Patents by Inventor Rajib Kumar Das
Rajib Kumar Das 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: 20230397478Abstract: Various examples are provided related to electrical planarization of carbon nanotube thin films or networks. In one example, a method includes depositing one or more thin protective organic and/or inorganic layer across a nanotube film; disrupting electrical conductance of portions of the nanotube film by exposure of out-of-plane nanotubes to a planarization process that disrupts the electrical conductance through the one or more thin protective organic and/or inorganic layer; and removing the one or more thin protective organic and/or inorganic layer from the nanotube film.Type: ApplicationFiled: May 19, 2023Publication date: December 7, 2023Inventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Bo Liu, Max G. Lemaitre
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Patent number: 10815576Abstract: Disclosed herein are various layered, carbon-containing materials for use in reducing carbon dioxide. In certain embodiments, the materials comprise single wall carbon nanotubes (SWNTs).Type: GrantFiled: November 20, 2014Date of Patent: October 27, 2020Assignee: University of Florida Research Foundation, IncorporatedInventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Svetlana V. Vasilyeva
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Patent number: 10181614Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyzer for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.Type: GrantFiled: August 4, 2017Date of Patent: January 15, 2019Assignee: University of Florida Research Foundation, IncorporatedInventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Yan Wang, Hai-Ping Cheng
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Patent number: 10115972Abstract: An embodiment of the invention is an air cathode having a porous membrane with at least one hydrophobic surface that contacts a conductive catalytic film that comprises single walled carbon nanotubes (SWNTs) where the nanotubes are in intimate electrical contact. The conductive film can include fullerenes, metals, metal alloys, metal oxides, or electroactive polymers in addition to the SWNTs. In other embodiments of the invention the air cathode is a component of a metal-air battery or a fuel cell.Type: GrantFiled: April 22, 2010Date of Patent: October 30, 2018Assignee: University of Florida Research Foundation, IncorporatedInventors: Andrew Gabriel Rinzler, Rajib Kumar Das, John R. Reynolds, Ryan M. Walczak
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Publication number: 20180019491Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyser for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.Type: ApplicationFiled: August 4, 2017Publication date: January 18, 2018Applicant: University of Florida Research Foundation, Inc.Inventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Yan Wang, Hai-Ping Cheng
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Patent number: 9768460Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyzer for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.Type: GrantFiled: December 16, 2011Date of Patent: September 19, 2017Assignee: University of Florida Research Foundation, Inc.Inventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Yan Wang, Hai-Ping Cheng
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Patent number: 9742018Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyser for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.Type: GrantFiled: June 3, 2016Date of Patent: August 22, 2017Assignee: University of Florida Research Foundation, Inc.Inventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Yan Wang, Hai-Ping Cheng
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Publication number: 20170005351Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyser for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation. fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.Type: ApplicationFiled: June 3, 2016Publication date: January 5, 2017Applicant: University of Florida ResearchInventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Yan Wang, Hai-Ping Cheng
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Publication number: 20160281245Abstract: Disclosed herein are various layered, carbon-containing materials for use in reducing carbon dioxide. In certain embodiments, the materials comprise single wall carbon nanotubes (SWNTs).Type: ApplicationFiled: November 20, 2014Publication date: September 29, 2016Applicant: University of Florida Research Foundation, Inc.Inventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Svetlana V. Vasilyeva
