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Proceedings Paper

Processing of porous silica gels for optical components
Author(s): Vilma Conceicas Costa; Wander Luiz Vasconcelos; Alessandro Prenazzi
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Paper Abstract

In this work the sol-gel process was used to obtain porous silica gels through acid catalysis of tetramethyl orthosilicate, which was produced from silicon tetrachloride. The influence of the type and concentration of acid catalyst on macroscopic appearance, gelation kinetics, and ultrastructure of the gels was analyzed. The acids employed in this work were nitric, hydrochloric, hydrofluoric, and acetic. The porous gels were infiltrated with a monomer solution of MMA and polymerized. The structural characterization of gels and silica/PMMA composite was carried out in terms of density, specific surface area, pore volume and average pore size. Physical properties such as microhardness, optical transmission and refractive index were evaluated. The structural and physical properties were associated to the different catalysts used. A wide range of gel structures was obtained by changing the volume fraction, average size, and connectivity of pores.

Paper Details

Date Published: 13 October 1994
PDF: 7 pages
Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.189009
Show Author Affiliations
Vilma Conceicas Costa, Univ. Federal de Minas Gerais (United States)
Wander Luiz Vasconcelos, Univ. Federal de Minas Gerais (Brazil)
Alessandro Prenazzi, Univ. Federal de Minas Gerais (Brazil)

Published in SPIE Proceedings Vol. 2288:
Sol-Gel Optics III
John D. Mackenzie, Editor(s)

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