Patents by Inventor Julia Xiaojun Zhao
Julia Xiaojun Zhao 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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Patent number: 11718782Abstract: A compound for use in oil recovery includes a quantum dot and a zwitterionic surfactant. The quantum dot has a diameter no greater than 25 nm and the quantum dot is bonded to the zwitterionic surfactant. A nanofluid for use in oil recovery includes the compound described above and a fluid carrier. A method for recovering oil from a formation includes flooding the formation with a nanofluid. The nanofluid has a quantum dot diameter no greater than 25 nm bonded to a zwitterionic surfactant and a fluid carrier.Type: GrantFiled: December 31, 2020Date of Patent: August 8, 2023Assignee: University of North DakotaInventors: Yanxia Zhou, Xu Wu, Julia Xiaojun Zhao, Hui Pu
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Publication number: 20210269702Abstract: A compound for use in oil recovery includes a quantum dot and a zwitterionic surfactant. The quantum dot has a diameter no greater than 25 nm and the quantum dot is bonded to the zwitterionic surfactant. A nanofluid for use in oil recovery includes the compound described above and a fluid carrier. A method for recovering oil from a formation includes flooding the formation with a nanofluid. The nanofluid has a quantum dot diameter no greater than 25 nm bonded to a zwitterionic surfactant and a fluid carrier.Type: ApplicationFiled: December 31, 2020Publication date: September 2, 2021Inventors: Yanxia Zhou, Xu Wu, Julia Xiaojun Zhao, Hui Pu
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Publication number: 20210214678Abstract: A method of making a porous three-dimensional graphene mesh includes combining a graphene-containing material and a polymer having a plurality of hydroxyl groups in an alcohol solvent to form a mixture, adding a salt to the mixture, heating the mixture to form a gel, and washing the gel with water to remove the salt from the gel, leaving behind stable pores to form a scaffold. A three-dimensional porous graphene mesh includes a graphene-containing material and a polymer. The polymer is crosslinked with the graphene-containing material such that the Young's Modulus of the mesh is at least about 5 GPa.Type: ApplicationFiled: March 26, 2021Publication date: July 15, 2021Applicant: University of North DakotaInventors: Ying Zhang, Julia Xiaojun Zhao, Diane Darland
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Patent number: 10988732Abstract: A method of making a porous three-dimensional graphene mesh includes combining a graphene-containing material and a polymer having a plurality of hydroxyl groups in an alcohol solvent to form a mixture, adding a salt to the mixture, heating the mixture to form a gel, and washing the gel with water to remove the salt from the gel, leaving behind stable pores to form a scaffold. A three-dimensional porous graphene mesh includes a graphene-containing material and a polymer. The polymer is crosslinked with the graphene-containing material such that the Young's Modulus of the mesh is at least about 5 GPa.Type: GrantFiled: January 28, 2020Date of Patent: April 27, 2021Assignee: University of North DakotaInventors: Ying Zhang, Julia Xiaojun Zhao, Diane Darland
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Patent number: 10808220Abstract: A method of making a porous three-dimensional graphene mesh includes combining a graphene-containing material and a polymer having a plurality of hydroxyl groups in an alcohol solvent to form a mixture, adding a salt to the mixture, heating the mixture to form a gel, and washing the gel with water to remove the salt from the gel, leaving behind stable pores to form a scaffold. A three-dimensional porous graphene mesh includes a graphene-containing material and a polymer. The polymer is crosslinked with the graphene-containing material such that the Young's Modulus of the mesh is at least about 5 GPa.Type: GrantFiled: March 9, 2018Date of Patent: October 20, 2020Assignee: University of North DakotaInventors: Ying Zhang, Julia Xiaojun Zhao, Diane Darland
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Publication number: 20200248135Abstract: A method of making a porous three-dimensional graphene mesh includes combining a graphene-containing material and a polymer having a plurality of hydroxyl groups in an alcohol solvent to form a mixture, adding a salt to the mixture, heating the mixture to form a gel, and washing the gel with water to remove the salt from the gel, leaving behind stable pores to form a scaffold. A three-dimensional porous graphene mesh includes a graphene-containing material and a polymer. The polymer is crosslinked with the graphene-containing material such that the Young's Modulus of the mesh is at least about 5 GPa.Type: ApplicationFiled: January 28, 2020Publication date: August 6, 2020Applicant: University of North DakotaInventors: Ying Zhang, Julia Xiaojun Zhao, Diane Darland
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Publication number: 20180265840Abstract: A method of making a porous three-dimensional graphene mesh includes combining a graphene-containing material and a polymer having a plurality of hydroxyl groups in an alcohol solvent to form a mixture, adding a salt to the mixture, heating the mixture to form a gel, and washing the gel with water to remove the salt from the gel, leaving behind stable pores to form a scaffold. A three-dimensional porous graphene mesh includes a graphene-containing material and a polymer. The polymer is crosslinked with the graphene-containing material such that the Young's Modulus of the mesh is at least about 5 GPa.Type: ApplicationFiled: March 9, 2018Publication date: September 20, 2018Inventors: Ying Zhang, Julia Xiaojun Zhao, Diane Darland
