Method of forming carbon nanotubes from carbon-rich fly ash
US8609189B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 2011 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | Mar 15, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y40/00
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
The method of forming carbon nanotubes from carbon-rich fly ash is a chemical vapor deposition-based method for forming carbon nanotubes from recycled carbon-rich fly ash. The method includes first ultrasonically treating the carbon-rich fly ash to produce an ultrafine powdered ash, and then reacting the ultrafine powdered ash in a low pressure chemical vapor deposition reactor to form the carbon nanotubes. The ultrasonic treatment of the carbon-rich fly ash includes the steps of dissolving the carbon-rich fly ash in water to form a solution, then sonicating the solution, separating the ultrafine powdered ash from the solution, and finally drying the ultrafine powdered ash. The method provides for total conversion of the carbon-rich fly ash to carbon nanotubes having a variety of differing diameters and lengths, including multi-walled carbon nanotubes with a high degree of wall graphitization and C═C double bonds stretching at 1635 cm−1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.