Patent ID: 11857926
Assignee: NEC CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A single-walled carbon nanotube separation method comprising:
forming a pH gradient such that pHs increase from a bottom to a top in a vertical direction in an electrophoresis tank;
applying a direct current to a first electrode disposed in an upper part of the electrophoresis tank and a second electrode disposed in a lower part of the electrophoresis tank, the first and second electrodes being separated from each other in the vertical direction;
in a state in which the pH gradient is formed, injecting a first liquid having a first pH into the electrophoresis tank through a first injection port provided in one side surface of the electrophoresis tank;
in the state in which the pH gradient is formed, injecting a second liquid having a second pH lower than the first pH through a second injection port provided below the first injection port of the one side surface into the electrophoresis tank; and
recovering a third liquid through a first recovery port provided at a position in which the first recovery port faces the first injection port and a fourth liquid through a second recovery port provided at a position in which the second recovery port faces the second injection port, the first recovery port being separated from the first injection port in a horizontal direction, the first and second electrodes being provided between the first injection port and the first recovery port when seen from the vertical direction, the second recovery port being separated from the second injection port in the horizontal direction,
wherein at least one of the first and second liquids is a first dispersion having first single-walled carbon nanotubes dispersed therein, and
wherein the first dispersion is separable into a dispersion in which single-walled carbon nanotubes mainly containing metallic single-walled carbon nanotubes are dispersed and a dispersion in which single-walled carbon nanotubes mainly containing semiconducting single-walled carbon nanotubes are dispersed.