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These cut tubes were prepared in a two-step process:
cutting and polishing. In a typical example, 10 mg of the
purified SWNT ¡°bucky paper¡± (Fig. 1B) was suspended
in 40 ml of a 3:1 mixture of concentrated H2SO4/HNO3
in a 100-ml test tube and sonicated in awater bath [Cole
Palmer (Verona Hills, IL) model B3-R, 55 kHz] for 24
hours at 35¡ã to 40¡ãC. The resultant suspension was
then diluted with 200 ml of water, and the larger cut
SWNTs were collected on a 100-nm pore filter mem-
brane (type VCTP; Millipore) and washed with 10 mM
NaOH solution. The cut tubes were then further pol-
ished by suspension in a 4:1 mixture of concentrated
H2SO4:30% aqueous H2O2 and stirring at 70¡ãC for 30
min. After filtering and washing again on a 100-nm pore
filter, the cut nanotubes were suspended at a density of
0.1 mg/ml in water with the aid of 0.5 weight % Triton
X-100 surfactant.
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