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Title of article :
Preparation and in vitro evaluation of porous silica gels
Author/Authors :
Janet Gallardo، نويسنده , , Pablo G. Galliano، نويسنده , , J. M. Porto L?pez، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
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Abstract :
Porous silica gels with high surface areas were prepared from tetraethylothosilicate and polyacrylic acid (PAA) of high molecular weight in acidic media by a sol–gel method. PAA content and ageing temperatures were varied in order to obtain different microstructures. Samples were sintered at temperatures up to 400°C, and subjected to in vitro evaluation by soaking them in acellular inorganic solutions at 37°C and pH 7.3. Surface precipitation of carbonate–apatite on some of the gels was observed by FTIR spectroscopy, scanning electron microscopy and EPMA. Silica dissolution and re-precipitation phenomena were also observed. The relationship between both phenomena during the in vitro test is discussed mainly in terms of structural and microstructural features of the gel.
Keywords :
Sol–gel materials , SiO2 , Porous materials , In vitro tests
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