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    STUDIA CHEMIA - Issue no. 2 / 2008  
         
  Article:   TEMPERATURE-INDEPENDENT LONGITUDINAL WAVES OBTAINED ON CARBON NANOTUBES WITH SPECIAL EMPHASIS ON THE TUBULAR ION-TRANSPORT.

Authors:  BEÁTA PELES-LEMLI, JÁNOS PELES-LEMLI, LÁSZLÓ KOLLÁR, GÉZA NAGY, SÁNDOR KUNSÁGI-MÁTÉ.
 
       
         
  Abstract:   The vibration properties of two representative types of achiral carbon nanotubes were investigated by temperature dependent MDs calculations. The changes of the diameters of SWCNTs in time were calculated using the distances between the two opposite atoms of the nanotube. Periodical changes of diameters of nanotube’s cross-section ellipsoid were obtained in picosecond time-scale. Our results show that a longitudinal wave of conformation change travels along the longitudinal axis of the nanotube. A kind of travelling with 20 nm/ps speed pulsation could be observed of the elliptic cross section through a circular instant. This finding corresponds to the transport of ions or molecules in the nanotube, since these particles are preferred to be kept in the symmetric circle cross section of the nanotube.  
         
     
         
         
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