Patents by Inventor Savka Stoeva

Savka Stoeva 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: 7244799
    Abstract: Novel siloxanes are provided in the form of nanoscale bodies having discrete, observable structures, such as elongated wires, tubes, filaments and coils, having a length of at least about 100 nm and a diameter of from about 2-200 nm. The siloxanes are synthesized by reacting a substituted silane in a solvent system comprising water and a polar organic solvent, and in the presence of a metallic nanoparticle catalyst such as gold.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: July 17, 2007
    Assignee: Kansas State University Research Foundation
    Inventors: Bhagavatula L. V. Prasad, Savka Stoeva, Kenneth J. Klabunde, Christopher Sorensen
  • Publication number: 20050272897
    Abstract: Novel siloxanes are provided in the form of nanoscale bodies having discrete, observable structures, such as elongated wires, tubes, filaments and coils, having a length of at least about 100 nm and a diameter of from about 2-200 nm. The siloxanes are synthesized by reacting a substituted silane in a solvent system comprising water and a polar organic solvent, and in the presence of a metallic nanoparticle catalyst such as gold.
    Type: Application
    Filed: July 9, 2004
    Publication date: December 8, 2005
    Inventors: B.L.V. Prasad, Savka Stoeva, Kenneth Klabunde, Christopher Sorensen
  • Publication number: 20030207949
    Abstract: A method of forming ligated nanoparticles of the formula Y(Z)x where Y is a nanoparticle selected from the group consisting of elemental metals having atomic numbers ranging from 21-34, 39-52, 57-83 and 89-102, all inclusive, the halides, oxides and sulfides of such metals, and the alkali metal and alkaline earth metal halides, and Z represents ligand moieties such as the alkyl thiols. In the method, a first colloidal dispersion is formed made up of nanoparticles solvated in a molar excess of a first solvent (preferably a ketone such as acetone), a second solvent different than the first solvent (preferably an organic aryl solvent such as toluene) and a quantity of ligand moieties; the first solvent is then removed under vacuum and the ligand moieties ligate to the nanoparticles to give a second colloidal dispersion of the ligated nanoparticles solvated in the second solvent. If substantially monodispersed nanoparticles are desired, the second dispersion is subjected to a digestive ripening process.
    Type: Application
    Filed: April 14, 2003
    Publication date: November 6, 2003
    Inventors: Kenneth J. Klabunde, Savka Stoeva, Christopher Sorensen
  • Publication number: 20030203977
    Abstract: A method of forming ligated nanoparticles of the formula Y(Z)x where Y is a nanoparticle selected from the group consisting of elemental metals having atomic numbers ranging from 21-34, 39-52, 57-83 and 89-102, all inclusive, the halides, oxides and sulfides of such metals, and the alkali metal and alkaline earth metal halides, and Z represents ligand moieties such as the alkyl thiols. In the method, a first colloidal dispersion is formed made up of nanoparticles solvated in a molar excess of a first solvent (preferably a ketone such as acetone), a second solvent different than the first solvent (preferably an organic aryl solvent such as toluene) and a quantity of ligand moieties; the first solvent is then removed under vacuum and the ligand moieties ligate to the nanoparticles to give a second colloidal dispersion of the ligated nanoparticles solvated in the second solvent. If substantially monodispersed nanoparticles are desired, the second dispersion is subjected to a digestive ripening process.
    Type: Application
    Filed: April 14, 2003
    Publication date: October 30, 2003
    Inventors: Kenneth J. Klabunde, Savka Stoeva, Christopher Sorensen
  • Patent number: 6562403
    Abstract: A method of forming ligated nanoparticles of the formula Y(Z)x where Y is a nanoparticle selected from the group consisting of elemental metals having atomic numbers ranging from 21-34, 39-52, 57-83 and 89-102, all inclusive, the halides, oxides and sulfides of such metals, and the alkali metal and alkaline earth metal halides, and Z represents ligand moieties such as the alkyl thiols. In the method, a first colloidal dispersion is formed made up of nanoparticles solvated in a molar excess of a first solvent (preferably a ketone such as acetone), a second solvent different than the first solvent (preferably an organic aryl solvent such as toluene) and a quantity of ligand moieties; the first solvent is then removed under vacuum and the ligand moieties ligate to the nanoparticles to give a second colloidal dispersion of the ligated nanoparticles solvated in the second solvent. If substantially monodispersed nanoparticles are desired, the second dispersion is subjected to a digestive ripening process.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: May 13, 2003
    Assignee: Kansas State University Research Foundation
    Inventors: Kenneth J. Klabunde, Savka Stoeva, Christopher Sorensen
  • Publication number: 20030072874
    Abstract: A method of forming ligated nanoparticles of the formula Y(Z)x, where Y is a nanoparticle selected from the group consisting of elemental metals having atomic numbers ranging from 21-34, 39-52, 57-83 and 89-102, all inclusive, the halides, oxides and sulfides of such metals, and the alkali metal and alkaline earth metal halides, and Z represents ligand moieties such as the alkyl thiols. In the method, a first colloidal dispersion is formed made up of nanoparticles solvated in a molar excess of a first solvent (preferably a ketone such as acetone), a second solvent different than the first solvent (preferably an organic aryl solvent such as toluene) and a quantity of ligand moieties; the first solvent is then removed under vacuum and the ligand moieties ligate to the nanoparticles to give a second colloidal dispersion of the ligated nanoparticles solvated in the second solvent. If substantially monodispersed nanoparticles are desired, the second dispersion is subjected to a digestive ripening process.
    Type: Application
    Filed: October 15, 2001
    Publication date: April 17, 2003
    Applicant: KANSAS STATE UNIVERSITY RESEARCH FOUNDATION
    Inventors: Kenneth J. Klabunde, Savka Stoeva, Christopher Sorensen