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Authors acknowledge MINECO/FEDER (RTI2018-098951-B-I00 and RTI2018-101827-B-I00), the Agencia de Gestio d'Ajuts Universitaris i de Recerca (2017SGR359, 2017SGR373, and 2017SGR128), and B. Braun Surgical, S.A., for financial support. Support for the research of C.A. and J.L. are grateful to ICREA Academia program for excellence in research. J.L. is Serra Hunter Fellow. This work is integrated within a wider research project supported by B. Braun Surgical, S.A., UPC, ICS, and ICFO.

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Electrically Polarized Hydroxyapatite: Influence of the Polarization Process on the Microstructure and Properties

Publicat a:Langmuir. 35 (46): 14782-14790 - 2019-11-19 35(46), DOI: 10.1021/acs.langmuir.9b02522

Autors: Sans, J; Llorca, J; Sanz, V; Puiggalí, J; Turon, P; Alemán, C

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Resum

Semipermanently polarized hydroxyapatite, named SP/HAp(w), is obtained by applying a constant dc electric field of 1-10 kV/cm at 300-850 degrees 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 degrees 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 N-2 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 beta-tricalcium phosphate (beta-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 beta-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.

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