Patents by Inventor Xiefei Zhang

Xiefei Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Increasing the specific strength of spun carbon nanotube fibers
    Patent number: 9315385
    Abstract: A spun fiber of carbon nanotubes is exposed to ion irradiation. The irradiation exposure increases the specific strength of the spun fiber.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: April 19, 2016
    Assignee: Los Alamos National Security, LLC
    Inventors: Paul N. Arendt, Yuntian T. Zhu, Igor O. Usov, Xiefei Zhang
  • Carbon nanotube fiber spun from wetted ribbon
    Patent number: 8709372
    Abstract: A fiber of carbon nanotubes was prepared by a wet-spinning method involving drawing carbon nanotubes away from a substantially aligned, supported array of carbon nanotubes to form a ribbon, wetting the ribbon with a liquid, and spinning a fiber from the wetted ribbon. The liquid can be a polymer solution and after forming the fiber, the polymer can be cured. The resulting fiber has a higher tensile strength and higher conductivity compared to dry-spun fibers and to wet-spun fibers prepared by other methods.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: April 29, 2014
    Assignee: Los Alamos National Security, LLC
    Inventors: Yuntian T. Zhu, Paul Arendt, Xiefei Zhang, Qingwen Li, Lei Fu, Lianxi Zheng
  • Increasing the specific strength of spun carbon nanotube fibers
    Publication number: 20100284896
    Abstract: A spun fiber of carbon nanotubes is exposed to ion irradiation. The irradiation exposure increases the specific strength of the spun fiber.
    Type: Application
    Filed: December 17, 2007
    Publication date: November 11, 2010
    Inventors: Paul N. Arendt, Yuntian T. Zhu, Igor O. Usov, Xiefei Zhang
  • Carbon nanotube fiber spun from wetted ribbon
    Publication number: 20090208742
    Abstract: A fiber of carbon nanotubes was prepared by a wet-spinning method involving drawing carbon nanotubes away from a substantially aligned, supported array of carbon nanotubes to form a ribbon, wetting the ribbon with a liquid, and spinning a fiber from the wetted ribbon. The liquid can be a polymer solution and after forming the fiber, the polymer can be cured. The resulting fiber has a higher tensile strength and higher conductivity compared to dry-spun fibers and to wet-spun fibers prepared by other methods.
    Type: Application
    Filed: October 2, 2008
    Publication date: August 20, 2009
    Inventors: Yuntian T. Zhu, Paul Arendt, Xiefei Zhang, Qingwen Li, Lei Fu, Lianxi Zheng
  • High tensile strength carbon nanotube film and process for making the same
    Publication number: 20060029537
    Abstract: A conductive carbon nanotube film having high tensile strength and initial tensile modulus comprises primarily oxidized small-diameter carbon nanotubes wherein the diameter of the small-diameter carbon nanotubes are at most about 3 nm. A method for making the film comprises refluxing an aqueous mixture comprising carbon nanotubes and an oxidizing agent to form a refluxed nanotube dispersion; forming a carbon nanotube film from the refluxed carbon nanotube dispersion; optionally removing nitric acid or other oxidizing agent from the carbon nanotube film; drying the carbon nanotube film; and heat-treating the carbon nanotube film to form a heat-treated carbon nanotube film. The method can also comprise sonicating the nanotubes prior to or after refluxing. A heat-treated small-diameter carbon nanotube film can have a tensile strength of over 70 MPa and an initial tensile modulus of about 5 GPa.
    Type: Application
    Filed: November 9, 2004
    Publication date: February 9, 2006
    Inventors: Xiefei Zhang, Sreekumar Veedu, Tao Liu, Satish Kumar