Nanostructured multi-component and doped oxide powders and method of making same
First Claim
1. A method of producing nanostructured multi-component or doped oxide particles, comprising the following steps:
- a. proportioning the salts of cations, which are either dopants or components of the final oxide, and a dispersion of nanoparticles of a single component oxide so as to form the proportions of the desired multi-component or doped oxide particles;
b. dissolving the salts of cations, in an liquid organic solvent;
c. adding the dispersion of nanoparticles of the single component oxide to the liquid solution;
d. heating the liquid solution to facilitate diffusion of cations into the nanoparticles;
e. separating the solids from the liquid solution; and
f. heat treating the solids to form the desired crystal structure.
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Abstract
A method for producing nanostructured multi-component or doped oxide particles and the particles produced therein. The process includes the steps of (i) dissolving salts of cations, which are either dopants or components of the final oxide, in an organic solvent; (ii) adding a dispersion of nanoparticles of a single component oxide to the liquid solution; (iii) heating the liquid solution to facilitate diffusion of cations into the nanoparticles; (iv) separating the solids from the liquid solution; and (v) heat treating the solids either to form the desired crystal structure in case of multi-component oxide or to render the homogeneous distribution of dopant cation in the host oxide structure. The process produces nanocrystalline multi-component or doped oxide nanoparticles with a particle size of 5–500 nm, more preferably 20–100 nm; the collection of particles have an average secondary (or aggregate) particle size is in the range of 25–2000 nm, preferably of less than 500 nm.
72 Citations
22 Claims
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1. A method of producing nanostructured multi-component or doped oxide particles, comprising the following steps:
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a. proportioning the salts of cations, which are either dopants or components of the final oxide, and a dispersion of nanoparticles of a single component oxide so as to form the proportions of the desired multi-component or doped oxide particles; b. dissolving the salts of cations, in an liquid organic solvent; c. adding the dispersion of nanoparticles of the single component oxide to the liquid solution; d. heating the liquid solution to facilitate diffusion of cations into the nanoparticles; e. separating the solids from the liquid solution; and f. heat treating the solids to form the desired crystal structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of producing a collection of multi-component or doped oxide nanoparticles, wherein the average primary particle size of the nanoparticles is in the range of 5–
- 500 nm, and the average aggregate particle size is in the range of 25–
2000 nm, the method comprising the following steps;a. providing the salts of cations, which are either dopants or components of the final oxide; b. providing a dispersion of nanoparticles of a single component oxide; c. proportioning the salts of cations and the dispersion of nanoparticles so as to form the proportions of the desired multi-component or doped oxide particles; d. dissolving the salts of cations in an liquid organic solvent; e. adding the dispersion of nanoparticles of the single component oxide to the liquid solvent solution; f. heating the liquid solution to facilitate diffusion of the cations into the nanoparticles; g. separating the solids from the liquid solution; and h. heat treating the solids to form the desired crystal structure of the final oxide. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
- 500 nm, and the average aggregate particle size is in the range of 25–
Specification