Patents by Inventor Sundaram Gunasekaran

Sundaram Gunasekaran 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: 11091844
    Abstract: A method to make free-standing graphene sheets and the free-standing graphene sheets so formed. The method includes the steps of exfoliating partially oxidized graphene from a carbon-containing electrode into an aqueous solution, acidifying the aqueous solution, and separating from the acidified solution partially oxidized graphene sheet. The partially oxidized graphene is then dried to yield free-standing graphene sheet having a carbon-to-oxygen ratio of at least about 8.0.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: August 17, 2021
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Omer Sadak
  • Publication number: 20210230777
    Abstract: Composite nanofibers comprising polymers and tannins, methods of making same, and methods of use. The nanofibers include a polymer, such as a synthetic polymer, and a tannin. The tannin can include condensed tannins (proanthocyanidins) and/or hydrolyzable tannins. The nanofibers exhibit a number of structural and functional characteristics, such as enhanced swelling in aqueous liquid, enhanced antibacterial activity, enhanced bacterial adsorption, enhanced fibroblast adhesion, enhanced fibroblast proliferation, and enhanced surface coating of silver nanoparticles, among others. The nanofibers can be made by electrospinning a solvent mixture comprising the synthetic polymer and the tannin in a solvent. The nanofibers can be used in methods of isolating cells, methods of filtration, and methods of detecting cells, among others.
    Type: Application
    Filed: June 11, 2020
    Publication date: July 29, 2021
    Applicant: Wisconsin Alumni Research Foundation
    Inventors: Jess Dreher Reed, Christian Gerald KRUEGER, Emilia ALFARO-VIQUEZ, Sergio MADRIGAL-CARBALLO, Hilary Urena SABORIO, Sundaram GUNASEKARAN
  • Publication number: 20210101914
    Abstract: A method to make metal-organic frameworks (MOFs) in which a first aqueous solution of a transition metal salt is mixed with a second aqueous solution of an imidazole or alkyl-substituted imidazole to yield a product solution containing MOF crystals. The MOF crystals are used to fabricate electrodes for electrochemical detection of nitro-aromatic compounds.
    Type: Application
    Filed: November 23, 2020
    Publication date: April 8, 2021
    Inventors: Sundaram Gunasekaran, Anu Pratap Mylamparambil Udayan
  • Patent number: 10889598
    Abstract: A method to make metal-organic frameworks (MOFs) in which a first aqueous solution of a transition metal salt is mixed with a second aqueous solution of an imidazole or alkyl-substituted imidazole to yield a product solution containing MOF crystals. The MOF crystals are used to fabricate electrodes for electrochemical detection of nitro-aromatic compounds.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: January 12, 2021
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Anu Pratap Mylamparambil Udayan
  • Publication number: 20200319131
    Abstract: Monodispersed colloidal gold nanoparticles (AuNPs) were synthesized by an easy, cost-effective, and eco-friendly synthesis route. The resulting AuNPs exhibited excellent electroanalytical ability to simultaneously detect toxic As(III) and As(V). The limit of quantification (LOQ) toward As(III) was 0.075 ppb (1 nM), which is well below the guideline value approved by the United States Environmental Protection Agency (US EPA) and the World Health Organization (WHO). Under the optimal conditions, a linear response in the concentration range of from about 0.075 ppb to about 0.03 ppm (1 nM-400 nM) was observed. The method is useful to detect arsenic contamination of water intended for human and animal consumption.
    Type: Application
    Filed: March 31, 2020
    Publication date: October 8, 2020
    Inventors: Sundaram Gunasekaran, Batul Kachwala, Anu Prathap Mylamparambil Udayan
  • Patent number: 10794833
    Abstract: Nanoreactors having a metal precursor in a carrier are provided. In some embodiments, upon exposure to heat, the metal precursor forms nanoparticles that can be detected, e.g., by detecting a color change in the nanoreactor and/or by detecting the number and/or size and/or size distribution and/or shape of the nanoparticles. The nanoreactors can be used, in some embodiments, as time-temperature indicators for perishable goods.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: October 6, 2020
    Assignee: WISCONSIN ALUMNI RESEARCH FOUNDATION
    Inventors: Sundaram Gunasekaran, Seok won Lim
  • Publication number: 20200278335
    Abstract: Nanoreactors comprising a metal precursor in a carrier are provided as well as methods of initiating, methods of preparing, and methods of using nanoreactors. In some embodiments, upon exposure to heat, the metal precursor forms nanoparticles that can be detected, e.g., by detecting a color change in the nanoreactor and/or by detecting the number and/or size and/or size distribution and/or shape of the nanoparticles. The nanoreactors can be used, in some embodiments, as time-temperature indicators for perishable goods.
