Controlling the number of walls in multi walled carbon nanotubes/alumina hybrid compound via ball milling of precipitate catalyst

- We report that, to manipulate carbon nanotubes geometry and number of walls are by controlling the precipitate catalyst size.
- Number of walls and geometry effects depend on the milling time of the precipitate catalyst.
- Increasing milling of time will decrease the carbon nanotubes number of walls.
- Increasing milling of time will increase the carbon nanotubes thermal conductivity.