WO2005085131A3 - Separation of carbon nanotubes - Google Patents

Separation of carbon nanotubes Download PDF

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Publication number
WO2005085131A3
WO2005085131A3 PCT/GB2005/000822 GB2005000822W WO2005085131A3 WO 2005085131 A3 WO2005085131 A3 WO 2005085131A3 GB 2005000822 W GB2005000822 W GB 2005000822W WO 2005085131 A3 WO2005085131 A3 WO 2005085131A3
Authority
WO
WIPO (PCT)
Prior art keywords
nanotubes
magnetic field
carbon nanotubes
metallic
separation
Prior art date
Application number
PCT/GB2005/000822
Other languages
French (fr)
Other versions
WO2005085131A2 (en
Inventor
Robin John Nicholas
Joseph Gregory Wiltshire
Lain-Jong Li
Original Assignee
Isis Innovation
Robin John Nicholas
Joseph Gregory Wiltshire
Lain-Jong Li
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Isis Innovation, Robin John Nicholas, Joseph Gregory Wiltshire, Lain-Jong Li filed Critical Isis Innovation
Publication of WO2005085131A2 publication Critical patent/WO2005085131A2/en
Publication of WO2005085131A3 publication Critical patent/WO2005085131A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/32—Magnetic separation acting on the medium containing the substance being separated, e.g. magneto-gravimetric-, magnetohydrostatic-, or magnetohydrodynamic separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • C01B32/168—After-treatment
    • C01B32/172—Sorting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/18—Magnetic separation whereby the particles are suspended in a liquid
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2202/00—Structure or properties of carbon nanotubes
    • C01B2202/02—Single-walled nanotubes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2202/00—Structure or properties of carbon nanotubes
    • C01B2202/20—Nanotubes characterized by their properties
    • C01B2202/22—Electronic properties
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2202/00—Structure or properties of carbon nanotubes
    • C01B2202/20—Nanotubes characterized by their properties
    • C01B2202/36—Diameter

Abstract

A method of sorting single-walled carbon nanotubes according to their physical structure by use of an inhomogeneous magnetic field. A mixture of single-walled carbon nanotubes in an aqueous surfactant suspension is positioned in a gradient magnetic field. Those nanotubes having metallic properties, and thus being paramagnetic, are attracted to regions of higher field while those having semiconducting properties, and thus being diamagnetic, are repelled to regions of lower field. Within the semiconducting nanotubes, a separation is also achieved according to their diameter upon which depends their diamagnetic susceptibility. The distribution can be adjusted by selecting the density of liquid used to suspend the nanotubes, for example by using heavy water so that the nanotubes move to a position where the net forces of gravity, buoyancy and the magnetic field, are in balance. A method of separating impurities, such as metallic catalyst particles, is also described in which a magnetic field is applied to a suspension of carbon nanotubes and the metallic particles are attracted towards the poles of the magnet allowing them to be removed.
PCT/GB2005/000822 2004-03-02 2005-03-02 Separation of carbon nanotubes WO2005085131A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0404713.0 2004-03-02
GBGB0404713.0A GB0404713D0 (en) 2004-03-02 2004-03-02 Separation of carbon nanotubes

Publications (2)

Publication Number Publication Date
WO2005085131A2 WO2005085131A2 (en) 2005-09-15
WO2005085131A3 true WO2005085131A3 (en) 2006-04-27

Family

ID=32088595

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/000822 WO2005085131A2 (en) 2004-03-02 2005-03-02 Separation of carbon nanotubes

Country Status (2)

Country Link
GB (1) GB0404713D0 (en)
WO (1) WO2005085131A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005043054A1 (en) * 2005-09-09 2007-03-15 Future Carbon Gmbh Dispersion and process for its preparation
FI121540B (en) 2006-03-08 2010-12-31 Canatu Oy A method for transferring high aspect ratio molecular structures
EP2167216B1 (en) * 2007-06-29 2012-05-02 The President and Fellows of Harvard College Density-based methods for separation of materials, monitoring of solid supported reactions and measuring densities of small liquid volumes and solids
US7514063B1 (en) 2008-02-08 2009-04-07 International Business Machines Corporation Method for the purification of semiconducting single walled carbon nanotubes
US9322804B2 (en) 2010-11-29 2016-04-26 President And Fellows Of Harvard College Quality control of diamagnetic materials using magnetic levitation
US20140166545A1 (en) * 2011-03-17 2014-06-19 Joseph W. Lyding Asymmetric magnetic field nanostructure separation method, device and system
NO345003B1 (en) 2018-05-31 2020-08-17 Bergen Carbon Solutions As Apparatus and method for purification of carbon nanomaterial

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030168385A1 (en) * 2001-12-20 2003-09-11 Fotios Papadimitrakopoulos Separation of single wall carbon nanotubes
WO2003084869A2 (en) * 2002-03-04 2003-10-16 William Marsh Rice University Method for separating single-wall carbon nanotubes and compositions thereof
WO2004015786A2 (en) * 2002-08-07 2004-02-19 Pieder Beeli Electrical and electro-mechanical applications of superconducting phenomena in carbon nanotubes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030168385A1 (en) * 2001-12-20 2003-09-11 Fotios Papadimitrakopoulos Separation of single wall carbon nanotubes
WO2003084869A2 (en) * 2002-03-04 2003-10-16 William Marsh Rice University Method for separating single-wall carbon nanotubes and compositions thereof
WO2004015786A2 (en) * 2002-08-07 2004-02-19 Pieder Beeli Electrical and electro-mechanical applications of superconducting phenomena in carbon nanotubes

Also Published As

Publication number Publication date
GB0404713D0 (en) 2004-04-07
WO2005085131A2 (en) 2005-09-15

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