RESUMO
A ß-type Ti-based composite, Ti-35Nb-2.5Sn-15-hydroxyapatite (HA), has been synthesized by mechanical alloying and powder metallurgy. The effects of milling time on microstructure, mechanical properties and biocompatibility of the sintered composites were investigated by scanning electronic microscopy (SEM), X-ray diffraction (XRD), microhardness tests, compression tests and cells culture. The results revealed when milling time increased, the homogeneity and relative density of the sintered composite increased, but the finished sintering temperature decreased. The compression Young's modulus of sintered composite from 12 h milled powders was about 22 GPa and its compression strength was 877 MPa. The cell culture results indicated cell viability for these sintered composites was very good. These results revealed the Ti-35Nb-2.5Sn-15HA composite could be useful for medical implants.
Assuntos
Ligas/química , Durapatita/química , Temperatura Alta , Fenômenos Mecânicos , Nióbio/química , Estanho/química , Titânio/química , Células 3T3 , Animais , Materiais Biocompatíveis/química , Materiais Biocompatíveis/toxicidade , Sobrevivência Celular/efeitos dos fármacos , Dureza , Camundongos , Pós , Estresse Mecânico , Fatores de TempoRESUMO
In the present study, silver metal nanofibers have been successfully prepared by using the electrospinning technique. Silver nanofibers have been produced by electrospinning a sol-gel consisting of poly(vinyl alcohol) and silver nitrate. The dried nanofiber mats have been calcined at 850 degrees C in an argon atmosphere. The produced nanofibers do have distinct plasmon resonance compared with the reported silver nanoparticles. Contrary to the introduced shapes of silver nanoparticles, the nanofibers have a blue-shifted plasmon resonance at 330 nm. Moreover, the optical properties study indicated that the synthesized nanofibers have two band gap energies of 0.75 and 2.34 eV. An investigation of the electrical conductivity behavior of the obtained nanofibers shows thermal hystersis. These privileged physical features greatly widen the applications of the prepared nanofibers in various fields.
