Patents by Inventor Daji ZHANG

Daji 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).

  • Patent number: 9822017
    Abstract: The present invention relates to a process for preparing high aspect ratio titanium dioxide (TiO2) nanorods using a one-pot hydrothermal technique. Reaction additives of oxalic acid and sodium hydroxide (NaOH) are used to promote the conversion of titanium dioxide precursors, preferably tetraisopropoxide (TTIP), into a one-dimensional TiO2 morphology.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: November 21, 2017
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Dajie Zhang, Brendan S. DeLacy, Zachary B Zander
  • Patent number: 9162514
    Abstract: A method includes producing an article having a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: October 20, 2015
    Assignee: The Johns Hopkins University
    Inventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
  • Publication number: 20150283846
    Abstract: A method includes producing an article having a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.
    Type: Application
    Filed: October 22, 2014
    Publication date: October 8, 2015
    Inventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
  • Patent number: 8895158
    Abstract: An article includes a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: November 25, 2014
    Assignee: The Johns Hopkins University
    Inventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
  • Publication number: 20140302255
    Abstract: Using a modified CVD infusion process and femtosecond laser irradiation, the methods of the present invention demonstrate the ability to create core-shell nanoparticles of metal and metal oxide nanoparticles embedded within the bulk of an optically transparent substrate. Changes in the optical properties and changes in the structure, size, and shape of the nanoparticles were observed as a result of the methods. It was also observed that core-shell nanoparticles made using the inventive methods preferentially nucleated in the near surface region of the substrate, indicating a precursor-diffusion-dependent process for the nucleation growth of core-shell nanoparticles. With the use of optical masks and multiple precursor chemicals, the inventive methods make it possible to create nanoparticles or core-shell nanoparticles with drastically different compositions in close proximity to each other.
    Type: Application
    Filed: April 5, 2013
    Publication date: October 9, 2014
    Inventors: James B. Spicer, Travis J. DeJournett, Dajie Zhang
  • Patent number: 8632744
    Abstract: A process of producing a composite having carbon nanotubes is described where the carbon nanotube formation process of producing carbon nanotubes includes controlled heating of plant fiber materials in an oxygen-limited atmosphere. The plant fiber materials may be heated either cyclically or by rapid heating to produce the carbon nanotubes.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: January 21, 2014
    Assignee: University of Maine System Board of Trustees
    Inventors: Barry S. Goodell, Xinfeng Xie, Yuhui Qian, Dajie Zhang, Michael L. Peterson, Jody L. Jellison
  • Publication number: 20130040150
    Abstract: An article includes a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.
    Type: Application
    Filed: August 3, 2012
    Publication date: February 14, 2013
    Applicant: THE JOHNS HOPKINS UNIVERSITY
    Inventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
  • Patent number: 8080227
    Abstract: A carbon nanotube formation process of producing carbon nanotubes includes controlled heating of plant fiber materials in an oxygen-limited atmosphere. The plant fiber materials may be heated either cyclically or by rapid heating to produce the carbon nanotubes.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: December 20, 2011
    Assignee: University of Maine
    Inventors: Barry S. Goodell, Xinfeng Xie, Yuhui Qian, Dajie Zhang, Michael L. Peterson, Jody L. Jellison
  • Publication number: 20110256401
    Abstract: A process of producing a composite having carbon nanotubes is described where the carbon nanotube formation process of producing carbon nanotubes includes controlled heating of plant fiber materials in an oxygen-limited atmosphere. The plant fiber materials may be heated either cyclically or by rapid heating to produce the carbon nanotubes.
    Type: Application
    Filed: June 29, 2011
    Publication date: October 20, 2011
    Inventors: Barry S. Goodell, Xinfeng Xie, Yuhui Qian, Dajie Zhang, Michael L. Peterson, Jody L. Jellison
  • Patent number: 6045925
    Abstract: Composite nanoparticles comprising an elemental metal core surrounded by a metal-containing shell material are described wherein the particles have an average diameter of from about 5-500 nm; the core metal is preferably selected from the group consisting of the transition metals and especially Fe, Co and Ni, whereas the shell material is advantageously a metal such as an alkaline earth metal, or a metal salt such as a metal oxide or metal halide. The shell material is preferably more oxophilic than the elemental core material, enabling the core metal to remain purely metallic. These core/shell composite particles can be used to fabricate magnetizable recording media such as tapes and disks.
    Type: Grant
    Filed: August 5, 1997
    Date of Patent: April 4, 2000
    Assignee: Kansas State University Research Foundation
    Inventors: Kenneth J. Klabunde, Dajie Zhang, Christopher Sorensen