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Patent number: 9637443Abstract: A method for forming a graphene quantum dot product includes adding an organic starting material to a vessel and heating the organic starting material to a temperature within 20° C. of the organic starting material's boiling temperature for a time no longer than ten minutes to form graphene quantum dots. A method for sensing a graphene quantum dot includes forming a graphene quantum dot, exciting the graphene quantum dot with light having a first wavelength, measuring light emitted by the excited graphene quantum dot at a second wavelength different from the first wavelength. A graphene quantum dot includes carbon atoms and nitrogen atoms where the nitrogen atoms are present within the graphene quantum dot at a level between 6.0% and 11.0% of a level of carbon atoms present in the graphene quantum dot.Type: GrantFiled: April 25, 2014Date of Patent: May 2, 2017Assignee: University of North DakotaInventors: Julia Xiaojun Zhao, Xu Wu
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Publication number: 20150284318Abstract: A method for forming a graphene quantum dot product includes adding an organic starting material to a vessel and heating the organic starting material to a temperature within 20° C. of the organic starting material's boiling temperature for a time no longer than ten minutes to form graphene quantum dots. A method for sensing a graphene quantum dot includes forming a graphene quantum dot, exciting the graphene quantum dot with light having a first wavelength, measuring light emitted by the excited graphene quantum dot at a second wavelength different from the first wavelength. A graphene quantum dot includes carbon atoms and nitrogen atoms where the nitrogen atoms are present within the graphene quantum dot at a level between 6.0% and 11.0% of a level of carbon atoms present in the graphene quantum dot.Type: ApplicationFiled: April 25, 2014Publication date: October 8, 2015Inventors: Julia Xiaojun Zhao, Xu Wu
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Patent number: 9139443Abstract: One embodiment of the present invention is a hollow silica nanomaterial (HSN). The HSN includes silicon dioxide (SiO2) molecules which join together to form a shell. The shell extends from a first end to a second end and has a generally circular cross section, an inner surface and an opposite outer surface. Another embodiment of the present invention includes a method for forming an HSN. The method includes combining polyvinylpyrrolidone (PVP) and an alcohol to form a mixture, adding water to the mixture, adding sodium citrate to the mixture, adding a silicon-containing compound to the mixture, adding a catalyst to the mixture, and collecting hollow silica nanomaterials.Type: GrantFiled: August 27, 2013Date of Patent: September 22, 2015Assignee: University of North DakoaInventors: Julia Xiaojun Zhao, Jiao Chen
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Publication number: 20150064467Abstract: One embodiment of the present invention is a hollow silica nanomaterial (HSN). The HSN includes silicon dioxide (SiO2) molecules which join together to form a shell. The shell extends from a first end to a second end and has a generally circular cross section, an inner surface and an opposite outer surface. Another embodiment of the present invention includes a method for forming an HSN. The method includes combining polyvinylpyrrolidone (PVP) and an alcohol to form a mixture, adding water to the mixture, adding sodium citrate to the mixture, adding a silicon-containing compound to the mixture, adding a catalyst to the mixture, and collecting hollow silica nanomaterials.Type: ApplicationFiled: August 27, 2013Publication date: March 5, 2015Inventors: Julia Xiaojun Zhao, Jiao Chen
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Patent number: 8183300Abstract: A method for producing nanoparticles of a selected size includes selecting an organic solvent based upon a molar volume of the organic solvent, the selected nanoparticle size, and a known relationship between the molar volume and the selected nanoparticle size, and producing nanoparticles having the selected size in a water-in-oil microemulsion comprising the selected organic solvent.Type: GrantFiled: February 11, 2009Date of Patent: May 22, 2012Assignee: University of North DakotaInventors: Julia Xiaojun Zhao, Yuhui Jin
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Publication number: 20100140548Abstract: A nanoaggregate composition and method for making nanoaggregate compositions constructed with one, two, and three nanoparticle building blocks includes coating the building blocks with a concentration of polyvinylpyrrolidone (PVP) molecules based on a known relationship between the concentration and an extent of aggregation of the building blocks, and producing nanoaggregates from the building blocks comprising a mixture of single-core nanoaggregates, double-core nanoaggregates, and triple-core nanoaggregates as a function of the extent of aggregation.Type: ApplicationFiled: February 11, 2009Publication date: June 10, 2010Inventors: Julia Xiaojun Zhao, Shuping Xu
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Publication number: 20090258956Abstract: A method for producing nanoparticles of a selected size includes selecting an organic solvent based upon a molar volume of the organic solvent, the selected nanoparticle size, and a known relationship between the molar volume and the selected nanoparticle size, and producing nanoparticles having the selected size in a water-in-oil microemulsion comprising the selected organic solvent.Type: ApplicationFiled: February 11, 2009Publication date: October 15, 2009Inventors: Julia Xiaojun Zhao, Yuhui Jin