Physical-chemical characterization of Si3N4-TiO2 ceramic nanocomposites obtained to biomedical applications
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2019
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BRAZIL MRS MEETING, 18th
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Silicon nitride based ceramics (Si3N4) are very important materials in the
engineering and medical fields because of their physical, chemical, tribological
and mechanical properties. However, some researchs have been carried out in
order to obtain silicon nitride ceramics with improved biological behavior,
including studies about the effect of nanoparticles on their bioactivity. In this
work, Si3N4-TiO2 nanocomposites were synthesized and characterized by their
physical, chemical and bioactive properties. Initially, Si3N4, MgO, SiO2 and CaO
powders were mixed in a ball mill for 24 h The mixture was then dried at 100 ºC
for 1 h under the nitrogen atmosphere. Subsequently, the samples were coated
with TiO2 from the sol-gel process. The precursor solution of titanium dioxide
(TiO2 ) was prepared from the mixture of titanium (IV) isopropoxide and
isopropanol at a ration of 1:10. The pH of the solution was adjusted to 3 by the
addition of sulfuric acid. The precursor solution was dispersed by constant
stirring at 50 ºC for 1 h. The samples were immersed for 10 minutes in this
solution at room temperature and then dried for 24h under UV light. The samples
were calcined at 400 and 500 ºC for 60 min to obtain Si3N4-TiO2 nanocomposites.
The microstructure of the materials were anayzed by scanning electron
microscopy, atomic force microscopy, and X-ray diffraction. The samples
bioactivity was evaluated by in vitro tests using SBF (Simulated Body Fluid)
solution at 37 ºC for 9 days of immersion. The nanocomposites showed good
quality, high uniformit of coating and greater adhesion to TiO2 to the substrate of
Si3N4. The formation of CaP deposits with globular structure on the samples
surface during the SBF experiment is a strong indication of the bioactivity of the
nanocomposites. The results suggest that Si3N4-TiO2 ceramic nanocomposites
have great potential to be used in biomedical applications.
Como referenciar
SONA FILHO, CELSO R.; BENTO, RODRIGO T.; SILVA, CECILIA C.G. e; PILLIS, MARINA F. Physical-chemical characterization of Si3N4-TiO2 ceramic nanocomposites obtained to biomedical applications. In: BRAZIL MRS MEETING, 18th, September 22-26, 2019, Balneário Camburiú, SC. Abstract... São Carlos, SP: Aptor Software, 2019. p. 1051-1051. Disponível em: http://repositorio.ipen.br/handle/123456789/31035. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.