Patents by Inventor Daiwon Choi

Daiwon Choi 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).

  • Publication number: 20120107213
    Abstract: Methods of the present invention can be used to synthesize nanowires with controllable compositions and/or with multiple elements. The methods can include coating solid powder granules, which comprise a first element, with a catalyst. The catalyst and the first element should form when heated a liquid, mixed phase having a eutectic or peritectic point. The granules, which have been coated with the catalyst, can then be heated to a temperature greater than or equal to the eutectic or peritectic point. During heating, a vapor source comprising the second element is introduced. The vapor source chemically interacts with the liquid, mixed phase to consume the first element and to induce condensation of a product that comprises the first and second elements in the form of a nanowire.
    Type: Application
    Filed: December 28, 2011
    Publication date: May 3, 2012
    Applicant: BATTELLE MEMORIAL INSTITUTE
    Inventors: Jiguang Zhang, Jun Liu, Zhenguo Yang, Guanguang Xia, Leonard S. Fifield, Donghai Wang, Daiwon Choi, Gordon L. Graff, Larry R. Pederson
  • Publication number: 20120088158
    Abstract: A method for forming a nanocomposite material, the nanocomposite material formed thereby, and a battery made using the nanocomposite material. Metal oxide and graphene are placed in a solvent to form a suspension. The suspension is then applied to a current collector. The solvent is then evaporated to form a nanocomposite material. The nanocomposite material is then electrochemically cycled to form a nanocomposite material of at least one metal oxide in electrical communication with at least one graphene layer.
    Type: Application
    Filed: October 9, 2010
    Publication date: April 12, 2012
    Inventors: Jun Liu, Daiwon Choi, Wendy D. Bennett, Gordon L. Graff, Yongsoon Shin
  • Patent number: 8110167
    Abstract: Methods of the present invention can be used to synthesize nanowires with controllable compositions and/or with multiple elements. The methods can include coating solid powder granules, which comprise a first element, with a catalyst. The catalyst and the first element should form when heated a liquid, mixed phase having a eutectic or peritectic point. The granules, which have been coated with the catalyst, can then be heated to a temperature greater than or equal to the eutectic or peritectic point. During heating, a vapor source comprising the second element is introduced. The vapor source chemically interacts with the liquid, mixed phase to consume the first element and to induce condensation of a product that comprises the first and second elements in the form of a nanowire.
    Type: Grant
    Filed: February 10, 2009
    Date of Patent: February 7, 2012
    Assignee: Battelle Memorial Institute
    Inventors: Jiguang Zhang, Jun Liu, Zhenguo Yang, Guanguang Xia, Leonard S Fifield, Donghai Wang, Daiwon Choi, Gordon Graff, Larry R Pederson
  • Publication number: 20110111299
    Abstract: Lithium ion batteries having an anode comprising at least one graphene layer in electrical communication with titania to form a nanocomposite material, a cathode comprising a lithium olivine structure, and an electrolyte. The graphene layer has a carbon to oxygen ratio of between 15 to 1 and 500 to 1 and a surface area of between 400 and 2630 m2/g. The nanocomposite material has a specific capacity at least twice that of a titania material without graphene material at a charge/discharge rate greater than about 10 C. The olivine structure of the cathode of the lithium ion battery of the present invention is LiMPO4 where M is selected from the group consisting of Fe, Mn, Co, Ni and combinations thereof.
    Type: Application
    Filed: October 9, 2010
    Publication date: May 12, 2011
    Inventors: Jun Liu, Daiwon Choi, Zhenguo Yang, Donghai Wang, Gordon L. Graff, Zimin Nie, Vilayanur V. Viswanathan, Jason Zhang, Wu Xu, Jin Yong Kim
  • Publication number: 20110045347
    Abstract: Nanocomposite materials having at least two layers, each layer consisting of one metal oxide bonded to at least one graphene layer were developed. The nanocomposite materials will typically have many alternating layers of metal oxides and graphene layers, bonded in a sandwich type construction and will be incorporated into an electrochemical or energy storage device.
