WO2014138587A1 - Graphene entrainment in a host - Google Patents
Graphene entrainment in a host Download PDFInfo
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- WO2014138587A1 WO2014138587A1 PCT/US2014/021765 US2014021765W WO2014138587A1 WO 2014138587 A1 WO2014138587 A1 WO 2014138587A1 US 2014021765 W US2014021765 W US 2014021765W WO 2014138587 A1 WO2014138587 A1 WO 2014138587A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
- C01B32/19—Preparation by exfoliation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
- C01B32/23—Oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
- C01P2004/24—Nanoplates, i.e. plate-like particles with a thickness from 1-100 nanometer
Definitions
- the present invention relates in general to the field of graphene, and more particularly, to transitioning graphene into a variety of macroscale mechanical structures.
- United States Patent No. 8,216,541, issued to Jang, et al. is directed to a process for producing dispersible and conductive nano-graphene platelets from non-oxidized graphitic materials. Briefly, these inventors are said to teach a process for producing nano-graphene platelets (NGPs) that are both dispersible and electrically conducting. The process is said to include: (a) preparing a pristine NGP material from a graphitic material; and (b) subjecting the pristine NGP material to an oxidation treatment to obtain the dispersible NGP material, wherein the NGP material has an oxygen content no greater than 25% by weight.
- the conductive NGPs are said to find applications in transparent electrodes for solar cells or flat panel displays, additives for battery and supercapacitor electrodes, conductive nanocomposite for electromagnetic wave interference (EMI) shielding and static charge dissipation.
- EMI electromagnetic wave interference
- United States Patent Publication No. 20120298620 filed by Jiang, et al, is directed to a method for making graphene composite structure. Briefly the method is said to include providing a metal substrate including a first surface and a second surface opposite to the first surface, growing a graphene film on the first surface of the metal substrate by a CVD method, providing a polymer layer on the graphene film and combining the polymer layer with the graphene film, and forming a plurality of stripped electrodes by etching the metal substrate from the second surface.
- United States Patent Publication No. 20120228555 filed by Cheng, et al, is directed to a method of making graphene. Briefly, the application is said to disclose a method for making graphene by providing a starting material and heating the starting material for a time and to a temperature effective to produce graphene. In certain embodiments the applicants are said to use starting materials that include carbonaceous materials used in conjunction with, or comprising, sulfur, and essentially free of a transition metal. The graphene produced by the current method is said to be used to coat graphene-coatable materials.
- the present invention includes a method of making a graphene suspension, comprising: preparing graphene flakes with a surface area to thickness ratio greater than 300 Angstroms, and thickness of less than 160 Angstroms, wherein the graphene flakes have no significant physical surface distortions and have a surface polarity; preparing a polar or nonpolar fluid having the same polarity as said graphene flakes; and suspending said graphene flakes in said fluid by mixing until the suspension is substantially uniform.
- the suspension is a carbon allotrope.
- 95% of the flakes are from about 0.8 to 16 nanometers in thickness.
- 95% of the flakes have a surface area to thickness ratio of a minimum of 300 Angstroms.
- the maximum dimension of the flakes between 220 Angstroms and 100 microns.
- the Graphene flake has only edge oxidation.
- the method further comprises adding a bonding host and the flake surfaces have the same polarity as the bonding host.
- the mechanically exfoliating graphite into graphene flakes in done in a stirred media mill, and the stirred media mill is an Attrition mill or ball mill.
- the method outputs are substantially limited to substantially flat graphene flakes and water.
- the present invention includes a method of making a graphene suspension, comprising: preparing graphene flakes with a surface area to thickness ratio greater than 300 Angstroms, and thickness of less than 160 Angstroms, wherein the graphene flakes are substantially planar and have a surface polarity; and suspending said graphene flakes in a fluid by mixing until the suspension is substantially uniform.
- the suspension is a carbon allotrope.
- 95% of the flakes are from about 0.8 to 16 nanometers in thickness.
