Purification of swnt Raw materials Reflux in HNO3 SWNT SWNT .Small carbon pieces Amorphous carbon soluble in basic ho Catalytic particles Catalytic particles Cross Flow Filtration Strong magnet . SWNT SWNT Catalytic particles (Jie Liu et al, Science, 280, 1253-1256Purification of SWNT •SWNT •Small carbon pieces soluble in basic H 2 O •Catalytic parti cles Reflux i n HNO 3 Raw Materials: •SWNT •Amorphous carbon •Catalytic parti cles Cross Flow Filtration •SWNT •Catalytic parti cles Strong magnet •SWNT (Jie Liu et al., Science, 280, 1253-1256)