    Type: Application
    Filed: August 9, 2010
    Publication date: February 24, 2011
    Inventors: Jun Liu, Daiwon Choi, Rong Kou, Zimin Nie, Donghai Wang, Zhenguo Yang
  • Publication number: 20110033746
    Abstract: Nanocomposite materials having at least two layers, each layer consisting of one metal oxide bonded to at least one graphene layer were developed. The nanocomposite materials will typically have many alternating layers of metal oxides and graphene layers, bonded in a sandwich type construction and will be incorporated into an electrochemical or energy storage device.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 10, 2011
    Inventors: Jun Liu, Ilhan A. Aksay, Daiwon Choi, Rong Kou, Zimin Nie, Donghai Wang, Zhenguo Yang
  • Publication number: 20100202952
    Abstract: Methods of the present invention can be used to synthesize nanowires with controllable compositions and/or with multiple elements. The methods can include coating solid powder granules, which comprise a first element, with a catalyst. The catalyst and the first element should form when heated a liquid, mixed phase having a eutectic or peritectic point. The granules, which have been coated with the catalyst, can then be heated to a temperature greater than or equal to the eutectic or peritectic point. During heating, a vapor source comprising the second element is introduced. The vapor source chemically interacts with the liquid, mixed phase to consume the first element and to induce condensation of a product that comprises the first and second elements in the form of a nanowire.
    Type: Application
    Filed: February 10, 2009
    Publication date: August 12, 2010
    Applicant: BATTELLE MEMORIAL INSTITUTE
    Inventors: Jiguang Zhang, Jun Liu, Zhenguo Yang, Guanguang Xia, Leonard S. Fifield, Donghai Wang, Daiwon Choi, Gordon L. Graff, Larry R. Pederson
  • Publication number: 20100081057
    Abstract: Nanocomposite materials comprising a metal oxide bonded to at least one graphene material. The nanocomposite materials exhibit a specific capacity of at least twice that of the metal oxide material without the graphene at a charge/discharge rate greater than about 10C.
    Type: Application
    Filed: July 27, 2009
    Publication date: April 1, 2010
    Inventors: Jun Liu, Ilhan A. Aksay, Daiwon Choi, Donghai Wang, Zhenguo Yang
  • Publication number: 20090302269
    Abstract: New methods and compositions are disclosed that minimize foaming in hydrogen-releasing materials. Foaming can be minimized during release of hydrogen in composites that include structured forms such as wafers and discs. Change tolerances of from 0% to 25% in solid products described show promise for next-generation fuel elements and devices.
    Type: Application
    Filed: June 2, 2009
    Publication date: December 10, 2009
    Applicant: BATTELLE MEMORIAL INSTITUTE
    Inventors: Daiwon Choi, Abhijeet J. Karkamkar, S. Thomas Autrey, Christopher L. Aardahl
  • Patent number: 7247288
    Abstract: Provided is a method for production of nanocrystalline hydroxyapatite particles, and nanocrystalline hydroxyapatite particles produced according to the method. The nanocrystalline hydroxyapatite particles exhibit substantially superior cell transformation abilities as compared to known and commercially-available calcium phosphate kits. The nanocrystalline hydroxyapatite particles also find use in tissue engineering applications, for example bone and tooth engineering and repair applications.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: July 24, 2007
    Assignee: Carnegie Mellon University
    Inventors: Prashant N. Kumta, Charles Sfeir, Jeffrey Hollinger, Daiwon Choi, Lee Weiss, Phil Campbell
  • Publication number: 20030219466
    Abstract: Provided is a method for production of nanocrystalline hydroxyapatite particles, and nanocrystalline hydroxyapatite particles produced according to the method. The nanocrystalline hydroxyapatite particles exhibit substantially superior cell transformation abilities as compared to known and commercially-available calcium phosphate kits. The nanocrystalline hydroxyapatite particles also find use in tissue engineering applications, for example bone and tooth engineering and repair applications.
    Type: Application
    Filed: March 19, 2003
    Publication date: November 27, 2003
    Inventors: Prashant N. Kumta, Charles S. Sfeir, Jeffrey O. Hollinger, Daiwon Choi, Lee Weiss, Phil Campbell