METHOD FOR SEPARATING SINGLE-WALL CARBON NANOTUBES AND COMPOSITIONS THEREOF

Title:

METHOD FOR SEPARATING SINGLE-WALL CARBON NANOTUBES AND COMPOSITIONS THEREOF

Document Type and Number:

WIPO Patent Application WO2003084869

Kind Code:

A3

Abstract:

The invention relates to a process for sorting and separating a mixture of (n, m) type single-wall carbon nanotubes according to (n, m) type. A mixture of (n, m) type single-wall carbon nanotubes is suspended such that the single-wall carbon nanotubes are individually dispersed. The nanotube suspension can be done in a surfactant-water solution and the surfactant surrounding the nanotubes keeps the nanotube isolated and from aggregating with other nanotubes. The nanotube suspension is acidified to protonate a fraction of the nanotubes. An electric field is applied and the protonated nanotubes migrate in the electric fields at different rates dependent on their (n, m) type. Fractions of nanotubes are collected at different fractionation times. The process of protonation, applying an electric field, and fractionation is repeated at increasingly higher pH to separated the (n, m) nanotube mixture into individual (n, m) nanotube fractions. The separation enables new electronic devices requiring selected (n, m) nanotube types.

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Inventors:

SMALLEY RICHARD E (US)
HAUGE ROBERT H (US)
KITTRELL W CARTER (US)
SIVARAJAN RAMESH (US)
STRANO MICHAEL S (US)
BACHILO SERGEI M (US)
WEISMAN R BRUCE (US)

Application Number:

PCT/US2003/006536

Publication Date:

October 07, 2004

Filing Date:

March 04, 2003

Export Citation:

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Assignee:

UNIV RICE WILLIAM M (US)
SMALLEY RICHARD E (US)
HAUGE ROBERT H (US)
KITTRELL W CARTER (US)
SIVARAJAN RAMESH (US)
STRANO MICHAEL S (US)
BACHILO SERGEI M (US)
WEISMAN R BRUCE (US)

International Classes:

G01N21/78; C01B31/02; G01N21/64; G01N27/447; G01N30/88; G01N33/574; G01N33/58; (IPC1-7): C01B31/02; H01L31/0232

Domestic Patent References:

WO1998039250A1

1998-09-11

Foreign References:

US20020025291A1	2002-02-28
EP0949199A1	1999-10-13

Other References:

P. UMEK ET AL.: "Separation of SWNTs by diffusion", SYNTHETIC METALS, vol. 121, 2001, amsterdam, pages 1211 - 1212, XP002267393
PATENT ABSTRACTS OF JAPAN vol. 018, no. 610 (C - 1276) 21 November 1994 (1994-11-21)

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