    Type: Application
    Filed: March 3, 2020
    Publication date: September 3, 2020
    Applicant: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Yi-Cheng Wang
  • Patent number: 10684249
    Abstract: A device for measuring pH levels and contaminant concentration includes an electrode assembly that is electrically coupled to a control unit. The electrode assembly includes a first contact electrically coupled to a reference electrode, a second contact electrically coupled to a working electrode, and a third contact electrically coupled to a counter electrode. The working electrode may be modified to include a cysteine functionalized graphene oxide with polypyrrole nanocomposite. In operation, the control unit may apply a complex signal to the working electrode via the second contact in order to adhere and subsequently strip contaminant ions from the fluid sample to the working electrode. During this process, a current may be measured across the working electrode and the counter electrode to measure contaminant ion concentration. The pH of the fluid sample may also be determined by a current measured across the reference electrode and the counter electrode.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: June 16, 2020
    Assignee: UWM Research Foundation, Inc.
    Inventors: Sundaram Gunasekaran, Woo-Jin Chang, Jiang Yang, Rajesh Seenivasan
  • Patent number: 10676392
    Abstract: Described are carbon nanotube dispersions containing single-walled carbon nanotubes dispersed in a dispersant solution comprising a solvent (water, organic polar protic solvents, and/or organic polar aprotic solvents), and an azo compound. The single-walled carbon nanotubes are not cross-linked with covalent bonds. The dispersions are useful for fabricating transparent conductive thin films on flexible and inflexible substrates. Methods for making the transparent conductive thin films are also described.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: June 9, 2020
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Ashok Kumar Sundramoorthy
  • Patent number: 10578598
    Abstract: Nanoreactors comprising a metal precursor in a carrier are provided as well as methods of initiating, methods of preparing, and methods of using nanoreactors. In some embodiments, upon exposure to heat, the metal precursor forms nanoparticles that can be detected, e.g., by detecting a color change in the nanoreactor and/or by detecting the number and/or size and/or size distribution and/or shape of the nanoparticles. The nanoreactors can be used, in some embodiments, as time-temperature indicators for perishable goods.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: March 3, 2020
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Yi-Cheng Wang
  • Publication number: 20190194023
    Abstract: A method to make free-standing graphene sheets and the free-standing graphene sheets so formed. The method includes the steps of exfoliating partially oxidized graphene from a carbon-containing electrode into an aqueous solution, acidifying the aqueous solution, and separating from the acidified solution partially oxidized graphene sheet. The partially oxidized graphene is then dried to yield free-standing graphene sheet having a carbon-to-oxygen ratio of at least about 8.0.
    Type: Application
    Filed: October 31, 2018
    Publication date: June 27, 2019
    Inventors: Sundaram Gunasekaran, Omer Sadak
  • Publication number: 20190152995
    Abstract: A method to make metal-organic frameworks (MOFs) in which a first aqueous solution of a transition metal salt is mixed with a second aqueous solution of an imidazole or alkyl-substituted imidazole to yield a product solution containing MOF crystals. The MOF crystals are used to fabricate electrodes for electrochemical detection of nitro-aromatic compounds.
    Type: Application
    Filed: November 16, 2018
    Publication date: May 23, 2019
    Inventors: Sundaram Gunasekaran, Anu Pratap Mylamparambil Udayan
  • Publication number: 20180202939
    Abstract: Methods of detecting very low levels of targets, such as cells, are provided. In some embodiments, for example, the methods can detect bacteria present in a sample at concentrations less than 25 cells/mL. The method involves detecting nanoparticle aggregation in the absence of the target.
    Type: Application
    Filed: December 20, 2017
    Publication date: July 19, 2018
    Applicant: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Seokwon Lim
  • Publication number: 20180172598
    Abstract: Nanoreactors comprising a metal precursor in a carrier are provided. In some embodiments, upon exposure to heat, the metal precursor forms nanoparticles that can be detected, e.g., by detecting a color change in the nanoreactor and/or by detecting the number and/or size and/or size distribution and/or shape of the nanoparticles. The nanoreactors can be used, in some embodiments, as time-temperature indicators for perishable goods.
