Patents by Inventor Padma Gopalan

Padma Gopalan 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).

  • Publication number: 20230159435
    Abstract: Formamide group-containing monomers and polymers made by polymerizing the monomers are provided. Also provided are methods of polymerizing the monomers and methods of synthesizing functionalized polymers by pre- and/or post-polymerization functionalization. The monomers are non-toxic and can generate highly reactive isocyanate and isonitrile precursors in a one-pot synthesis that enables the incorporation of complex functionalities into the side-chain of the polymers that are synthesized from the monomers.
    Type: Application
    Filed: January 3, 2023
    Publication date: May 25, 2023
    Inventors: Padma Gopalan, Balamurugan Ayyakkalai, Ri Chen
  • Patent number: 11631814
    Abstract: Methods of forming films of aligned carbon nanotubes on a substrate surface are provided. The films are deposited from carbon nanotubes that have been concentrated and confined at a two-dimensional liquid/liquid interface. The liquid/liquid interface is formed by a dispersion of organic material-coated carbon nanotubes that flows over the surface of an immiscible liquid within a flow channel. Within the interface, the carbon nanotubes self-organize via liquid crystal phenomena and globally align along the liquid flow direction. By translating the interface across the substrate, large-area, wafer-scale films of aligned carbon nanotubes can be deposited on the surface of the substrate in a continuous and scalable process.
    Type: Grant
    Filed: July 15, 2021
    Date of Patent: April 18, 2023
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Michael Scott Arnold, Katherine Rose Jinkins, Padma Gopalan
  • Patent number: 11572335
    Abstract: Formamide group-containing monomers and polymers made by polymerizing the monomers are provided. Also provided are methods of polymerizing the monomers and methods of synthesizing functionalized polymers by pre- and/or post-polymerization functionalization. The monomers are non-toxic and can generate highly reactive isocyanate and isonitrile precursors in a one-pot synthesis that enables the incorporation of complex functionalities into the side-chain of the polymers that are synthesized from the monomers.
    Type: Grant
    Filed: March 11, 2020
    Date of Patent: February 7, 2023
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Padma Gopalan, Balamurugan Ayyakkalai, Ri Chen
  • Publication number: 20230028346
    Abstract: Methods of forming films of aligned carbon nanotubes on a substrate surface are provided. The films are deposited from carbon nanotubes that have been concentrated and confined at a two-dimensional liquid/liquid interface. The liquid/liquid interface is formed by a dispersion of organic material-coated carbon nanotubes that flows over the surface of an immiscible liquid within a flow channel. Within the interface, the carbon nanotubes self-organize via liquid crystal phenomena and globally align along the liquid flow direction. By translating the interface across the substrate, large-area, wafer-scale films of aligned carbon nanotubes can be deposited on the surface of the substrate in a continuous and scalable process.
    Type: Application
    Filed: July 15, 2021
    Publication date: January 26, 2023
    Inventors: Michael Scott Arnold, Katherine Rose Jinkins, Padma Gopalan
  • Publication number: 20220306475
    Abstract: Methods of transferring nanostructures from a first substrate to another substrate using a copolymer polymerized from one or more non-crosslinking monomers and one or more comonomers bearing crosslinkable groups as a transfer medium are provided. Relative to a poly(methyl methacrylate) homopolymer, the crosslinkable copolymers bond more strongly to the first substrate and, as a result, are able to transfer even very narrow nanostructures between substrates with high transfer yields.
    Type: Application
    Filed: March 23, 2021
    Publication date: September 29, 2022
    Inventors: Michael Scott Arnold, Robert Michael Jacobberger, Padma Gopalan, Jonathan H. Dwyer
  • Patent number: 11421127
    Abstract: Random copolymers, crosslinked thin films of the random copolymers and cell culture substrates comprising the crosslinked thin films are provided. Also provided are methods of making and using the copolymers, thin films and substrates. The copolymers are polymerized from glycidyl methacrylate monomers and vinyl azlactone monomers. The crosslinked thin films are substrate independent, in that they need not be covalently bound to a substrate to form a stable film on the substrate surface.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: August 23, 2022
    Inventors: Padma Gopalan, William L. Murphy, Samantha Kelly Schmitt
  • Publication number: 20220255001
    Abstract: Methods for forming films of aligned carbon nanotubes are provided. Also provided are the films formed by the methods and electronic devices that incorporate the films as active layers. The films are formed by flowing a suspension of carbon nanotubes over a substrate surface that is chemically and topographically patterned. The methods provide a rapid and scalable means of forming films of densely packed and aligned carbon nanotubes over large surface areas.
