Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation

Harris, Michael T; Basaran, Osman A; Sisson, Warren G; Brunson, Ronald R

Title: Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation

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Abstract

The present invention provides a method for preparing irreversible linear aggregates (fibrils) of metal oxide powders by utilizing static or pulsed DC electrical fields across a relatively non-conducting liquid solvent in which organometal compounds or silicon alkoxides have been dissolved. The electric field is applied to the relatively non-conducting solution throughout the particle formation and growth process promoting the formation of either linear aggregates (fibrils) or spherical shaped particles as desired. Thus the present invention provides a physical method for altering the size, shape and porosity of precursor hydrous metal oxide or hydrous silicon oxide powders for the development of advanced ceramics with improved strength and insulating capacity.

Inventors:

Harris, Michael T ^[1]; Basaran, Osman A ^[2]; Sisson, Warren G ^[2]; Brunson, Ronald R ^[3]

Knoxville, TN
Oak Ridge, TN
Lenoir City, TN

Issue Date:: 1997-01-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

OSTI Identifier:: 870836

Patent Number(s):: 5603819

Assignee:: Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)

Patent Classifications (CPCs):: C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

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

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C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C01B33/18 - Preparation of finely divided silica neither in sol nor in gel form

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
C01P2004/50 - Agglomerated particles
C01P2004/03 - obtained by SEM

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C01B13/32 - by oxidation or hydrolysis of elements or compounds in the liquid or solid state {or in non-aqueous solution, e.g. sol-gel process}

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
C01P2004/10 - extending in one dimension, e.g. needle-like

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DOE Contract Number:: AC05-84OR21400

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: variation; shape; morphological; properties; silica; metal; oxide; powders; electro; homogeneous; precipitation; provides; method; preparing; irreversible; linear; aggregates; fibrils; utilizing; static; pulsed; dc; electrical; fields; relatively; non-conducting; liquid; solvent; organometal; compounds; silicon; alkoxides; dissolved; electric; field; applied; solution; throughout; particle; formation; growth; process; promoting; spherical; shaped; particles; desired; physical; altering; size; porosity; precursor; hydrous; advanced; ceramics; improved; strength; insulating; capacity; particle formation; particle form; conducting liquid; advanced ceramics; growth process; electrical fields; spherical shape; electrical field; metal compound; metal compounds; electric field; metal oxide; silicon oxide; liquid solvent; oxide powder; oxide powders; hydrous metal; improved strength; homogeneous precipitation; shaped particles; insulating capacity; spherical shaped; dc electric; /205/

Citation Formats


                    Harris, Michael T, Basaran, Osman A, Sisson, Warren G, and Brunson, Ronald R. Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation.  United States: N. p., 1997. 
        Web.

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                    Harris, Michael T, Basaran, Osman A, Sisson, Warren G, & Brunson, Ronald R. Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation.  United States.

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                    Harris, Michael T, Basaran, Osman A, Sisson, Warren G, and Brunson, Ronald R. Wed .  
        "Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation".  United States.  https://www.osti.gov/servlets/purl/870836.

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@article{osti_870836,

  title        = {Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation},

  author       = {Harris, Michael T and Basaran, Osman A and Sisson, Warren G and Brunson, Ronald R},

  abstractNote = {The present invention provides a method for preparing irreversible linear aggregates (fibrils) of metal oxide powders by utilizing static or pulsed DC electrical fields across a relatively non-conducting liquid solvent in which organometal compounds or silicon alkoxides have been dissolved. The electric field is applied to the relatively non-conducting solution throughout the particle formation and growth process promoting the formation of either linear aggregates (fibrils) or spherical shaped particles as desired. Thus the present invention provides a physical method for altering the size, shape and porosity of precursor hydrous metal oxide or hydrous silicon oxide powders for the development of advanced ceramics with improved strength and insulating capacity.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1997},

  month        = {1}

}

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