| 摘要 |
The present invention provides a chemically functionalized submicron graphitic fibril having a diameter or thickness less than 1 μm, wherein the fibril is free of continuous thermal carbon overcoat, free of continuous hollow core, and free of catalyst. The fibril is obtained by splitting a micron-scaled carbon fiber or graphite fiber along the fiber axis direction. These functionalized graphitic fibrils exhibit exceptionally high electrical conductivity, high thermal conductivity, high elastic modulus, high strength and good interfacial bonding with a matrix resin in a composite. The present invention also provides several products that contain submicron graphitic fibrils: (a) paper, thin-film, mat, and web products; (b) rubber or tire products; (c) energy conversion or storage devices, such as fuel cells, lithium-ion batteries, and supercapacitors; (d) adhesives, inks, coatings, paints, lubricants, and grease products; (e) heavy metal ion scavenger; (f) absorbent (e.g., to recover spill oil); (g) sensors; (h) friction and brake components; (i) radiation-shield components; (j) catalyst carrier; and (k) composite materials. |
| 主权项 |
1. A chemically functionalized submicron graphitic fibril having a thickness greater than 100 nm and less than 1 μm and a length-to-thickness ratio no less than 5, wherein said fibril is obtained by splitting a micron-diameter carbon fiber or graphite fiber, wherein throughout the fibril, said fibril is free of continuous thermal carbon overcoat, free of continuous hollow core, and free of catalyst, and said fibril comprises at least 95% by weight carbon atoms arranged in a hexagon or grapheme structure that is a graphite single crystal, and said fibril has a chemical functional group attached to a surface of said fibril.
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