Enichem S.p.a

Paolo Chiurlo

Lorenzo Costa

Luigi Balducci

Raffaele Ungarelli

Guido Cogliati

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 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.

Method for preparing optical components and devices in their final or

The present invention relates to a process for the preparation of mixed porous oxides with a spherical morphology and the oxides themselves thus obtained. This process consists in emulsifying, in an acid environment, a mixed sol with a dispersing medium, gelifying the microemulsion thus formed by contact with an alkaline solution and subjecting the gel obtained to thermal aging in the presence of the emulsifying liquid and gelation base of the sol or in a water medium, under controlled conditions of pH and temperature. The above mixed oxides can be widely applied as carriers for catalysts or as precursors of ceramic materials.

Growing community of inventors

Milan, Italy

Paolo Chiurlo