- 95% of the flakes have a surface area to thickness ratio of a minimum of 300 Angstroms.
- the maximum dimension of the flakes between 220 Angstroms and 100 microns.
- the Graphene flake has only edge oxidation.
- the method further comprises adding a bonding host and the flake surfaces have the same polarity as the bonding host.
- the method outputs are substantially limited to substantially flat graphene flakes and water.
- Yet another embodiment of the present invention includes a graphene suspension made by a method comprising: preparing graphene flakes with a surface area to thickness ratio greater than 300 Angstroms, and thickness of less than 160 Angstroms, wherein the graphene flakes have no significant physical surface distortions and have a surface polarity; preparing a polar or nonpolar fluid having the same polarity as said graphene flakes; and suspending said graphene flakes in said fluid by mixing until the suspension is substantially uniform.
- 95% of the flakes are from about 0.8 to 16 nanometers in thickness.
- 95% of the flakes have a surface area to thickness ratio of a minimum of 300 Angstroms.
- the maximum dimension of the flakes between 220 Angstroms and 100 microns.
- Yet another embodiment of the present invention includes a graphene suspension made by a method comprising: preparing graphene flakes with a surface area to thickness ratio greater than 300 Angstroms, and thickness of less than 160 Angstroms, wherein the graphene flakes are substantially planar and have a surface polarity; and suspending said graphene flakes in a fluid by mixing until the suspension is substantially uniform.
- 95% of the flakes are from about 0.8 to 16 nanometers in thickness.
- 95% of the flakes have a surface area to thickness ratio of a minimum of 300 Angstroms.
- the maximum dimension of the flakes between 220 Angstroms and 100 microns.
- Graphene is an allotrope of carbon.
- Graphene's purest form is a one-atom-thick planar sheet of sp 2 -bonded carbon atoms that are densely packed in a honeycomb or hexagonal crystal lattice.
- Graphene used as an additive have been shown superior mechanical, chemical, thermal, gas barrier, electrical, flame retardant and other properties compared to the native host. Improvement in the physicochemical properties of the host depends on: 1) a uniform distribution and entrainment of the graphene flake, 2) optimizing the interfacial bonding between the graphene flake and host's matrix, 3) removal of gasses entrained in the host during processing, 4) optimizing the additive's innate properties, e.g. flatness, and/or 5) optimizing the thickness to surface-area ratio of the graphene flake.
- Optimal properties of the graphene flake We have found that the performance of a graphene flake is dominated by both the texture and the surface and edge oxidation/functionalization.
- a Hummer's based process produces graphene flakes that have both a surface and edge oxidation.
- the degree of oxidation and exfoliation inherent in the Hummer's or modified based Hummer's process results in permanent corrugated disfiguration of the graphene flake.
- the combination low yield, high cost and inconsistent performance makes the approach not viable.
- the permanent corrugated structure degrades the chemical, mechanical, electrical and thermal properties of graphene flake.
- a surface oxidized graphene flake has lower performance than the single-layer graphene originally demonstrated when the graphene was first discovered in 2007.
- corrugated structure induces different shearing and loading forces to the surrounding host as the corrugated structure gives a third dimension to the ideal two dimension graphene structure.
- the ideal structure In the transmission of phonons or electrons the ideal structure is a uniform flat large area graphene structure. This is illustrated by the development activities of the semiconductor industry as they focused chemical vapor deposition thin film generated graphene material.
- a corrugated structure induces resistance and inductance to the transmission of phonons and electrons hence a planar flake has higher performance in the electron and phonon transmission relative to a corrugated structure in the surface oxidized graphene flake.
- the suspension is a carbon allotrope; 95% of the flakes are from about 0.1 to 16 nanometers in thickness; 95% of the flakes have a surface area to thickness ratio of a minimum of 300 Angstroms; the maximum dimension of the flakes between 220 Angstroms and 100 microns; the Graphene flake has only edge oxidation; the flake surface has the same polarity as the bonding host; the mechanically exfoliating graphite into graphene flakes in done in a stirred media mill, and the stirred media mill is an Attrition mill or ball mill; and/or the method outputs are substantially limited to substantially flat graphene flakes and water.
