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Browsing by Subject "Carbon nanotubes"

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    • Article  

      Carbon nanotube-reinforced crosslinked polyethylene pipes for geothermal applications: From synthesis to decomposition using analytical pyrolysis-GC/MS and thermogravimetric analysis 

      Roumeli, E.; Markoulis, A.; Kyratsi, Theodora; Bikiaris, D.; Chrissafis, K. (2014)
      Carbon nanotube reinforced crosslinked high density polyethylene (PEX) nanocomposites were synthesized for geothermal applications requiring higher polymer thermal conductivity and a comprehensive thermal decomposition ...

    • Article  

      The density of water in carbon nanotubes 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      In this paper, the density of water confined in carbon nanotubes of different sizes and chirality is calculated. Molecular dynamics is used to simulate the spontaneous filling of the nanotube with water molecules coming ...

    • Article  

      Direct observation of excitons in polymer/carbon nanotube composites at room temperature: The influence of nanotube concentration 

      Lioudakis, Emmanouil E.; Kanari, C.; Othonos, Andreas S.; Alexandrou, Ioannis (2008)
      In this work, we have employed spectroscopic ellipsometry technique to study the optical properties of polymer/carbon nanotube (CN) composites as a function of nanotube concentration. Using a two-layer structural model ...

    • 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  

      Influence of water model and nanotube rigidity on the density of water in carbon nanotubes 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      The density of water calculated through molecular dynamic simulations using different water models and rigid/flexible carbon nanotubes is studied. A previous equation, determined in an earlier work in order to correlate ...

    • Article  

      Low-temperature catalytic decomposition of ethylene into H2 and secondary carbon nanotubes over Ni/CNTs 

      Savva, Petros G.; Polychronopoulou, Kyriaki; Ryzkov, V. A.; Efstathiou, Angelos M. (2010)
      The present work reports on the production of H2 and secondary carbon nanotubes (CNTs) during catalytic decomposition of ethylene over a novel catalytic system, namely, nickel supported on carbon nanotubes (Ni/CNTs) at ...

    • Article  

      Low-temperature water-gas shift on Pt/Ce0.8La0.2O2-δ-CNT: The effect of Ce0.8La0.2O2-δ/CNT ratio 

      Petallidou, Klito C.; Polychronopoulou, Kyriaki; Fierro, José Luis García; Efstathiou, Angelos M. (2015)
      Hybrid materials of (100 - x) wt% Ce0.8La0.2O2-δ-x wt% CNT composition (x = 0, 7.5, 20.5, 32.5, 44.1 and 100) were synthesized using the urea-assisted co-precipitation method and used as supports of 0.5 wt% Pt toward the ...

    • Article  

      Molecular dynamic simulations of carbon nanotubes in CO2 atmosphere 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      This work investigates by means of molecular dynamics the filling of carbon nanotubes by carbon dioxide molecules. Nanotubes of various sizes are simulated and the resulting CO2 density calculated. The effects of various ...

    • Article  

      Molecular simulation of water in carbon nanotubes 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      The motion of water in carbon nanotubes (CNT) by numerical procedures is calculated through molecular dynamics (MD) simulation studies. The Lennard-Jones potential is a simple MD simulations technique, which combines ...

    • Article  

      Monitoring charge exchange in P3HT-nanotube composites using optical and electrical characterisation 

      Alexandrou, Ioannis; Lioudakis, Emmanouil E.; Delaportas, Dimitrios; Zhao, C. Z.; Othonos, Andreas S. (2009)
      Charge exchange at the bulk heterojunctions of composites made by mixing single wall nanotubes (SWNTs) and polymers show potential for use in optoelectronic devices such as solar cells and optical sensors. The density/total ...

    • Article  

      Self-diffusivity, hydrogen bonding and density of different water models in carbon nanotubes 

      Alexiadis, A.; Kassinos, Stavros C. (2008)
      In this paper, the density, hydrogen bonding and self-diffusivity of water confined in carbon nanotubes are investigated. Molecular dynamics is used to simulate a large variety of nanotubes with various water models. Our ...

    • Article  

      Wetting of doped carbon nanotubes by water droplets 

      Kotsalis, E. M.; Demosthenous, E.; Walther, J. H.; Kassinos, Stavros C.; Koumoutsakos, P. (2005)
      We study the wetting of doped single- and multi-walled carbon nanotubes by water droplets using molecular dynamics simulations. Chemisorbed hydrogen is considered as a model of surface impurities. We study systems with ...

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