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1 Materials Science Poland

1 2008

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Surface microstructure and specific surface area of pure and Na-substituted gyrolite

Baltakys K., Siauciunas R., Kitrys S.

Materials Science Poland

2008

Vol. 26, No. 3

633--645

Pure gyrolite was synthesized within 32 h at 200 °C from a stoichiometric composition (the molar ratio CaO/SiO2 was equal to 0.66 with water/solid ratio of the suspension equal to 10.0) of the initial CaO and SiO2źnH2O mixture. Meanwhile, Na-substituted gyrolite was synthesized twice quicker – within 16 h at 200 °C. These compounds were characterized by XRD, STA, FT-IR, SEM/EDS and BET analysis. It was found that gyrolite is a mesoporous material. Its specific surface area SBET = 143.15 m2/g, the radius of dominant plate pores rp = 80–90 Å, the calculated total pore volume ∑Vp = 0.661 cm3/g. Gyrolite texture changes upon introducing Na+ ions into its crystal structure: the specific surface area SBET diminishes to 27.24 m2/g, the radius of dominant cylindric pores rp = 60–70 Å, the calculated total pore volume #&8721Vp = 0.118 cm3/g.