US 12,215,027 B2
Nanocarbon separation method and nanocarbon separation apparatus
Fumiyuki Nihey, Tokyo (JP); and Hideaki Numata, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 16/647,142
Filed by NEC CORPORATION, Tokyo (JP)
PCT Filed Sep. 29, 2017, PCT No. PCT/JP2017/035517
§ 371(c)(1), (2) Date Mar. 13, 2020,
PCT Pub. No. WO2019/064499, PCT Pub. Date Apr. 4, 2019.
Prior Publication US 2020/0277194 A1, Sep. 3, 2020
Int. Cl. B32B 9/00 (2006.01); B01D 57/02 (2006.01); C01B 32/159 (2017.01); C01B 32/172 (2017.01)
CPC C01B 32/172 (2017.08) [B01D 57/02 (2013.01); C01B 32/159 (2017.08); C01B 2202/22 (2013.01); Y10T 428/30 (2015.01)] 12 Claims
OG exemplary drawing
 
1. A nanocarbon separation method, comprising:
preparing a nanocarbon dispersion liquid in which a nanocarbon and a non-ionic surfactant are dispersed in a solvent;
injecting the nanocarbon dispersion liquid into a separation tank;
applying a direct current voltage to a first electrode provided at an upper part of the interior of the separation tank and a second electrode provided at a lower part of the interior of the separation tank and generating a pH gradient in the nanocarbon dispersion liquid inside the separation tank; and
separating metallic nanocarbons and semiconductor nanocarbons included in the nanocarbon dispersion liquid,
wherein an amount of the non-ionic surfactant in the nanocarbon dispersion liquid in the separation tank is 1 wt % or more and 5 wt % or less.