- the present invention also includes a method of making a graphene suspension, comprising: Preparing graphene flakes with a surface area to thickness ratio greater than 300 Angstroms, and thickness of less than 160 Angstroms, wherein the graphene flakes are substantially planar and have a surface polarity; Suspending said graphene flakes in said fluid by mixing until the suspension is substantially uniform.
- Optimizing the interfacial bonding between the graphene flake and host's matrix requires the two critical aspects, first is the providing of a planar pristine surface that is not distorted through the graphene production process. Secondly is the modification of the chemistry of the additive to allow full entrainment of the additive in host's matrix. For graphene this can be the modifying the OOH group with other chemical functionality to tailor the additive to be hydrophilic or hydrophobic and/or create a functional group on the additive that is similar to the host's chemistry (i.e., polarity, hydrophilicity, etc.).
- the fluids can include plastics, metals, ceramics and glass.
- Thickness to surface area ratio of the graphene flake Using a planar graphene flake the next issue of implementing in a host is the thickness to surface-area of the graphene flake.
- the thickness to surface-area ratio of the graphene flake plays a significant ability in the graphene flakes ability to positively impact the host's properties.
- a 48,400 A 2 area flake with a thickness of 160 A has a surface area to thickness ratio of about 300 Angstroms can also provide enhancement to the host's mechanical properties (preferably 95% of the graphene flakes of the present invention have a surface area to thickness ratio of a minimum of 300 Angstroms).
- our flake thicknesses are 16 nanometers or less as too many layers significantly reduce the tensile strength (preferably 95% of the graphene flakes of the present invention are from about 0.8 to 16 nanometers), and our surface area to thickness ratio is greater than 48400 to 1 Angstroms.
- the maximum dimension of the flake varies between 220 Angstroms and 100 microns. This requires precise process control or a process that allows separation of the graphene flakes by surface area and/or thickness.
- the third aspect of obtaining an effective uniform distribution and entrainment of graphene flake as an additive in the host fluid is the aggressively mixing the flake into the host fluid (for example, under an at least partial vacuum), prior to reacting, casting or otherwise causing the host to become ordered by thermal, chemical, electrical or other processes that induce order or bonding in the host, e.g. solidified of gelled.
- epoxy that is dried is used, and then thermally set after mixing.
- greater than 6% loading of graphene is used (e.g. between 6 and 35%).
- Obtaining consistent size and thickness can require controlled pre-processing (e.g., milling and separation) of the crystalline graphite.
- Chemo-mechanical processing can use crystalline graphite with a mild oxidizing agent in conjunction with mechanical energy (milling) for synthesis of graphene.
- the mechanical energy in conjunction with a mild oxidizing environment can produce edge oxidation of the graphene minimizing the surface oxidation and mechanical defects generated in a Hummer's based process.
- Graphite (TC306, 30g) can be used as the starting material for the graphene chemo-mechanical process.
- Chemo-mechanical process can be done in what is generically referred to as a "stirred ball mill.”
- a useful and simple equation describing the grinding momentum is M x V (mass x velocity), which enables us to see how an ball milling use up to 6 lbs (2.7 Kg) (or -2,600 stainless steel balls) of 0.25" diameter stainless steel balls weighing 1 g each. Milling in a closed chamber for 360 minutes at 2,000 RPM or less.
- the resulting graphene preferably has edge- only oxidized flakes with a pristine surface free of distortions or corrugations with low surface energies allowing for easier incorporation and entrainment in a host with enhance graphene physical properties.
