• Article  

      Adaptive VN/Ag nanocomposite coatings with lubricious behavior from 25 to 1000 °c 

      Aouadi, S. M.; Singh, D. P.; Stone, D. S.; Polychronopoulou, K.; Nahif, F.; Rebholz, Claus; Muratore, C.; Voevodin, A. A. (2010)
      A two-phase nanocomposite coating that consists of inclusions of silver in a vanadium nitride matrix (VN/Ag) was investigated as a potential adaptive coating with a reduced friction coefficient from 25 to 1000 °C. This ...
    • Article  

      Composite DLC-metal/metal-carbide coatings produced by electron enhanced unbalanced magnetron sputtering 

      Rebholz, Claus; Ziegele, H.; Voevodin, A. A.; Schneider, J. M.; Matthews, A. (1997)
      Composite coatings consisting of metal containing diamond like carbons were produced by unbalanced magnetron sputtering in a closed field magnetic configuration. Targets of Pta and W were poisoned with acetylene during the ...
    • Article  

      Coupling of helix E-F motion with the O-nitrito and 2-nitrovinyl coordination in myoglobin 

      Ioannou, Androulla; Lambrou, Alexandra; Daskalakis, Vangelis; Pinakoulaki, Eftychia (2017)
      Myoglobin (Mb) is known to react slowly with nitirite to form the green pigment by NO2 − cordination to the heme Fe in the O-binding nitrito (O1[sbnd]N[dbnd]O2) mode and to the heme 2-vinyl position. Nitrite is a powerful ...
    • Article  

      Detection of the His-heme Fe2+-NO species in the reduction of NO to N2O by ba3-oxidase from thermus thermophilus 

      Pinakoulaki, Eftychia; Ohta, T.; Soulimane, T.; Kitagawa, T.; Varotsis, Constantinos (2005)
      Reaction pathways in the enzymatic formation and cleavage of the N-N and N-O bonds, respectively, are difficult to verify without the structure of the intermediates, but we now have such information on the heme a3 2+-NO ...
    • Article  

      Direct observation of ultrafast long-range charge separation at polymer-fullerene heterojunctions 

      Provencher, F.; Bérubé, N.; Parker, A. W.; Greetham, G. M.; Towrie, M.; Hellmann, C.; Côté, M.; Stingelin, N.; Silva, C.; Hayes, Sophia C. (2014)
      In polymeric semiconductors, charge carriers are polarons, which means that the excess charge deforms the molecular structure of the polymer chain that hosts it. This results in distinctive signatures in the vibrational ...
    • Conference Object  

      Effect of molecular weight on the vibronic structure of a diketopyrrolopyrrole polymer 

      Hayes, Sophia C.; Pieridou, Galatia K.; Vezie, M.; Few, S.; Bronstein, H.; Meager, I.; McCulloch, I.; Nelson, J. (SPIE, 2016)
      Resonance Raman Spectroscopy (RRS) is employed in this study to examine the influence of molecular weight on the optical response of a diketopyrrolopyrrole polymer (DPP-TT-T) in solution. The vibronic structure observed ...
    • Article  

      Layered atomic structures of double oxides for low shear strength at high temperatures 

      Stone, D.; Liu, J.; Singh, D. P.; Muratore, C.; Voevodin, A. A.; Mishra, S.; Rebholz, Claus; Ge, Q.; Aouadi, S. M. (2010)
      Double oxide phases combining a transition metal and a noble metal have recently become a subject of investigation as solid lubricant materials for high-temperature tribological applications. Here, we study the changes in ...
    • Article  

      Local structure and influence of bonding on the phase-change behavior of the chalcogenide compounds K1-xRbxSb5S8 

      Wachter, J. B.; Chrissafis, K.; Petkov, V.; Malliakas, C. D.; Bilc, D. I.; Kyratsi, Theodora; Paraskevopoulos, K. M.; Mahanti, S. D.; Torbrügge, T.; Eckert, H.; Kanatzidis, M. G. (2007)
      KSb5S8 and its solid solution analogs with Rb and Tl were found to exhibit a reversible and tunable glass→crystal→glass phase transition. Selected members of this series were analyzed by differential scanning calorimetry ...
    • 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  

      Nitric-oxide reductase: Structure and properties of the catalytic site from resonance Raman scattering 

