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Patent
Nanotek Instruments, Inc. | Date: 2016-11-17

A process for producing a transparent conductive film, comprising (a) providing a graphene oxide gel; (b) dispersing metal nanowires in the graphene oxide gel to form a suspension; (c) dispensing and depositing the suspension onto a substrate; and (d) removing the liquid medium to form the film. The film is composed of metal nanowires and graphene oxide with a metal nanowire-to-graphene oxide weight ratio from 1/99 to 99/1, wherein the metal nanowires contain no surface-borne metal oxide or metal compound and the film exhibits an optical transparence no less than 80% and sheet resistance no higher than 300 ohm/square. This film can be used as a transparent conductive electrode in an electro-optic device, such as a photovoltaic or solar cell, light-emitting diode, photo-detector, touch screen, electro-wetting display, liquid crystal display, plasma display, LED display, a TV screen, a computer screen, or a mobile phone screen.


Patent
Nanotek Instruments, Inc. | Date: 2016-11-17

A unitary graphene layer or graphene single crystal containing closely packed and chemically bonded parallel graphene planes having an inter-graphene plane spacing of 0.335 to 0.40 nm and an oxygen content of 0.01% to 10% by weight, which unitary graphene layer or graphene single crystal is obtained from heat-treating a graphene oxide gel at a temperature higher than 100 C., wherein the average mis-orientation angle between two graphene planes is less than 10 degrees, more typically less than 5 degrees. The molecules in the graphene oxide gel, upon drying and heat-treating, are chemically interconnected and integrated into a unitary graphene entity containing no discrete graphite flake or graphene platelet. This graphene monolith exhibits a combination of exceptional thermal conductivity, electrical conductivity, mechanical strength, surface smoothness, surface hardness, and scratch resistance unmatched by any thin-film material of comparable thickness range.


Liu C.,Nanotek Instruments, Inc. | Liu C.,Dalian University of Technology | Yu Z.,Angstron Materials, Inc | Neff D.,Nanotek Instruments, Inc. | And 2 more authors.
Nano Letters | Year: 2010

A supercapacitor with graphene-based electrodes was found to exhibit a specific energy density of 85.6 Wh/kg at room temperature and 136 Wh/kg at 80 °C (all based on the total electrode weight), measured at a current density of 1 A/g. These energy density values are comparable to that of the Ni metal hydride battery, but the supercapacitor can be charged or discharged in seconds or minutes. The key to success was the ability to make full utilization of the highest intrinsic surface capacitance and specific surface area of single-layer graphene by preparing curved graphene sheets that will not restack face-to-face. The curved morphology enables the formation of mesopores accessible to and wettable by environmentally benign ionic liquids capable of operating at a voltage >4 V. © 2010 American Chemical Society.


Zhamu A.,Nanotek Instruments, Inc. | Zhamu A.,Angstron Materials, Inc | Chen G.,Nanotek Instruments, Inc. | Liu C.,Nanotek Instruments, Inc. | And 7 more authors.
Energy and Environmental Science | Year: 2012

Herein reported is a fundamentally new strategy for reviving rechargeable lithium (Li) metal batteries and enabling the emergence of next-generation safe batteries featuring a graphene-supported Li metal anode, including the highly promising Li-sulfur, Li-air, and Li-graphene cells with exceptionally high energy or power densities. All the Li metal anode-based batteries suffer from a high propensity to form Li dendrites (tree-like structures) at the anode upon repeated discharges/charges. A dendrite could eventually penetrate through the separator to reach the cathode, causing internal short-circuiting and even explosion, the main reason for the battery industry to abandon rechargeable lithium metal batteries in the early 1990s. By implementing graphene sheets to increase the anode surface areas, one can significantly reduce the anode current density, thereby dramatically prolonging the dendrite initiation time and decreasing the growth rate of a dendrite, if ever initiated, possibly by a factor of up to 10 10 and 10 5, respectively. © The Royal Society of Chemistry 2012.


Fulvio P.F.,Oak Ridge National Laboratory | Lee J.S.,Oak Ridge National Laboratory | Lee J.S.,Kyung Hee University | Mayes R.T.,Oak Ridge National Laboratory | And 4 more authors.
Physical Chemistry Chemical Physics | Year: 2011

A novel strategy for tailoring the adsorption and structural properties of ionic liquid derived carbons has been developed. By changing the carbonization temperature and ratios of ionic liquids (ILs) containing a cross-linkable anion, such as 1-butyl-3-methylimidazolium tricyanomethanide [BMIm][C(CN)3] and 1-ethyl-3-methylimidazolium tetracyanoborate [EMIm][B(CN)4], boron and nitrogen-rich carbons with slit-like pores and specific surface areas exceeding 500 m2 g-1 have been prepared. Furthermore, the nitrogen-rich carbons exhibit high adsorption capacity for CO2 adsorption and selectivity for CO2/N2 separation. © the Owner Societies 2011.