    Type: Application
    Filed: February 3, 2022
    Publication date: August 11, 2022
    Inventors: Padma Gopalan, Jonathan H. Dwyer, Katherine Jinkins, Michael Scott Arnold
  • Patent number: 10913873
    Abstract: Block copolymers for use in block copolymer lithography, self-assembled films of the block copolymers and methods for polymerizing the block copolymers are provided. The block copolymers are characterized by high Flory-Huggins interaction parameters (?). The block copolymers can be polymerized from protected hydroxystyrene monomers or from tert-butyl styrene and 2-vinylpyridine monomers.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: February 9, 2021
    Assignee: WISCONSIN ALUMNI RESEARCH FOUNDATION
    Inventors: Padma Gopalan, Daniel Patrick Sweat, Xiang Yu, Myungwoong Kim
  • Patent number: 10873026
    Abstract: Methods for forming carbon nanotube arrays are provided. Also provided are the arrays formed by the methods and electronic devices that incorporate the array as active layers. The arrays are formed by flowing a fluid suspension of carbon nanotubes through a confined channel under conditions that create a velocity gradient across the flowing suspension.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: December 22, 2020
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Michael Scott Arnold, Katherine Rose Jinkins, Gerald Joseph Brady, Padma Gopalan
  • Patent number: 10815125
    Abstract: Polymers having pendant polycyclic aromatic hydrocarbon (PAH) groups covalently bound to the polymer backbone via thioester bonds are provided. The PAH groups are covalently bound to the backbone of the polymer by a molecular linker that includes a thioester bond. Also provided are dispersions of polymer-coated carbon nanotubes and carbon nanotube films formed from the dispersions.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: October 27, 2020
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Padma Gopalan, Michael Scott Arnold, Catherine Kanimozhi Kansiusarulsamy, Matthew John Shea
  • Publication number: 20200290949
    Abstract: Formamide group-containing monomers and polymers made by polymerizing the monomers are provided. Also provided are methods of polymerizing the monomers and methods of synthesizing functionalized polymers by pre- and/or post-polymerization functionalization. The monomers are non-toxic and can generate highly reactive isocyanate and isonitrile precursors in a one-pot synthesis that enables the incorporation of complex functionalities into the side-chain of the polymers that are synthesized from the monomers.
    Type: Application
    Filed: March 11, 2020
    Publication date: September 17, 2020
    Inventors: Padma Gopalan, Balamurugan Ayyakkalai, Ri Chen
  • Publication number: 20200190353
    Abstract: Random copolymers, crosslinked thin films of the random copolymers and cell culture substrates comprising the crosslinked thin films are provided. Also provided are methods of making and using the copolymers, thin films and substrates. The copolymers are polymerized from glycidyl methacrylate monomers and vinyl azlactone monomers. The crosslinked thin films are substrate independent, in that they need not be covalently bound to a substrate to form a stable film on the substrate surface.
