Coated chloride salt particles and methods of making and using the same

Patent metadata

Field	Value
Publication number	US-11504687-B2
Application number	US-201716341204-A
Country	US
Kind code	B2
Filing date	Oct 11, 2017
Priority date	Oct 11, 2016
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

Described herein are coated chloride salt particles, including NaCl/TiO2 and NaCl/SiO2 core/shell particles, along with methods of making and using the same.

First claim

That which is claimed is:

1. A method of preparing core-shell particles, the method comprising:
suspending chloride salt particles in an organic solvent to provide a suspension, each of the chloride salt particles including an innermost portion formed of chloride salt;
preparing a titanium dioxide or silicon dioxide sol-gel composition by hydrolysis of a titanium butoxide or tetraethyl orthosilicate solution; and
adding the titanium dioxide or silicon dioxide sol-gel composition to the suspension to form a mixture comprising core-shell particles having a chloride salt core and a titanium dioxide or silicon dioxide shell, thereby preparing the core-shell particles.

2. The method of claim 1 , wherein the chloride salt particles are suspended in the organic solvent for about 10 minutes to about 60 minutes.

3. The method of claim 1 , wherein the organic solvent is an alcohol.

4. The method of claim 1 , wherein the sol gel has a pH of about 2 or less.

5. The method of claim 1 , further comprising:
filtering the mixture to remove the core-shell particles from the mixture;
drying the suspension and/or core-shell particles; and
calcining the core-shell particles at a temperature in a range of about 200° C. to about 300° C. for at least 1 hour.

6. The method of claim 1 , wherein the chloride salt particles comprise sodium chloride salt particles.

7. The method of claim 1 , wherein the organic solvent comprises one or more of an alcohol and ketone.

8. The method of claim 1 , wherein the organic solvent comprises 2-propanol.

9. A method of preparing core-shell particles, the method comprising:
adding a sodium chloride solution to a first organic solvent;
mixing the sodium chloride solution and the first organic solvent to form a mixture comprising a precipitate of sodium chloride particles;
suspending the sodium chloride particles in a second organic solvent to form a suspension; and
adding a titanium dioxide composition to the suspension to coat the sodium chloride particles with a titanium dioxide layer and form core-shell particles with a sodium chloride core and a titanium dioxide shell.

10. The method of claim 9 , wherein the first organic solvent is an alcohol.

11. The method of claim 9 , wherein the second organic solvent is an alcohol.

12. The method of claim 9 wherein the first organic solvent and the second organic solvent is 2-propanol.

13. The method of claim 9 wherein the titanium dioxide shell of the core-shell particles has a thickness in a range of about 1 nm to about 50 nm.

14. The method of claim 9 wherein the sodium chloride core of the core-shell particles has a cubic size in a range of about 500 nm to about 800 nm.

15. A method of preparing core-shell particles, the method comprising:
suspending chloride salt particles in an organic solvent to provide a suspension, the chloride salt particles comprising sodium chloride salt particles; and
adding a titanium dioxide or silicon dioxide composition to the suspension to form a mixture comprising core-shell particles, thereby preparing the core-shell particles.

Assignees

• Univ Khalifa Science & Technology
• Nat Center Of Meteorology

Inventors

• Zou Linda Yuan
• Jouiad Mustapha
• Zaki Abdelali
• El Hadri Nabil
• Liang Haoran

Classifications

• C01P2004/03

  obtained by SEM · CPC title

• A01G15/00

  Devices or methods for influencing weather conditions · CPC title

• C01P2004/84

  one phase coated with the other · CPC title

• B01J13/02 Primary

  Making microcapsules or microballoons {(for medical preparations A61K9/50)} · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title