University of Cincinnati

Lucent Technologies Inc.

Universität Karlsruhe

Srinivas Vemury

Sotiris Emmanuel Pratsinis

Andreas Gutsch

George P Fotou

Peter Michael Mueller

A method and apparatus for maintaining the pressure in an overclad tube at a reduced level despite axial movement of the tube during performance of an RIT overcladding operation. The overcladding tube is held by means of the lathe chuck, and a tubular extension of a rotary union member extends into the tube. The distal end of the extension has a sealing member replaceably mounted thereon which forms a seal with the interior wall of the tube. A vacuum source thus is enabled to connect to the interior of the overcladding tube through the rotary union, the extension tube, and the seal.

Method and apparatus for overcladding a glass rod

The present invention related to methods of manufacturing oxide, nitride, carbide, and boride powders and other ceramic, organic, metallic, carbon and alloy powders and films and their mixtures having well-controlled size and crystallinity characteristics. This invention relates, more particularly, to a development in the synthesis of the ceramic, metallic, composite, carbon and alloy nanometer-sized particles with precisely controlled specific surface area, or primary particle size, crystallinity and composition. The product made using the process of the present invention and the use of that product are also claimed herein.

Electrically assisted synthesis of particles and film with precisely controlled characteristic

A gas phase process for the production of titanium dioxide powders having well-controlled crystalline and surface area characteristics is disclosed. In this process, which is preferably carried out in a laminar diffusion flame reactor, vapor phase TiCl.sub.4 and oxygen are mixed in a reaction area which is heated externally. The titanium dioxide powder formed is then collected. It is preferred that the heat source used be a hydrocarbon fueled (e.g., methane) flame. Optionally, a vapor phase dopant (such as SiCl.sub.4) may be added to the reaction mixture to desirably affect the physical properties of the titanium dioxide produced. In a particularly preferred embodiment, a corona electric field is positioned across the area where the combustion reaction takes place (i.e., the reaction area). High anatase, high surface area titanium dioxide powders made by this process are excellent photocatalysts. The products of this process and the use of those products as photocatalysts are also disclosed. This process is also useful for producing other ceramic powders (such as silicon dioxide and tin oxide), as well as pure metallic or alloy powders.

Vapor phase flame process for making ceramic particles using a corona

Process for producing ceramic powders, especially titanium dioxide

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Duluth, GA, United States of America

Srinivas Vemury