Radial thermal expansion of single-walled carbon nanotube bundles at low   temperatures
  The linear coefficient of the radial thermal expansion has been measured on a system of SWNT bundles in an interval of 2.2 - 120K. The measurement was performed using a dilatometer with a sensitivity of 2*10-9 cm. The cylindrical sample 7 mm high and 10 mm in diameter was obtained by compressing powder. The resulting bundles of the nanotubes were oriented perpendicular to the sample axis. The starting powder contained over 90% of SWNTs with the outer diameter 1.1 nm, the length varying within 5-30 um. 
A.V. Dolbin (1), V.B. Esel'son (1), V.G. Gavrilko (1), V.G. Manzhelii   (1), N.A.Vinnikov (1), S.N. Popov (1), B. Sundqvist ...