Enichem S.p.a

Degussa Novara Technology S.p.a.

Novara Technology S.r.l.

Istituto Guido Donegani

Evonik Degussa Gmbh

Montedipe S.r.l.

Ecir—eco Iniziativa E Realizzazioni—s.r.l.

N Vara Technology S.r.l.

The University of Dublin

Lorenzo Costa

Fulvio Costa

Pier Paolo Costa

Guido Cogliati

Paolo Chiurlo

Giulio Boara

Werner Blau

Stefania Grandi

Vladimir Skarda

Duncan J Westland

Massimo Sparpaglione

Francesco Masi

Renzo Invernizzi

Angelo Moalli

Antonio Carbonaro

Matteo Crepaldi

Pierpaolo Costa

Lucia Gini

Björn Braun

A method is described for the treatment of ferrous nuclear waste, produced in operations of pickling of contaminated metallic surfaces, which makes it possible to minimize the volumes of liquid phases to be treated and to recycle the by-products thereof to the process.

Method for the conditioning of waste coming from decommissioning of nuclear plants

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 sol-gel process that allows to obtain dry gels, and possibly the corresponding dense glassy bodies, having higher dimensions compared to similar known processes.

Sol-gel process for the production of high dimensions dry gels and derived glasses

Glassy articles are prepared by subjecting to hydrolysis and policondensation a solution or suspension of a suitable precursor, mainly comprising a silicon alkoxide, and by drying the obtained gel in a pressure chamber, the gel solvent having been substituted by a non-protic solvent, mainly acetone, under nitrogen flowing, at temperature and pressure conditions lower than the gel solvent critical values. The dried gel is then densified by a thermal treatment.

Sol-gel process for the production of glassy articles

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 allowing preparation, on a substrate, of glassy films of silicon oxide or mixed oxides based on silicon oxide, of thickness above 1 micrometer, generally between 2 and 20 micrometers and characterized by absence of defects, that turn out to be particularly suitable as waveguides in flat optical devices.

Process for preparing silica or silica-based thick vitreous films according to the sol-gel technique and thick films thereby obtained

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.

Sol-gel process for the production of manufactures containing an incompressible insert and manufactures thereby obtained

Sol-gel process for the manufacture of nanocomposite photoluminescent materials

Manufactured articles in silicon oxide and/or other mixed metallic oxides and process for their preparation in &ldquo;final&rdquo; or &ldquo;almost final&rdquo; dimensions

A sol-gel process allowing the preparation, on a substrate, of glassy films of silicon oxide or mixed oxides based on silicon oxide, of thickness above 1 micrometer, generally between 2 and 20 micrometers and characterized by absence of defects, that turn out to be particularly suitable as waveguides in flat optical devices.

A process for producing a linearly-miniaturized, densified optical product, which entails a) cold filling a mould with a liquid colloidal dispersion formed from a chemical precursor; b) polycondensing the liquid colloidal dispersion to obtain a gel; c) supercritically drying the gel to form an amorphous aerogel having dimensions corresponding to the mould; and d) isotropically miniaturizing the amorphous monolithic aerogel obtained.

Process for producing a linearly-miniaturized densified optical article using a mold having an internal volume which is a homothetic copy of the optical article

The preparation of objects, in particular optical components and/or devices, is described using, as precursors of optical materials, amorphous monolithic aerogels for high-precision mechanical machining.

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Sommo, Italy

Lorenzo Costa