Patents by Inventor Chase T. Ellis

Chase T. Ellis 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).

  • Core/shell nanocrystals with copper sulfide cores and lead sulfide shells
    Patent number: 11732186
    Abstract: A process for synthesizing Cu2-xS/PbS core/shell nanocrystals. Pb-oleate is mixed with 1-octadecene and heated to 60° C. Cu2-xS core solution and bis(trimethylsilyl)sulfide stock solution are added and the mixture is stirred at 60° C. for 6 minutes to form the PbS shell around the Cu2-xS nanocrystal cores. The flask is cooled and acetonitrile and toluene is added and the mixture is centrifuged to precipitate and remove the Cu2-xS/PbS core/shell nanocrystals from the reaction mixture. The reaction also produces homogeneously nucleated PbS nanocrystals, which are removed from the Cu2-xS/PbS core/shell reaction mixture via size-selective precipitation. By tailoring the amounts of Pb-oleate and bis(trimethylsilyl)sulfide stock solution in the reaction vessel, while maintaining their molar ratio of 1.5:1 and the number of Cu2-xS cores in the reaction, Cu2-xS/PbS core/shell nanocrystals having a predetermined shell thickness of PbS, and thus a predetermined level of chemical stability, can be obtained.
    Type: Grant
    Filed: April 23, 2021
    Date of Patent: August 22, 2023
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Janice E. Boercker, Sarah F. Brittman, Joseph G. Tischler, Patrick Y. Yee, Chase T. Ellis, Paul D. Cunningham, Rhonda M. Stroud, Michael H. Stewart, Steven C. Erwin
  • Cu2-xS/PbS Core/Shell Nanocrystals
    Publication number: 20210332291
    Abstract: A process for synthesizing Cu2-xS/PbS core/shell nanocrystals. Pb-oleate is mixed with 1-octadecene and heated to 60° C. Cu2-xS core solution and bis(trimethylsilyl)sulfide stock solution are added and the mixture is stirred at 60° C. for 6 minutes to form the PbS shell around the Cu2-xS nanocrystal cores. The flask is cooled and acetonitrile and toluene is added and the mixture is centrifuged to precipitate and remove the Cu2-xS/PbS core/shell nanocrystals from the reaction mixture. The reaction also produces homogeneously nucleated PbS nanocrystals, which are removed from the Cu2-xS/PbS core/shell reaction mixture via size-selective precipitation. By tailoring the amounts of Pb-oleate and bis(trimethylsilyl)sulfide stock solution in the reaction vessel, while maintaining their molar ratio of 1.5:1 and the number of Cu2-xS cores in the reaction, Cu2-xS/PbS core/shell nanocrystals having a predetermined shell thickness of PbS, and thus a predetermined level of chemical stability, can be obtained.
    Type: Application
    Filed: April 23, 2021
    Publication date: October 28, 2021
    Applicant: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Janice E. Boercker, Sarah F. Brittman, Joseph G. Tischler, Patrick Y. Yee, Chase T. Ellis, Paul D. Cunningham, Rhonda M. Stroud, Michael H. Stewart, Steven C. Erwin