Liquid feed flame spray modification of nanoparticles
AssigneeThe Regents of the University of Michigan
InventorsRichard M. Laine, Julien Marchal, José Azurdia, Roy Rennesund
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Abstract
Nano- and micron sized metal oxide and mixed metal oxide particles are injected into a high temperature region wherein the temperature is between about 400° C. and less than 2000° C., and collected as particles or as coatings wherein a particulate nature is substantially maintained. The particles are altered in at least one of phase, morphology, composition, and particle size distribution, and may achieve further changes in these characteristics by coinjection of metal oxide precursor in liquid form.
Claims14
A process for the modification of particles comprising metal oxide and mixed metal oxides having a number average particle size of less than 100 μm, comprising:
- a) injecting preformed particles in a flow of suspending medium through a high temperature zone having a temperature greater than 400° C. and less than 2000° C.;
- b) optionally coinjecting a liquid composition comprising one or more metal oxide precursor compounds;
- c) rapidly quenching the particles to obtain product particles or coatings of product particles wherein at least one of composition, phase, morphology, particle size, or particle size distribution is modified.
A process for the modification of particles comprising metal oxide and mixed metal oxides having a number average particle size of less than 100 μm, comprising:
- a) injecting preformed particles in a flow of suspending medium through a high temperature zone having a temperature greater than 400° C. and less than 2000° C.;
- b) coinjecting a liquid composition comprising one or more metal oxide precursor compounds;
- c) rapidly quenching the particles to obtain product particles or coatings of product particles wherein at least one of composition, phase, morphology, particle size, or particle size distribution is modified.
A process for the modification of particles comprising metal oxide and mixed metal oxides having a number average particle size of less than 100 μm, comprising:
- a) injecting preformed particles in a flow of suspending medium through a high temperature zone having a temperature greater than 400° C. and less than 2000° C.;
- b) optionally coinjecting a liquid composition comprising one or more metal oxide precursor compounds;
- c) rapidly quenching the particles to obtain product particles or coatings of product particles wherein at least one of composition, phase, morphology, particle size, or particle size distribution is modified, wherein the preformed particles are of γ-alumina, δ-alumina, θ-alumina, or mixtures thereof, and the particles collected in step c) are α-alumina or are enriched with α-alumina relative to the α-alumina content of the preformed particles.
A process for the modification of particles comprising metal oxide and mixed metal oxides having a number average particle size of less than 100 μm, comprising:
- a) injecting preformed particles in a flow of suspending medium through a high temperature zone having a temperature greater than 400° C. and less than 2000° C.;
- b) optionally coinjecting a liquid composition comprising one or more metal oxide precursor compounds;
- c) rapidly quenching the particles to obtain product particles or coatings of product particles wherein at least one of composition, phase, morphology, particle size, or particle size distribution is modified, wherein the preformed particles comprise particles of clay or ash.
Dependencies are inferred from the claim text.