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Patent number: 9368291Abstract: An highly porous electrically conducting film that includes a plurality of carbon nanotubes, nanowires or a combination of both. The highly porous electrically conducting film exhibits an electrical resistivity of less than 0.1 ?·cm at 25 C and a density of between 0.05 and 0.70 g/cm3. The film can exhibit a density between 0.50 and 0.85 g/cm3 and an electrical resistivity of less than 6×10?3 ?·cm at 25 C. Also included is a method of forming these highly porous electrically conducting films by forming a composite film using carbon nanotubes or nanowires and sacrificial nanoparticles or microparticles. At least a portion of the nanoparticles or microparticles are then removed from the composite film to form the highly porous electrically conducting film.Type: GrantFiled: March 26, 2010Date of Patent: June 14, 2016Assignee: University of Florida Research Foundation, Inc.Inventors: Andrew Gabriel Rinzler, John R. Reynolds, Rajib Kumar Das
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Publication number: 20130273446Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyser for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.Type: ApplicationFiled: December 16, 2011Publication date: October 17, 2013Applicant: University of Florida Research Foundation, Inc.Inventors: Andrew Gabriel Rinzler, Rajib Kumar Das, Wang Yan, Hai-Ping Cheng
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Publication number: 20120115049Abstract: An embodiment of the invention is an air cathode having a porous membrane with at least one hydrophobic surface that contacts a conductive catalytic film that comprises single walled carbon nanotubes (SWNTs) where the nanotubes are in intimate electrical contact. The conductive film can include fullerenes, metals, metal alloys, metal oxides, or electroactive polymers in addition to the SWNTs. In other embodiments of the invention the air cathode is a component of a metal-air battery or a fuel cell.Type: ApplicationFiled: April 22, 2010Publication date: May 10, 2012Applicant: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INC.Inventors: Andrew Gabriel Rinzler, Rajib Kumar Das, John R. Reynolds, Ryan M. Walczak
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Publication number: 20100207074Abstract: An highly porous electrically conducting film that includes a plurality of carbon nanotubes, nanowires or a combination of both. The highly porous electrically conducting film exhibits an electrical resistivity of less than 0.1 ?·cm at 25 C and a density of between 0.05 and 0.70 g/cm3. The film can exhibit a density between 0.50 and 0.85 g/cm3 and an electrical resistivity of less than 6×10?3 ?·cm at 25 C. Also included is a method of forming these highly porous electrically conducting films by forming a composite film using carbon nanotubes or nanowires and sacrificial nanoparticles or microparticles. At least a portion of the nanoparticles or microparticles are then removed from the composite film to form the highly porous electrically conducting film.Type: ApplicationFiled: March 26, 2010Publication date: August 19, 2010Inventors: Andrew Gabriel Rinzler, John R. Reynolds, Rajib Kumar Das
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Patent number: 7704479Abstract: An highly porous electrically conducting film that includes a plurality of carbon nanotubes, nanowires or a combination of both. The highly porous electrically conducting film exhibits an electrical resistivity of less than 0.1 O·cm at 25 C and a density of between 0.05 and 0.70 g/cm3. The film can exhibit a density between 0.50 and 0.85 g/cm3 and an electrical resistivity of less than 6×10?3 O·cm at 25 C. Also included is a method of forming these highly porous electrically conducting films by forming a composite film using carbon nanotubes or nanowires and sacrificial nanoparticles or microparticles. At least a portion of the nanoparticles or microparticles are then removed from the composite film to form the highly porous electrically conducting film.Type: GrantFiled: September 12, 2007Date of Patent: April 27, 2010Assignee: University of Florida Research Foundation, Inc.Inventors: Andrew G. Rinzler, John R. Reynolds, Rajib Kumar Das
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Publication number: 20080299030Abstract: An highly porous electrically conducting film that includes a plurality of carbon nanotubes, nanowires or a combination of both. The highly porous electrically conducting film exhibits an electrical resistivity of less than 0.1 O·cm at 25 C and a density of between 0.05 and 0.70 g/cm3. The film can exhibit a density between 0.50 and 0.85 g/cm3 and an electrical resistivity of less than 6×1031 3 O·cm at 25 C. Also included is a method of forming these highly porous electrically conducting films by forming a composite film using carbon nanotubes or nanowires and sacrificial nanoparticles or microparticles. At least a portion of the nanoparticles or microparticles are then removed from the composite film to form the highly porous electrically conducting film.Type: ApplicationFiled: September 12, 2007Publication date: December 4, 2008Applicant: University of Florida Research Foundation, Inc.Inventors: Andrew Gabriel Rinzler, John R. Reynolds, Rajib Kumar Das