A study of the electrophoretic deposition of polycaprolactone-chitosan-bioglass nanocomposite coating on stainless steel (316L) substrates

Abstract

In this research, bioglass nanoparticles were synthesized via sol-gel method and a polycaprolactone-chitosan-bioglass nanocomposite coating was formed on SS316L substrate using electrophoretic deposition method. Then, the effects of voltage and deposition time on morphology, thickness, roughness, and wettability of final coating were investigated. Finally, biocompatibility and toxicity of the coating were evaluated. The results showed that increase of both time and voltage enhanced the thickness, roughness, and wettability of coating. Also, increase of deposition time increased the agglomeration. Therefore, it can be concluded that voltage of 20 V and time of 10 min are suitable for the formation of a uniform agglomerate-free coating. The presence of bioglass nanoparticles also led to the increase of roughness and improvement of polycaprolactone hydrophobicity. The results also showed higher bioactivity in polycaprolactone-chitosan-1% bioglass nanocomposite coating sample. This sample had a roughness ( Ra) of 1.048 ± 0.037 μm and thickness of 2.54 ± 0.14 μm. In summary, the results indicated that coating of polycaprolactone-chitosan-bioglass nanocomposite on SS316L substrate could be a suitable surface treatment to increase its in vivo bioactivity and biocompatibility.

Tailored electrophoretic coatings for enhanced corrosion resistance of 316L stainless steel implants using bioactive glasses

“…28 Likewise, Sadeghinia et al reported that the coating at 20 V for 10 min is the best to achieve a uniform coating. 21 Another work focused on the effect of the variation of the applied voltage between 3 and 50 Volts, with a constant distance between electrodes at 20 mm, to obtain a coating of nitinol (NiTi) alloy with the polyether ether ketone (PEEK)-bioglass (45S5) composite. They found that a voltage of 20 Volts produces a high quality of the PEEK coating in terms of homogeneity and macroscopic uniformity.…”

“…As a result, chitosan, a hydrophilic polymer, is used to replace PCL. 21 Furthermore, chitosan (CS)-bioactive glass composite coatings provide desirable properties for implant applications, 23 The results of Pishbin et al also suggested combining chitosan and bioglass deposition on SS316L substrate in low percentages of bioglass. 24 This study had two main objectives.…”