Production process for chemically functionalized nano graphene materials
View Patent ↗A combined production-functionalization process for producing a chemically functionalized nano graphene material from a pre-intercalated, oxidized, or halogenated graphite material, comprising: (A) Producing exfoliated graphite from the pre-intercalated, oxidized, or halogenated graphite material, wherein the graphite material is selected from the group consisting of natural graphite, artificial graphite, highly oriented pyrolytic graphite, carbon fiber, graphite fiber, carbon nano-fiber, graphitic nano-fiber, meso-carbon micro-bead, graphitized coke, and combinations thereof; (B) Dispersing the exfoliated graphite and an azide or bi-radical compound in a liquid medium to form a suspension; (C) Subjecting the suspension to ultrasonication with ultrasonic waves of a desired intensity for a length of time sufficient to produce nano graphene platelets and to enable a chemical reaction to occur between the nano graphene platelets and the azide or bi-radical compound to produce the functionalized nano graphene material.
1. A combined production-functionalization process for producing a chemically functionalized nano graphene material from a halogenated graphite material and an azide or bi-radical compound, comprising:
(A) Producing exfoliated halogenated graphite from said halogenated graphite material, wherein said graphite material is selected from the group consisting of carbon fiber, graphite fiber, carbon nano-fiber, graphitic nano-fiber, meso-carbon micro-bead, graphitized coke, and combinations thereof;
(B) Dispersing said exfoliated halogenated graphite and said azide or bi-radical compound in a liquid medium to form a suspension; and
(C) Subjecting said suspension to ultrasonication with ultrasonic waves of a desired intensity for a length of time sufficient to produce nano graphene platelets and to enable a chemical reaction to occur between said nano graphene platelets and said azide or bi-radical compound to produce said functionalized nano graphene material.
2. The process of claim 1 wherein said chemical reaction occurs only to an edge or edges of said nano graphene platelets.
3. The process of claim 1 wherein said chemical reaction occurs to an edge and at least one primary surface of said nano graphene platelets.
4. The process of claim 1 wherein said azide or bi-radical compound is selected from the group consisting of 2-Azidoethanol, 3-Azidopropan-1-amine, 4-(2-Azidoethoxy)-4-oxobutanoic acid, 2-Azidoethyl-2-bromo-2-methylpropanoate, chlorocarbonate, azidocarbonate, dichlorocarbene, carbene, aryne, nitrene, (R—)-oxycarbonyl nitrenes, where R=any one of the following groups,
and combinations thereof.
5. A combined production-functionalization process for producing a chemically functionalized nano graphene material from a halogenated graphite material and an azide or bi-radical compound, wherein said graphite material is selected from the group consisting of carbon fiber, graphite fiber, carbon nano-fiber, graphitic nano-fiber, meso-carbon micro-bead, graphitized coke, and combinations thereof; said process comprising:
(A) Dispersing said halogenated graphite material and the azide or bi-radical compound in a liquid medium to form a suspension;
(B) Subjecting said suspension to ultrasonication with ultrasonic waves of a desired intensity for a length of time sufficient to produce nano graphene platelets and to enable a chemical reaction to occur between said nano graphene platelets and said azide or bi-radical compound to produce said functionalized nano graphene material.
6. The process of claim 5 wherein said azide or bi-radical compound is added to said liquid medium sequentially after said direct ultrasonication of said graphite material is allowed to proceed for a desired period of time.
7. The process of claim 5 wherein said graphite material is selected from the group consisting of natural graphite, artificial graphite, highly oriented pyrolytic graphite, carbon fiber, graphite fiber, carbon nano-fiber, graphitic nano-fiber, meso-carbon micro-bead, graphitized coke, and combinations thereof.
8. The process of claim 5 wherein said chemical reaction occurs only to an edge or edges of said nano graphene platelets.
9. The process of claim 5 wherein said chemical reaction occurs to an edge and at least one primary surface of said nano graphene platelets.
10. The process of claim 5 wherein said azide compound is selected from the group consisting of 2-Azidoethanol, 3-Azidopropan-1-amine, 4-(2-Azidoethoxy)-4-oxobutanoic acid, 2-Azidoethyl-2-bromo-2-methylpropanoate, chlorocarbonate, azidocarbonate, dichlorocarbene, carbene, aryne, nitrene, (R—)-oxycarbonyl nitrenes, where R=any one of the following groups,
and combinations thereof.
11. The process of claim 5 , further comprising a step of grafting a polymer chain to a functional group of said functionalized nano graphene material to produce a polymer-grafted nano graphene material.
12. A combined production-functionalization process for producing a chemically functionalized nano graphene material from a halogenated graphite material, comprising:
(a) Producing exfoliated graphite from said halogenated graphite material, wherein said graphite material is selected from the group consisting of, carbon fiber, graphite fiber, carbon nano-fiber, graphitic nano-fiber, meso-carbon micro-bead, graphitized coke, and combinations thereof;
(b) Dispersing said exfoliated graphite and an azide or bi-radical compound in a liquid medium to form a suspension; and
(c) Subjecting said suspension to ultrasonication with ultrasonic waves of a desired intensity for a length of time sufficient to produce nano graphene platelets and to enable a chemical reaction to occur between said nano graphene platelets and said azide or bi-radical compound to produce said functionalized nano graphene material.