High purity nanoscale metal oxide powders and methods to produce such powders
First Claim
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1. A method for producing high purity metal oxide powder comprising:
- providing a feed comprising a precursor with a purity greater than 99.9% on metal basis;
suspending the feed in a gas in a mixing apparatus to create a gas-stream suspension, whereafter the gas-stream suspension is fed to a thermal reactor;
a first step wherein the feed suspended in a gas is processed at a temperature greater than 2000°
C. in the thermal reactor thereby producing a stream comprising vapor;
a second step wherein the stream comprising vapor is provided thermokinetic conditions such that it forms a stream comprising high purity metal oxide powder with a purity greater than 99.9% on metal basis; and
a third step wherein the stream comprising high purity metal oxide powder is quenched.
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Abstract
A method of producing high purity nanoscale powders in which the purity of powders produced by the method exceeds 99.99%. Fine powders produced are of size preferably less than 1 micron, and more preferably less than 100 nanometers. Methods for producing such powders in high volume, low-cost, and reproducible quality are also outlined. The fine powders are envisioned to be useful in various applications such as biomedical, sensor, electronic, electrical, photonic, thermal, piezo, magnetic, catalytic and electrochemical products.
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Citations
26 Claims
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1. A method for producing high purity metal oxide powder comprising:
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providing a feed comprising a precursor with a purity greater than 99.9% on metal basis; suspending the feed in a gas in a mixing apparatus to create a gas-stream suspension, whereafter the gas-stream suspension is fed to a thermal reactor; a first step wherein the feed suspended in a gas is processed at a temperature greater than 2000°
C. in the thermal reactor thereby producing a stream comprising vapor;a second step wherein the stream comprising vapor is provided thermokinetic conditions such that it forms a stream comprising high purity metal oxide powder with a purity greater than 99.9% on metal basis; and a third step wherein the stream comprising high purity metal oxide powder is quenched. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for producing high purity metal oxide powder comprising:
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providing a plasma; providing a feed comprising a precursor with a purity greater than 99.9% on metal basis; suspending the feed in a gas comprising oxygen; a step wherein the feed suspended in a gas comprising oxygen is processed in the plasma thereby producing a stream comprising vapor; step wherein the stream comprising vapor is formed into a stream comprising high purity metal oxide nanopowder with a purity greater than 99.9% on metal basis; and an additional step wherein the stream comprising high purity metal oxide powder is quenched. - View Dependent Claims (23, 24, 25, 26)
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Specification