Jang B.Z.,Nanotek Instruments, Inc. | Liu C.,Nanotek Instruments, Inc. | Neff D.,Nanotek Instruments, Inc. | Yu Z.,Angstron Materials, Inc | And 4 more authors.
Nano Letters | Year: 2011

Herein reported is a fundamentally new strategy for the design of high-power and high energy-density devices. This approach is based on the exchange of lithium ions between the surfaces (not the bulk) of two nanostructured electrodes, completely obviating the need for lithium intercalation or deintercalation. In both electrodes, massive graphene surfaces in direct contact with liquid electrolyte are capable of rapidly and reversibly capturing lithium ions through surface adsorption and/or surface redox reaction. These devices, based on unoptimized materials and configuration, are already capable of storing an energy density of 160 Wh/kgcell, which is 30 times higher than that (5 Wh/kgcell) of conventional symmetric supercapacitors and comparable to that of Li-ion batteries. They are also capable of delivering a power density of 100 kW/kgcell, which is 10 times higher than that (10 kW/kgcell) of supercapacitors and 100 times higher than that (1 kW/kgcell) of Li-ion batteries. © 2011 American Chemical Society.


Grant
Agency: National Science Foundation | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 149.99K | Year: 2010

This Small Business Innovation Research Phase I project seeks to develop a new generation of anode materials for lithium-ion batteries having the advantages of low cost, high Li+ ion storage capacity, high rate, and long cycling life. These anode materials are innovative nanocomposite structures made up of Si nano particles, carbon, and nano graphene platelets (NGPs). NGPs were recently shown to exhibit the highest intrinsic strength among existing materials. This reasearch aims to demonstrate the technical feasibility of this electrode technology by carrying out the following tasks: (1) preparation and characterization of the nanocomposite particles based on theoretical guidelines, and (2) cycling performance evaluation of laboratory-scale cells. The goal is the development of an anode material with a capacity over 700 mAh/g. The broader/commercial impact of this project is that the availability of a high-capacity and high-rate anode material will overcome one of the barriers that have prevented the more widespread implementation of Li-ion batteries in electric vehicle applications. If successful, the new anode technology is expected to speed the development and deployment of advanced lithium-ion batteries for electric vehicles. The batteries that use this anode material will have enhanced the charge/discharge rates and enable electric vehicles with higher mileage range. The technology is expected to have positive impact in several of the nation's energy-related initiatives: reduction of greenhouse gas and other emissions, and decrease in dependence on imported fossil fuel. Moreover, the successful commercialization of this technology is expected to provide a differentiating capability that can strengthen Li-ion battery development and manufacturing within the US.


Grant
Agency: NSF | Branch: Standard Grant | Program: | Phase: | Award Amount: 463.41K | Year: 2011

This Small Business Innovation Research (SBIR) Phase II project aims to develop cost-effective and commercializable anode materials exhibiting large lithium storage capacity, high rate capability, and long cycle life for next generation lithium-ion batteries. Silicon-based anode materials hold great potential to meet the high energy density requirements for advanced lithium ion batteries. However, the intrinsic low electrical conductivity and huge volume change of silicon during lithium insertion and extraction lead to quick electrode failure, and thus hindering their practical applications. The proposed Si nanocomposites are expected to effectively prevent the crumbling of Si particles, maintain the integrity of the electron-conducting network, and allow the electrolyte solution to easily access the active sites. This phase II project will develop and optimize the nanocomposite compositions and related synthesis and processing procedure to accelerate industrial scale manufacturing of anode materials in the US.

The broader impact/commercial potential of this project is the development of a new anode technology capable of exploiting a dramatic improvement in lithium ion battery performance, which will speed the deployment of advanced lithium ion batteries for plug-in hybrid electric vehicles and all electric vehicles.


Grant
Agency: National Science Foundation | Branch: | Program: SBIR | Phase: Phase II | Award Amount: 463.41K | Year: 2012

This Small Business Innovation Research (SBIR) Phase II project aims to develop cost-effective and commercializable anode materials exhibiting large lithium storage capacity, high rate capability, and long cycle life for next generation lithium-ion batteries. Silicon-based anode materials hold great potential to meet the high energy density requirements for advanced lithium ion batteries. However, the intrinsic low electrical conductivity and huge volume change of silicon during lithium insertion and extraction lead to quick electrode failure, and thus hindering their practical applications. The proposed Si nanocomposites are expected to effectively prevent the crumbling of Si particles, maintain the integrity of the electron-conducting network, and allow the electrolyte solution to easily access the active sites. This phase II project will develop and optimize the nanocomposite compositions and related synthesis and processing procedure to accelerate industrial scale manufacturing of anode materials in the US. The broader impact/commercial potential of this project is the development of a new anode technology capable of exploiting a dramatic improvement in lithium ion battery performance, which will speed the deployment of advanced lithium ion batteries for plug-in hybrid electric vehicles and all electric vehicles.


Trademark
Nanotek Instruments, Inc. | Date: 2012-12-11

Filter machines, namely, extraction machines and separation machines; filters for extraction machines, separating machines, motors, engines, petrochemical industrial machines, agro food industry machines, paper industry machines, chemical and pharmaceutical industry machines; motors or engines other than for land vehicles; machine coupling and transmission components other than for land vehicles. Apparatus for steam generating, refrigerating, namely, steam generators and refrigerators; water distribution apparatus and their filters, namely, water purification and filtration apparatus; sanitary installations specifically filters being parts of household or industrial installations, namely, water filters. Scientific and technological services, namely, scientific research, analysis and testing in the field of filtration and purification of water and research and design relating thereto; industrial analysis and research services in the field of ceramic membrane filters and cartridge filters; design and development of computer hardware and software.

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