Inter-Laboratory Study on Measuring the Surface Charge of Electrically Polarized Hydroxyapatite
Journal of Functional Biomaterials 2023
Dārta Ūbele-Kalniņa, Miho Nakamura, Kārlis-Agris Gross

Surface charges on implants improve integration into bone and so require a clear protocol for achieving a surface charge and comparable results from different laboratories. This study sintered hydroxyapatite (HAp) at one laboratory to remove the influence of the microstructure on surface charge and then polarized/depolarized the pellets at two different laboratories (in Tokyo and Riga). Surface charges on HAp pellets induced by electric polarization at 400 °C in a 5 kV/cm DC electric field were measured by the thermally stimulated depolarization current (TSDC) method as 6–9 µC/cm2. The surface charge results were comparable between laboratories and also agreed with previously documented values. Recommendations describe conditions for polarization and depolarization to generate a surface charge and repeatedly achieve a comparable outcome. A visual display of the polarization mechanisms and the contribution to surface charge point to further aspects that need further development.

electric polarization; thermally stimulated depolarization currents; hydroxyapatite; surface charge

Ūbele-Kalniņa, D., Nakamura, M., Gross, K. Inter-Laboratory Study on Measuring the Surface Charge of Electrically Polarized Hydroxyapatite. Journal of Functional Biomaterials, 2023, Vol. 14, No. 2, Article number 100. e-ISSN 2079-4983. Available from: doi:10.3390/jfb14020100

Publication language
English (en)
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