Stabilization of hexagonal boron nitride nanoparticles

Patent metadata

Field	Value
Publication number	US-2016168442-A1
Application number	US-201414571199-A
Country	US
Kind code	A1
Filing date	Dec 15, 2014
Priority date	Dec 15, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A composition includes a continuous phase of water, alcohol, or a mixture of water and alcohol; hexagonal boron nitride nanoparticles dispersed in the continuous phase; and a compound having a formula (I)

or a salt thereof, wherein n is an integer between 50 and 200 and y is an integer between 20 and 200.

First claim

What is claimed is:

1 . A composition, comprising:
a continuous phase selected from the group consisting of water, alcohol, and a mixture of water and alcohol; hexagonal boron nitride nanoparticles dispersed in the continuous phase; and a compound having a formula (I)

or a salt thereof, wherein n is an integer between 50 and 200 and y is an integer between 20 and 200.

2 . The composition according to claim 1 , wherein n is an integer between 80 and 120 and y is an integer between 50 and 75.

3 . The composition according to claim 1 , wherein n is 100 and y is 65.

4 . The composition according to claim 1 , wherein the hexagonal boron nitride nanoparticles have an average sheet height between about 5 nm and about 20 nm and an average sheet radius between about 50 nm and about 350 nm.

5 . The composition according to claim 1 , wherein the hexagonal boron nitride nanoparticles have an average diameter between about 50 nm and about 350 nm and an average height between about 5 nm and about 20 nm.

6 . The composition according to claim 1 , wherein the continuous phase is water and ethylene glycol.

7 . The composition according to claim 1 , wherein the continuous phase is water and ethylene glycol in a ratio of 50/50 vol %.

8 . The composition according to claim 1 , wherein the composition further comprises an additive.

9 . The composition according to claim 8 , wherein the additive is selected from the group consisting of an alkali metal salt as a freezing point depressant, a corrosion inhibitor, a scale inhibitor, a stabilizer, an antioxidant, a buffer, a de-foamer, a dye, and mixtures thereof.

10 . The composition according to claim 9 , wherein the corrosion inhibitor is selected from the group consisting of an aliphatic carboxylic acid or a salt thereof, an aromatic carboxylic acid or a salt thereof, a triazole, a thiazole, a silicate, a nitrate, a nitrite, a borate, a phosphate molybdate, an amine salt, and mixtures thereof.

11 . The composition according to claim 9 , wherein the corrosion inhibitor is present in the composition in a concentration between about 0.2 wt % and about 10 wt %.

12 . The composition according to claim 1 , wherein the composition is stable for 12 hours at room temperature.

13 . The composition according to claim 1 , wherein the composition is stable for 12 hours at a temperature between about room temperature and about 85° C.

14 . The composition according to claim 1 , wherein the hexagonal boron nitride nanoparticles are present in the composition in a concentration between about 0.0001 vol % and about 10 vol %.

15 . The composition according to claim 14 , wherein the hexagonal boron nitride nanoparticles are present in the composition in a concentration between about 0.005 vol % and about 0.5 vol %.

16 . The composition according to claim 15 , wherein the hexagonal boron nitride nanoparticles are present in the composition in a concentration between about 0.05 vol % and about 0.2 vol %.

17 . The composition according to claim 1 , wherein the compound having the formula (I) is present in the composition in a concentration between about 0.0001 vol % and about 1 vol %.

18 . The composition according to claim 17 , wherein the compound having the formula (I) is present in the composition in a concentration between about 0.2 vol % and about 0.7 vol %.

19 . The composition according to claim 1 , wherein the continuous phase is water.

20 . A method of exchanging heat, comprising:
a. generating heat in an automotive internal combustion engine; b. passing a stream through one side of a heat exchanger; c. passing a composition through another side of the heat exchanger; and d. transferring the heat from the stream to the composition in the heat exchanger,
wherein the composition comprises:
a continuous phase selected from the group consisting of water, alcohol, and a mixture of water and alcohol;
hexagonal boron nitride nanoparticles dispersed in the continuous phase; and
a compound having a formula (I)

or a salt thereof, wherein n is an integer between 50 and 200 and y is an integer between 20 and 200.

Assignees

• Lievens Serge
• Radojcic Vera
• Agarwal Sandip
• Fuerstman Michael
• Chevron Usa Inc

Inventors

• Lievens Serge
• Radojcic Vera
• Agarwal Sandip
• Fuerstman Michael

Classifications

• C09K5/10 Primary

  Liquid materials · CPC title

• C09K5/20 Primary

  Antifreeze additives therefor, e.g. for radiator liquids (for application to surfaces C09K3/18; inhibiting corrosion by liquids C23F11/00) · CPC title