Degussa Novara Technology S.p.a.

Novara Technology S.r.l.

Evonik Degussa Gmbh

N Vara Technology S.r.l.

Fulvio Costa

Lorenzo Costa

Pier Paolo Costa

Matteo Crepaldi

Pierpaolo Costa

Lucia Gini

Daniele Fregonese

An optical article, having an almost complete isotropy and dimensions equal to or lower than 500 .mu.m, is prepared by a sol-gel procedure comprising a preliminary step wherein the mould is filled cold with a sol containing the desired oxide precursors, sol gelation, gel drying, removal of the gel from the mould and the subsequent miniaturization of the dried gel. The optical article can be used for optic telecommunications.

Optical articles and sol-gel process for their manufacture

Process for the preparation and the deposition of vitreous films on substrates comprising: the dissolution of one or more metal alkoxides in aprotic solvent, the hydrolysis of the resulting solution, the eventual removal of the formed alcohol, the deposition of the resulting sol on the substrate surface of interest and the final drying of the film.

SOL-GEL process for the preparation of vitreous films possessing high adhesion properties and stable colloidal solutions

A method for the preparation of aerogels that involves the exchange of the liquid present in the aquagel with xenon and the subsequent extraction thereof.

Method for the preparation of aerogels

It is described a process based on sol-gel chemistry suitable to the production of nanocomposite materials being photoluminescent at ambient temperature, comprising silicon grains of dimension of nanometers embedded in a silica matrix.

Sol-gel process for the manufacture of nanocomposite photoluminescent materials and materials thus produced

Sol-gel process for the production of optical fiber preforms or overcladdings by preparing a sol, gelling the sol, drying the wet gel to a dry porous gel and densifying the dry gel to fully dense glass, wherein during the calcination treatment from 350&#xb0; C. to 900&#xb0; C. to remove organic impurities in the dry gel, it is carried out at least one reduced-pressure phase at a pressure comprised between about 0.01 and 0.5 bar.

Sol-gel process for the production of optical fiber preforms

A sol-gel process is described that allows dry gels to be produced, and where necessary, the corresponding dense vitreous bodies, around an incompressible insert. A particular feature of the process is the step of rotating a container holding the sol and incompressible insert throughout the gelling step under such conditions that a wet gel adhering to the insert is produced, which is then dried. The process is useful particularly for the production of preforms for optical fibers, which are also claimed.

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Sommo, Italy

Fulvio Costa