Patents by Inventor Dajie Zhang
Dajie 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).
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Publication number: 20230299279Abstract: Processes for preparing a niobate material are provided, in which the processes include the following steps: (i) providing a niobium-containing source; (ii) providing a transitional metal source (TMS), a post-transitional metal source (PTMS), or both; (iii) dissolving (a) the niobium-containing source, and (b) the TMS, the PTMS, or both in an aqueous medium to form an intermediate solution; (iv) forming an intermediate paste by admixing an inert support material with the intermediate solution; (v) optionally coating the intermediate paste on a support substrate; and (vi) removing the inert support material by subjecting the intermediate paste to a calcination process and providing a transition-metal-niobate (TMN) and/or a post-transition-metal-niobate (PTMN). Anodes including a TMN and/or PTMN are also provided.Type: ApplicationFiled: April 28, 2023Publication date: September 21, 2023Inventors: Konstantinos Gerasopoulos, Dajie Zhang, Matthew W. Logan
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Publication number: 20230282818Abstract: Processes for preparing a niobate material are provided, in which the processes include the following steps: (i) providing a niobium-containing source; (ii) providing a transitional metal source (TMS), a post-transitional metal source (PTMS), or both; (iii) dissolving (a) the niobium-containing source, and (b) the TMS, the PTMS, or both in an aqueous medium to form an intermediate solution; (iv) forming an intermediate paste by admixing an inert support material with the intermediate solution; (v) optionally coating the intermediate paste on a support substrate; and (vi) removing the inert support material by subjecting the intermediate paste to a calcination process and providing a transition-metal-niobate (TMN) and/or a post-transition-metal-niobate (PTMN). Anodes including a TMN and/or PTMN are also provided.Type: ApplicationFiled: April 28, 2023Publication date: September 7, 2023Inventors: Konstantinos Gerasopoulos, Dajie Zhang, Matthew W. Logan
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Patent number: 11682760Abstract: Processes for preparing a niobate material include the following steps: (i) providing a niobium-containing source; (ii) providing a transitional metal source (TMS), a post-transitional metal source (PTMS), or both; (iii) dissolving (a) the niobium-containing source, and (b) the TMS, the PTMS, or both in an aqueous medium to form an intermediate solution; (iv) forming an intermediate paste by admixing an inert support material with the intermediate solution; (v) optionally coating the intermediate paste on a support substrate; and (vi) removing the inert support material by subjecting the intermediate paste to a calcination process and providing a transition-metal-niobate (TMN) and/or a post-transition-metal-niobate (PTMN). Anodes including a TMN and/or PTMN are also provided.Type: GrantFiled: June 14, 2021Date of Patent: June 20, 2023Assignee: The Johns Hopkins UniversityInventors: Konstantinos Gerasopoulos, Dajie Zhang, Matthew W. Logan
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Publication number: 20230050837Abstract: The present invention is directed to methods for formation of refractory carbide, nitride, and boride coatings without use of a binding agent. The present invention is directed to methods of creating refractory coatings with controlled porosity. Refractory coatings can be formed from refractory metal, metal oxide, or metal/metal oxide composite refractory coating precursor of the 9 refractory metals encompassed by groups 4-6 and periods 4-6 of the periodic table; non-metallic elements (e.g. Si & B) and their oxides (i.e. SiO2 & B2O3) are also pertinent. The conversion of the refractory coating precursor to refractory carbide, nitride or boride is achieved via carburization, nitridization, or boridization in the presence of carbon-containing (e.g. CH4), nitrogen containing (e.g. NH3), and boron-containing (e.g. B2H6) gaseous species. Any known technique of applying the refractory coating precursor can be used.Type: ApplicationFiled: August 23, 2022Publication date: February 16, 2023Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Michael BRUPBACHER, Dajie ZHANG, Dennis NAGLE
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Publication number: 20230001251Abstract: A contaminant-sequestering coating includes a network of hydrolyzed silane compounds. The hydrolyzed silane compounds include a hydrophilic polar head region, a hydrophobic linker, and an anchor region including a silicon atom. The network of hydrolyzed silane compounds is devoid or substantially devoid of fluorine atoms. Methods of destroying one or more perfluoroalkyl and/or polyfluoroalkyl (PFAS) compounds present in a contaminant-containing liquid are also provided.Type: ApplicationFiled: June 15, 2022Publication date: January 5, 2023Inventors: Zhiyong Xia, James K. Johnson, Jesse S. Ko, Nam Q. Le, Danielle R. Schlesinger, Dajie Zhang, Plamen A. Demirev
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Publication number: 20220324758Abstract: A composite precursor powder, including one or more metals or metalloids, and one or more oxides, wherein a molar ratio of the one or more metals or metalloids to the one or more oxides is from about 1:0.01 to about 1:4, and wherein the molar ratio of the one or more metals or metalloids to the one or more oxides is configured according to a desired volumetric change of the composite precursor powder when converted to a non-oxide ceramic.Type: ApplicationFiled: October 1, 2020Publication date: October 13, 2022Inventors: Adam B. PETERS, Michael C. BRUPBACHER, Dajie ZHANG, Dennis NAGLE
