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Nanopores in Silica Aerogels

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Šauša O., Iskrová M., Majerník V., Krištiak J., Jesenák K., Vargová M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 5
1517-1522
EN
The size of nanopores in thermally treated samples of silica aerogels was determined by ortho-positronium lifetime measurements at room temperature. The annealing of samples in the temperature region of 300-800°C does not make substantial changes in pore size felt by positronium. The annealing at higher temperatures from an interval of 800-1050°C causes shrinkage of the samples reducing the pore size to 1-15 nm. The macropores vanish at temperature treatment at 1000°C and the positron annihilation is not affected by oxygen from air.
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