Electrically polarized hydroxyapatite: influence of the polarization process on the microstructure and properties

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Document typeArticle
Defense date2019-11-19
Rights accessOpen Access
Abstract
Semipermanently polarized hydroxyapatite, named SP/HAp(w), is obtained by applying a constant dc electric field of 1–10 kV/cm at 300–850 °C to the samples previously sintered in water vapor, while permanently polarized hydroxyapatite, PP/HAp(a), is produced by applying a dc electric field of 3 kV/cm at 1000 °C to the samples sintered in air. SP/HAp(w) has been used for biomedical applications, while PP/HAp(a) has been proved to be a valuable catalyst for N2 and CO2 fixation. In this work, structural differences between SP/HAp(w) and PP/HAp(a) have been ascertained using Raman microscopy, wide-angle X-ray diffraction, scanning electronic microscopy, high-resolution transmission electron microscopy, and grazing incidence X-ray diffraction. Results prove the existence of crystal distortion in the form of amorphous calcium phosphate and ß-tricalcium phosphate (ß-TCP) phases close to the surface because of the atmosphere used in the sintering process. The existence of an amorphous layer in the surface and the phase transition through ß-TCP of SP/HAp(w) are the structural factors responsible for the differences with respect to PP/HAp(a). Moreover, a superstructure has been identified in PP/HAp(a) samples, which could be another structural factor associated with enhanced conductivity, permanent polarization, and catalytic activity of this material
CitationSans, J. [et al.]. Electrically polarized hydroxyapatite: influence of the polarization process on the microstructure and properties. "Langmuir", 19 Novembre 2019, vol. 35, núm. 46, p. 14782-14790.
ISSN0743-7463
Publisher versionhttps://pubs.acs.org/doi/abs/10.1021/acs.langmuir.9b02522
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