Title: Counterflow diffusion flame synthesis of ceramic oxide powders

Abstract

Ceramic oxide powders and methods for their preparation are revealed. Ceramic oxide powders are obtained using a flame process whereby one or more precursors of ceramic oxides are introduced into a counterflow diffusion flame burner wherein the precursors are converted into ceramic oxide powders. The nature of the ceramic oxide powder produced is determined by process conditions. The morphology, particle size, and crystalline form of the ceramic oxide powders may be varied by the temperature of the flame, the precursor concentration ratio, the gas stream and the gas velocity.

Inventors:

Katz, Joseph L ^[1]; Miquel, Philippe F ^[2]

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1. Baltimore, MD
2. Towson, MD

Issue Date:

Wed Jan 01 00:00:00 EST 1997

Research Org.:

Johns Hopkins University (Baltimore, MD)

OSTI Identifier:

871058

Patent Number(s):

5650130

Application Number:

08/466787

Assignee:

Johns Hopkins University (Baltimore, MD)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B - PERFORMING OPERATIONS B82 - NANOTECHNOLOGY B82Y - SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J12/02 - for obtaining at least one reaction product which, at normal temperature, is in the solid state
B01J37/088 - {Decomposition of a metal salt}
B01J37/349 - {making use of flames, plasmas or lasers}

B - PERFORMING OPERATIONS B82 - NANOTECHNOLOGY B82Y - SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES

B82Y30/00 - Nanotechnology for materials or surface science, e.g. nanocomposites

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C01B13/20 - by oxidation of elements in the gaseous state
C01B13/24 - in the presence of hot combustion gases

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F

C01G23/07 - Producing by vapour phase processes, e.g. halide oxidation

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

C01P2002/72 - by d-values or two theta-values, e.g. as X-ray diagram
C01P2002/82 - by IR- or Raman-data
C01P2004/04 - obtained by TEM, STEM, STM or AFM
C01P2004/50 - Agglomerated particles
C01P2004/64 - Nanometer sized, i.e. from 1-100 nanometer
C01P2006/12 - Surface area

C - CHEMISTRY C03 - GLASS C03B - MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES

C03B19/102 - {by blowing a gas onto a stream of molten glass or onto particulate materials, e.g. pulverising}
C03B19/106 - {by chemical vapour deposition

C - CHEMISTRY C03 - GLASS C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS

C03C13/046 - {Multicomponent glass compositions}

C - CHEMISTRY C09 - DYES C09C - TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES

C09C1/3653 - {Treatment with inorganic compounds}
C09C1/3661 - {Coating}

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DOE Contract Number:  

FG02-88ER45356

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

counterflow; diffusion; flame; synthesis; ceramic; oxide; powders; methods; preparation; revealed; obtained; process; whereby; precursors; oxides; introduced; burner; converted; nature; powder; produced; determined; conditions; morphology; particle; size; crystalline; form; varied; temperature; precursor; concentration; ratio; gas; stream; velocity; process conditions; concentration ratio; ceramic oxides; process whereby; gas stream; particle size; oxide powder; ceramic oxide; oxide powders; gas velocity; crystalline form; counterflow diffusion; diffusion flame; flame synthesis; flame process; flow diffusion; /423/264/419/501/