Carbon nanotubes were suspended in carbon tetrachloride and placed in magnetic fields of <80.0 kOe at 310K. Scanning electron microscopy showed that a single and free nanotube was oriented with the tube axisparallel to the fields. From the Boltzmann distribution of tube directions, the anisotropy of susceptibilitiesparallel (χ∥) and perpendicular (χ⊥) to the tube axis is estimated to be χ∥ − χ⊥ ∼ (9 ± 5) × 10-6 emu permole of carbon atoms (χ⊥< χ∥< 0).
