INEB
INEB
TitleMorphology and mechanical properties of injectable ceramic microspheres
Publication TypeBook
Year of Publication2009
AuthorsOliveira, SM, Barrias, CC, Ribeiro, CC, Almeida, IF, Bahia, MF, Barbosa, MA
Series TitleKey Engineering MaterialsKey Eng Mat
Volume396-398
Number of Pages691 - 694
ISBN Number10139826 (ISSN)
KeywordsAir streams, Apatite, Calcium, Ceramic microspheres, Co-axial, Coagulation, Compression strengths, Diameter measurements, Gelation, Granulometry, hydroxyapatite, Injectable, Injection process, Ionotropic gelations, Mechanical properties, Microspheres, Morphological structures, Morphology and mechanical properties, Optical microscopes, Powders, SEM, Sintering, Sintering conditions, Sintering process, Sodium, Sodium alginates, Spherical particles, Starting powders, Texture analyzers
AbstractThe aim of this study was to analyze the effect of starting powder granulometry and sintering conditions on the morphological structure and mechanical properties of injectable hydroxyapaptite (HAp) microspheres. The mechanical properties of the microspheres were evaluated, to investigate if their integrity could be maintained during the injection process. To obtain microspheres, HAp powders were dispersed in a sodium alginate solution and spherical particles were prepared by droplet extrusion under a co-axial air stream, coupled with ionotropic gelation in the presence of Ca 2+. This was followed by a sintering process at various temperatures and times. The morphology of microspheres was observed under SEM, diameter measurements were performed in an optical microscope and the compression strength was evaluated using a texture analyzer. Finally, microspheres prepared using lower granulometry HAp powders and sintered at 1200°C for 1 hour presented the best properties and were selected as the most suitable for the envisaged application.
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