US10611640B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10611640-B2 |
| Application number | US-201615574493-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 26, 2016 |
| Priority date | May 27, 2015 |
| Publication date | Apr 7, 2020 |
| Grant date | Apr 7, 2020 |
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Provided are a carbon film having excellent electrical conductivity and a method of producing this carbon film. The carbon film has a film surface glossiness at 60° of at least 2 and not more than 500. The method of producing the carbon film includes forming a carbon film by removing a solvent from a fibrous carbon nanostructure dispersion liquid containing the solvent and one or more fibrous carbon nanostructures.
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The invention claimed is: 1. A carbon film having a film surface glossiness at 60° of at least 2 and not more than 500, wherein the carbon film comprises one or more fibrous carbon nanostructures, the fibrous carbon nanostructures have an average structure length of at least 100 μm and not more than 5,000 μm, and a content of the fibrous carbon nanostructures in the carbon film is 75 mass % or more. 2. The carbon film according to claim 1 , wherein the fibrous carbon nanostructures exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm. 3. A method of producing the carbon film according to claim 1 , comprising forming a carbon film by removing a solvent from a fibrous carbon nanostructure dispersion liquid containing the solvent and the fibrous carbon nanostructures. 4. The method of producing a carbon film according to claim 3 , wherein the fibrous carbon nanostructure dispersion liquid has a dispersion rate (%) of 80% or more as determined by B/A×100, where A is light absorbance of the fibrous carbon nanostructure dispersion liquid and B is light absorbance of a supernatant obtained upon subjecting the fibrous carbon nanostructure dispersion liquid to centrifugal separation for 1 hour at 10,000 G. 5. The method of producing a carbon film according to claim 3 , wherein the fibrous carbon nanostructures exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm. 6. A fibrous carbon nanostructure dispersion liquid comprising one or more fibrous carbon nanostructures and a solvent, wherein the fibrous carbon nanostructures have an average structure length of at least 100 μm and not more than 5,000 μm, and the fibrous carbon nanostructure dispersion liquid has a dispersion rate (%) of 80% or more as determined by B/A×100, where A is light absorbance of the fibrous carbon nanostructure dispersion liquid and B is light absorbance of a supernatant obtained upon subjecting the fibrous carbon nanostructure dispersion liquid to centrifugal separation for 1 hour at 10,000 G. 7. The fibrous carbon nanostructure dispersion liquid according to claim 6 , wherein the fibrous carbon nanostructures exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm. 8. The fibrous carbon nanostructure dispersion liquid according to claim 6 , further comprising a dispersant. 9. A method of producing a fibrous carbon nanostructure dispersion liquid, comprising obtaining a fibrous carbon nanostructure dispersion liquid by performing dispersion treatment in which pressure is applied to a coarse dispersion liquid obtained through addition of one or more fibrous carbon nanostructures to a solvent such as to feed the coarse dispersion liquid into a narrow tubular flow path and shear force is imparted on the coarse dispersion liquid to disperse the fibrous carbon nanostructures, wherein the dispersion treatment includes first dispersion treatment in which a pressure of 60 MPa to 250 MPa is applied to the coarse dispersion liquid and second dispersion treatment in which a pressure of 5 MPa to 30 MPa is applied to the coarse dispersion liquid, and the first dispersion treatment has an average dispersion treatment count θ of 5 to 30 and the second dispersion treatment has an average dispersion treatment count θ of 1 to 20.
Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title
mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title
Derivatisation; Solubilisation; Dispersion in solvents · CPC title
single-walled · CPC title
characterised by catalysts · CPC title
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