Cabot Corporation

Sheldon B Davis

Yakov E Kutsovsky

Angelica M Sanchez Garcia

David M Matheu

Gregory T Gaudet

William L Sifleet

Francois M Terrade

Francois Marie Terrade

The invention provides fumed silica comprising aggregates that have an aggregate size and a surface area that satisfy particular formulas relating aggregate size to surface area, as well as aggregates that exhibit particular viscosity, power law exponent index, and/or elastic modulus characteristics when dispersed in liquid media. The invention also provides processes of preparing such fumed silica by combining a silica precursor with a stream of combustible gas, combusting the stream, and producing a stream of combusted gas and fumed silica particles, wherein dopants are introduced, the time/temperature profile, or history, of the stream of combusted gas and fumed silica particles is adjusted to allow for post-quench aggregate growth, and/or additional silica precursor is introduced into the stream of combusted gas.

Fumed silica of controlled aggregate size and processes for manufacturing the same

Methods of producing carbon black in a multi-stage reaction are described. Also described is carbon black formed from the processes.

Carbon black and multi-stage process for making same

The inventive method of producing silicon comprises reacting gaseous trichlorosilane with hydrogen to deposit silicon onto a substrate and to produce silicon tetrachloride by-product, vaporizing the silicon tetrachloride by-product to form gaseous silicon tetrachloride, converting the gaseous silicon tetrachloride to finely divided silicon, forming a silicon melt by melting the finely divided silicon, and forming solid silicon from the silicon melt.

Production of silicon through a closed-loop process

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Nashua, NH, United States of America

Sheldon B Davis