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- W2127702960 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." @default.
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- W2127702960 date "1994-10-13" @default.
- W2127702960 modified "2023-09-23" @default.
- W2127702960 title "Processing of porous silica gels for optical components" @default.
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- W2127702960 doi "https://doi.org/10.1117/12.189009" @default.
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