Characterization of Nanohydroxyapatite-Carbon Nanotube on Stainless Steel 316L Produced by Sol-Gel Method

Mohamadi, Pouya | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40400 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Sadeghian, Zahra
  7. Abstract:
  8. In this investigation, hydroxyapatite-carbon nanotube nano composite coatings were applied on the 316L stainless steel implants. After polishing with 1200 sand paper, stainless steel implants were coated via dip coating method. The specimens were heat treated at 350˚C after being coated with HAP and HAP-CNTs composite. In vitro test was done in simulated body fluid (SBF) in 1 to 4 weeks periods. XRD evaluation of powder obtained from sol-gel process, showed the presence of HAP and CNTs in the powders. Comparison of XRD results of HAP and HAP-CNTs powders showed the better crystalinity of composite hydroxyapatite. After in vitro tests, specimens were studied with atomic force microscope (AFM) and scanning electron microscope (SEM). Roughness results of AFM showed the increasing of surface roughness during first days of immersion and decreasing the surface roughness after that period and again increasing the surface roughness. Results from ICP analysis of SBF solution that were done in 3 days periods, showed that the concentration of Ca2+ was increased in first 3 days period that’s in a good agreement with roughness data. Obtained data from surface morphology studies and EDS analysis showed continiues precipitation of hydroxyapatite on the nano structured primitive coating.

  9. Keywords:
  10. Coating ; Carbon Nanotubes ; Nanocomposite ; Sol-Gel Method ; Surface Roughness ; In-Vitro ; Nanohydroxyapatite Coathing

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