Nanosize metal oxide particles for producing transparent metal oxide colloids and ceramers
First Claim
1. Inorganic particles capable of being combined with at least one transparent organic composition without substantially diminishing the transparency thereof comprising:
- (a) titanium based oxide particles having a dispersing aid attached thereto and having a degree of crystallinity of greater than 55 percent;
(b) a crystallite diameter greater than about 4 nanometers and less than about 20 nanometers; and
(c) an absorptivity of less than about 3.00 as a colloid.
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Abstract
The present invention relates to metal oxide particles capable of being highly dispersed in organic materials to form transparent colloids and ceramers. The metal oxide particles of the present invention have surfaces attached to a dispersing aid and a degree of crystallinity of greater than 55 percent. The crystallite diameter of the metal oxide particles is greater than about 4 nanometers and less than about 20 nanometers. The present invention also relates to the colloids and ceramers prepared using these metal oxide particles and the methods associated with the preparation of the particles, colloids, and ceramers.
295 Citations
23 Claims
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1. Inorganic particles capable of being combined with at least one transparent organic composition without substantially diminishing the transparency thereof comprising:
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(a) titanium based oxide particles having a dispersing aid attached thereto and having a degree of crystallinity of greater than 55 percent;
(b) a crystallite diameter greater than about 4 nanometers and less than about 20 nanometers; and
(c) an absorptivity of less than about 3.00 as a colloid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of making dispersible crystalline metal oxide nanoparticles, comprising the steps of:
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(a) providing a metal alkoxide;
(b) reacting the metal alkoxide with a substoichiometric amount of a complexing agent;
(c) partially hydrolyzing the product of step (b) by the addition of substoichiometric amounts of water; and
(d) thermally treating the partially hydrolyzed mixture by heating under pressure at a temperature in the range of about 150°
C. to about 265°
C. for an amount of time sufficient to form crystalline particles having a crystallite diameter greater than about 4 nanometers and less than about 20 nanometers and having a degree of crystallinity greater than 55 percent.- View Dependent Claims (20, 21, 22, 23)
(e) combining the crystalline particles with an organic solvent to form a mixture; and
(f) combining the mixture with a dispersing aid to form metal oxide particles that are dispersible in organic solvent.
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22. The method of claim 21, wherein the dispersing aid is combined with the particles prior to the introduction of additional water.
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23. The method of claim 21, wherein the method is free of a seed.
Specification