Patent ID: 9114995
Filing Date: 2015-08-25
Classification: B03C,B82Y,C01B,Y10S

Abstract:
1. A process of sorting metallic single wall carbon nanotubes (SWNTs) from semiconducting SWNTs, comprising: A. disposing the metallic SWNTs and the semiconducting SWNTs in a dilute fluid; B. applying a varying dipole-inducing magnetic field to the metallic SWNTs and the semiconducting SWNTs in the dilute fluid, including varying the dipole-inducing magnetic field with time so as alternately increase the dipole-inducing magnetic field with time and decrease the dipole-inducing magnetic field with time, and in which the applying a varying dipole-inducing magnetic field includes: i. providing an upper dipole-inducing electromagnetic coil and a lower dipole-inducing magnetic coil; ii. applying to the upper dipole-inducing electromagnetic coil a current with a triangular profile waveform; and iii. applying to the lower dipole-inducing electromagnetic coil a current with a triangular profile waveform that is synchronized with the triangular profile waveform of the current in the upper dipole-inducing electromagnetic coil; and C. applying a spatial gradient magnetic field to the metallic SWNTs and the semiconducting SWNTs in the dilute fluid, including: i. providing an upper gradient electromagnetic coil and a lower gradient magnetic coil; ii. applying to the upper gradient electromagnetic coil a current with a square-wave profile waveform; and iii. applying to the lower gradient electromagnetic coil a current with a square-wave profile waveform that is synchronized with the square-wave profile waveform of the current in the upper gradient electromagnetic coil.