| Fabrication and characterization of hydroxyapatite-graphene oxide- chitosan nanocomposite coating on Ti substrate |
| Paper ID : 1306-UFGNSM-FULL |
| Authors: |
|
nasrin karimi *1, Mahshid Kharaziha2, keyvan raeissi3 1jey street- kerdabad.plaque 239
81599-53618 2department of materials science, Isfahan university of technology 3departman of matherial science, isfahan university of technology |
| Abstract: |
| Electrophoretic deposition (EPD) is a facile and feasible technique to prepare functional nanocomposite coatings for orthopedic-related implants. In this work, a ternary graphene oxide–chitosan–hydroxyapatite (GO–CS–HA) composite coating on Ti substrate was successfully fabricated by EPD. While HA is the closest material to bone mineral sector, CS could provide the cohesion of coating. Moreover, graphene was applied to control mechanical strength and biological properties of coating. The coating process was carried out using 1.5 %wt. HA, 0.01%wt. GO and (0.064, 0.128)%wt. CS suspension in 90 % ethanol. The EPD process was conducted under continuous stirring using 30, 40, 45 and 60 V DC power for variable times (5,7.5 and 10 min). The coatings were characterized using scanning electron microscope (SEM), X-ray diffractometer (XRD), energy dispersive X-ray spectrometer (EDS), Fourier Transform Infrared (FTIR) and water contact angle test. Results revealed the well distribution of HA and GO within the CS matrix. Moreover, changing the EPD parameters such as voltage and time could significantly change the properties of the coatings. High voltage (up to 45 V) and time (up to 7.5 min) of EPD resulted in formation of macroscopic cracks in the surface of samples leading to formation of low quality coating. EDS analysis confirmed that HA and GO could uniformly distributed within the CS matrix, specifically at low CS content. Our results confirmed that the optimum voltage and time of EPD were 40 V and 5 min, respectively. |
| Keywords: |
| Electrophoretic deposition, nanocomposite, graphene oxide, chitosan and hydroxyapatite, |
| Status : Paper Accepted (Poster Presentation) |
