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US 6,413,489 B1Granted
Synthesis of nanometer-sized particles by reverse micelle mediated techniques
AssigneeMassachusetts Institute of Technology
InventorsJackie Y. Ying, Andrey Zarur
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Abstract
The present invention relates to a method of producing particles having a particle size of less than 100 nm and surface areas of at least 20 m2/g where the particles are free from agglomeration. The method involves synthesizing the particles within an emulsion having a 1-40% water content to form reverse micelles. In particular, the particles formed are metal oxide particles. The particles can be used to oxidize hydrocarbons, particularly methane.
Claims28
A method comprising:
- introducing a water-reactive reactant comprising a ceramic precursor including barium alkoxide and aluminum alkoxide in the presence of a reverse emulsion;
- effecting a reaction;
- and
- recovering a material from the reaction having an average particle size of less than about 100 nm wherein the material, upon exposure to 700° C. for at least about 10 min., retains a surface area of at least about 100 m2/g.
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A method for preparing a particle, comprising:
- providing an emulsion including a hydrocarbon, at least one surfactant and a water content of about 1-40% to form reverse micelles, the reverse micelles comprising a disperse aqueous phase;
- adding water-reactive reactants comprising barium alkoxide and aluminum alkoxide;
- and
- allowing the water-reactive reactants to react in and with the disperse aqueous phase to form a particle having a particle size of less than about 100 nm, the particle being free from agglomeration.
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Dependencies are inferred from the claim text.