- the oxidation of the graphene can occur from a wide range of methods of making graphene oxide, comprising: Putting crystalline graphite and an atomizer or aerosolized oxidizing agent in a mill, wherein the atomizer or aerosolized oxidizing exfoliating agent contains only carbon, oxygen, hydrogen and combinations thereof; Milling said crystalline graphite and atomizer or aerosolized oxidizing exfoliating agent to produce planar graphene flakes having a thickness of less than 160 Angstroms; and Suspending said graphene flakes in a fluid to remove the graphene flakes from the mill.
- This can be a technique for low cost, mass-production of a partially oxidized to fully oxidized graphite/graphene using mechanical processing (Attritor Mill) in conjunction with a water soluble exfoliating agent, such as kaolin clay powder and at least one of atomizer or aerosolized carbolic acid or oxalic acid (C2H2O4), acetic acid, carbonic acid or ethanoic (CHsCO ⁇ O, and citric acid.
- Aerosolization can be accomplished by an Ultrasonic Atomizer Processor, ultrasonic spray & atomization system made by U&STAR Ultrasonic Technology.
- An ultrasonic spray system uses an ultrasound technology to atomize liquid or powders generated from ultrasonic energy that scattered the liquid forming droplets ranging microns to more than 100 microns. Liquid droplets that may contain powders and soluble matter, promoting chemical reaction, and spraying. This ultrasonic spray atomization has low power, large volume. An ultrasonic spray system widely applied on kinds of industrial applications including ultrasonic spraying liquid, metal power water nebulization or atomization. The controlled small droplet sizes provide a high surface to volume ratio enhancing efficiency and control chemical reactions.
- the atomizer or aerosolized oxidizing agent is injected into a mill in addition to the crystalline graphite. Directly milling of graphite powder without concentrated acid, for aerosolized oxidizing, to produce high quality oxidized graphene. After milling the crystalline graphite with an aerosolized oxidizing agent is injected into the attritor mill for a minimum of 30 min to produce an aqueous slurry.
- the aqueous slurry contains a mild acid that breaks down into water and graphite.
- the water can dissolve the water-soluble exfoliating agent.
- An example of a water-soluble exfoliating agent is kaolin clay powder.
- the mild aerosolized oxidizing agent produces oxidized graphene with no distortion or texturing. Textured graphene oxide produces significant problems when depositing the graphene oxide, using the graphene oxide in a suspension or as an additive to other materials.
- Directly milling of graphite powder with a chemically stable gaseous oxidizing agent in addition to the gaseous oxidizing agent a water-soluble exfoliating agent, such as kaolin clay powder can be added to process to produce high quality edge oxidized graphene.
- a water-soluble exfoliating agent such as kaolin clay powder
- the chemo-mechanical processing initiate graphene oxidation resulting edge oxidized graphene.
- pressure in the chamber decreases in the Attritor mill. Keeping the Attritor mill at an elevate pressure during the oxidation process enables a higher level of oxidation of the graphene flakes.
- graphene oxide may be made, by: Putting crystalline graphite, and vapor phase oxidizing agent in a mill, wherein the oxidizing agent comprises nitrogen, carbon, oxygen, hydrogen and/or combinations thereof; Milling said crystalline graphite and vapor phase oxidizing agent to produce planar graphene flakes having a thickness of less than 160 Angstroms; and Suspending said graphene flakes in a fluid to remove the graphene flakes from the mill.
- the milling is done in a stirred mill; the stirred mill is an Attrition mill or Attritor; the method outputs are substantially limited to substantially flat graphene flakes and carbon, oxygen, hydrogen and combinations thereof; and/or the anhydrous oxidizing exfoliating agent is at least one of crystal carbolic acid or anhydrous oxalic acid (C 2 H 2 O 4 ), Acetic anhydride, or ethanoic anhydride (CH 3 CO) 2 0, and anhydrous citric acid powder.
