Physically and chemically bound H2O in the gyrolite structure

• Autorzy: Baltakys K. , Siauciunas R.
• Języki publikacji: EN

Abstrakty

EN

Synthetic pure gyrolite prepared under hydrothermal conditions (32 h, 200 °C) from a stoichiometric composition (CaO/SiO2 = 0.66) of calcium oxide and a fine-grained SiO2onH2O mixture can easily adsorb water vapour. The equilibrium quantity of adsorbed water vapour was estimated from desorption thermograms. It was determined that the thermal effect of desorption is close to the steam-heat of water vapour at temperatures up to 175 °C. This part of water vapour adsorption can be described by a physical adsorption model, only a small quantity of water vapour being chemisorbed. The crystal structure of gyrolite under a pressure of water vapour and at low temperatures (-197 °C) was stable.

Słowa kluczowe

EN

gyrolite; adsorption; thermal analysis; calcium silicate hydrate; X-ray diffraction

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 1
• Strony: 255--263
• Opis fizyczny: Bibliogr. 19 poz.

Twórcy

autor

Baltakys K.

autor

Siauciunas R.

• Department of Silicate Technology, Kaunas University of Technology, Radvilenu 19, LT - 50270 Kaunas, Lithuania

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