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US 12,722,977 B2Granted
Carbon film
AssigneeZeon Corporation
InventorsTomoko Yamagishi, Yoshihisa Takeyama
Life of this patent
Estimating the term…
Abstract
A carbon film excellent in electromagnetic shielding performance is provided. The carbon film is made of a carbon nanotube assembly and has a fractal dimension of 2.6 or more and 4 or less in a wavenumber range of 0.0001 (1/Å) or more and 0.001 (1/Å) or less when a scattering profile obtained by performing ultra-small-angle X-ray scattering on at least one surface of the carbon film is fitted to the Beaucage equation, while having a porosity of 80% or more and 95% or less.
Claims5
A carbon film made of a carbon nanotube assembly,
- the carbon film having a fractal dimension of 2.6 or more and 4 or less in a wavenumber range of 0.0001 (1/Å) or more and 0.001 (1/Å) or less when a scattering profile obtained by performing ultra-small-angle X-ray scattering on at least one surface of the carbon film is fitted to Beaucage equation shown below to obtain a fractal dimension Pi at each hierarchy i, the fractal dimension being P1 corresponding to hierarchy i=1, while having a porosity of 80% or more and 95% or less:
- I
-
- (
- q
- )
- =
- Bkgd
- +
- ∑
- j
- =
- 1
- N
- G
- i
-
- exp
-
- (
- -
- q
- 2
-
- R
- g
- ,
- i
- 2
- /
- 3
- )
- +
- B
- i
- [
- erf
-
- (
- qR
- g
- ,
- s
- /
- 6
- )
- ]
- 3
-
- P
- i
- q
- P
- i
- (
- I
- )
- where q represents the wavenumber (1/Å), I(q) represents the scattering intensity at the wavenumber q, Bkgd represents the background, Gi and Bi represent the proportional constant, Pi represents the fractal dimension at the hierarchy i, Rg,i represents a structural length at the hierarchy i, and N represents the number of hierarchies.
55 more elements
Dependencies are inferred from the claim text.