Interfacial Reaction Between Bioactive Glass and Synthetic Physiological Solution
It has been shown that the reaction of bioglass with synthetic physiological solution at 40°C can be divided into three stages. In the first stage, the weight loss was found to be proportional to the reaction time and to the thickness of the silica-rich layer which formed on the surface of the glass. During the second stage, the weight loss was found to slow down gradually, and the concentration of Na, Ca, Si, and P in the reacted solution increased. Also, at the beginning of the second stage, hydroxyapatite appeared on the silica-rich layer in the crystal phase. In the third stage, the weight of the sample did not change with reaction time, which meant that the system reached equilibrium. The time of each stage depended on the glass composition. These phenomena were satisfactorily explained by the theoretical model of the electric double layer formed between the bioglass and the synthetic physiological solution.
KeywordsElectric Double Layer Glass Composition Physiological Solution Chemical Durability Charge Density Distribution
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