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Publication number: 20220052329Abstract: Processes for preparing a niobate material include the following steps: (i) providing a niobium-containing source; (ii) providing a transitional metal source (TMS), a post-transitional metal source (PTMS), or both; (iii) dissolving (a) the niobium-containing source, and (b) the TMS, the PTMS, or both in an aqueous medium to form an intermediate solution; (iv) forming an intermediate paste by admixing an inert support material with the intermediate solution; (v) optionally coating the intermediate paste on a support substrate; and (vi) removing the inert support material by subjecting the intermediate paste to a calcination process and providing a transition-metal-niobate (TMN) and/or a post-transition-metal-niobate (PTMN). Anodes including a TMN and/or PTMN are also provided.Type: ApplicationFiled: June 14, 2021Publication date: February 17, 2022Inventors: Konstantinos Gerasopoulos, Dajie Zhang, Matthew W. Logan
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Publication number: 20170335442Abstract: The present invention is directed to methods for formation of refractory carbide, nitride, and boride coatings without use of a binding agent. The present invention is directed to methods of creating refractory coatings with controlled porosity. Refractory coatings can be formed from refractory metal, metal oxide, or metal/metal oxide composite refractory coating precursor of the 9 refractory metals encompassed by groups 4-6 and periods 4-6 of the periodic table; non-metallic elements (e.g. Si & B) and their oxides (i.e. SiO2 & B2O3) are also pertinent. The conversion of the refractory coating precursor to refractory carbide, nitride or boride is achieved via carburization, nitridization, or boridization in the presence of carbon-containing (e.g. CH4), nitrogen containing (e.g. NH3), and boron-containing (e.g. B2H6) gaseous species. Any known technique of applying the refractory coating precursor can be used.Type: ApplicationFiled: November 6, 2015Publication date: November 23, 2017Inventors: Michael Brupbacher, Dajie Zhang, Dennis Nagle
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Patent number: 9822017Abstract: 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: GrantFiled: May 11, 2016Date of Patent: November 21, 2017Assignee: The United States of America as Represented by the Secretary of the ArmyInventors: Dajie Zhang, Brendan S. DeLacy, Zachary B Zander
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Patent number: 9162514Abstract: 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: GrantFiled: October 22, 2014Date of Patent: October 20, 2015Assignee: The Johns Hopkins UniversityInventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
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Publication number: 20150283846Abstract: 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: ApplicationFiled: October 22, 2014Publication date: October 8, 2015Inventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
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Patent number: 8895158Abstract: 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: GrantFiled: August 3, 2012Date of Patent: November 25, 2014Assignee: The Johns Hopkins UniversityInventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
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Publication number: 20140302255Abstract: 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: ApplicationFiled: April 5, 2013Publication date: October 9, 2014Inventors: James B. Spicer, Travis J. DeJournett, Dajie Zhang
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Patent number: 8632744Abstract: 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: GrantFiled: June 29, 2011Date of Patent: January 21, 2014Assignee: University of Maine System Board of TrusteesInventors: Barry S. Goodell, Xinfeng Xie, Yuhui Qian, Dajie Zhang, Michael L. Peterson, Jody L. Jellison
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Publication number: 20130040150Abstract: 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: ApplicationFiled: August 3, 2012Publication date: February 14, 2013Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Morgana M. Trexler, Dajie Zhang, Lisa A. Kelly, Jennifer L. Sample, John M. Brupbacher
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Patent number: 8080227Abstract: 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: GrantFiled: January 31, 2008Date of Patent: December 20, 2011Assignee: University of MaineInventors: Barry S. Goodell, Xinfeng Xie, Yuhui Qian, Dajie Zhang, Michael L. Peterson, Jody L. Jellison
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Publication number: 20110256401Abstract: 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: ApplicationFiled: June 29, 2011Publication date: October 20, 2011Inventors: Barry S. Goodell, Xinfeng Xie, Yuhui Qian, Dajie Zhang, Michael L. Peterson, Jody L. Jellison
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Patent number: 6045925Abstract: 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: GrantFiled: August 5, 1997Date of Patent: April 4, 2000Assignee: Kansas State University Research FoundationInventors: Kenneth J. Klabunde, Dajie Zhang, Christopher Sorensen