Method for producing a directed aerosol stream

US4610892A · kind A · utility

Assignee

• Licentia Patent-Verwaltungs-GmbH · DE

Inventors

• Dietrich Eisbrenner · Ulm, DE
• Hans Merk · Radolfzell, DE

Key dates

• Filing date: Sep 20, 1985
• Grant date: Sep 9, 1986
• Expiry date: Sep 20, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2201/12
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for producing a directed aerosol stream from gaseous and/or vapor phase reactants by conveying the gaseous and/or vapor phase reactants including vaporous silicon tetrachloride, water vapor, and at least one vaporous, fluorine-containing hydrocarbon to a reaction site; reacting the reactants at the reaction site in a flame-free chemical reaction to produce an aerosol composition constituted of solid silicon dioxide particles which include silicon dioxide doped with fluorine, whereby the optical index of refraction of the solid silicon dioxide particles is reduced; and causing the aerosol composition to flow as an aerosol stream from the reaction site and immediately surrounding the aerosol stream with a moving, essentially aerosol-free, gas and/or vapor stream to form a directed aerosol stream enveloped in the aerosol-free stream.