- the stirred mill is an Attrition mill or Attritor
- the method outputs are substantially limited to substantially flat graphene flakes and carbon, oxygen, hydrogen and combinations thereof
- the anhydrous oxidizing exfoliating agent is at least one of crystal carbolic acid or anhydrous oxalic acid (C 2 H 2 O 4 ), Acetic anhydride, or ethanoic anhydride (CH 3 CO) 2 0, and anhydrous citric acid powder.
- the edge oxide graphene can be chemically separated via acidic precipitation by titrating hydrochloric acid into the bath the larger (thicker/heavier) material comes out of suspension first creating a narrow graphene oxide flake distribution.
- the particle size can be monitored during this process by Dynamic Light Scattering measurement tool. Dynamic Light Scattering tools can resolve particle sizes down to 30A.
- the surface area to thickness ratio should be greater than about 300 to have a positive impact on the host as a suspension.
- the pH of the water containing the oxidized graphite/graphene can range from 5 to 9 while maintaining the suspension of the media the pH of the resulting water/graphene mixture is typically is about 7.
- a chemo-mechanical can be controlled to process graphene with oxidization of from 1% to 35%.
- graphene as used herein means graphene with oxidization of from 1% to 35%.
- the functionalization can be COOH on the edge carbons preserving the graphene structure.
- Oxidized graphite produced by this method is typically hydrophilic and easily suspended in a neutral aqueous solution.
- the oxidized graphite can be kept in suspension until varying the pH of the solution.
- a ball mill operating with less than or equal to 2,000 RPM can be generally sufficient to prevent agglomeration of the graphene adhering to the milling balls or tank.
- the graphene can be combined with the host material in a mechanical agitation process.
- Graphene is diamagnetic and as such dynamic magnetic fields can be used to enhance orientation and mixing along in addition other method such as: melt blending, counter rotating screw, sonication or other mixing processes of the graphene additive into the host material prior to inducing ordering or bonding in the host.
- the entrainment and uniform dispersement preferably uses a minimum of 30 minutes of and less than 600 minutes in a ball mill.
- the resulting graphene entrained host can be the cast, extruded or otherwise processed into the final product by inducing long or short range ordering or bonding through chemical, thermal, electrical, shearing, or mechanical treatments.
- compositions of the invention can be used to achieve methods of the invention.
- the words “comprising” (and any form of comprising, such as “comprise” and “comprises"), “having” (and any form of having, such as “have” and “has”), “including” (and any form of including, such as “includes” and “include”) or “containing” (and any form of containing, such as “contains” and “contain”) are inclusive or open-ended and do not exclude additional, unrecited elements or method steps.
- “comprising” may be replaced with “consisting essentially of or “consisting of.
- the phrase “consisting essentially of requires the specified integer(s) or steps as well as those that do not materially affect the character or function of the claimed invention.
- the term “consisting” is used to indicate the presence of the recited integer (e.g., a feature, an element, a characteristic, a property, a method/process step or a limitation) or group of integers (e.g., feature(s), element(s), characteristic(s), propertie(s), method/process steps or limitation(s)) only.
- A, B, C, or combinations thereof refers to all permutations and combinations of the listed items preceding the term.
- A, B, C, or combinations thereof is intended to include at least one of: A, B, C, AB, AC, BC, or ABC, and if order is important in a particular context, also BA, CA, CB, CBA, BCA, ACB, BAC, or CAB.
- expressly included are combinations that contain repeats of one or more item or term, such as BB, AAA, AB, BBC, AAABCCCC, CBBAAA, CABABB, and so forth.
- BB BB
- AAA AAA
- AB BBC
- AAABCCCCCC CBBAAA
- CABABB CABABB
- words of approximation such as, without limitation, "about”, “substantial” or “substantially” refers to a condition that when so modified is understood to not necessarily be absolute or perfect but would be considered close enough to those of ordinary skill in the art to warrant designating the condition as being present.
- the extent to which the description may vary will depend on how great a change can be instituted and still have one of ordinary skilled in the art recognize the modified feature as still having the required characteristics and capabilities of the unmodified feature.
