr-O-based mixed oxides supported Rh catalysts for the purification of H 2-rich gas streams from ...
    • Conference Object  

      Tribological behavior of CrN and Al-Cr-N coatings 

      Demas, N. G.; Polycarpou, A. A.; Polychronopoulou, K.; Rebholz, Claus (Affiliation: Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United StatesAffiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 1678, Nicosia, CyprusCorrespondence Address: Demas, N. G.Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States, 2009)
      The tribological behavior of CrN and Al-Cr-N coatings prepared by twin electron-beam evaporation at 450°C was investigated. The composition, structure, mechanical and tribological properties of the coatings were determined ...
    • Article  

      Tribological properties of twin electron-beam evaporated Cr-N and Al-Cr-N coatings under laboratory sliding and drill experiments 

      Polychronopoulou, K.; Demas, N. G.; Rebholz, Claus; Polycarpou, A. A. (2008)
      The tribological behavior of substoichiometric Cr-N and Al-Cr-N coatings prepared by twin electron-beam evaporation at 450°C was studied. Al-Cr-N coatings with Al to Cr ratios in the range of 1-8 (and nitrogen concentrations ...