    Type: Application
    Filed: November 27, 2019
    Publication date: June 18, 2020
    Inventors: Padma Gopalan, William L. Murphy, Samantha Kelly Schmitt
  • Patent number: 10557054
    Abstract: Random copolymers, crosslinked thin films of the random copolymers and cell culture substrates comprising the crosslinked thin films are provided. Also provided are methods of making and using the copolymers, thin films and substrates. The copolymers are polymerized from glycidyl methacrylate monomers and vinyl azlactone monomers. The crosslinked thin films are substrate independent, in that they need not be covalently bound to a substrate to form a stable film on the substrate surface.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: February 11, 2020
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Padma Gopalan, William L. Murphy, Samantha Kelly Schmitt
  • Patent number: 10465087
    Abstract: Crosslinkable random copolymers comprising atom transfer radical polymerization (ATRP) initiators and crosslinked copolymer films formed from the copolymers are provided. The random copolymers, which are polymerized from one or more alkyl halide functional inimers and one or more monomers having a crosslinkable functionality, are characterized by pendant ATRP initiating groups and pendant crosslinkable groups.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: November 5, 2019
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Padma Gopalan, Daniel Patrick Sweat, Myungwoong Kim
  • Publication number: 20190210876
    Abstract: Polymers having pendant polycyclic aromatic hydrocarbon (PAH) groups covalently bound to the polymer backbone via thioester bonds are provided. The PAH groups are covalently bound to the backbone of the polymer by a molecular linker that includes a thioester bond. Also provided are dispersions of polymer-coated carbon nanotubes and carbon nanotube films formed from the dispersions.
    Type: Application
    Filed: January 5, 2018
    Publication date: July 11, 2019
    Inventors: Padma Gopalan, Michael Scott Arnold, Catherine Kanimozhi Kansiusarulsamy, Matthew John Shea
  • Patent number: 10252914
    Abstract: Methods of producing layers of patterned graphene with smooth edges are provided. The methods comprise the steps of fabricating a layer of crystalline graphene on a surface, wherein the layer of crystalline graphene has a crystallographically disordered edge, and decreasing the crystallographic disorder of the edge of the layer of crystalline graphene by heating the layer of crystalline graphene on the surface at an elevated temperature in a catalytic environment comprising carbon-containing molecules.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: April 9, 2019
    Assignee: WISCONSIN ALUMNI RESEARCH FOUNDATION
    Inventors: Michael Scott Arnold, Padma Gopalan, Nathaniel S. Safron, Myungwoong Kim
  • Patent number: 10106699
    Abstract: Crosslinkable random copolymers comprising atom transfer radical polymerization (ATRP) initiators and crosslinked copolymer films formed from the copolymers are provided. The random copolymers, which are polymerized from one or more alkyl halide functional inimers and one or more monomers having a crosslinkable functionality, are characterized by pendant ATRP initiating groups and pendant crosslinkable groups.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: October 23, 2018
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Padma Gopalan, Daniel P. Sweat, Myungwoong Kim
  • Patent number: 10100163
    Abstract: The present invention provides crosslinked epoxy-functional copolymer films and microarrays built from the crosslinked epoxy-functional copolymer films. Microarrays incorporating the copolymers include a substrate on which a film of the crosslinked epoxy-functional copolymer is disposed and target molecules bound to the copolymer film. The crosslinked polymer films are well-suited for use as scaffolds for target molecules in microarrays because they provide a high density of binding sites for the target molecules, are mechanically stable, and may be coated onto a wide range of substrates.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: October 16, 2018
    Assignee: Wisconsin Alumni Research Foundation
    Inventor: Padma Gopalan
  • Publication number: 20180261772
    Abstract: Methods for forming carbon nanotube arrays are provided. Also provided are the arrays formed by the methods and electronic devices that incorporate the array as active layers. The arrays are formed by flowing a fluid suspension of carbon nanotubes through a confined channel under conditions that create a velocity gradient across the flowing suspension.
    Type: Application
    Filed: March 10, 2017
    Publication date: September 13, 2018
    Inventors: Michael Scott Arnold, Katherine Rose Jinkins, Gerald Joseph Brady, Padma Gopalan
  • Patent number: 10074819
    Abstract: High density films of semiconducting single-walled carbon nanotubes having a high degree of nanotube alignment are provided. Also provided are methods of making the films and field effect transistors (FETs) that incorporate the films as conducting channel materials. The single-walled carbon nanotubes are deposited from a thin layer of organic solvent containing solubilized single-walled carbon nanotubes that is spread over the surface of an aqueous medium, inducing evaporative self-assembly upon contacting a solid substrate.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: September 11, 2018
    Assignee: WISCONSIN ALUMNI RESEARCH FOUNDATION
    Inventors: Michael Scott Arnold, Padma Gopalan, Gerald Joseph Brady, Yongho Joo, Harold T. Evensen