MOURA, ESPERIDIANALODIS, ALINEREIS, PEDROWELLEN, RENATE2018-12-112018-12-11MOURA, ESPERIDIANA; LODIS, ALINE; REIS, PEDRO; WELLEN, RENATE. Synthesis and characterization of nanocrystalline hydroxyapatite derived from eggshell for biomedical applications. In: AMERICAN CHEMICAL SOCIETY. DIVISION OF CELLULOSE & RENEWABLE MATERIALS. NATIONAL MEETING & EXPOSITION, 255th, March 18-22, 2018, New Orleans, LA. <b>Abstract...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/29357.http://repositorio.ipen.br/handle/123456789/29357Hydroxyapatite(HAP) a crystal-chemical analog of the bone tissue mineral component has been intensively studied in recent years as a potential bone substitute in orthopedic and dentistry because of its biocompatibility, biodegradability, bioactivity, and osteoconductive properties. Hydroxyapatite in a nanocrystalline state with uniform size and morphology has many applications in different fields of medicine ranging from targeted drug delivery to designed load-bearing implants. This work presents the synthesis and characterization of nanocrystalline hydroxyapatite derived from hen’s eggshell waste for biomedical applications. Firstly, bio-hydroxyapatite was synthesized by the wet precipitation method in which white hen’s eggshell waste was used. The white hen`s eggshells were washed, dried and reduced to powder with particle size ≤ 30 μm. Then, the eggshell powder was subjected to a heating cycle at 800 ° C for 3 hours to obtain calcium oxide. Calcium oxide was converted to bio-hydroxyapatite by the addition of a solution of distilled water and phosphoric acid under magnetic stirring at 100 ° C, until a viscous slurry was formed, which was oven dried at 110 ° C for 24 hours. The dried material was disintegrated and calcined at 900 ° C for 2 hours to obtain the hydroxyapatite phase. The bio-hydroxyapatite was irradiated with a high intensity ultrasonic (20 kHz, and 450W/cm2) in order to obtain nanocrystalline hydroxyapatite. These synthesized nanocrystalline hydroxyapatites have been characterized by XRD, FE-SEM, FTIR, and TG analyzes.openAccessResumo de eventos científicosaguardandohttps://orcid.org/0000-0003-3546-1643