Abstract
One of the main limitations for applying synthetic hydroxyapatite as a filler in cement and other formulations in orthopedic surgery is its morphology. The present work shows the obtaining of synthetic hydroxyapatite powders at low temperatures such as 300 and 850ºC using the Controlled Rate Thermal Analysis (CRTA) technique. The powders obtained were characterized by IR spectroscopy and X-ray diffraction, showing that the phase formed corresponds to crystalline hydroxyapatite. The specific surface area values determined are between 17 and 66 m2/g with a pore size between 50-300 Å. The transformation of phases in the synthetic hydroxyapatite is studied by Dynamic Thermogravimetric Analysis and CRTA techniques, allowing the kinetic calculations of the transformation using two methods of data processing, determining the activation energy (Ea), pre-exponential factor (A), and model kinetic most likely in each stage. The results show the effectiveness and usefulness of the CRTA technique for preparing synthetic hydroxyapatite powders with different specific surface areas, which makes this technique attractive for medical purposes.
Highlights
Among the various materials currently used as substitutes for bone tissue, synthetic hydroxyapatite (HA) receives special attention for its bone-like properties and excellent biocompatibility
The present study aims to obtain synthetic HA with a controlled specific surface and homogeneous pore distribution, where the Controlled Rate Thermal Analysis (CRTA) technique carries out the crystallization process
The result showed a first stage associated with dehydration, and two other stages corresponding to the dehydration-crystallization process. These processes have been reported by other authors [32, 34,35,36, 38], the influence of experimental conditions on the morphology of the final products achieved by CRTA have not been studied
Summary
Among the various materials currently used as substitutes for bone tissue, synthetic hydroxyapatite (HA) receives special attention for its bone-like properties and excellent biocompatibility. The methods for obtaining HAs ceramics developed to date are varied [6,7,8]. The conventional method of chemical precipitation is the most widespread [9]. The synthesis by hydrothermal process and the combination methods are the most used after chemical precipitation [10,11,12,13,14,15,16]. The scientific community continues to search for alternative methods to obtain hydroxyapatites with better microstructural properties
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