US2023086954A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2023086954-A1 |
| Application number | US-202117908006-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 1, 2021 |
| Priority date | Mar 3, 2020 |
| Publication date | Mar 23, 2023 |
| Grant date | — |
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The present invention provides pitch-based ultrafine carbon fibers containing nitrogen atoms, wherein the average fiber diameter is more than 100 nm but not more than 900 nm; the content of the nitrogen atoms as determined by X-ray photoelectron spectroscopy (XPS) is 1.00% by atom or less; and the true density is from 1.95 to 2.20 g/cm3.
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1 . A pitch-based ultrafine carbon fiber comprising a nitrogen atom, the pitch-based ultrafine carbon fiber having an average fiber diameter of more than 100 nm and 900 nm or less, having a content of the nitrogen atom measured by X-ray photoelectron spectroscopy (XPS) of 1.00 atom % or less, and having a true density of 1.95 to 2.20 g/cm 3 . 2 . The pitch-based ultrafine carbon fiber according to claim 1 , having an average aspect ratio of 30 or more. 3 . The pitch-based ultrafine carbon fiber according to claim 1 , having a distance between adjacent graphite sheets of 0.3400 nm or more, the distance measured by wide-angle X-ray measurement and represented by d002. 4 . The pitch-based ultrafine carbon fiber according to claim 1 , having a graphene as a network plane group having a thickness of 30 nm or less, the thickness measured by an X-ray diffraction method and represented by Lc. 5 . A pitch-based ultrafine carbon fiber dispersion comprising the pitch-based ultrafine carbon fiber according to claim 1 and water. 6 . The pitch-based ultrafine carbon fiber according to claim 2 , having a distance between adjacent graphite sheets of 0.3400 nm or more, the distance measured by wide-angle X-ray measurement and represented by d002. 7 . The pitch-based ultrafine carbon fiber according to claim 2 , having a graphene as a network plane group having a thickness of 30 nm or less, the thickness measured by an X-ray diffraction method and represented by Lc.
characterised by shape, e.g. fibres, flakes or microspheres · CPC title
Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title
from pitch or distillation residues · CPC title
Compounds with a limited amount of crystallinty, e.g. as indicated by a crystallinity index · CPC title
Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension · CPC title
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