Carbon nanotube aggregate, carbon nanotube aggregate having a three-dimensional shape, carbon nanotube molded product using the carbon nanotube aggregate, composition, and carbon nanotube dispersion liquid

Patent metadata

Field	Value
Publication number	US-9809457-B2
Application number	US-201313916957-A
Country	US
Kind code	B2
Filing date	Jun 13, 2013
Priority date	Dec 15, 2010
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

The present invention is a carbon nanotube aggregate having a three-dimensional shape. The carbon nanotube aggregate having a three-dimensional shape includes a first surface, a second surface and a side surface, wherein a carbon nanotube of the first surface has a Herman orientation coefficient greater than −0.1 and smaller than 0.2, a carbon nanotube of the second surface has a Herman orientation coefficient greater than −0.1 and smaller than 0.2, and a carbon nanotube of the side surface has degree of orientation in which a Herman orientation coefficient is 0.2 or more and 0.99 or less, and the first surface and second surface are mutually arranged in parallel and the side surface is perpendicular with respect to the first surface and second surface.

First claim

The invention claimed is:

1. A carbon nanotube aggregate having a three-dimensional shape comprising:
a first surface, a second surface and a side surface;
wherein
a carbon nanotube of the first surface has a Herman orientation coefficient greater than −0.1 and smaller than 0.2,
a carbon nanotube of the second surface has a Herman orientation coefficient greater than −0.1 and smaller than 0.2,
a carbon nanotube of the side surface has a degree of orientation in which a Herman orientation coefficient is 0.2 or more and 0.99 or less,
the first surface and the second surface are mutually arranged in parallel and the side surface is perpendicular with respect to the first surface and the second surface,
at least one of the first surface or the second surface comprises a network of carbon nanotubes, and
a pore volume is 5 mL/g or more at a pore size where the differential pore volume of the carbon nanotube aggregate having a three-dimensional shape is a maximum.

2. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein when a carbon nanotube aggregate comprising the carbon nanotube aggregate having a three-dimensional shape is measured by a mercury intrusion porisometer and differential pore volumes are logarithmically plotted with respect to each pore diameter, and the carbon nanotube aggregate has a differential pore volume maximum in a range of 1 μm or more and 50 μm or less of the pore diameter plotted.

3. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein the length of the side surface is 10 μm or more and 1 cm or less.

4. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein the first surface and said second surface of the carbon nanotube aggregate having a three-dimensional shape are each arranged with at least three sides respectively.

5. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein an angle of repose of a carbon nanotube aggregate including the carbon nanotube aggregate having a three-dimensional shape is 40 degrees or more and 85 degrees or less.

6. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein a bulk density of a carbon nanotube aggregate including the carbon nanotube aggregate having a three-dimensional shape is 0.001 g/cm3 or more and 0.19 g/cm3 or less.

7. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein a maximum pore size distribution of a carbon nanotube aggregate including the carbon nanotube aggregate having a three-dimensional shape calculated using a BJH method from an adsorption isotherm using liquid nitrogen is 100 nm or less.

8. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein the carbon nanotube aggregate having a three-dimensional shape includes a fissure.

9. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein the outermost surface is arranged with carbon nanotube separable part pieces consisting of a carbon nanotube aggregate, the carbon nanotube separable part pieces are carbon nanotube aggregates before being broken from the carbon nanotube aggregate having a three-dimensional shape.

10. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein the outermost surface is formed by arranging a plurality of carbon nanotube separable part pieces arranged with a bundle of carbon nanotubes.

11. The carbon nanotube aggregate having a three-dimensional shape according to claim 10 wherein the bundle is peeled and extends from the carbon nanotube piece forming the side surface.

12. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein a carbon nanotube aggregate including the carbon nanotube aggregate having a three-dimensional shape possesses a carbon purity of 98% or more measured by a fluorescent X-ray.

13. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein a carbon nanotube aggregate including the carbon nanotube aggregate having a three-dimensional shape includes carbon nanotubes with a specific surface area of or 800 m2/g or more and 2500 m2/g or less.

14. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein weight loss in thermogravimetry when the carbon nanotube aggregate including the carbon nanotube aggregate having a three-dimensional shape is increased in temperature from 200° C. to 400° C. in increments of 1° C. per minute is 10% or less.

15. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein carbon nanotubes forming the carbon nanotube aggregate having a three-dimensional shape is a single-walled carbon nanotube.

16. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein the carbon nanotube bundles extend to an adjacent carbon nanotube aggregate having a three-dimensional shape.

17. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein the length of the bundles of carbon nanotubes is 1 μm or more and 1 mm or less.

18. The carbon nanotube aggregate having a three-dimensional shape according to claim 1 wherein a shape of the carbon nanotube aggregate is selected from a flake shape, powder shape, granule shape, thin leaf shape and block shape.

Assignees

• Nat Inst Advanced Ind Science & Tech

Inventors

• Hata Kenji
• Futaba Don N

Classifications

• B82Y30/00 Primary

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01P2004/13

  Nanotubes · CPC title

• C01B32/00

  Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48) · CPC title

• C01P2006/16

  Pore diameter · CPC title