Charge Balance Mechanism of Counter Ion Substitution in Carbonated Apatite
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Durick 2016 Autumn Research Fair presentation.pdf
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Carbonated apatite is present in the bones of vertebrates and has useful biomedical properties. Carbonated apatite is a common form of ion-substituted apatite, but the mechanism employed by the hexagonal structure in the substitution of carbonate for phosphate is still not fully understood. Immediately after substitution, there is an imbalance in charge that requires a charge balancing mechanism to correct. The most promising mechanism appears to involve the co-substitution of a monovalent ion, such as Na+, with CO32-, where the counter ion would replace a calcium ion. In order to investigate the viability of this proposed mechanism, alkali metals were used in different mole ratio amounts for carbonated-apatite synthesis. X-ray diffraction, inductively coupled plasma-atomic absorption, and infrared spectroscopy were used to analyze the samples and determine the degree to which the counter ion affects CO32- incorporation, whether the counter ion is also incorporated, and to what degree. This project was made possible by funding from the Chemistry Department's Dreyfus Scholar program.
Presentation given at the 2016 Autumn Research Fair at Franklin and Marshall College