      Pinakoulaki, Eftychia; Gemeinhardt, S.; Saraste, M.; Varotsis, Constantinos (2002)
      We have applied resonance Raman spectroscopy to investigate the properties of the dinuclear center of oxidized, reduced, and NO-bound nitric-oxide reductase from Paracoccus denitrificans. The spectra of the oxidized enzyme ...
    • Article  

      Nitrite coordination in myoglobin 

      Ioannou, Androulla; Lambrou, Alexandra; Daskalakis, Vangelis; Pinakoulaki, Eftychia (2017)
      The coordination of nitrite in myoglobin (Mb) has been characterized by resonance Raman spectroscopy and the frequencies of the nitrite bound to the heme Fe as well to the 2-vinyl have been computed by density functional ...
    • Article  

      Probing nitrite coordination in horseradish peroxidase by resonance Raman spectroscopy: Detection of two binding sites 

      Ioannou, Androulla; Pinakoulaki, Eftychia (2017)
      Nitrite is a powerful oxidant that affects the activity of peroxidases towards various substrates and leads to heme macrocycle modifications in members of the peroxidase family, such as the horseradish peroxidase (HRP). ...
    • Article  

      The production and decay kinetics of CIOO in water and freon-11: A time-resolved resonance Raman study 

      Hayes, Sophia C.; Thomsen, C. L.; Reid, P. J. (2001)
      The production and decay kinetics of ClOO in water and freon-11 were studied using time-resolved resonance Raman (TRRR) spectroscopy. The formation of ClOO following OClO photoexcitation at 390 nm was investigated using ...
    • Article  

      Raman spectroscopy using a fiber optic probe with subwavelength aperture 

      Tsai, D. P.; Othonos, Andreas S.; Moskovits, M.; Uttamchandani, D. (1994)
      Raman spectroscopy with subwavelength spatial resolution of a diamond sample was recorded using a tapered fiber optical probe in conjunction with a conventional Raman spectrometer. The experiment demonstrates the potential ...
    • Article  

      Resonance raman spectroscopy of nitric oxide reductase and cbb3 Heme-Copper oxidase 

      Pinakoulaki, Eftychia; Varotsis, Constantinos (2008)
      Elucidating the structure and properties of the active sites in cbf 3 heme-copper oxidase and in nitric oxide reductase (Nor) is crucial in understanding the reaction mechanisms of oxygen and nitric oxide reduction by both ...
    • Doctoral Thesis  Open Access

      Resonance Raman studies on nitryl chloride dissolved in methanol 

      Trimithioti, Marilena N. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2013-10)
      Η κατανόηση των βασικών πτυχών της εξάρτησης της δραστικότητας ενός συστήματος απο τη φάση στην οποία βρίσκεται αποτελεί σημαντική πρόκληση για την ατμοσφαιρική Χημεία. Αυτή η περιοχή της περιβαλλοντικής χημείας είναι στενά ...
    • 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  

      Spectroscopic investigations on the effect of humic acid on the formation and solubility of secondary solid phases of Ln2(CO3) 3 

      Antoniou, Stella; Pashalidis, Ioannis; Gessner, A.; Kumke, M. U. (2011)
      The formation of secondary Ln(III) solid phases (e.g., Nd 2(CO3)3 and Sm2(CO3) 3) was studied as a function of the humic acid concentration in 0.1 mol/L NaClO4 aqueous solution in the neutral pH range (5-6.5). The solid ...
    • Doctoral Thesis  Open Access

      Spectroscopic studies of molecular conformations of conjugated polymers for OPV applications 

      Lariou, Eirini S. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2019-12)
      Τα οργανικά ηλεκτρονικά είναι ένας επιστημονικός κλάδος που προέκυψε ως μια ελκυστική εναλλακτική στην τεχνολογία πυριτίου λόγο του σημαντικά μειωμένου κόστους παραγωγής καθώς και κάποιων επιπλέον δυνατοτήτων που προσφέρουν ...
    • Article  

      Spin Crossover in Nitrito-Myoglobin as Revealed by Resonance Raman Spectroscopy 

      Lambrou, Alexandra; Ioannou, Androulla; Pinakoulaki, Eftychia (2016)
      The myoglobin (Mb) heme Fe-O-N=O and heme Fe-O-N=O/2-nitrovinyl species have been characterized by resonance Raman spectroscopy. In the heme Fe-O-N=O species, the bound nitrite ligand is removed by solvent exchange, thus ...