公开(公告)号：US20240343583A1

公开(公告)日：2024-10-17

申请号：US18683737

申请日：2022-08-17

Applicant: OSAKA SODA CO., LTD.

Inventor： Yasushi KONDA ,  Mei SUEOKA ,  Hayato WATANABE

IPC: C01B32/174

CPC classification number: C01B32/174 ,  C01B2202/30 ,  C01B2202/36 ,  C01P2002/82 ,  C01P2006/22 ,  C01P2006/80

Abstract: Provided is an aqueous carbon nanotube dispersion with excellent dispersibility of carbon nanotubes in water. An aqueous carbon nanotube dispersion containing carbon nanotubes dispersed in water, wherein the carbon nanotubes have a mean particle diameter (D50) of 1 μm or less, and when the carbon nanotubes are prepared as an aqueous dispersion with a concentration of 0.1% by mass, a spin-spin relaxation time (T22) of a second component is 1000 msec or less as measured by a measurement method as set forth below:

The spin-spin relaxation time (T22) of the second component is calculated by fitting a relaxation curve measured at 30° C. using an H nuclear CPMG pulse sequence method to a curve represented by expression (1):











y
⁡
(
t
)

=



a
01

×

exp
[

-

(


t
/
T

⁢
21

)


]


+


a
02

×

exp
[

-

(


t
/
T

⁢
22

)


]


+

y
0






expression
⁢


(
1
)











where:
t is a capture time;
y(t) is a signal intensity at capture time t;
T21 is a spin-spin relaxation time of a first component;
T22 is the spin-spin relaxation time of the second component; and
y0 is a signal intensity at capture time 0.