Patent · US Active

Methods of forming carbon nanotubes having a bimodal size distribution

US9896341B2 · kind B2 · utility

1Cited by
226References
16Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMar 15, 2013
Grant dateFeb 20, 2018
Priority date—
Expiry dateMar 15, 2033

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC01P2004/53
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A composition comprising a mixture of carbon nanotubes having a bi-modal size distribution are produced by reducing carbon oxides with a reducing agent in the presence of a catalyst. The resulting mixture of nanotubes include a primary population of multiwall carbon nanotubes having characteristic diameters greater than 40 nanometers, and a secondary population of what are apparently single wall nanotubes with characteristic diameters of less than 30 nanometers. The resulting mixture may also contain one or more other allotropes and morphologies of carbon in various proportions. The mixture of carbon nanotubes has specific apparently uncommon properties, including unusual resistivity and density

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.