Application of Impedance Spectroscopy to Cement-Based Materials : Hydration of Calcium Phosphate Bone Cements

초록

Impedance spectroscopy was applied to the initial hydration of calcium phosphate bone cements, in order to investigate the electrical/dielectric properties. Hydration or equivalently setting was monitored as a function of amount of water and initial powder characteristics. Higher amount of water produced more open microstructure, leading to higher conductivity and enhanced dielectric constant. Effects of initial characteristics in powder were investigated, using bone cement powder prepared with and without granulation. Granulated powder exhibited significant change in resistance and produced higher dielectric constant than those of conventional powder. Through a simplified modeling, theeffects of thickness in reaction products and pore sizes were estimated by the frequency-dependent impedance measurements. Furthermore, impedance spectroscopy was proven to be a highly reliable tool for evaluating the continuous change in pore structure occurring in calcium phosphate bone cements.

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