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Browsing by Subject "Transmission electron microscopy"

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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 ...

    • Article  

      Design of ball-milling experiments on Bi2Te3 thermoelectric material 

      Kanatzia, A.; Papageorgiou, Ch; Lioutas, Ch; Kyratsi, Theodora (2013)
      In this work, factorial ball-milling experiments have been applied to Bi2Te3 material, for the first time, aiming to investigate the effect of the main process parameters on the structural features and thermoelectric ...

    • Article  

      Dry reforming of methane over 5 wt% Ni/Ce1-xPrxO2-δ catalysts: Performance and characterisation of active and inactive carbon by transient isotopic techniques 

      Vasiliades, Michalis A.; Makri, M. M.; Djinović, P.; Erjavec, B.; Pintar, A.; Efstathiou, Angelos M. (2016)
      The effects of Ce1-xPrxO2-δ support composition (x = 0.0–0.8) and reaction temperature (550–750 °C) on the catalytic activity and selectivity and important features of the mechanism of the dry reforming of methane (DRM) ...

    • Article  

      Effect of silicon nitride/oxide on the structure and the thermal conductivity of CoSi nanocomposites 

      Ioannou, M.; Delimitis, A.; Symeou, E.; Giapintzakis, John; Kyratsi, Theodora (2017)
      In this work, the fabrication of nanocomposites with silicon nitride/oxide into the thermoelectric matrix of cobalt silicide is presented. The different concentrations of nano-Si3N4 were intentionally introduced by mechanical ...

    • Conference Object  

      Electron microscopy study of thermoelectric (BixSb1-x)2Te3thin film 

      Breza, A.; Lioutas, C. B.; Giapintzakis, John (Springer Science and Business Media, LLC, 2015)
      In the present work, transmission electron microscopy (TEM) techniques were used in order to study the morphology and investigate the structural properties of a (BixSb1-x)2Te3(BST) thin film. The sample was fabricated on ...

    • Article  

      Evaluating the microstructure and performance of nanocomposite PVD TiAlBN coatings 

      Baker, M. A.; Klose, S.; Rebholz, Claus; Leyland, A.; Matthews, A. (2002)
      Physical vapour deposition (PVD) TiAlBN coatings can exhibit excellent wear resistance, with optimised coating compositions demonstrating a 150% increase in lifetime compared to standard TiAlN coatings in wet-cutting drill ...

    • Article  

      Fabrication and characterization of superparamagnetic poly(vinyl pyrrolidone)/poly(L-lactide)/Fe3O4 electrospun membranes 

      Savva, I.; Constantinou, D.; Marinica, O.; Vasile, E.; Vekas, L.; Krasia-Christoforou, T. (2014)
      The fabrication of magnetoactive fibrous nanocomposite membranes based on poly(vinyl pyrrolidone) (PVP), poly(L-lactide) (PLLA) and pre-formed oleic acid coated magnetite nanoparticles (OA Fe3O4) is presented. The ...

    • Article  

      Fabrication of nanocrystalline Mg 2Si via ball milling process: Structural studies 

      Ioannou, M.; Hatzikraniotis, E.; Lioutas, C.; Hassapis, T.; Altantzis, T.; Paraskevopoulos, K. M.; Kyratsi, Theodora (2012)
      In this work, nanocrystalline Mg 2Si material was fabricated via wet ball milling process using n-hexane as process control agent. Milling parameters, with emphasis on milling time and ball size, and conditions were studied ...

    • Article  

      Fabrication, characterization and applications of novel nanoheater structures 

      Gu, Z.; Cui, Q.; Chen, J.; Buckley, J.; Ando, T.; Erdeniz, D.; Wong, P.; Hadjiafxenti, A.; Epaminonda, P.; Gunduz, I. E.; Rebholz, Claus; Doumanidis, C. C. (2013)
      Nanoheaters are reactive nanostructures that can generate localized heat through controlled ignition. Besides the widely used nanofoil structure with multiple alternative Al-Ni layers, various new nanostructures have been ...

    • Article  

      Few-layer graphene-like flakes derived by plasma treatment: A potential material for hydrogen adsorption and storage 

      Kostoglou, N.; Tarat, A.; Walters, I.; Ryzhkov, V.; Tampaxis, C.; Charalambopoulou, Georgia; Steriotis, T.; Mitterer, C.; Rebholz, Claus (2016)
      A novel, one-step, wet-free, environmental friendly and high-yield method for producing few-layer graphene powders with large surface areas (up to 800 m2/g) and narrow nanopore sizes (0.7-0.8 nm) using plasma-induced ...

