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US 9,540,245 B1Granted
Method for systhesizing nanodiamonds
AssigneeKuwait Institute for Scientific Research
InventorMohamed Sherif Mohamed Mostafa El-Eskandarany
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Abstract
A method for synthesizing nanodiamonds includes high energy ball milling of graphite powder for a period of at least 52 hours at a rotation speed of about 400 rotations per minute to produce nanodiamonds. The ball milling can occur in an inert atmosphere at ambient pressure and room temperature. The nanodiamonds can have a spherical morphology and a particle size distribution ranging from about 1 nanometer to about 10 nanometers.
Claims13
A method for synthesizing nanodiamonds, consisting of:
- disposing graphite powder in a ball milling container, the ball milling container including a plurality of milling balls and having an inert atmosphere therein;
- disposing the ball milling container including the graphite powder in a ball mill;
- operating the ball mill for a first period of time to achieve high-energy collision of the plurality of balls with the graphite powder in the container, the high energy collision occurring in the first period of time producing a first product powder including nanodiamonds, wherein the high energy collision occurs at ambient pressure and room temperature;
- disposing the first product powder in a high-pressure ball milling container;
- pressurizing the high-pressure ball milling container with H2 gas wherein the high-pressure ball milling container is pressurized to a pressure of about 50 bar;
- disposing the ball milling container including the first product powder in the ball mill;
- and
- operating the ball mill for a second period of time to achieve high-energy collision of the plurality of balls with the first product powder in the container, the high energy collision occurring in the second period of time producing a second product powder.
5 more elements
Dependencies are inferred from the claim text.