- a numerical value herein that is modified by a word of approximation such as "about” may vary from the stated value by at least ⁇ 1, 2, 3, 4, 5, 6, 7, 10, 12 or 15%.
- compositions and/or methods disclosed and claimed herein can be made and executed without undue experimentation in light of the present disclosure. While the compositions and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to the compositions and/or methods and in the steps or in the sequence of steps of the method described herein without departing from the concept, spirit and scope of the invention. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and concept of the invention as defined by the appended claims.
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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KR1020157028043A KR101939968B1 (en) | 2013-03-08 | 2014-03-07 | Graphene entrainment in a host |
US14/773,013 US10535443B2 (en) | 2013-03-08 | 2014-03-07 | Graphene entrainment in a host |
CA2904059A CA2904059C (en) | 2013-03-08 | 2014-03-07 | Graphene entrainment in a host |
JP2015561714A JP6134396B2 (en) | 2013-03-08 | 2014-03-07 | Graphene companion at the host |
EP14759787.6A EP2964573A4 (en) | 2013-03-08 | 2014-03-07 | Graphene entrainment in a host |
US16/702,761 US11361877B2 (en) | 2013-03-08 | 2019-12-04 | Graphene entrainment in a host |
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US201361775024P | 2013-03-08 | 2013-03-08 | |
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US201361775087P | 2013-03-08 | 2013-03-08 | |
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US14/773,013 A-371-Of-International US10535443B2 (en) | 2013-03-08 | 2014-03-07 | Graphene entrainment in a host |
US16/702,761 Continuation US11361877B2 (en) | 2013-03-08 | 2019-12-04 | Graphene entrainment in a host |
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US (2) | US10535443B2 (en) |
EP (1) | EP2964573A4 (en) |
JP (1) | JP6134396B2 (en) |
KR (1) | KR101939968B1 (en) |
CA (1) | CA2904059C (en) |
WO (1) | WO2014138587A1 (en) |
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WO2016154057A1 (en) * | 2015-03-23 | 2016-09-29 | Garmor Inc. | Engineered composite structure using graphene oxide |
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US9951436B2 (en) | 2011-10-27 | 2018-04-24 | Garmor Inc. | Composite graphene structures |
US10535443B2 (en) | 2013-03-08 | 2020-01-14 | Garmor Inc. | Graphene entrainment in a host |
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US11791061B2 (en) | 2019-09-12 | 2023-10-17 | Asbury Graphite North Carolina, Inc. | Conductive high strength extrudable ultra high molecular weight polymer graphene oxide composite |
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CN106542525B (en) * | 2016-10-27 | 2018-09-11 | 董兰田 | Continuous adhesive tape legal system takes stripping degumming and the packing method of graphene |
US10653183B2 (en) * | 2016-11-18 | 2020-05-19 | Rai Strategic Holdings, Inc. | Power source for an aerosol delivery device |
EP3388168B1 (en) | 2017-04-12 | 2022-02-16 | Hitachi Energy Switzerland AG | Graphene composite material for sliding contact |
JP2020075201A (en) * | 2018-11-05 | 2020-05-21 | 株式会社亀山鉄工所 | Flake production method |
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Also Published As
Publication number | Publication date |
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EP2964573A1 (en) | 2016-01-13 |
KR101939968B1 (en) | 2019-01-18 |
US11361877B2 (en) | 2022-06-14 |
KR20150128889A (en) | 2015-11-18 |
US20200105435A1 (en) | 2020-04-02 |
US20160016803A1 (en) | 2016-01-21 |
CA2904059C (en) | 2019-06-11 |
US20170152147A9 (en) | 2017-06-01 |
EP2964573A4 (en) | 2016-11-02 |
US10535443B2 (en) | 2020-01-14 |
JP2016517382A (en) | 2016-06-16 |
CA2904059A1 (en) | 2014-09-12 |
JP6134396B2 (en) | 2017-05-24 |
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