    • Article  

      Formation mechanism of nanotubes comprising layers of PbS nanoparticles in polymer-surfactant solutions 

      Orphanou, M.; Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Krumeich, F.; Kyriacou, Kyriacos C. (2006)
      The crystallization of PbS in aqueous solutions containing the surfactant sodium dodecyl sulfate (SDS) and hydrophilic polymers resulted in a novel type of metastable nanotubes, the walls of which consist of layers of ...

    • Article  

      From beads-on-a-string to colloidal aggregation: novel crystallization phenomena in the PEO-SDS system 

      Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Kyriacou, Kyriacos C. (1999)
      The anionic surfactant sodium dodecyl sulfate (SDS) interacts strongly with poly(ethylene oxide) (PEO) in aqueous solution, forming micellar aggregates attached to the polymer chains above the so-called critical association ...

    • Article  

      From colloidal aggregates to layered nanosized structures in polymer-surfactant systems. 1. Basic phenomena 

      Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Robyr, P.; Krumeich, F.; Kyriacou, Kyriacos C. (2001)
      In this work, we examine the rich crystallization behavior that occurs in PbII/S-II/poly(ethylene oxide) (PEO)/sodium dodecyl sulfate (SDS) systems, in which the anionic surfactant interacts strongly with the polymer ...

    • 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  

      N2O decomposition over ceria-promoted Ir/Al2O3 catalysts: The role of ceria 

      Pachatouridou, E.; Papista, E.; Delimitis, Andréas; Vasiliades, Michalis A.; Efstathiou, Angelos M.; Amiridis, Michael D.; Alexeev, O. S.; Bloom, D.; Marnellos, G. E.; Konsolakis, M.; Iliopoulou, E. (2016)
      The impact of CeO2 in the Al2O3-20wt% CeO2 support prepared by the co-precipitation method on the Ir particle size, morphology and oxidation state, and in turn on the deN2O catalytic activity (1000ppmN2O) of supported Ir ...

    • Article  

      Nanostructural studies of PVD TiAlB coatings 

      Monclus, M. A.; Baker, M. A.; Rebholz, Claus; Stolojan, V.; Gibson, P. N.; Leyland, A.; Matthews, A. (2006)
      TiAlB coatings with different compositions were deposited by co-sputtering from TiAl and TiB2 targets onto AISI316 stainless steel substrates at a temperature of 170 °C. The stoichiometry and nanostructure have been studied ...

    • Article  

      Palladium-based micellar nanohybrids: Preparation and nonlinear optical response 

      Papagiannouli, I.; Demetriou, M.; Krasia-Christoforou, T.; Couris, S. (2014)
      In the present work the synthesis and physicochemical characterisation of a new class of Pd-containing micellar nanohybrid systems are presented. The new systems consist of metallic Pd nanoparticles and well-defined diblock ...

    • Article  

      Reversible hydrogels from amphiphilic polyelectrolyte model multiblock copolymers: The importance of macromolecular topology 

      Popescu, M. -T; Athanasoulias, I.; Tsitsilianis, C.; Hadjiantoniou, Natalie A.; Patrickios, Costas S. (2010)
      The association ability of model amphiphilic polyelectrolytes with multi-block architecture, i.e. ABA, BABAB, ABABABA and BABABABAB (A hydrophobic, B polyelectrolyte block) was studied in aqueous media. The gelation ...

    • Article  

      Room temperature synthesis and high temperature frictional study of silver vanadate nanorods 

      Singh, D. P.; Polychronopoulou, K.; Rebholz, Claus; Aouadi, S. M. (2010)
      We report the room temperature (RT) synthesis of silver vanadate nanorods (consisting of mainly β-AgVO3) by a simple wet chemical route and their frictional study at high temperatures (HT). The sudden mixing of ammonium ...

    • Conference Object  

      A schottky tunnel barrier contact for electrical spin injection from a magnetic metal into a semiconductor 

      Hanbicki, A. T.; Stroud, R. M.; Magno, R.; Kioseoglou, G.; Li, C. H.; Jonker, B. T.; Itskos, Grigorios; Mallory, R.; Yasar, M.; Petrou, Athos Chariton (2003)
      A study was performed on a Schottky tunnel barrier contact for electrical spin injection from a magnetic metal into a semiconductor. It was reported that spin injection from a Fe Schottky contact produced a spin polarization ...

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