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Browsing by Subject "Silica"

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    • Article  

      Controlled production of ZnO nanoparticles from zinc glycerolate in a sol-gel silica matrix 

      Moleski, R.; Leontidis, Epameinondas; Krumeich, F. (2006)
      The controlled production of ZnO nanoparticles within an amorphous silica matrix is achieved using a new methodology consisting of four stages. First, precursor zinc glycerolate nanoparticles are produced within reversed ...

    • Conference Object  

      Femtosecond laser inscription of Bragg and complex gratings in coated and encapsulated silica and low-loss polymer optical fibers 

      Kalli, Kyriacos; Lacraz, A.; Polis, M.; Othonos, Andreas S. (SPIE, 2015)
      The development of wavelength filters, such as Bragg and superstructure gratings in glass and polymer optical fibers, using a femtosecond laser is reported. By using a femtosecond laser operating in the green, which offers ...

    • Article  

      Hydrogen production by ethylene decomposition over Ni supported on novel carbon nanotubes and nanofibers 

      Savva, Petros G.; Olympiou, G. G.; Costa, Costas N.; Ryzhkov, V. A.; Efstathiou, Angelos M. (2005)
      Ethylene decomposition over Ni supported on novel carbon nanotubes (CNT) and nanofibers under consecutive reaction/regeneration cycles to form CO-free hydrogen and carbon deposits have been investigated. The present work ...

    • Article  

      Optical response of thin supported palladium films to hydrogen: Non-destructive testing for hydrogen detection 

      Christofides, Constantinos; Kalli, Kyriacos; Othonos, Andreas S. (1999)
      The properties of thin palladium films on silicon dioxide/silicon substrates are investigated. As the electrical properties of very thin palladium films cannot be measured, due to highly discontinuous nature of the films ...

    • 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  

      Quantum confinement and interface structure of Si nanocrystals of sizes 3-5 nm embedded in a-SiO2 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Hadjisavvas, G. C.; Kelires, P. C.; Nassiopoulou, Androula Galiouna (2007)
      Spectroscopic ellipsometry and Monte Carlo simulations are employed to answer the fundamental question whether the energy gaps of Si nanocrystals with sizes in the range of 3-5 nm, which are embedded in amorphous silica, ...

    • Article  

      Superimposed gratings WDM on Ge-doped silica on silicon planar waveguide 

      Bismuth, J.; Othonos, Andreas S.; Sweeny, M.; Kevorkian, A.; Xu, J. M. (1996)
      Wavelength-division multiplexed (WDM) devices are becoming increasingly important for fiber-optics communication and sensing systems. Large-channel fanout, low loss, and compatibility with fiber connection, laser sources ...

    • Article  

      Temperature programmed reduction of silica supported nickel catalysts 

      Afzal, M.; Theocharis, Charis R.; Karim, S. (1993)
      Nickel oxide promoted catalysts are prepared by simple precipitation, precipitation from homogeneous solution and impregnation methods and their reduction behavior is monitored with temperature programmed reduction (TPR) ...

    • Article  

      Thermoelectric properties of Bi0.5Sb1.5Te3 thin films grown by pulsed laser deposition 

      Symeou, E.; Pervolaraki, M.; Mihailescu, C. N.; Athanasopoulos, G. I.; Papageorgiou, C.; Kyratsi, Theodora; Giapintzakis, John (2015)
      We report on the pulsed laser deposition of p-type Bi0.5Sb1.5Te3 thin films onto fused silica substrates by ablation of dense targets of Bi0.5Sb1.5Te3 with an excess of 1 wt% Te. We investigated the effect of film thickness, ...

    • Article  

      Transient isotopic kinetic study of the NO/H2/O2 (lean de-NOx) reaction on Pt/SiO2 and Pt/La-Ce-Mn-O catalysts 

      Costa, Costas N.; Efstathiou, Angelos M. (2004)
      Steady-state isotopic transient kinetic analysis (SSITKA) coupled with temperature-programmed surface reaction (TPSR) methods and using in situ mass spectroscopy and DRIFTS have been applied for the first time to study ...

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