    Type: Application
    Filed: December 15, 2017
    Publication date: June 21, 2018
    Applicant: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Seok won Lim
  • Patent number: 9851308
    Abstract: Methods of detecting very low levels of targets, such as cells, are provided. In some embodiments, for example, the methods can detect bacteria present in a sample at concentrations less than 25 cells/mL. The method involves detecting nanoparticle aggregation in the absence of the target.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: December 26, 2017
    Assignee: Wisconsin Alumni Research Foundation (WARF)
    Inventors: Sundaram Gunasekaran, Seok won Lim
  • Publication number: 20170363572
    Abstract: A device for measuring pH levels and contaminant concentration includes an electrode assembly that is electrically coupled to a control unit. The electrode assembly includes a FLUID first contact electrically coupled to a reference electrode, a second contact electrically coupled to a working electrode, and a third contact electrically coupled to a counter electrode. The working electrode may be modified to include a cysteine functionalized graphene oxide with polypyrrole nanocomposite. In operation, the control unit may apply a complex signal to the working electrode via the second contact in order to adhere and subsequently strip contaminant ions from the fluid sample to the working electrode. During this process, a current may be measured across the reference electrode and the counter electrode to measure contaminant ion concentration. The pH of the fluid sample may also be determined by a current measured across the reference electrode and the counter electrode.
    Type: Application
    Filed: December 3, 2015
    Publication date: December 21, 2017
    Inventors: Sundaram Gunasekaran, Woo-Jin Chang, Jiang Yang, Rajesh Seenivasan
  • Publication number: 20170129804
    Abstract: Described are carbon nanotube dispersions containing single-walled carbon nanotubes dispersed in a dispersant solution comprising a solvent (water, organic polar protic solvents, and/or organic polar aprotic solvents), and an azo compound. The single-walled carbon nanotubes are not cross-linked with covalent bonds. The dispersions are useful for fabricating transparent conductive thin films on flexible and inflexible substrates. Methods for making the transparent conductive thin films are also described.
    Type: Application
    Filed: January 20, 2017
    Publication date: May 11, 2017
    Inventors: Sundaram Gunasekaran, Ashok Kumar Sundramoorthy
  • Publication number: 20160356749
    Abstract: Nanoreactors comprising a metal precursor in a carrier are provided as well as methods of initiating, methods of preparing, and methods of using nanoreactors. In some embodiments, upon exposure to heat, the metal precursor forms nanoparticles that can be detected, e.g., by detecting a color change in the nanoreactor and/or by detecting the number and/or size and/or size distribution and/or shape of the nanoparticles. The nanoreactors can be used, in some embodiments, as time-temperature indicators for perishable goods.
    Type: Application
    Filed: June 8, 2016
    Publication date: December 8, 2016
    Applicant: Wisconsin Alumni Research Foundation
    Inventors: Sundaram Gunasekaran, Yi-Cheng Wang
  • Publication number: 20160039698
    Abstract: Described is a system and corresponding method for remediating liquid waste streams. The system includes an electro-oxidation (EO) chamber, an electro-deposition (ED) chamber, and an electro-adsorption (EA) chamber. In the method, a waste stream is subjected to electro-oxidation, followed by electro-deposition and/or electro-adsorption. The method removes both organic and inorganic pollutants, as well as metals present as free ions or bound into organic or inorganic complexes.
    Type: Application
    Filed: August 6, 2015
    Publication date: February 11, 2016
    Inventors: Sundaram Gunasekaran, Nael Yasri
  • Publication number: 20150318070
    Abstract: Described are carbon nanotube dispersions containing single-walled carbon nanotubes dispersed in a dispersant solution comprising a solvent (water, organic polar protic solvents, and/or organic polar aprotic solvents), and an azo compound. The single-walled carbon nanotubes are not cross-linked with covalent bonds. The dispersions are useful for fabricating transparent conductive thin films on flexible and inflexible substrates. Methods for making the transparent conductive thin films are also described.
    Type: Application
    Filed: May 1, 2015
    Publication date: November 5, 2015
    Inventors: Sundaram Gunasekaran, Ashok Kumar Sundramoorthy