Microemulsion method for producing activated metal oxide nanocry

Details Microemulsion method for producing activated metal oxide nanocry Microemulsion method for producing activated metal oxide nanocry

1998-07-29

2000-03-14

Koslow, C. Melissa

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

423243, 423592, 423593, C01G 102

Patent

active

060368861

ABSTRACT:
A process for the production of metal oxide nanocrystals activated with a rare earth element, which are useful as phosphors. The nanocrystal oxides are produced by a micellar microemulsion process. In the process an aqueous solutions of the host and activator is prepared and added to a mixture of oil and a micelle forming surfactant and cosurfactant to form a first water in oil microemulsion. An aqueous solution of a hydroxide containing compound is added to a second mixture of oil and a micelle forming surfactant and cosurfactant to form a second water in oil microemulsion. The two microemulsions are added together which cause the micelle units to coalesce and decoalesce and to form a nanocrystalline hydroxide compound of the host and activator. The solution is washed and treated so as to remove byproducts. Thereafter the hydroxide compound is converted to an nanocrystalline activated oxide.

REFERENCES:
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patent: 5770172 (1998-06-01), Linehan et al.
Pillai et al, "Magnetic Properties of Barium Ferrite Synthesized Using a Microemulsion Mediated Process", Jour. Mag. and Mag. Matl., 116, L299-304, 1992 no month.

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