Thermodynamics and Kinetics of Hydroxide Ion Formation in 12CaO·7Al2O3
作者： Katsuro Hayashi , Masahiro Hirano , Hideo Hosono
DOI: 10.1021/JP050807J
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摘要: We have examined the thermodynamics and kinetics of hydroxide (OH-) ions that formed in cages 12CaO·7Al2O3 (C12A7) with nanoporous structures. It is confirmed using thermogravimetric-evolved gas analyses (TG-EGA) hydration C12A7 mediated by a reaction between an oxide (O2-) ion cage H2O molecule atmosphere to form two OH- cages. To simply exactly quantify content from infrared absorption measurements OH-stretching band, we propose method combined thermodynamic analysis, allowing simultaneous determination molar extinction coefficient OH-band, enthalpy, entropy for hydration. Hydration enthalpy extremely high compared other oxides was enhanced marked instability O2- cage. Consequently, solubility retained up unusually temperatures. Furthermore, determined diffusion coefficients species relevant process demonstrated t...
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