Production of graphene nanoplatelets by oxidative anhydrous acidic media
US-2015360956-A1 · Dec 17, 2015 · US
Method for manufacturing graphene balls
US10822237B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10822237-B2 |
| Application number | US-201716306247-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 14, 2017 |
| Priority date | Jun 1, 2016 |
| Publication date | Nov 3, 2020 |
| Grant date | Nov 3, 2020 |
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Abstract
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Such graphene can be applied to various fields due to excellent physical and chemical characteristics.
First claim
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What is claimed is: 1. A method for preparing graphene balls comprising, a) preparing a dispersion which includes, a graphene oxide, a reducing agent ranging from a monosaccharide to a polysaccharide, and an ammonia aqueous solution, wherein the ammonia aqueous solution contains 20 to 35% by weight of the ammonia, and wherein the dispersion contains 1 to 10% by weight of the ammonia aqueous solution; and b) spraying and drying the dispersion, wherein the sphericalness of the graphene balls is Equation 1: 1 ≤ d long d short ≤ 1.5 [ Equation 1 ] where, d short is the shortest diameter of a graphene ball, and d long is the longest diameter of the graphene ball. 2. The method of claim 1 , wherein the step a) comprises, a1) preparing a first dispersion which includes a graphene oxide and a reducing agent ranging from a monosaccharide to a polysaccharide; and a2) mixing the first dispersion with an ammonia aqueous solution to prepare a second dispersion. 3. The method of claim 1 , wherein the reducing agent ranging from a monosaccharide to a polysaccharide is one or more selected from a group consisting of glucose, fructose, galactose, sucrose, maltose and lactose. 4. The method of claim 1 , wherein the dispersion contains 0.1 to 2% by weight of the graphene oxide. 5. The method of claim 1 , wherein the dispersion contains 0.3 to 3% by weight of the reducing agent. 6. The method of claim 2 , wherein the step a2) is performed at 80 to 100° C. for 30 minutes to 2 hours. 7. The method of claim 1 , wherein the step b) is performed at 150 to 250° C. 8. The method of claim 1 , further comprising, drying at 50 to 70° C. for 12 to 48 hours after the step b).
Assignees
Inventors
Classifications
- C01B32/192Primary
starting from graphitic oxides · CPC title
After-treatment · CPC title
Spheres · CPC title
Manufacture or treatment of nanostructures · CPC title
by IR- or Raman-data · CPC title
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Frequently asked questions
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- What does patent US10822237B2 cover?
- Such graphene can be applied to various fields due to excellent physical and chemical characteristics.
- Who is the assignee on this patent?
- Korea Inst Geoscience & Mineral Resources
- What technology area does this patent fall under?
- Primary CPC classification C01B32/192. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 03 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).